DOE RUN RESOURCES CORP
S-4/A, 1998-08-13
METAL MINING
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<PAGE>
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 13, 1998
    
 
                                                      REGISTRATION NO. 333-52285
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                AMENDMENT NO. 2
                                       TO
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
    
                            ------------------------
 
                       THE DOE RUN RESOURCES CORPORATION
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                                       <C>                                       <C>
                NEW YORK                              1031, 3339, 3341                             13-1255630
    (State or other jurisdiction of             (Primary Standard Industrial                    (I.R.S.Employer
     incorporation or organization)             Classification Code Number)                   Identification No.)
 
                                                 FABRICATED PRODUCTS, INC.
                                   (Exact name of registrant as specified in its charter)
                DELAWARE                           1799, 2819, 3356, 3442                          43-1755268
    (State or other jurisdiction of             (Primary Standard Industrial                    (I.R.S. Employer
     incorporation or organization)             Classification Code Number)                   Identification No.)
 
                                                    DOE RUN CAYMAN LTD.
                                   (Exact name of registrant as specified in its charter)
             CAYMAN ISLANDS                              3331, 3339                                98-0177422
    (State or other jurisdiction of             (Primary Standard Industrial                    (I.R.S. Employer
     incorporation or organization)             Classification Code Number)                   Identification No.)
 
                                                 DOE RUN MINING S.R. LTDA.
                                   (Exact name of registrant as specified in its charter)
                  PERU                                   3331, 3339                                98-0180347
    (State or other jurisdiction of             (Primary Standard Industrial                    (I.R.S. Employer
     incorporation or organization)             Classification Code Number)                   Identification No.)
 
                                                  DOE RUN PERU S.R. LTDA.
                                   (Exact name of registrant as specified in its charter)
                  PERU                                   3331, 3339                                98-0180348
    (State or other jurisdiction of             (Primary Standard Industrial                    (I.R.S. Employer
     incorporation or organization)             Classification Code Number)                   Identification No.)
</TABLE>
 
                         ------------------------------
 
<TABLE>
<S>                                                             <C>
                                                                                       MARVIN K. KAISER
                     1801 PARK 270 DRIVE                                             1801 PARK 270 DRIVE
                  ST. LOUIS, MISSOURI 63146                                       ST. LOUIS, MISSOURI 63146
                        (314) 453-7100                                                  (314) 453-7100
(Address, including zip code, and telephone number, including     (Name, address, including zip code, and telephone number,
   area code, of registrant's principal executive offices)                including area code, of agent for service)
</TABLE>
 
                                   COPIES TO:
 
                             MICHAEL C. RYAN, ESQ.
                         CADWALADER, WICKERSHAM & TAFT
                                100 MAIDEN LANE
                            NEW YORK, NEW YORK 10038
                                 (212) 504-6177
 
                         ------------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
  As soon as practicable after this Registration Statement becomes effective.
 
    If the securities being registered on this Form are to be offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. / /
 
   
                         ------------------------------
    
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SECTION 8(A), MAY
DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
   
                  SUBJECT TO COMPLETION, DATED AUGUST 13, 1998
    
 
PROSPECTUS
 
                                     [LOGO]
OFFER TO EXCHANGE ITS 11 1/4% SENIOR NOTES DUE 2005, SERIES B AND FLOATING
   INTEREST RATE SENIOR NOTES DUE 2003, SERIES B, WHICH HAVE BEEN REGISTERED
      UNDER THE SECURITIES ACT OF 1933, AS AMENDED, FOR ANY AND ALL OF ITS
         OUTSTANDING 11 1/4% SENIOR NOTES DUE 2005, SERIES A AND
            FLOATING INTEREST RATE SENIOR NOTES DUE 2003,
                                  SERIES A, RESPECTIVELY
THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON            ,
                             1998, UNLESS EXTENDED
 
    The Doe Run Resources Corporation, a New York corporation ("Doe Run" and
together with its subsidiaries, the "Company"), hereby offers, upon the terms
and subject to the conditions set forth in this Prospectus and the accompanying
letter of transmittal (the "Letter of Transmittal" and together with this
Prospectus, the "Exchange Offer"), to exchange its 11 1/4% Senior Notes due
2005, Series B (the "Fixed Rate Exchange Notes") and Floating Interest Rate
Senior Notes due 2003, Series B (the "Floating Rate Exchange Notes" and together
with the Fixed Rate Exchange Notes, the "Exchange Notes"), which have been
registered under the Securities Act of 1933, as amended (the "Securities Act"),
pursuant to a Registration Statement (as defined) of which this Prospectus is a
part, for an equal principal amount of its outstanding 11 1/4% Senior Notes due
2005, Series A (the "Fixed Rate Old Notes" and together with the Fixed Rate
Exchange Notes, the "Fixed Rate Notes") and Floating Interest Rate Senior Notes
due 2003, Series A (the "Floating Rate Old Notes" and together with the Fixed
Rate Old Notes, the "Old Notes," and together with the Floating Rate Exchange
Notes, the "Floating Rate Notes"), respectively, of which $200.0 million and
$55.0 million principal amount, respectively, is outstanding. The Exchange Notes
and the Old Notes are collectively referred to herein as the "Notes."
 
    Doe Run will accept for exchange any and all Old Notes that are validly
tendered and not withdrawn on or prior to 5:00 p.m., New York City time, on
           , 1998, unless the Exchange Offer is extended (the "Expiration
Date"). Tenders of Old Notes may be withdrawn at any time prior to 5:00 p.m.,
New York City time, on the Expiration Date. The Exchange Notes will be issued
and delivered promptly after the Expiration Date. The Exchange Offer is not
conditioned upon any minimum principal amount of Old Notes being tendered for
exchange. See "The Exchange Offer." Old Notes may be tendered only in integral
multiples of $1,000. The Company has agreed to pay the expenses of the Exchange
Offer.
 
    The Exchange Notes will be obligations of Doe Run evidencing the same debt
as the Old Notes and will be entitled to the benefits of the same indenture,
dated as of March 12, 1998 (the "Indenture"), by and among Doe Run, as issuer,
and certain of Doe Run's existing subsidiaries, Fabricated Products, Inc., a
Delaware corporation ("FPI"), Doe Run Cayman Ltd., a Cayman Islands company
("Doe Run Cayman"), Doe Run Mining S.R. Ltda., a Peruvian company ("Doe Run
Mining"), and Doe Run Peru S.R. Ltda., a Peruvian company (together with its
predecessors, "Doe Run Peru"), as guarantors (the "Guarantors"), and State
Street Bank and Trust Company, as trustee (the "Trustee"). The form and terms of
the Exchange Notes are substantially the same as the form and terms of the Old
Notes except that the Exchange Notes have been registered under the Securities
Act. See "The Exchange Offer."
 
    The Exchange Notes will bear interest from March 12, 1998. Holders of Old
Notes whose Old Notes are accepted for exchange will be deemed to have waived
the right to receive any payment in respect of interest on the Old Notes accrued
up until the date of the issuance of the Exchange Notes. Such waiver will not
result in the loss of interest income to such holders because the Exchange Notes
will bear interest from the issue date of the Old Notes.
 
    The Fixed Rate Exchange Notes will mature on March 15, 2005. The Floating
Rate Exchange Notes will mature on March 15, 2003. Interest on the Exchange
Notes will be payable semi-annually in arrears on March 15 and September 15 of
each year, commencing on September 15, 1998, at the rate of 11 1/4% per annum in
the case of the Fixed Rate Exchange
 
(COVER CONTINUES ON FOLLOWING PAGE)
                            ------------------------
 
    SEE "RISK FACTORS" BEGINNING ON PAGE 21 FOR A DISCUSSION OF CERTAIN FACTORS
THAT SHOULD BE CONSIDERED IN EVALUATING AN INVESTMENT IN THE EXCHANGE NOTES.
                             ---------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
    EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
       SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
           COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
              PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                                       CRIMINAL OFFENSE.
 
               THE DATE OF THIS PROSPECTUS IS            , 1998.
 
<PAGE>
(CONTINUATION OF COVER)
Notes, and at a rate per annum equal to LIBOR (as defined) plus 6.29%
(currently, 12.00875%) in the case of the Floating Rate Exchange Notes. Interest
on the Floating Rate Exchange Notes will be reset semi-annually. The Fixed Rate
Exchange Notes will be redeemable, in whole or in part, at the option of Doe
Run, on or after March 15, 2002, and the Floating Rate Exchange Notes will be
redeemable, in whole or in part, at the option of Doe Run, at any time, in each
case at the redemption prices set forth herein, plus accrued interest to the
date of redemption. In addition, at any time on or prior to March 15, 2001, Doe
Run may redeem up to 35% of the aggregate principal amount of the Fixed Rate
Exchange Notes with the net cash proceeds of one or more offerings of capital
stock of Doe Run (other than to any subsidiary of Doe Run), at the redemption
price set forth herein, plus accrued interest to the date of redemption,
PROVIDED that at least 65% of the aggregate principal amount of the Fixed Rate
Exchange Notes remains outstanding immediately following such redemption. Upon a
change of control of Doe Run, its direct parent corporation or its ultimate
parent corporation, each holder of Exchange Notes will have the right to require
Doe Run to repurchase such holder's Exchange Notes at a price equal to 101% of
the principal amount thereof, plus accrued and unpaid interest to the repurchase
date. In addition, Doe Run will be obligated to offer to repurchase the Exchange
Notes at 100% of the principal amount thereof plus accrued and unpaid interest
to the date of repurchase in the event of certain asset sales outside the
ordinary course. See "Description of the Notes."
 
   
    The Exchange Notes will be fully and unconditionally guaranteed (the
"Guarantees") by the Guarantors. The Exchange Notes and the Guarantees will be
general unsecured obligations of Doe Run and the Guarantors, respectively, and
will rank senior in right of payment to all existing and future subordinated
indebtedness of Doe Run and the Guarantors, respectively, and equally in right
of payment with other senior indebtedness of Doe Run and the Guarantors,
respectively, subject, in the case of the Guarantees of Doe Run Mining and Doe
Run Peru, to statutorily preferred exceptions and statutorily mandated
priorities based on the date of issuance with respect to payment of obligations
under applicable Peruvian law. However, Doe Run's indebtedness under its new
$100 million revolving credit facility (the "New Doe Run Revolving Credit
Facility") is secured by substantially all of the current assets of Doe Run. In
addition, Doe Run Peru has entered into a new $40.0 million revolving credit
facility (the "New Doe Run Peru Revolving Credit Facility"), which is secured by
substantially all of the current assets of Doe Run Peru. Holders of such secured
indebtedness, and any other secured indebtedness of Doe Run and the Guarantors,
will have claims that effectively rank prior to those of holders of Exchange
Notes with respect to the assets securing such indebtedness. In addition, the
Guarantee of Doe Run Peru will be contractually subordinated to the indebtedness
of Doe Run Peru under the New Doe Run Peru Revolving Credit Facility. As of June
30, 1998, the Company had approximately $397.7 million of indebtedness
outstanding (exclusive of aggregate unused commitments of $129.7 million under
the New Doe Run Revolving Credit Facility and the New Doe Run Peru Revolving
Credit Facility (collectively, the "New Revolving Credit Facilities"), and none
of the Company's indebtedness was subordinated to the Old Notes.
    
 
    Each broker-dealer that receives Exchange Notes for its own account in
exchange for Old Notes, where such Old Notes were acquired by such broker-dealer
as a result of market-making or other trading activities, must acknowledge that
it will deliver a Prospectus in connection with any resale of such Exchange
Notes. The Letter of Transmittal states that, by so acknowledging and by
delivering a Prospectus, a broker-dealer will not be deemed to admit that it is
an "underwriter" within the meaning of the Securities Act. This Prospectus, as
it may be amended or supplemented from time to time, may be used by a
broker-dealer in connection with resales of Exchange Notes received in exchange
for Old Notes where such Old Notes were acquired by such broker-dealer as a
result of market-making or other trading activities. Doe Run has agreed that for
a period of 180 days after consummation of the Exchange Offer, it will make this
Prospectus, which Doe Run will update, amend or supplement from time to time as
required by applicable law or regulations, available to any broker-dealer for
use in connection with any such resale. See "Plan of Distribution."
 
    There has been no public market for the Old Notes. If a market for the
Exchange Notes should develop, the Exchange Notes could trade at a discount from
their principal amount. Doe Run does not intend to list the Exchange Notes on a
national securities exchange or quotation system. There can be no assurance that
an active public market for the Exchange Notes will develop.
 
                                       2
<PAGE>
                             AVAILABLE INFORMATION
 
    Doe Run and the Guarantors have filed with the Securities and Exchange
Commission (the "Commission") a Registration Statement on Form S-4 (together
with all amendments, exhibits, schedules and supplements thereto, the
"Registration Statement") under the Securities Act with respect to the Exchange
Notes offered hereby. This Prospectus, which forms a part of the Registration
Statement, does not contain all the information set forth in the Registration
Statement, certain parts of which have been omitted in accordance with the rules
and regulations of the Commission. For further information with respect to Doe
Run, and the Exchange Notes offered hereby, reference is made to the
Registration Statement. Statements contained in this Prospectus as to the
contents of certain documents filed as exhibits to the Registration Statement
are not necessarily complete and, in each case, are qualified by reference to
the copy of the document so filed. The Registration Statement can be inspected
and copied at the public reference facilities maintained by the Commission at
Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the
Commission's regional offices at 500 West Madison Street, Suite 1400, Chicago,
Illinois 60661 and 7 World Trade Center, 13th Floor, New York, New York 10048.
Copies of such material may be obtained from the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed
rates. Such material also can be reviewed through the Commission's Electronic
Data Gathering, Analysis, and Retrieval System, which is publicly available
through the Commission's web site (http://www.sec.gov).
 
    Doe Run intends to furnish to each holder of the Exchange Notes annual
reports containing audited financial statements and quarterly reports containing
unaudited financial information for the first three quarters of each fiscal
year. Doe Run also will furnish to each holder of the Exchange Notes such other
reports as may be required by applicable law.
 
    The principal executive offices of Doe Run and the Guarantors are located at
1801 Park 270 Drive, Suite 300, St. Louis, Missouri 63146, telephone number:
(314) 453-7100.
 
               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
 
    This Prospectus includes "forward-looking statements." All statements other
than statements of historical facts included in this Prospectus, including
without limitation, certain statements under the captions "Prospectus Summary,"
"Management's Discussion and Analysis of Financial Condition and Results Of
Operations," "Industry" and "Business" and located elsewhere herein regarding
the financial position and business strategy of the Company, may constitute
forward-looking statements. In addition, forward-looking statements generally
can be identified by the use of forward-looking terminology such as "may,"
"will," "expect," "intend," "estimate," "anticipate," "believe" or "continue" or
the negatives thereof or variations thereon or similar terminology. Although the
Company believes that the expectations reflected in such forward-looking
statements are reasonable, it can give no assurance that such expectations will
prove to have been correct. Important factors that could cause actual results to
differ materially from Doe Run's expectations ("Cautionary Statements") are
disclosed in this Prospectus, including, without limitation, in conjunction with
the forward-looking statements included in this Prospectus and under "Risk
Factors." All subsequent written and oral forward-looking statements
attributable to the Company or persons acting on its behalf are expressly
qualified in their entirety by the Cautionary Statements. These forward-looking
statements speak only as of the date of this Prospectus. The Company expressly
disclaims any obligation or undertaking to disseminate any updates or revisions
to any forward-looking statement contained herein to reflect any change in their
expectations with regard thereto or any change in events, conditions or
circumstances on which any such statement is based.
 
                      ENFORCEABILITY OF CIVIL LIABILITIES
 
    Each of Doe Run Peru and Doe Run Mining is organized under the laws of the
Peru. Doe Run Cayman is incorporated under the laws of the Cayman Islands.
Certain experts named herein with respect
 
                                       3
<PAGE>
to Doe Run Peru and Doe Run Mining reside outside of the United States, and
substantially all of the assets of such persons and of Doe Run Peru and Doe Run
Mining are located outside of the United States. As a result, it may not be
possible for investors to effect service of process upon such persons or Doe Run
Peru, Doe Run Cayman and Doe Run Mining or to enforce against them in the United
States, or to realize judgments of courts located outside of the Cayman Islands
or Peru predicated upon civil liability provisions of the federal or state
securities laws of the United States. The Company believes that there are
potential defenses to the enforceability, in original actions in Cayman Islands
or Peruvian courts, of liabilities predicated solely on the U.S. federal and
state securities laws and as to the enforceability in Cayman Islands or Peruvian
courts of judgments of U.S. courts obtained in actions predicated upon the civil
liability provisions of the U.S. federal and state securities laws.
 
                 PRESENTATION OF CERTAIN FINANCIAL INFORMATION
 
    Unless otherwise specified or the context otherwise requires, references to
"$," "US$," "U.S.$," "dollars," and "U.S. dollars" are to United States dollars
and references to "S/.," "nuevo sol" or "nuevos soles" are to Peruvian nuevos
soles. Each nuevo sol is divisible into 100 centimos. See "Exchange Rates."
 
    The financial statements of Empresa Minera del Centro Peru S.A.--Centromin
Peru S.A., La Oroya Division included herein are prepared in U.S. dollars and in
accordance with generally accepted accounting principles in the United States
("U.S. GAAP").
 
    Doe Run Peru and Doe Run Mining maintain their financial records in nuevos
soles, prepare financial information in accordance with generally accepted
accounting principles in Peru ("Peruvian GAAP") and report such information to
the Peruvian government on this basis for purposes of calculating their Peruvian
tax liability. These amounts are calculated on the basis of Peruvian GAAP and,
therefore, cannot be directly derived from the consolidated financial statements
appearing in this Prospectus, which are prepared in accordance with U.S. GAAP.
Peruvian GAAP requires the inclusion in the financial statements of Doe Run Peru
and Doe Run Mining the Resultado de Exposicion a la Inflacion which seeks to
account for the effects of inflation by adjusting the value of non-monetary
assets and liabilities and equity by a factor corresponding to Peruvian
wholesale price inflation rates during the period covered by the financial
statements. Monetary assets and liabilities are not adjusted.
 
                                 EXCHANGE RATES
 
    During the last two decades, the Peruvian government has imposed various
exchange controls ranging from strict control over exchange rates to market
determination of rates. Prior to early 1991, the Peruvian foreign exchange
market consisted of multiple exchange rates. Since early 1991, there have been
no exchange controls in Peru and all foreign exchange transactions are based on
free market exchange rates. Current Peruvian regulations on foreign investment
allow foreign investors to receive and repatriate all earnings and investments
in Peru. Investors are allowed to purchase foreign currency at free market
exchange rates through any member of the Peruvian banking system and transfer
such foreign currency outside Peru without restriction.
 
    Approximately 30.0% of Doe Run Peru's pro forma operating costs, or $115.4
million, for the twelve months ended October 31, 1997, are denominated in nuevos
soles. Because substantially all the revenues of Doe Run Peru are denominated in
U.S. dollars, when inflation in Peru is not offset by a corresponding
devaluation of the nuevo sol versus the U.S. dollar, the financial position,
results of operations and cash flows of Doe Run Peru will be adversely affected.
See "Management's Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources--Inflation and Seasonality." Doe Run
Peru has not in the past entered into any foreign exchange hedging arrangements.
 
                                       4
<PAGE>
    The following table sets forth the high and low month-end, average month-end
and end of period noon buying rates in New York City for customs purposes as set
forth in INTERNATIONAL FINANCIAL STATISTICS published by the International
Monetary Fund of nuevo soles for U.S. dollars for the periods indicated:
 
<TABLE>
<CAPTION>
                                                              MONTH-END
                                                  ---------------------------------   END OF
YEAR ENDED DECEMBER 31,                             HIGH        LOW       AVERAGE     PERIOD
- ------------------------------------------------  ---------  ---------  -----------  ---------
                                                                    (PER $)
<S>                                               <C>        <C>        <C>          <C>
1992............................................   S/.1.468   S/.0.960    S/.1.211    S/.1.468
1993............................................      2.196      1.710       2.008       2.196
1994............................................      2.250      2.160       2.193       2.180
1995............................................      2.320      2.190       2.252       2.310
1996............................................      2.600      2.360       2.460       2.600
1997............................................      2.730      2.640       2.673       2.730
</TABLE>
 
    The noon buying rate in New York City for customs purposes as set forth in
INTERNATIONAL FINANCIAL STATISTICS published by the International Monetary Fund
as of October 31, 1997 and April 30, 1998 was S/.2.720 and S/.2.830,
respectively, per $1.00.
 
    The Company currently does not, and does not intend to, engage in any
hedging or other transactions which are intended to manage risks relating to
foreign currency and interest rate fluctuations.
 
                                       5
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE FOLLOWING SUMMARY IS QUALIFIED IN ITS ENTIRETY BY THE MORE DETAILED
INFORMATION, FINANCIAL STATEMENTS, INCLUDING THE NOTES THERETO, AND OTHER DATA
APPEARING ELSEWHERE IN THIS PROSPECTUS. UNLESS THE CONTEXT OTHERWISE REQUIRES,
AS USED HEREIN: "OUNCE" MEANS A TROY OUNCE (1.09 OUNCES); "TON" MEANS A SHORT
TON (2,000 POUNDS); AND "WESTERN WORLD" MEANS THE ENTIRE WORLD EXCLUDING EASTERN
EUROPE, THE FORMER SOVIET UNION AND CHINA. THE COMPANY'S FISCAL YEAR ENDS
OCTOBER 31, AND THUS, FOR EXAMPLE, "FISCAL 1997" REFERS TO THE FISCAL YEAR ENDED
OCTOBER 31, 1997. PRIOR TO THE ACQUISITION (AS DEFINED), DOE RUN PERU'S FISCAL
YEAR ENDED DECEMBER 31. SEE "UNAUDITED PRO FORMA CONSOLIDATED FINANCIAL DATA"
FOR A DESCRIPTION OF THE TRANSACTIONS GIVEN EFFECT BY, AND THE ASSUMPTIONS
REFLECTED IN, THE FINANCIAL INFORMATION DESIGNATED AS "PRO FORMA" OR "PRO FORMA
AS ADJUSTED." THE COMPANY MAINTAINS ITS PRINCIPAL EXECUTIVE OFFICES AT 1801 PARK
270 DRIVE, ST. LOUIS, MISSOURI 63146, AND ITS TELEPHONE NUMBER IS (314)
453-7100.
 
                                  THE COMPANY
 
    Doe Run is the largest fully-integrated lead producer in North America and
the second largest primary lead producer in the western world. Through its
subsidiary Doe Run Peru, Doe Run operates one of the largest polymetallic
processing facilities in the western world offering an extensive product mix of
non-ferrous and precious metals, including copper, silver, zinc, lead and gold.
The combined capabilities of Doe Run and Doe Run Peru represent the largest
primary lead producer in the western world.
 
    On October 23, 1997, Doe Run Peru acquired (the "Acquisition") Empresa
Metalurgica La Oroya S.A. ("Metaloroya") from Empresa Minera del Centro del Peru
S.A., a Peruvian government-owned conglomerate ("Centromin"), as part of the
ongoing privatization program sponsored by the government of the Republic of
Peru ("Peru"). On December 30, 1997, Metaloroya was merged into Doe Run Peru
(the "Merger").
 
   
    The Company had pro forma net sales, income before extraordinary item and
net income (loss) before extraordinary item plus the sum of net interest
expense, income taxes and depletion, depreciation and amortization ("EBITDA") of
$709.8 million, $3.7 million and $77.4 million, respectively, for the twelve
months ended October 31, 1997 and pro forma net sales, loss before extraordinary
item and EBITDA of $343.4 million, $5.6 million and $40.4 million, respectively,
for the six months ended April 30, 1998.
    
 
DOE RUN
 
    Doe Run's integrated operations permit Doe Run to participate in and manage
the entire lead life cycle, including the mining of lead ore, the production of
refined lead metal, the fabrication of value-added lead products and the
secondary recycling of spent lead-acid batteries and other lead-bearing
materials. Doe Run believes its reputation for excellent service, product
quality and timely delivery permits it to consistently realize premiums for its
products, resulting in sales prices above the market price for lead quoted on
the London Metal Exchange (the "LME").
 
    In fiscal 1997, Doe Run shipped approximately 350,000 tons of refined lead
metal and lead alloy products, including recycled lead, representing
approximately 18% of North American consumption and 6% of western world
consumption. Doe Run had net sales, net loss and EBITDA of $277.9 million, $1.1
million and $31.9 million, respectively, for fiscal 1997, excluding the results
of operations of Doe Run Peru for the eight-day period from October 23, 1997
(the date of consummation of the Acquisition) through October 31, 1997 and net
sales, net loss and EBITDA (excluding intercompany transactions) of $118.5
million, $14.2 million and $4.2 million, respectively, for the six months ended
April 30, 1998.
 
    Refined lead product sales accounted for approximately 67% and 68% of Doe
Run's total net sales, or $185.1 million and $80.6 million, respectively, in
fiscal 1997 and for the six months ended April 30, 1998, respectively. The
balance of Doe Run's net sales resulted from (i) tolling services provided to
major U.S. lead-acid battery manufacturers, (ii) lead production by-products,
including zinc and copper concentrates, and (iii) value-added fabricated lead
products, such as lead sheet and bricks. These net sales from tolling services,
by-products and fabricated products provide sources of revenue largely
independent of lead prices.
 
                                       6
<PAGE>
    Western world lead consumption in 1997 was estimated at 5.8 million tons
which represents a total market of approximately $3.2 billion. Approximately 4.2
million tons, or 72%, of this lead was used in the production of lead-acid
batteries, approximately 75% of which was for starting-lighting-ignition ("SLI")
batteries. Approximately 77% of SLI battery sales are in the automotive
replacement market, a market with stable demand characteristics, which is
dependent upon the number of automobiles in service and battery life.
 
    The lead-acid battery remains the most cost competitive battery technology
for SLI batteries, which management believes will not change in the foreseeable
future. Other uses for refined lead include computer and television screens,
ammunition, stationary batteries used as backup power sources and rolled and
extruded lead products used in radiation shielding and roofing materials.
 
    The market for refined lead continues to grow primarily as a result of
increasing demand for lead-acid batteries used for automobiles and other
vehicles as a result of worldwide economic growth. As a result, western world
lead consumption grew at a compound annual growth rate ("CAGR") of 2.0% between
1987 and 1997. Doe Run believes that this growth rate will accelerate in the
future as batteries become an even larger portion of the lead market,
particularly in light of expected economic growth leading to increased vehicle
population in developing economies.
 
    Approximately 45% of annual western world lead consumption is supplied from
newly mined or "primary" ore, and the balance is supplied from secondary
sources, principally the recycling of spent lead-acid batteries and other
lead-bearing materials. Since 1990, primarily due to heightened environmental
awareness, secondary lead capacity has increased, whereas primary lead capacity
has remained relatively constant. Management believes that secondary sources of
lead will continue to account for an increasing share of the total worldwide
lead market.
 
    The average LME price for refined lead was $.29 per pound in fiscal 1997. As
of June 30, 1998, the LME price for lead was $.25 per pound, which was below the
ten-year average price of $.28 per pound. Management believes that lead prices
will remain relatively stable or will modestly increase for the remainder of
fiscal 1998 and over the long term will reflect the historical industry average.
As a result of the recent lead price decreases, the Company expects that it will
incur an operating loss in its U.S. operations that will adversely affect its
EBITDA in fiscal 1998.
 
    Doe Run conducts its mining operations along approximately 40 miles of the
Viburnum Trend in Southeastern Missouri, one of the world's most productive lead
deposits. Doe Run operates six production shafts, four processing mills one
primary smelter and one secondary smelter. During fiscal 1997, Doe Run mined in
excess of 5.0 million tons of ore containing average grades of 5.17% lead, 1.02%
zinc and 0.27% copper. At the end of fiscal 1997, Doe Run's proven and probable
reserves consisted of approximately 70 million tons, containing approximately
3.8 million tons of recoverable lead or approximately fourteen years of
production at current mining rates.
 
    Doe Run's primary smelter in Herculaneum, Missouri is the largest in North
America and the second largest in the world, with an annual production capacity
of approximately 250,000 tons of refined lead. Since entering the recycling
business in 1992, Doe Run has become a leading producer of secondary lead at its
Buick recycling facility and secondary smelter located in Boss, Missouri. At
this facility, Doe Run is reclaiming at a rate of approximately 105,000 tons of
refined lead per year, approximately 60% of which is derived from tolling
arrangements with major U.S. battery manufacturers.
 
DOE RUN PERU
 
    Doe Run Peru's unique combination of base metal smelters, refineries and
by-product circuits enable Doe Run Peru to process complex polymetallic
concentrates and to recover base metals and by-products at international quality
standards. Doe Run Peru's location in central Peru, approximately 110 miles from
Lima, allows Doe Run Peru to source concentrates advantageously from mines
located throughout the central Andes mountains, particularly in Peru. Moreover,
Doe Run Peru's proximity to Lima's Callao port provides it ready access to major
world markets for its products.
 
                                       7
<PAGE>
    For the twelve months ended October 31, 1997 and the six months ended April
30, 1998, Doe Run Peru shipped approximately 70,000 tons and 35,000 tons,
respectively, of refined copper, 107,000 tons and 55,000 tons, respectively, of
refined lead, 71,000 tons and 40,000 tons, respectively, of refined zinc, 20.5
million ounces and 13.0 million ounces, respectively, of refined silver and
42,000 ounces and 26,000 ounces, respectively, of gold bullion. In addition, Doe
Run Peru shipped various by-products including bismuth, indium, tellurium,
antimony, cadmium and copper blister. Doe Run Peru had net sales, net income and
EBITDA adjusted for certain non-recurring charges ("Adjusted EBITDA") of $431.9
million, $26.4 million and $50.7 million, respectively, for the twelve months
ended October 31, 1997, including the period from October 23, 1997 through
October 31, 1997, and net sales, net income and EBITDA (excluding intercompany
transactions) of $224.9 million, $18.9 million and $36.2 million, respectively,
for the six months ended April 30, 1998.
 
    Of Doe Run Peru's net sales, refined copper, silver, zinc, lead and gold
accounted for 35%, 23%, 19%, 15% and 3%, respectively, for the twelve months
ended October 31, 1997, and 25%, 34%, 17%, 13% and 4%, respectively, for the six
months ended April 30, 1998, with the balance of net sales derived from sales of
various by-products. For the twelve months ended December 31, 1997, Doe Run Peru
was one of Peru's largest exporters, exporting approximately 80% of its total
shipments to North America, Europe and Asia, as well as other Latin American
countries. Doe Run Peru's customers include end-users of base metals and metal
by-products, as well as international metal trading companies.
 
    Doe Run Peru's operations consist of smelting and refining complex
concentrates that it purchases from unaffiliated mining operations. Doe Run Peru
typically purchases concentrate feedstock pursuant to annual contracts at a
price based on a percentage of the payable base metal and precious metal content
of the concentrates. The price is reduced by processing fees or treatment
charges to refine the concentrates, as well as by penalties charged to remove
impurities within the concentrates, such as arsenic, antimony and bismuth. Base
metal prices, treatment charges and penalties are generally established based
upon prevailing market conditions by reference to prices in the world market,
including on the LME. Currently, Doe Run Peru has entered into supply contracts,
primarily with one-year terms, that meet approximately 95% of its concentrate
requirements for fiscal 1998.
 
    Doe Run Peru pays concentrate suppliers for the majority of the metal
content of the concentrates purchased and, thus, derives its operating profit
primarily from treatment charges and penalties. In addition, Doe Run Peru
generates operating profit from the sale of by-products, as well as from metals
sold at a premium to the price paid for such metal. Moreover, since Doe Run
Peru's metallurgical recoveries are typically in excess of the paid metal
percentages, Doe Run Peru further increases its operating profit from the sale
of the metal produced from such recoveries.
 
    The markets for Doe Run Peru's products are global and continue to grow as a
result of worldwide economic growth. Given the diversity of its products and
by-products, Doe Run Peru's financial performance is not solely dependent upon
the prospects for any one of its products or by-products. Moreover, since Doe
Run Peru is a processor of complex concentrates and does not presently own any
mines from which it sources concentrates, Doe Run Peru's financial performance
is less sensitive to the volatility of base metal prices.
 
                             CONTROL OF THE COMPANY
 
    All of Doe Run's issued and outstanding capital stock is owned indirectly by
Renco. In excess of 99% of the interests in Doe Run Peru is indirectly owned by
Doe Run through Doe Run Cayman and Doe Run Mining (with a DE MINIMIS number of
shares owned by employees of Doe Run Peru and Centromin pursuant to Peruvian
law).
 
                                       8
<PAGE>
    The following chart sets forth the corporate structure of Doe Run and the
Guarantors.
 
                [GRAPHIC REPRESENTATION OF CORPORATE STRUCTURE]
 
    Renco is 97.9% owned by Mr. Ira Leon Rennert, the Chairman of Doe Run and
Chairman and Chief Executive Officer of Renco, and by trusts established for
himself and members of his family (but of which he is not a trustee). As a
result of such ownership, Mr. Rennert controls the Company.
 
                                       9
<PAGE>
                               THE EXCHANGE OFFER
 
<TABLE>
<S>                                   <C>
The Exchange Offer..................  $1,000 principal amount of Fixed Rate Exchange Notes
                                      and Floating Rate Exchange Notes will be issued in
                                      exchange for each $1,000 principal amount of Fixed
                                      Rate Old Notes and Floating Rate Old Notes,
                                      respectively, validly tendered pursuant to the
                                      Exchange Offer. As of the date hereof, $200.0 million
                                      and $55.0 million in aggregate principal amount of
                                      Fixed Rate Old Notes and Floating Rate Old Notes,
                                      respectively, are outstanding. Doe Run will issue the
                                      Exchange Notes to tendering holders of Old Notes
                                      promptly after the Expiration Date.
 
Resales.............................  Based on an interpretation by the staff of the
                                      Commission set forth in Morgan Stanley & Co.
                                      Incorporated, SEC No-Action Letter (available June 5,
                                      1991) (the "Morgan Stanley Letter"), Exxon Capital
                                      Holdings Corporation, SEC No-Action Letter (available
                                      May 13, 1988) (the "Exxon Capital Letter") and
                                      similar letters, Doe Run believes that Exchange Notes
                                      issued pursuant to the Exchange Offer in exchange for
                                      Old Notes may be offered for resale, resold and
                                      otherwise transferred by any person receiving such
                                      Exchange Notes, whether or not such person is the
                                      holder (other than any such holder or other person
                                      which is (i) a broker-dealer that receives Exchange
                                      Notes for its own account in exchange for Old Notes,
                                      where such Old Notes were acquired by such
                                      broker-dealer as a result of market-making or other
                                      trading activities, or (ii) an "affiliate" of Doe Run
                                      within the meaning of Rule 405 under the Securities
                                      Act (collectively, "Restricted Holders")) without
                                      compliance with the registration and prospectus
                                      delivery provisions of the Securities Act, provided
                                      that (a) such Exchange Notes are acquired in the
                                      ordinary course of business of such holder or other
                                      person (b) neither such holder nor such other person
                                      is engaged in or intends to engage in a distribution
                                      of such Exchange Notes and (c) neither such holder
                                      nor other person has any arrangement or understanding
                                      with any person to participate in the distribution of
                                      such Exchange Notes. If any person were to be
                                      participating in the Exchange Offer for the purposes
                                      of participating in a distribution of the Exchange
                                      Notes in a manner not permitted by the Commission's
                                      interpretation, such person (a) could not rely upon
                                      the Morgan Stanley Letter, the Exxon Capital Letter
                                      or similar letters and (b) must comply with the
                                      registration and prospectus delivery requirements of
                                      the Securities Act in connection with a secondary
                                      resale transaction. Each broker or dealer that
                                      receives Exchange Notes for its own account in
                                      exchange for Old Notes, where such Old Notes were
                                      acquired by such broker or dealer as a result of
                                      market-making or other activities, must acknowledge
                                      that it will deliver a Prospectus in connection with
                                      any sale of such Exchange Notes. See "Plan of
                                      Distribution."
</TABLE>
 
                                       10
<PAGE>
 
<TABLE>
<S>                                   <C>
Expiration Date.....................  5:00 p.m., New York City time, on            , 1998,
                                      unless the Exchange Offer is extended, in which case
                                      the term "Expiration Date" means the latest date and
                                      time to which the Exchange Offer is extended.
 
Accrued Interest on the Exchange
  Notes and Old Notes...............  The Exchange Notes will bear interest from March 12,
                                      1998. Holders of Old Notes whose Old Notes are
                                      accepted for exchange will be deemed to have waived
                                      the right to receive any payment in respect of
                                      interest on such Old Notes accrued to the date of
                                      issuance of the Exchange Notes.
 
Conditions to the Exchange Offer....  The Exchange Offer is subject to certain customary
                                      conditions. The conditions are limited and relate in
                                      general to proceedings which have been instituted or
                                      laws which have been adopted that might impair the
                                      ability of Doe Run to proceed with the Exchange
                                      Offer. As of the date of this Prospectus, none of
                                      these events had occurred, and Doe Run believes their
                                      occurrence to be unlikely. If any such conditions
                                      exist prior to the Expiration Date, Doe Run may (a)
                                      refuse to accept any Old Notes and return all
                                      previously tendered Old Notes, (b) extend the
                                      Exchange Offer or (c) waive such conditions. See "The
                                      Exchange Offer-- Conditions."
 
Procedures for Tendering Old
  Notes.............................  Each holder of Old Notes wishing to accept the
                                      Exchange Offer must complete, sign and date the
                                      Letter of Transmittal, or a facsimile thereof, in
                                      accordance with the instructions contained herein and
                                      therein, and mail or otherwise deliver such Letter of
                                      Transmittal, or such facsimile, together with the Old
                                      Notes to be exchanged and any other required
                                      documentation to State Street Bank and Trust Company,
                                      as exchange agent ("the Exchange Agent"), at the
                                      address set forth herein and therein. Tendered Old
                                      Notes, the Letter of Transmittal and accompanying
                                      documents must be received by the Exchange Agent by
                                      5:00 p.m. New York City time, on the Expiration Date.
                                      See "The Exchange Offer--Procedures for Tendering."
                                      By executing the Letter of Transmittal, each holder
                                      will represent to Doe Run that, among other things,
                                      the Exchange Notes acquired pursuant to the Exchange
                                      Offer are being obtained in the ordinary course of
                                      business of the person receiving such Exchange Notes,
                                      whether or not such person is the holder, that
                                      neither the holder nor any such other person is
                                      engaged in or intends to engage in a distribution of
                                      the Exchange Notes or has an arrangement or
                                      understanding with any person to participate in the
                                      distribution of such Exchange Notes, and that neither
                                      the holder nor any such other person is an
                                      "affiliate," as defined under Rule 405 of the
                                      Securities Act, of Doe Run.
 
Special Procedures for Beneficial
  Holders...........................  Any beneficial holder whose Old Notes are registered
                                      in the name of his broker, dealer, commercial bank,
                                      trust company
</TABLE>
 
                                       11
<PAGE>
 
<TABLE>
<S>                                   <C>
                                      or other nominee and who wishes to tender in the
                                      Exchange Offer should contact such registered holder
                                      promptly and instruct such registered holder to
                                      tender on his behalf. If such beneficial holder
                                      wishes to tender on his own behalf, such beneficial
                                      holder must, prior to completing and executing the
                                      Letter of Transmittal and delivering his Old Notes,
                                      either make appropriate arrangements to register
                                      ownership of the Old Notes in such holder's name or
                                      obtain a properly completed bond power from the
                                      registered holder. The transfer of record ownership
                                      may take considerable time. See "The Exchange
                                      Offer--Procedures for Tendering."
 
Guaranteed Delivery Procedures......  Holders of Old Notes who wish to tender their Old
                                      Notes and whose Old Notes are not immediately
                                      available or who cannot deliver their Old Notes and a
                                      properly completed Letter of Transmittal or any other
                                      documents required by the Letter of Transmittal to
                                      the Exchange Agent prior to the Expiration Date may
                                      tender their Old Notes according to the guaranteed
                                      delivery procedures set forth in "The Exchange
                                      Offer--Guaranteed Delivery Procedures."
 
Withdrawal Rights...................  Tenders may be withdrawn at any time prior to 5:00
                                      p.m., New York City time, on the Expiration Date.
 
Acceptance of Old Notes and Delivery
  of Exchange Notes.................  Subject to certain conditions, Doe Run will accept
                                      for exchange any and all Old Notes which are properly
                                      tendered in the Exchange Offer prior to 5:00 p.m.,
                                      New York City time, on the Expiration Date. The
                                      Exchange Notes issued pursuant to the Exchange Offer
                                      will be delivered promptly after the Expiration Date.
                                      See "The Exchange Offer--Terms of the Exchange
                                      Offer."
 
Certain U.S. Federal Income Tax
  Considerations....................  The exchange of Old Notes for Exchange Notes pursuant
                                      to the Exchange Offer will not be a taxable event for
                                      federal income tax purposes. A holder's holding
                                      period for Exchange Notes will include the holding
                                      period for Old Notes. For a discussion summarizing
                                      certain U.S. federal income tax consequences to
                                      holders of the Exchange Notes, see "Certain U.S.
                                      Federal Income Tax Considerations."
 
Exchange Agent......................  State Street Bank and Trust Company is serving as
                                      Exchange Agent in connection with the Exchange Offer.
                                      The mailing address of the Exchange Agent is State
                                      Street Bank and Trust Company, Two International
                                      Place, 4th Floor, Boston, Massachusetts 02110,
                                      Attention: Claire Young--Corporate Trust Department.
                                      Deliveries by hand or overnight courier should be
                                      addressed to State Street Bank and Trust Company, 61
                                      Broadway, 15th Floor, New York, New York 10016,
                                      Attention: Corporate Trust Department. For
                                      information with respect to the Exchange Offer, call
                                      the Exchange Agent at telephone number: (860)
                                      244-1846 or facsimile number: (860) 244-1881.
</TABLE>
 
                                       12
<PAGE>
                       SUMMARY OF TERMS OF EXCHANGE NOTES
 
    The Exchange Offer constitutes an offer to exchange up to $200.0 million and
$55.0 million aggregate principal amount of the Fixed Rate Exchange Notes and
Floating Rate Exchange Notes, respectively, for up to an equal aggregate
principal amount of Fixed Rate Old Notes and Floating Rate Old Notes,
respectively. The Exchange Notes will be obligations of Doe Run evidencing the
same indebtedness as the Old Notes, and will be entitled to the benefit of the
same Indenture. The form and terms of the Fixed Rate Exchange Notes and Floating
Rate Exchange Notes are substantially the same as the form and terms of the
Fixed Rate Old Notes and Floating Rate Old Notes, respectively, except that the
Exchange Notes have been registered under the Securities Act. See "Description
of the Notes."
 
COMPARISON WITH OLD NOTES
 
<TABLE>
<S>                                   <C>
Freely Transferable.................  The Exchange Notes will be freely transferable under
                                      the Securities Act by holders who are not Restricted
                                      Holders. Restricted Holders are restricted from
                                      transferring the Exchange Notes without compliance
                                      with the registration and prospectus delivery
                                      requirements of the Securities Act. The Fixed Rate
                                      Exchange Notes and Floating Rate Exchange Notes will
                                      be identical in all material respects (including
                                      interest rate, maturity and restrictive covenants) to
                                      the Fixed Rate Old Notes and Floating Rate Old Notes,
                                      respectively, with the exception that the Exchange
                                      Notes will be registered under the Securities Act.
                                      See "The Exchange Offer--Terms of the Exchange
                                      Offer."
 
Registration Rights.................  The holders of Old Notes currently are entitled to
                                      certain registration rights pursuant to the
                                      Registration Rights Agreement, dated as of March 12,
                                      1998 (the "Registration Rights Agreement"), by and
                                      among Doe Run, the Guarantors and BT Alex. Brown
                                      Incorporated, Donaldson, Lufkin & Jenrette Securities
                                      Corporation and UBS Securities LLC, the initial
                                      purchasers of the Old Notes (the "Initial
                                      Purchasers"), including the right to cause Doe Run
                                      and the Guarantors to register the Old Notes under
                                      the Securities Act if the Exchange Offer is not
                                      consummated prior to the date on which the earliest
                                      of the following events occurs: (a) any change in law
                                      or in currently prevailing interpretations of the
                                      staff of the Commission do not permit Doe Run and the
                                      Guarantors to effect the Exchange Offer, (b) the
                                      Exchange Offer is not consummated within 180 days of
                                      March 12, 1988, the date the Old Notes were issued
                                      (the "Issue Date"), or (c) any holder of Old Notes
                                      that participates in the Exchange Offer does not
                                      receive freely transferable Exchange Notes and so
                                      notifies Doe Run and the Guarantors within 30 days
                                      after such holder first becomes aware of such
                                      condition (the "Exchange Offer Termination Date").
                                      See "The Exchange Offer--Conditions." However,
                                      pursuant to the Registration Rights Agreement, such
                                      registration rights will expire upon consummation of
                                      the Exchange Offer. Accordingly, holders of Old Notes
                                      who do not exchange their Old Notes for Exchange
                                      Notes in the Exchange Offer will not be able to
</TABLE>
 
                                       13
<PAGE>
 
   
<TABLE>
<S>                                   <C>
                                      reoffer, resell or otherwise dispose of their Old
                                      Notes unless such Old Notes are subsequently
                                      registered under the Securities Act or unless an
                                      exemption from the registration requirements of the
                                      Securities Act is available.
 
TERMS OF THE EXCHANGE NOTES
 
Securities Offered..................  $200.0 million aggregate principal amount of 11 1/4%
                                      Senior Notes due 2005, Series B.
 
                                      $55.0 million aggregate principal amount of Floating
                                      Interest Rate Senior Notes due 2003, Series B.
 
Issuer..............................  The Doe Run Resources Corporation
 
Guarantors..........................  Fabricated Products, Inc., Doe Run Cayman Ltd., Doe
                                      Run Mining S.R. Ltda. and Doe Run Peru S.R. Ltda.
 
Maturity Date.......................  The Floating Rate Exchange Notes will mature on March
                                      15, 2003, and the Fixed Rate Exchange Notes will
                                      mature on March 15, 2005.
 
Interest Payment Dates..............  Interest on the Exchange Notes will be payable
                                      semi-annually on each March 15 and September 15,
                                      commencing September 15, 1998. The Fixed Rate
                                      Exchange Notes will bear interest at a rate of
                                      11 1/4% per annum. The Floating Rate Exchange Notes
                                      will bear interest at a rate per annum equal to LIBOR
                                      plus 6.29% (currently, 12.00875%). Interest on the
                                      Floating Rate Exchange Notes will be reset semi-
                                      annually.
 
Ranking.............................  The Exchange Notes and the Guarantees will be general
                                      unsecured obligations of Doe Run and of the
                                      Guarantors, respectively, and will rank senior in
                                      right of payment to all existing and future
                                      subordinated indebtedness of Doe Run and the
                                      Guarantors, respectively, and equally in right of
                                      payment with other senior indebtedness of Doe Run and
                                      the Guarantors, respectively, subject, in the case of
                                      the Guarantees of Doe Run Mining and Doe Run Peru, to
                                      statutorily preferred exceptions and statutorily
                                      mandated priorities based on the date of issuance
                                      with respect to payment of obligations under
                                      applicable Peruvian law. However, Doe Run's
                                      indebtedness under the New Doe Run Revolving Credit
                                      Facility is secured by substantially all of the
                                      current assets of Doe Run. In addition, Doe Run Peru
                                      has entered into the New Doe Run Peru Revolving
                                      Credit Facility, which is secured by substantially
                                      all of the current assets of Doe Run Peru. Holders of
                                      such secured indebtedness, and any other secured
                                      indebtedness of Doe Run and the Guarantors, will have
                                      claims that effectively rank prior to those of
                                      holders of Exchange Notes with respect to the assets
                                      securing such indebtedness. In addition, the
                                      Guarantee of Doe Run Peru will be contractually
                                      subordinated to the indebtedness of Doe Run Peru
                                      under the New Doe Run Peru Revolving Credit Facility.
                                      As of June 30, 1998, the Company had approximately
                                      $397.7 million of
</TABLE>
    
 
                                       14
<PAGE>
 
<TABLE>
<S>                                   <C>
                                      indebtedness outstanding (including the Back-to-Back
                                      Loan of $125.0 million but exclusive of aggregate
                                      unused commitments of $129.7 million under the New
                                      Revolving Credit Facilities), and none of the
                                      Company's indebtedness was subordinated to the Old
                                      Notes.
 
Optional Redemption.................  The Fixed Rate Exchange Notes will be redeemable, in
                                      whole or in part, at the option of Doe Run, on or
                                      after March 15, 2002, and the Floating Rate Exchange
                                      Notes will be redeemable, in whole or in part, at the
                                      option of Doe Run, at any time, in each case at the
                                      redemption prices set forth herein, plus accrued and
                                      unpaid interest to the date of redemption. In
                                      addition, at any time on or prior to March 15, 2001,
                                      Doe Run may redeem up to 35% of the aggregate
                                      principal amount of the Fixed Rate Exchange Notes
                                      with the net cash proceeds of one or more offerings
                                      of capital stock of Doe Run (other than to any
                                      subsidiary of Doe Run), at a redemption price equal
                                      to 111.25% of the principal amount thereof, plus
                                      accrued interest to the date of redemption; PROVIDED
                                      that at least 65% of the aggregate principal amount
                                      of Fixed Rate Notes remains outstanding immediately
                                      after any redemption. See "Description of the Notes--
                                      Redemption."
 
Change of Control...................  Upon a change of control of Doe Run, its direct
                                      parent corporation or its ultimate parent
                                      corporation, each holder of Exchange Notes will have
                                      the right to require Doe Run to repurchase such
                                      holder's Exchange Notes at a price equal to 101% of
                                      the principal amount thereof, plus accrued and unpaid
                                      interest to the date of repurchase. See "Description
                                      of the Notes--Certain Covenants--Change of Control."
 
Certain Covenants...................  The Indenture contains certain covenants that limit
                                      the ability of Doe Run and its Restricted
                                      Subsidiaries (as defined) to, among other things,
                                      incur additional indebtedness, pay dividends or make
                                      certain other restricted payments, consummate certain
                                      asset sales, enter into certain transactions with
                                      affiliates, incur liens, impose restrictions on the
                                      ability of a subsidiary to pay dividends or make
                                      certain payments to Doe Run and its Restricted
                                      Subsidiaries, merge or consolidate with any other
                                      person or sell, assign, transfer, lease, convey or
                                      otherwise dispose of all or substantially all of the
                                      assets of Doe Run and its Restricted Subsidiaries.
                                      These restrictions and qualifications are subject to
                                      a number of important qualifications and exceptions.
                                      See "Description of the Notes--Certain Covenants."
</TABLE>
 
    For additional information regarding the Exchange Notes, see "Description of
the Notes."
 
                                       15
<PAGE>
                                USE OF PROCEEDS
 
    Doe Run will not receive any proceeds from the Exchange Offer. See "Use of
Proceeds." Doe Run has agreed to bear the expenses of the Exchange Offer
pursuant to the Registration Rights Agreement. No underwriter is being used in
connection with the Exchange Offer.
 
    See "--Recent Transactions and Events--Old Notes Offering" for a description
of the use of proceeds from the Old Notes Offering.
 
                         RECENT TRANSACTIONS AND EVENTS
 
THE ACQUISITION
 
    Doe Run Peru consummated the Acquisition on October 23, 1997 pursuant to the
terms of the Contract of Stock Transfer, Capital Increase and Stock Subscription
(the "Subscription Agreement") whereby Doe Run Peru acquired in excess of 99.97%
of Metaloroya's shares for approximately $247.0 million, which consisted of a
capital contribution to Metaloroya of $126.5 million and a purchase price
payment of $120.5 million. The Acquisition was structured as a direct
subscription and payment for newly issued shares of Metaloroya representing a
51% ownership interest in Metaloroya and a contemporaneous purchase from
Centromin of substantially all the previously outstanding shares, except for a
DE MINIMIS number of shares purchased from Centromin pursuant to Peruvian law by
employees of Centromin.
 
    In order to finance the Acquisition, Doe Run Mining borrowed $225.0 million
in term loans under the Credit Agreement, dated as of October 23, 1997 (the
"Existing Doe Run Mining Credit Facility," which was repaid in full with the
proceeds of the Old Notes Offering (as defined) and thereupon terminated), among
Doe Run Mining, as borrower, Doe Run, Doe Run Cayman, Doe Run Peru and
Metaloroya, each as guarantors, and various financial institutions. In addition,
Doe Run Mining received a $2.0 million capital contribution from Doe Run Cayman
and a $23.0 million subordinated loan from Doe Run (the "Subordinated Loan").
Doe Run Mining used the foregoing funds to make a capital contribution to Doe
Run Peru of approximately $248.0 million which was used to complete the
Acquisition and for general corporate purposes. On December 30, 1997, the Merger
of Metaloroya into Doe Run Peru was consummated with the surviving company being
named Doe Run Peru S.R. Ltda.
 
    As part of the Subscription Agreement, Doe Run Peru is obligated to invest
$120.0 million through October 23, 2002 (the "Investment Commitment") to expand
and modernize Doe Run Peru's operations, including certain expenditures to
comply with environmental regulations within Peru as set forth in the Programa
de Adecuacion y Manejo Ambiental (Environmental Remedy and Management Program)
(the "PAMA"), an environmental adjustment and management program. In the event
that Doe Run Peru does not fulfill its obligations under the Investment
Commitment, Doe Run Peru will be obligated to pay in 2002 a penalty payment to
Centromin equal to 30% of any shortfall (a maximum of $36.0 million if none of
the Investment Commitment is made during the five year period) (the "Penalty
Payment"). As of March 31, 1998, Doe Run Peru had expended $1.2 million toward
fulfillment of the Investment Commitment.
 
    In addition to term loans, the Existing Doe Run Mining Credit Facility
provided for a working capital facility of $50.0 million, of which $3.0 million
was drawn on the closing date of the Acquisition. As of October 31, 1997, Doe
Run Mining had outstanding borrowings of $103.0 million under the Existing Doe
Run Mining Credit Facility, $100.0 million in term loans and $3.0 million under
the working capital facility. In addition, Doe Run Mining has an intercompany
payable due to Doe Run Peru reflecting an interest free loan of $125.0 million
made by Metaloroya to Doe Run Mining on the closing date of the Acquisition. The
proceeds of the intercompany payable were used to reduce the outstanding term
loans obtained by Doe Run Mining under the Existing Doe Run Mining Credit
Facility to consummate the Acquisition.
 
DOE RUN FINANCING
 
    As part of Renco's acquisition of Doe Run from Fluor Corporation ("Fluor")
in April 1994, Doe Run undertook certain obligations to Fluor. These obligations
included annual payments by Doe Run in exchange for an eight-year covenant not
to compete, a profit participation arrangement and promissory notes
(collectively, the "Fluor Indebtedness").
 
                                       16
<PAGE>
    Doe Run borrowed $130.0 million under a term loan (the "Doe Run Term Loan")
pursuant to the Credit Agreement, dated as of October 23, 1997, among Doe Run,
as borrower, DR Acquisition Corp. ("DRA"), as parent guarantor, Fabricated
Products, Inc., as subsidiary guarantor, and various financial institutions. Doe
Run used the net proceeds of the Doe Run Term Loan to pay $60.0 million to Fluor
in full settlement of the Fluor Indebtedness, to make the Subordinated Loan and
to make a $2.0 million capital contribution to Doe Run Cayman. In addition, Doe
Run used a portion of the net proceeds of the Doe Run Term Loan to repay all
amounts outstanding under Doe Run's then existing revolving credit facility and
entered into a $100.0 million revolving credit facility (the "Existing Doe Run
Revolving Credit Facility").
 
OLD NOTES OFFERING
 
    On March 12, 1998, Doe Run sold and issued the Old Notes (the "Old Notes
Offering"). The net proceeds from the Old Notes Offering were approximately
$248.6 million. Doe Run used $125.0 million of such net proceeds to make a
deposit (the "Special Term Deposit") in a bank, which in turn loaned such amount
(the "Back-to-Back Loan") to Doe Run Mining. The Special Term Deposit and the
Back-to-Back Loan have payment terms that match the timing and amount of the
payments on $125.0 million of the Fixed Rate Notes, except that additional
interest of 0.50% for the first six months and 0.25% thereafter through
September 2004 is payable on the Back-to-Back Loan. The Back-to-Back Loan is
secured by the Special Term Deposit. Doe Run Mining used the proceeds of the
Back-to-Back Loan to (i) repay amounts outstanding under the Existing Doe Run
Mining Credit Facility and (ii) repay the Subordinated Loan from Doe Run of
$23.0 million. Doe Run used the remaining approximately $123.6 million of the
net proceeds from the Old Notes Offering, together with the proceeds from the
repayment of the Subordinated Loan, to (i) repay amounts outstanding under the
Doe Run Term Loan, (ii) repay amounts under the Existing Doe Run Revolving
Credit Facility, (iii) redeem all of Doe Run's preferred stock held by Renco and
pay accrued dividends thereon and (iv) pay related fees and expenses, including
a transaction fee to Renco. The Old Notes Offering and the application of the
proceeds therefrom are collectively referred to herein as the "Transactions."
 
POTENTIAL ACQUISITIONS
 
   
    On July 28, 1998, Doe Run and ASARCO Incorporated ("ASARCO") entered into an
Asset Purchase and Sale Agreement (the "Asset Purchase Agreement") pursuant to
which Doe Run will purchase (the "Potential ASARCO MLD Acquisition") certain
assets relating to ASARCO's Missouri Lead Division (the "ASARCO MLD"), including
a smelter and refinery and two mines. The purchase price for these assets is
approximately $54.5 million payable at closing, plus contingent deferred
payments, if any. Such deferred payments are contingent upon prevailing LME lead
prices during the five-year period subsequent to the Potential ASARCO MLD
Acquisition. Specifically, Doe Run's obligations under the deferred purchase
price arrangement are determined annually and are only due if the annual LME
spot lead price exceeds $.285 per pound, with such payments not to exceed $12.5
million in the aggregate. See "Business-- Potential Acquisition of ASARCO's
Missouri Lead Division."
    
 
    On July 10, 1998, the Company was informed that it was the winning bidder to
acquire the Cobriza mine and related assets located approximately 500 kilometers
southeast of Lima, Peru and owned by Centromin. Doe Run Peru's La Oroya complex
is located approximately 330 kilometers from the Cobriza mine between it and
Lima. The Cobriza mine produces copper concentrates, all of which currently are
purchased by Doe Run Peru. The Cobriza mine supplies approximately 40% of Doe
Run Peru's copper concentrate requirements. The anticipated purchase price for
these assets is approximately $7.5 million, $3.0 million of which is payable at
closing, with the balance payable in equal annual installments over three years.
This transaction is subject to satisfactory completion of the Company's due
diligence review and negotiation of a definitive agreement to provide for, among
other things, ownership structure, environmental and other liability
allocations, capital contribution requirements and operational management. In
 
                                       17
<PAGE>
addition, certain regulatory and tax matters must be negotiated with the
Peruvian government, and the Company must arrange satisfactory financing for the
transaction. Accordingly, there can be no assurance that a definitive agreement
related to this transaction will be entered into, that negotiations with the
Peruvian government will result in a feasible transaction or that satisfactory
financing can be obtained.
 
                                  RISK FACTORS
 
    See "Risk Factors" for a discussion of certain factors that should be
considered in evaluating an investment in the Exchange Notes.
 
                                       18
<PAGE>
          SUMMARY HISTORICAL AND PRO FORMA CONSOLIDATED FINANCIAL DATA
 
    The following tables set forth historical financial data of (i) the Company
for each of the three fiscal years ended October 31, 1997, which have been
derived from the Company's audited consolidated financial statements, and for
the six months ended April 30, 1997 and 1998 and as of April 30, 1998, which are
unaudited, (ii) Doe Run Peru's predecessors ("Doe Run Peru's Predecessor") for
each of the two fiscal years ended December 31, 1996, which have been derived
from Doe Run Peru's Predecessor's audited consolidated financial statements, and
for the period November 1, 1996 to October 23, 1997 (the date of consummation of
the Acquisition) and the six months ended April 30, 1997, which are unaudited,
(iii) Doe Run Cayman for the six months ended April 30, 1998, which are
unaudited, and (iv) pro forma financial data of the Company for the fiscal year
ended October 31, 1997. The pro forma statement of operations data and other
data for the fiscal year ended October 31, 1997 give effect to the Acquisition
as if it had occurred on November 1, 1996. The information contained in this
table should be read in conjunction with "Unaudited Pro Forma Consolidated
Financial Data," "Selected Historical Consolidated Financial Data,"
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and the audited financial statements of Doe Run and Doe Run Peru's
Predecessor, and the notes thereto, included elsewhere herein.
 
                                  THE COMPANY
<TABLE>
<CAPTION>
                                                                                                            SIX MONTHS ENDED
                                                                       YEAR ENDED OCTOBER 31,                  APRIL 30,
                                                            --------------------------------------------  --------------------
                                                              1995       1996              1997             1997       1998
                                                            ---------  ---------  ----------------------  ---------  ---------
<S>                                                         <C>        <C>        <C>        <C>          <C>        <C>
                                                                                   ACTUAL     PRO FORMA
                                                                                  ---------  -----------
 
<CAPTION>
                                                                             (DOLLARS AND TONS IN THOUSANDS)
<S>                                                         <C>        <C>        <C>        <C>          <C>        <C>
STATEMENT OF OPERATIONS DATA:
Net sales.................................................  $ 225,143  $ 274,930  $ 280,467   $ 709,780   $ 135,905  $ 343,405
Cost of sales.............................................    180,398    215,489    234,351     608,812     108,478    283,105
Depletion, depreciation and amortization..................     12,486     13,654     14,718      21,460       7,323     11,461
Selling, general and administrative expenses..............      8,405     10,079     10,959      26,169       5,804     17,700
Exploration expense.......................................      1,926      2,912      2,705       2,705       1,365      1,599
                                                            ---------  ---------  ---------  -----------  ---------  ---------
Operating income..........................................     21,928     32,796     17,734      50,634      12,935     29,540
 
OTHER DATA:
EBITDA(a).................................................  $  34,282  $  46,805  $  32,415   $  74,479   $  20,264  $  40,366
Capital expenditures......................................      5,377     10,534     13,476      13,476       4,145     10,908
 
OTHER OPERATING DATA:
Average LME lead price per pound(b).......................  $     .28  $     .35  $     .29               $     .31  $     .25
Tons of primary lead metal sold...........................      218.0      228.9      245.1                   117.5      170.1
Tons of secondary lead metal sold.........................       27.9       39.7       44.1                    13.5       22.8
Tons of secondary lead metal tolled.......................       52.4       51.7       60.9                    29.4       25.4
Tons of zinc concentrates sold............................       55.5       68.3       69.7                    36.0       33.1
Tons of copper concentrates sold..........................       23.9       31.3       26.6                    12.8        9.5
Tons of copper metal sold.................................     --         --            0.8                  --           35.2
Ounces of silver metal sold (in millions).................     --         --            0.1                  --           13.0
Tons of zinc metal sold...................................     --         --         --                      --           39.7
Primary smelter lead tons per manshift(c).................        2.1        2.2        2.4                     2.5        2.6
</TABLE>
 
                                       19
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                                              AS OF APRIL 30, 1998
                                                                                                              --------------------
<S>                                                                                                           <C>
                                                                                                                  (DOLLARS IN
                                                                                                                   THOUSANDS)
BALANCE SHEET DATA:
Cash........................................................................................................       $   12,142
Working capital.............................................................................................          100,609
Property, plant and equipment, net..........................................................................          205,867
Total assets................................................................................................          566,878
Total debt (including current portion)......................................................................          390,576
Shareholders' equity........................................................................................           15,876
</TABLE>
 
                 DOE RUN PERU'S PREDECESSOR AND DOE RUN CAYMAN
 
   
<TABLE>
<CAPTION>
                                                               DOE RUN PERU'S PREDECESSOR(D)
                                                       ----------------------------------------------    DOE RUN
                                                                               PERIOD                   CAYMAN(E)
                                                            YEAR ENDED       NOVEMBER 1,  SIX MONTHS   -----------
                                                           DECEMBER 31,        1996 TO    ENDED APRIL  SIX MONTHS
                                                       --------------------  OCTOBER 23,      30,      ENDED APRIL
                                                         1995       1996       1997(F)       1997      30, 1998(G)
                                                       ---------  ---------  -----------  -----------  -----------
                                                                     (DOLLARS AND TONS IN THOUSANDS)
<S>                                                    <C>        <C>        <C>          <C>          <C>
STATEMENT OF OPERATIONS DATA:
Net sales............................................  $ 450,929  $ 456,797   $ 429,313    $ 217,731    $ 227,359
Cost of sales........................................    397,524    397,158     364,901      181,566      181,631
Depreciation and amortization........................      4,729      5,353       5,623        2,753        3,396
Selling, general and administrative expenses.........     15,950     17,420      18,524       10,112       16,870
                                                       ---------  ---------  -----------  -----------  -----------
Operating income.....................................     32,726     36,866      40,265       23,300       25,462
OTHER DATA:
EBITDA(a)............................................  $  35,657  $  18,702   $  45,025    $  24,615    $  28,496
Adjusted EBITDA(h)...................................     38,161     47,716      50,190       27,906
</TABLE>
    
 
   
<TABLE>
<S>                                                    <C>        <C>        <C>          <C>          <C>
OTHER OPERATING DATA:
Tons of lead metal sold..............................       98.7      104.1       106.7         52.4         55.4
Tons of copper metal sold............................       70.0       71.3        68.9         35.7         35.2
Ounces of silver metal sold (in millions)............       19.6       21.2        20.4         10.0         13.0
Tons of zinc metal sold..............................       74.3       77.6        71.0         35.4         39.7
Average LME copper price per pound...................  $    1.33  $    1.04   $    1.07    $    1.07    $     .80
Average LBMA silver price per ounce(i)...............       5.20       5.10        4.79         4.79         5.96
Average LME zinc price per pound.....................        .47        .47         .59          .52          .50
</TABLE>
    
 
- ------------------------------
(a) EBITDA is defined as net income (loss) before extraordinary item plus the
    sum of net interest expense, income taxes and depletion, depreciation and
    amortization. The trends of EBITDA generally follow the trends of operating
    income. See "Management's Discussion and Analysis of Financial Condition and
    Results of Operations" for a discussion of the recent trends of operating
    income. Information regarding EBITDA is presented because management
    believes that certain investors use EBITDA as one measure of an issuer's
    ability to service its debt. EBITDA should not be considered an alternative
    to, or more meaningful than, operating income or cash flow as an indicator
    of an issuer's operating performance. EBITDA is not necessarily a measure of
    the funds available for debt service because such funds could be used to
    fund operating requirements or other expenditures required by the Company's
    business instead of debt service. Furthermore, caution should be used in
    comparing EBITDA to similarly titled measures of other companies as the
    definitions of these measures may vary.
(b) The average lead price per pound realized by Doe Run generally is at a
    premium over the average LME price.
(c) Primary smelter lead tons per manshift is computed by dividing metal
    produced at Doe Run by the shifts required to produce the related tons.
    Shifts are computed by dividing the sum of actual hours worked during the
    period for hourly employees and 52 hours per week for salaried employees by
    eight hours.
(d) Metaloroya was acquired by Doe Run Peru effective October 23, 1997.
(e) Doe Run Cayman, a wholly-owned subsidiary of Doe Run, is the parent company
    of Doe Run Mining and currently has no independent operations.
(f) Doe Run Cayman's net sales, operating income and EBITDA for the eight-day
    period October 23, 1997 to October 31, 1997 were $2.6 million, $.4 million
    and $.5 million, respectively.
(g) These results include intercompany transactions. Net sales, cost of sales
    and selling, general and administrative expense excluding the effects of
    intercompany transactions were $224.9 million, $179.3 million and $9.1
    million, respectively.
   
(h) Adjusted EBITDA is defined as EBITDA adjusted for the following
    non-recurring charges: (i) for 1995, $2.5 million relating to personnel
    reduction costs, (ii) for 1996, $3.9 million relating to personnel reduction
    costs, $21.6 million relating to one-time environmental expenses and $3.6
    million relating to privatization costs, (iii) for the period November 1,
    1996 to October 23, 1997, $3.2 million relating to privatization costs and
    $2.0 million relating to personnel reduction costs and (iv) for the six
    months ended April 30, 1997, $2.0 million relating to privatization costs
    and $.5 million relating to personnel reduction costs.
    
(i) "LBMA" means the London Bullion Market Association.
 
                                       20
<PAGE>
                                  RISK FACTORS
 
    PROSPECTIVE INVESTORS IN THE EXCHANGE NOTES SHOULD CONSIDER CAREFULLY THE
RISK FACTORS SET FORTH BELOW, AS WELL AS THE OTHER INFORMATION APPEARING IN THIS
PROSPECTUS, BEFORE MAKING AN INVESTMENT IN THE EXCHANGE NOTES.
 
SUBSTANTIAL INDEBTEDNESS
 
   
    The Company has substantial indebtedness and debt service requirements. As
of June 30, 1998, the Company had $397.7 million of indebtedness outstanding
(including the Back-to-Back Loan of $125.0 million but exclusive of aggregate
unused commitments of $129.7 million under the New Revolving Credit Facilities),
and none of the Company's indebtedness was subordinated to the Old Notes. Pro
forma debt as of April 30, 1998, would have been $450.6 million, reflecting the
financing related to the Potential ASARCO MLD Acquisition of $60.0 million. In
addition, the Indenture permits the Company to incur certain other indebtedness.
See "Description of the Notes--Certain Covenants--Limitation on Indebtedness."
    
 
    The Company's level of indebtedness will have several important effects on
its future operations, including the following: (a) a significant portion of the
Company's cash flow from operations will be dedicated to the payment of interest
on its indebtedness and will not be available for other purposes, (b) the
financial covenants and other restrictions contained in the New Revolving Credit
Facilities require Doe Run and Doe Run Peru, as applicable, to meet certain
financial tests and limit their ability to borrow additional funds or to dispose
of assets and (c) the Company's ability to obtain additional financing in the
future for working capital, capital expenditures, acquisitions, general
corporate purposes or other purposes may be impaired. In addition, the ability
of the Company to meet its debt service obligations and to reduce its total debt
will be dependent upon its future performance, which will be subject to general
economic conditions and to financial, business and other factors affecting its
operations, many of which are beyond their control. Moreover, an inability of
Doe Run or Doe Run Peru to meet the financial covenants contained in the New
Revolving Credit Facilities or other indebtedness could result in an
acceleration of amounts due thereunder. Doe Run was not in compliance with the
minimum net worth and maximum leverage ratio covenants under the Doe Run Term
Loan and the Existing Doe Run Revolving Credit Facility for the fiscal quarter
ended January 31, 1998, for which Doe Run received waivers.
 
RESTRICTIONS IMPOSED BY TERMS OF THE COMPANY'S INDEBTEDNESS
 
    The terms and conditions of the New Revolving Credit Facilities and the
Indenture impose restrictions that affect, among other things, the ability of
the Company to incur debt, pay dividends, make acquisitions, create liens, make
capital expenditures and make certain investments.
 
    The ability of the Company to comply with the foregoing provisions can be
affected by events beyond the Company's control. The breach of any of these
covenants could result in a default under the Company's indebtedness, including
the New Revolving Credit Facilities and the Indenture. In the event of any such
default, depending on the actions taken by the lenders under the New Revolving
Credit Facilities, Doe Run may be unable to make any payments of principal or
interest on the Exchange Notes for a period of time. In addition, the lenders
under the New Revolving Credit Facilities could elect to declare all amounts
borrowed, together with accrued and unpaid interest, to be due and payable. If
Doe Run or Doe Run Peru, as the case may be, were unable to repay such amounts,
the lenders under the New Revolving Credit Facilities could proceed against
certain collateral. If such indebtedness under the New Revolving Credit
Facilities were to be accelerated, there can be no assurance that the assets of
the Company would be sufficient to repay in full such indebtedness and the other
indebtedness of the Company, including the Exchange Notes. See "Description of
New Revolving Credit Facilities" and "Description of the Notes."
 
                                       21
<PAGE>
DEPENDENCE ON CASH FLOW FROM PERUVIAN SUBSIDIARIES
 
    The Company is dependent upon payments from Doe Run Mining and Doe Run Peru,
including loans, advances, distributions and dividends from Doe Run Peru, to
meet a portion of its debt service requirements. Doe Run, Doe Run Mining and Doe
Run Peru have entered into various intercompany agreements which provide for
certain payments to Doe Run. See "Certain Transactions--Intercompany
Transactions." The Company believes that these intercompany agreements and the
availability of dividends, distributions, loans or advances from Doe Run Mining
or Doe Run Peru will provide Doe Run sufficient funds, combined with Doe Run's
available resources, to adequately service Doe Run's debt service requirements.
However, no assurance can be given that such amounts will be sufficient or that
changes in the laws of Peru will not adversely affect such payments, loans,
advances, distributions or dividends. See "--Governmental Regulation."
 
VOLATILITY OF BASE METAL PRICES; TREATMENT CHARGES AND PENALTIES
 
    Base metal prices fluctuate and are affected by numerous factors beyond the
Company's control, including expectations for inflation, speculative activities,
global and regional demand and production, political and economic conditions and
production costs in major producing regions. The aggregate effect of these
factors is impossible for the Company to predict; however, these factors could
have a material adverse effect on the results of operations, financial condition
and liquidity of the Company.
 
    If the market price for lead falls below Doe Run's production costs and
remains at such level for a sustained period, Doe Run will experience losses and
may curtail or discontinue the development of a project or mining at one or more
of its properties. In fiscal 1992 and 1993, Doe Run experienced operating losses
due in part to unfavorable lead prices. As of June 30, 1998, the LME price for
lead was $.25 per pound, which was below the ten-year average price of $.28 per
pound. As a result of the recent lead price decreases, the Company expects that
it will incur an operating loss in its U.S. operations that will adversely
affect its EBITDA in fiscal 1998. There can be no assurance that lead prices
will not decrease further in the future to levels resulting in operating losses
for Doe Run.
 
    If Doe Run Peru acquires the Cobriza mine, it would become an integrated
copper producer and, as such, Doe Run Peru's results of operations and financial
condition would be sensitive to copper price fluctuations.
 
    If base metal prices, treatment charges or penalties fall to such levels
that Doe Run Peru cannot cover its production costs and remain at such levels
for a sustained period, or result in the closure of the mines providing
concentrate feedstock, Doe Run Peru will experience losses. There can be no
assurance that base metal prices, treatment charges or penalties will not
decrease in the future to levels resulting in operating losses for Doe Run Peru.
 
    While the Company may periodically use hedging techniques to reduce a
portion of its exposure to the volatility of base metal prices, there can be no
assurance that it will be able to do so effectively. See "Management's
Discussion and Analysis of Results of Operations and Financial
Condition--Liquidity and Capital Resources--Hedging Activities."
 
GOVERNMENTAL REGULATION
 
    The mining operations of Doe Run are subject to inspection and regulation by
the Mine Safety and Health Administration of the Department of Labor ("MSHA")
under provisions of the Federal Mine Safety and Health Act of 1977. All other
operations of Doe Run are subject to inspection and regulation by the
Occupational Safety and Health Administration of the Department of Labor
("OSHA") under the provisions of the Occupational Safety and Health Act of 1970.
It is Doe Run's policy to comply with the directives and regulations of MSHA and
OSHA. In addition, Doe Run takes such necessary actions as, in its judgment, are
required to provide for the safety and health of its employees. MSHA and OSHA
 
                                       22
<PAGE>
directives have had no material adverse impact on Doe Run's results of
operations or financial condition, and Doe Run believes that it is substantially
in compliance with the regulations promulgated by MSHA and OSHA; however,
compliance with new, more stringent MSHA and/or OSHA directives could have a
material adverse effect on results of operations, financial condition and
liquidity of Doe Run.
 
    In connection with the Acquisition, Doe Run Peru, Doe Run Mining and Doe Run
Cayman entered into a series of agreements (the "Stabilization Agreements") with
two Peruvian government agencies, the Ministry for Energy and Mines (the "MEM")
and the National Commission for Foreign Investments. Pursuant to terms of the
Stabilization Agreements, the Peruvian government has guaranteed that, for a
period of ten years from the date of the Acquisition, Doe Run Peru, Doe Run
Mining and Doe Run Cayman will not be adversely affected by changes in Peruvian
legal regimes relating to, among other things, income tax, employment, free
access to foreign exchange, right to remit investments and profits outside Peru
and non-discrimination based on non-Peruvian ownership. No assurance can be
given that the Peruvian government will not impose other conditions that may
adversely affect Doe Run Peru's business, financial condition or results of
operations or that there will not be changes in Peruvian legal regimes that will
adversely affect Doe Run Peru, Doe Run Mining or Doe Run Cayman after the
expiration of the Stabilization Agreements.
 
ENVIRONMENTAL MATTERS AND CLAIMS
 
    Doe Run is subject to numerous federal, state and local environmental laws
and regulations governing, among other things, air emissions, waste water
discharge, solid and hazardous waste storage, treatment and disposal, and
remediation of releases of hazardous materials. Doe Run also is a defendant in
four lawsuits filed in 1995 claiming property damage and personal injury from
alleged releases of lead from the Herculaneum smelter. Punitive damages are also
being sought in these cases. Environmental laws and regulations have changed
rapidly in recent years and may become more stringent in the future. Insurance
against environmental risks (including potential for pollution or other hazards
as a result of disposal of waste products occurring from mining, milling and
smelting) is not generally available to Doe Run or to other companies within the
industry. Should Doe Run be unable to fund fully the cost of compliance or of
remediating an environmental problem, Doe Run might be required to suspend
operations or enter into interim compliance measures requiring additional
expenditures pending completion of the required remedy. Compliance with
environmental laws and regulations, as well as personal injury and property and
other damage claims, could have a material adverse effect on Doe Run's results
of operations, financial condition and liquidity. See "Business--Doe
Run--Environmental Matters."
 
    Doe Run Peru is subject to numerous environmental laws and regulations
enacted in the last ten years in Peru governing, among other things, air
emissions, waste water discharge, solid and hazardous waste storage, treatment
and disposal, and remediation of releases of hazardous materials. The current
and future application of these laws and regulations to Doe Run Peru is modified
by certain agreements with the MEM, a Peruvian governmental agency. Given the
developing nature of environmental law and enforcement policies in Peru,
however, there can be no assurance that the Peruvian government will not in the
future require compliance with additional environmental requirements that could
adversely affect Doe Run Peru's business, financial condition or results of
operations. Further, there can be no assurance that the Peruvian government or
other interested persons will not seek changes in the future to the terms and
conditions of any of the agreements made by Doe Run Peru with the MEM that may
adversely affect Doe Run Peru's business, financial conditions or results of
operations. Doe Run Peru also is subject to claims for alleged personal injury
and property and other damages resulting from release of certain substances into
the environment, including lead, to the extent such liabilities were not
retained and are not satisfied by Centromin. Compliance with environmental laws
and regulations, as well as personal injury and property and other damage
claims, could have a material adverse effect on Doe Run Peru's business,
financial condition or results of operations. Insurance against environmental
risks (including potential for pollution or other hazards as a result of
disposal of waste products occurring from exploration and production) is not
 
                                       23
<PAGE>
generally available to Doe Run Peru or to other companies within the industry.
To the extent Doe Run Peru is subject to environmental liabilities, the payment
of such liabilities would reduce its available funds. Should Doe Run Peru be
unable to fund fully the cost of remediating an environmental problem, it could
be required to suspend operations or take interim compliance measures pending
completion of the required remedy. See "Business--Doe Run Peru--Environmental
Matters."
 
OPERATING RISKS
 
    The business of mining is generally subject to a number of risks and
hazards, including environmental hazards, industrial accidents, labor disputes,
encountering unusual or unexpected geologic formations, cave-ins, rockbursts,
flooding and periodic interruptions due to inclement or hazardous weather
conditions. Such risks could result in damage to, or destruction of, mineral
properties or producing facilities, personal injury, environmental damage,
delays in mining, monetary losses and possible legal liability. Although Doe Run
maintains insurance within ranges of coverage consistent with industry practice,
no assurance can be given that such insurance will be available at economically
feasible premiums. In July 1992, Doe Run experienced a strike by the workers at
the Herculaneum smelter resulting in metal output significantly lower than
planned levels and higher operating expenses due to increased security costs and
outside services. Although Doe Run's work force is no longer significantly
unionized, there can be no assurance that Doe Run will not experience labor
disputes in the future. In July and August 1993, production at the Herculaneum
smelter was curtailed significantly due to flooding of the Mississippi River.
There can be no assurance that Doe Run's operations will not be adversely
affected in the future by flooding or other adverse conditions beyond Doe Run's
control. See "Management's Discussion and Analysis of Results of Operations and
Financial Condition."
 
    The business of smelting and refining complex concentrates generally is
subject to a number of risks and hazards, including environmental hazards,
industrial accidents and labor disputes. Such risks could result in personal
injury, environmental damage, delays in operation, monetary losses and possible
legal liability. Although Doe Run Peru maintains insurance within ranges of
coverage consistent with industry practice, no assurance can be given that such
insurance will be available at economically feasible premiums. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
 
FACTORS RELATING TO DOE RUN
 
  DEPENDENCE ON A LIMITED NUMBER OF CUSTOMERS
 
    Doe Run relies heavily on a small number of customers which purchase a
significant portion of its lead to produce lead-acid batteries. Johnson
Controls, Inc. ("JCI") purchased lead and tolling services representing
approximately 12% of Doe Run's fiscal 1997 net sales. In addition, Big River
Zinc Corporation ("Big River") purchased zinc concentrates representing
approximately 10% of Doe Run's fiscal 1997 net sales. The loss of any of Doe
Run's largest customers or curtailment of purchases by such customers could have
a material adverse effect on the results of operations, financial condition and
liquidity of Doe Run.
 
  DEPENDENCE ON LEAD-ACID BATTERY USE
 
    Doe Run sells a significant portion of its lead production for use in
lead-acid batteries. Lead-acid battery producers or their suppliers accounted
for approximately 63% of Doe Run's fiscal 1997 net sales. The obsolescence of,
or any curtailment in the use of, lead-acid batteries could have a material
adverse effect on the results of operations, financial condition and liquidity
of Doe Run.
 
  RESERVES
 
    The ore reserve figures presented in this Prospectus are, in large part,
estimates made by Doe Run's technical personnel, and no assurance can be given
that the indicated level of recovery of these metals will
 
                                       24
<PAGE>
be realized. Market price fluctuations of lead, as well as increased production
costs or reduced recovery rates, may render ore reserves containing relatively
lower grades of mineralization uneconomic and may ultimately result in a
restatement of reserves. Moreover, short-term operating factors relating to the
ore reserves, such as the need for sequential development of ore bodies and the
processing of new or different ore grades, may adversely affect Doe Run's
results of operations in any particular accounting period. Doe Run assumes
certain metal prices for its mineral reserve calculations, which approximate
current market prices, but these lead prices may vary from current market prices
based on a number of factors likely to influence lead prices over the near term.
See "Business--Doe Run--Reserves."
 
  EXPLORATION AND DEVELOPMENT
 
    Doe Run competes to acquire properties producing or capable of producing
lead and other minerals, conducts exploration activities and engages in
development projects. As a result of the competition for property, some of which
is with companies with greater financial resources than Doe Run, Doe Run may be
unable to acquire attractive mining properties on terms it considers acceptable.
Mineral exploration is highly speculative in nature, involves many risks and
frequently is nonproductive, and there can be no assurance that Doe Run's
mineral exploration efforts will be successful. Once mineralization is
discovered, it may take a number of years from the initial phases of drilling
until production is possible, during which time the economic feasibility of
production may change. Doe Run's ability to increase its production longevity is
dependent on the successful development of new ore bodies and/or expansion of
existing mining operations. It is possible that actual cash operating costs and
economic returns of any and all development projects may materially differ from
the estimated costs and returns. Accordingly, there can be no assurance that Doe
Run's programs will yield new reserves to expand and replace existing reserves
that are being depleted by current production.
 
FACTORS RELATING TO DOE RUN PERU
 
  EXPANSION AND MODERNIZATION PROGRAM
 
    Doe Run Peru is undertaking an expansion and modernization program to
enhance its competitive position and financial performance and to comply with
certain environmental regulatory requirements (see "Business--Doe Run
Peru--Environmental Matters") and the Subscription Agreement related to the
Acquisition. Doe Run Peru believes that it will invest approximately $195.0
million over ten years in order to comply with such environmental requirements.
Under the Subscription Agreement, Doe Run Peru has five years to fulfill its
$120.0 million Investment Commitment. The maximum penalty that may be assessed
for failure to comply with the Investment Commitment of the Subscription
Agreement is 30% of the unfulfilled Investment Commitment. Doe Run Peru has
developed a ten-year Capital Investment Program of approximately $300.0 million
designed to improve its operations, as well as to address these environmental
requirements and fulfill the Investment Commitment.
 
    Although management expects that cash from existing and future operations
and available borrowings under the New Doe Run Peru Revolving Credit Facility
and from anticipated borrowings in the future will be sufficient to cover the
costs of Doe Run Peru's Capital Investment Program, there can be no assurance
that Doe Run Peru will not be required to seek additional funds in order to
complete its expansion and modernization program. Upon the incurrence of any
borrowings under the New Doe Run Peru Revolving Credit Facility, there can be no
assurance that Doe Run Peru's increased leverage will not have an adverse impact
on Doe Run Peru's liquidity. If additional funds are necessary, there can be no
assurance that Doe Run Peru will be able to obtain the required funds on terms
and conditions acceptable to it. If such additional financing is unavailable,
Doe Run Peru may have to delay completion of the expansion and modernization
program until additional financing or sufficient internally generated funds
become available, and any such delay could have a material adverse effect on the
business, financial condition or results of operations of Doe Run Peru.
 
                                       25
<PAGE>
  AVAILABILITY OF CONCENTRATES
 
    Doe Run Peru, as presently constituted, does not own any of the mines from
which it sources concentrates. Accordingly, Doe Run Peru purchases all of its
concentrates feedstock requirements from unaffiliated mining operations. Doe Run
Peru obtains approximately 84% of its copper concentrates from the Peruvian
domestic market, approximately 48% of which are sourced from the Cobriza mine.
All of Doe Run Peru's lead and zinc concentrates are sourced from the Peruvian
domestic market. Doe Run Peru's current concentrate contracts are predominately
for one-year terms expiring December 31, 1998. There can be no assurance that
these contracts will be renewed or that, if renewed, they will not be on terms
less favorable to Doe Run Peru. The closure of mines supplying concentrates due
to exhaustion of reserves, low metals prices or otherwise or the inability of
Doe Run Peru to obtain concentrates, or to obtain them on favorable terms, could
have a material adverse effect on the business, financial condition or results
of operations of Doe Run Peru.
 
  SUPPLY AND COST OF RAW MATERIALS
 
    In addition to concentrates feedstock, Doe Run Peru's operations are heavily
dependent on the supply of various raw materials, including water, hydroelectric
power, oxygen, coal and fluxes. Doe Run Peru produces its oxygen requirements
from its oxygen plant and extracts limestone and silica fluxes from deposits
close to its facility. Doe Run Peru purchases its coal requirements through
annual contracts based on market prices. Doe Run Peru has entered into a
long-term contract with Empresa de Electricidad de Los Andes, S.A.
("Electroandes") to supply its electricity needs on satisfactory terms, though
at costs higher than those paid by Doe Run Peru's Predecessor. The availability
of raw materials could be affected by natural disasters or other factors beyond
Doe Run Peru's control. Any protracted interruption in the availability of any
raw materials could have a material adverse effect on the business, financial
condition or results of operations of Doe Run Peru.
 
  LABOR MATTERS
 
    Approximately 89% of Doe Run Peru's workforce is represented by labor
unions. Doe Run Peru recently entered into new five-year collective bargaining
agreements with its labor unions. Although management believes its present labor
relations are generally good, in the past, work stoppages and strikes have
occurred. There can be no assurance that a work stoppage or strike will not
occur prior to the expiration of the current labor agreements or during
negotiations for new labor agreements (including extensions of the existing
labor agreements) or as to the effect of any such work stoppage or strike on Doe
Run Peru's production levels. Work stoppages or other labor-related developments
affecting Doe Run Peru could have a material adverse effect on the business,
financial condition or results of operations of Doe Run Peru. See "Business--Doe
Run Peru--Employees" and "--Benefit Plans."
 
  ENFORCEABILITY OF JUDGMENTS UNDER PERUVIAN LAW
 
    Substantially all of the assets of Doe Run Peru are located in Peru. In the
event that the holders of Exchange Notes were to obtain a judgment in the United
States against Doe Run Mining or Doe Run Peru and seek to enforce such judgment
in Peru, the holders' ability to enforce the judgment in Peru would be subject
to Peruvian laws regarding recognition and enforcement of foreign judgments.
According to the rules of recognition and enforcement of foreign judgments
provided by the Peruvian Civil Code, a judgment issued by a competent court
outside Peru would be recognized and enforced by Peruvian courts provided that
there is in effect a treaty between the country where said foreign court sits
and Peru, regarding the recognition and enforcement of foreign judgments. In the
absence of such treaty, as is the case between the United States and Peru,
Peruvian courts will give to the foreign judgment the same force and treatment
that is given by the country where such foreign court sits to the judgments
enacted by Peruvian courts, PROVIDED that the foreign judgment complies with the
following statutory limitations set forth in Article 2104 of the Peruvian Civil
Code: (i) the judgment must not resolve matters for which
 
                                       26
<PAGE>
exclusive jurisdiction of Peruvian courts applies (I.E., disputes relating to
real estate located in Peru); (ii) the competence of the foreign court which
issued the judgment must be recognized by Peruvian conflicts of law rules; (iii)
the party against whom the judgment was obtained must have been properly served
in connection with the foreign proceedings; (iv) the judgment of the foreign
court must be a final judgment, not subject to any further appeal; (v) no
pending proceedings may exist in Peru among the same parties and on the same
subject; (vi) the judgment by the foreign court cannot be in violation of public
policy; and (vii) the foreign court must grant reciprocal treatment to judgments
issued by Peruvian courts.
 
FACTORS RELATING TO PERU
 
  POLITICAL AND ECONOMIC SITUATION IN PERU
 
    During the past 30 years, Peru has experienced political instability under
both civilian and military governments. These governments have pursued various
policies, including frequent intervention in the economic and social structure.
Past governments have imposed controls on prices, exchange rates, local and
foreign investment and international trade, restricted the ability of companies
to dismiss employees, expropriated private sector assets, and prohibited the
remittance of profits to foreign investors and payments to foreign creditors. In
1974, the government of Peru expropriated the assets of Doe Run Peru's
Predecessor and transferred them to Centromin, a government-owned conglomerate.
 
    Since the current administration took office in July 1990, the Peruvian
government has implemented a broad-based reform of Peru's political system,
economy and social conditions, aimed at stabilizing the economy, restructuring
the national government by reducing bureaucracy, privatizing state-owned
companies, promoting private investment, developing and strengthening free
markets, institutionalizing democratic representations, and enacting programs
for the strengthening of basic services related to education, health, housing
and infrastructure. Its then existing congressional body was dissolved in April
1992, and a new democratically elected congressional body was established in
November 1992. A new Constitution was enacted and ratified in the fourth quarter
of 1993. Under the current administration, inflation, as measured by the
Peruvian Banco Central de Reserva (the "Central Bank"), has decreased from
7,649.7% in 1990 to 11.8% for 1996 and 6.5% for 1997. In addition, Peru's gross
domestic product ("GDP"), as measured by the Central Bank, in real terms
increased by 6.4% in 1993, 13.1% in 1994, 7.2% in 1995, 2.6% in 1996 and 7.4% in
1997.
 
    Notwithstanding the progress achieved in restructuring Peru's political
institutions and revitalizing the economy during the administration's first
term, there can be no assurance that the current administration or future
administrations can sustain such progress. While the Peruvian economy has
experienced strong growth in recent years, there can be no assurance that such
growth will continue at similar rates in the future or at all. Doe Run Peru's
financial condition and results of operations could be adversely affected by
changes in economic or other policies of the Peruvian government, including the
trend toward privatization, or other political or economic developments in Peru.
 
  EXCHANGE CONTROLS
 
    During the 1970s and 1980s, government policies restricted the ability of
companies in Peru to, among other things, repatriate funds and import products,
including oil, from abroad. In addition, currency exchange rates were strictly
controlled and all export sales revenues were required to be deposited in the
Central Bank where they were exchanged from U.S. dollars to the then local
currency at less-than-market rates of exchange. The current Peruvian legal
framework imposes no restrictions on the ability of a company operating in Peru
to transfer foreign currency from Peru to other countries or to convert Peruvian
currency into foreign currency or foreign currency into Peruvian currency. Prior
to 1991, Peru had restrictive exchange controls and exchange rates. In the 1970s
and 1980s, all foreign exchange proceeds were required to be deposited with the
Central Bank. There can be no assurance that the Peruvian government will
continue its current policy of permitting currency transfers and conversions
without
 
                                       27
<PAGE>
restriction or that Doe Run Peru would be able to service its debt obligations
in a timely manner were the Peruvian government to reinstitute exchange
controls. Notwithstanding the foregoing, certain of the Stabilization Agreements
relate to free access to foreign exchange. However, no assurance can be given
that there will not be changes in the Peruvian legal regimes that could
adversely effect Doe Run Peru, Doe Run Mining or Doe Cayman upon expiration of
the Stabilization Agreements.
 
  TERRORIST ACTIVITY
 
    Peru experienced significant terrorist activity in the 1980s and early
1990s, during which period terrorist groups escalated their acts of violence
against the government, the private sector and Peruvian residents. According to
Peruvian government estimates, terrorist activity in Peru during the last
sixteen years has resulted in an estimated 25,000 deaths and damage to property
and the economy estimated at $25 billion.
 
    There has been substantial progress in suppressing terrorist activity since
1990, in part as a result of the arrest of the leaders and approximately 2,000
members of the two principal terrorist groups. Approximately 6,000 additional
persons have agreed to cooperate with the government under an amnesty law.
Notwithstanding the success achieved, some incidents of terrorist activity
continue to occur, including the recently resolved hostage incident at the
residence of the ambassador of Japan to Peru. Although Doe Run Peru has
implemented certain anti-terrorist practices, there can be no assurance that
future terrorist activity will not have a material adverse effect on the
business, financial condition or results of operations of Doe Run Peru.
 
  INFLATION AND CURRENCY DEVALUATION
 
    Peru has in the past experienced high levels of inflation. However, the
inflation rate in Peru, as measured by the Central Bank consumer price index,
has fallen from 7,649.7% in 1990 to 139.2% in 1991, 56.7% in 1992, 39.5% in
1993, 15.4% in 1994, 10.2% in 1995, 11.8% in 1996 and 6.5% in 1997. Although the
Peruvian government's stabilization plan has reduced inflation significantly,
there can be no assurance that domestic inflation will not increase from its
current level. In addition, the Peruvian currency has been devalued numerous
times during the last twenty years. The devaluation rate, as measured by the
Central Bank, was 4,012.9% in 1990, 77.0% in 1991, 69.8% in 1992, 31.9% in 1993,
1.4% in 1994, 6.0% in 1995, 12.6% in 1996 and 5.9% in 1997. A portion of the
operating costs of Doe Run Peru are denominated in nuevos soles and therefore
could be significantly affected by the rate of inflation in Peru. If inflation
in Peru were to increase significantly without a corresponding devaluation of
the nuevo sol, the financial condition and results of operations of Doe Run Peru
could be materially and adversely affected.
 
CONTROL BY RENCO
 
    Doe Run and the Guarantors are indirect subsidiaries of Renco, of which Mr.
Ira Leon Rennert is the controlling shareholder. As a result of his indirect
ownership of Doe Run and the Guarantors, Mr. Rennert is, and will continue to
be, able to direct and control the policies of Doe Run and the Guarantors,
including mergers, sales of assets and similar transactions.
 
ABSENCE OF A PUBLIC MARKET
 
    The Exchange Notes will be new securities for which there is currently no
public market. Doe Run does not intend to list the Exchange Notes on any
national securities exchange or quotation system. The Initial Purchasers have
advised Doe Run that they currently intend to make a market in the Exchange
Notes, but they are not obligated to do so and, if commenced, may discontinue
such market making at any time. Accordingly, there can be no assurance as to the
development of any market or liquidity of any market that may develop for the
Exchange Notes. To the extent that Old Notes are tendered and accepted
 
                                       28
<PAGE>
in the Exchange Offer, the aggregate principal amount of Old Notes outstanding
will decrease, with a resulting decrease in the liquidity of the market
therefor.
 
CONSEQUENCES OF FAILURE TO EXCHANGE
 
    Holders of Old Notes who do not exchange their Old Notes for Exchange Notes
pursuant to the Exchange Offer will continue to be subject to the restrictions
on transfer of the Old Notes set forth in the legend thereon as a consequence of
the issuance of the Old Notes pursuant to an exemption from, or in a transaction
not subject to, the registration requirements of the Securities Act. In general,
Old Notes may not be offered or sold, unless registered under the Securities
Act, except pursuant to an exemption from, or in a transaction not subject to,
the Securities Act and applicable state securities laws. Doe Run currently does
not anticipate that it will register the Old Notes under the Securities Act.
 
                                USE OF PROCEEDS
 
    Doe Run will not receive any proceeds from the Exchange Offer. In
consideration for issuing the Fixed Rate Exchange Notes and Floating Rate
Exchange Notes as contemplated in this Prospectus, Doe Run will receive in
exchange Fixed Rate Old Notes and Floating Rate Old Notes, respectively, of like
principal amount, the terms of which are identical in all material respects to
the Fixed Rate Exchange Notes and Floating Rate Exchange Notes, respectively.
The Old Notes surrendered in exchange for Exchange Notes will be retired and
canceled and cannot be reissued. Accordingly, issuance of the Exchange Notes
will not result in any increase in the indebtedness of Doe Run. Doe Run has
agreed to bear the expenses of the Exchange Offer pursuant to the Registration
Rights Agreement. No underwriter is being used in connection with the Exchange
Offer.
 
    See "Prospectus Summary--Recent Transactions--Old Notes Offering" for a
description of the use of proceeds from the Old Notes Offering.
 
                                       29
<PAGE>
                                 CAPITALIZATION
 
    The following table sets forth the consolidated capitalization of the
Company as of April 30, 1998 on an actual basis and as adjusted for the
Potential ASARCO MLD Acquisition. This table should be read in conjunction with
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and the consolidated financial statements and the related notes
thereto appearing elsewhere herein.
   
<TABLE>
<CAPTION>
                                                                                         AS OF APRIL 30, 1998
                                                                                        -----------------------
<S>                                                                                     <C>         <C>
                                                                                          ACTUAL    AS ADJUSTED
                                                                                        ----------  -----------
 
<CAPTION>
                                                                                        (DOLLARS IN THOUSANDS,
                                                                                           EXCEPT PER SHARE
                                                                                               AMOUNTS)
<S>                                                                                     <C>         <C>
Long-term debt (including current portion):
  New Doe Run Revolving Credit Facility(a)............................................  $    4,681   $   4,681
  New Doe Run Peru Revolving Credit Facility(b).......................................      --          --
  Fixed Rate Old Notes................................................................     200,000     200,000
  Floating Rate Old Notes.............................................................      55,000      55,000
  Back-to-Back Loan(c)................................................................     125,000     125,000
  Financing related to the Potential ASARCO MLD Acquisition(d)........................      --          60,000
  Industrial revenue bonds............................................................         895         895
                                                                                        ----------  -----------
Total long-term debt..................................................................  $  385,576   $ 445,576
 
Doe Run Peru short-term borrowings....................................................       5,000       5,000
                                                                                        ----------  -----------
Total debt............................................................................  $  390,576   $ 450,576
 
Shareholders' equity:
  Common stock, par value $.10 per share, 1,000 shares authorized, issued and
    outstanding.......................................................................           0           0
  Additional paid-in capital..........................................................       5,000       5,000
  Retained earnings...................................................................      10,876      10,876
                                                                                        ----------  -----------
Total shareholders' equity............................................................      15,876      15,876
                                                                                        ----------  -----------
Total capitalization..................................................................  $  406,452   $ 466,452
                                                                                        ----------  -----------
                                                                                        ----------  -----------
</TABLE>
    
 
- ------------------------
 
(a) Represents the $100.0 million New Doe Run Revolving Credit Facility which
    will expire in March 2001. See "Description of New Revolving Credit
    Facilities--New Doe Run Revolving Credit Facility."
 
(b) Represents the $40.0 million New Doe Run Peru Revolving Credit Facility. See
    "Description of Revolving Credit Facilities--New Doe Run Peru Revolving
    Credit Facility."
 
(c) Represents a $125.0 million loan to Doe Run Mining from proceeds of the Old
    Notes Offering deposited in a bank by Doe Run. See "Prospectus
    Summary--Recent Transactions--Old Notes Offering."
 
   
(d) Represents the financing related to the purchase price of the assets of the
    ASARCO MLD.
    
 
                                       30
<PAGE>
                UNAUDITED PRO FORMA CONSOLIDATED FINANCIAL DATA
 
    The following unaudited pro forma balance sheet data has been prepared to
give effect to the Potential ASARCO MLD Acquisition as if it had occurred on
April 30, 1998. The following unaudited pro forma consolidated statement of
operations and other data has been prepared to give effect to the Acquisition by
Doe Run Peru of Metaloroya from Centromin, a Peruvian government-owned
conglomerate, as part of the ongoing privatization program sponsored by the
government of Peru and the Transactions, consisting of the Old Notes Offering,
repayment of amounts outstanding under the Existing Doe Run Mining Credit
Facility, repayment of the Subordinated Loan of $23.0 million from Doe Run to
Doe Run Mining, repayment of amounts under the Doe Run Term Loan, repayment of
amounts under the Existing Doe Run Revolving Credit Facility, redemption of all
of Doe Run's preferred stock held by Renco and payment of accrued dividends
thereon and payment of related fees and expenses. The unaudited pro forma as
adjusted consolidated statement of operations and other data give further effect
to the Potential ASARCO MLD Acquisition. The unaudited pro forma consolidated
statement of operations and other data for the year ended October 31, 1997 give
effect to the Acquisition and the Transactions and for the six months ended
April 30, 1998 give effect to the Transactions as if they had occurred on
November 1, 1996. The unaudited pro forma as adjusted consolidated statement of
operations and other data for the year ended October 31, 1997 and for the six
months ended April 30, 1998 give further effect to the Potential ASARCO MLD
Acquisition as if it had occurred on November 1, 1996.
 
   
    The pro forma adjustments are based upon available information and certain
assumptions that the Company believes are reasonable under the circumstances.
Pro forma adjustments are applied to account for the Acquisition and the
Potential ASARCO MLD Acquisition under the purchase method of accounting. Under
the purchase method of accounting, the total purchase price was allocated to Doe
Run Peru's or ASARCO MLD's, as the case may be, assets and liabilities based on
their relative fair values. The purchase price for the ASARCO MLD is
approximately $54.5 million payable at closing, plus contingent deferred
payments, if any. Such deferred payments are contingent upon prevailing LME lead
prices during the five-year period subsequent to the Potential ASARCO MLD
Acquisition. Specifically, Doe Run's obligations under the deferred purchase
price arrangement are determined annually and are only due if the annual LME
spot lead price exceeds $.285 per pound, with such payments not to exceed $12.5
million in the aggregate.
    
 
    The pro forma consolidated financial information has been prepared in
accordance with U.S. GAAP and should be read in conjunction with "Management's
Discussion and Analysis of Financial Condition and Results of Operations," the
audited financial statements of Doe Run, Doe Run Peru's Predecessor and the
ASARCO MLD, and the notes thereto, and the other financial information included
elsewhere herein. The unaudited pro forma consolidated financial data do not
purport to be indicative of the results which would have actually been obtained
had the Acquisition, the Transactions and the Potential ASARCO MLD Acquisition
been consummated on the dates indicated or which may be expected to occur in the
future.
 
                                       31
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
                 UNAUDITED PRO FORMA CONSOLIDATED BALANCE SHEET
 
                                 APRIL 30, 1998
 
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
   
<TABLE>
<CAPTION>
                                                                                     ADJUSTMENTS
                                                                                       FOR THE
                                                                                      POTENTIAL
                                                                                      ASARCO MLD
                                                                        HISTORICAL  ACQUISITION(A)    PRO FORMA
                                                                        ----------  --------------  -------------
<S>                                                                     <C>         <C>             <C>
                                                     ASSETS
Current assets:
    Cash..............................................................  $   12,142    $    3,000     $    15,142
    Trade accounts receivable, net of allowance for doubtful
      accounts........................................................      66,927        --              66,927
    Inventories.......................................................     100,867         9,500         110,367
    Prepaid expenses and other current assets.........................      29,543           357          29,900
                                                                        ----------       -------    -------------
      Total current assets............................................     209,479        12,857         222,336
  Property, plant and equipment, net..................................     205,867        46,233         252,100
  Special term deposit................................................     125,000        --             125,000
  Net deferred tax assets.............................................       9,145        --               9,145
  Other noncurrent assets, net........................................      17,387         2,143          19,530
                                                                        ----------       -------    -------------
      Total assets....................................................  $  566,878    $   61,233     $   628,111
                                                                        ----------       -------    -------------
                                                                        ----------       -------    -------------
                                      LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
  Short-term borrowings and current maturities of long-term debt......  $    5,895    $   --         $     5,895
  Accounts payable....................................................      50,725        --              50,725
  Accrued liabilities.................................................      42,783           727          43,510
  Net deferred tax liabilities........................................       9,467        --               9,467
                                                                        ----------       -------    -------------
    Total current liabilities.........................................     108,870           727         109,597
Long-term debt, less current maturities...............................     384,681        60,000         444,681
Postretirement benefits...............................................      12,608        --              12,608
Reclamation and environmental costs...................................      31,085           506          31,591
Other noncurrent liabilities..........................................      13,758        --              13,758
                                                                        ----------       -------    -------------
    Total liabilities.................................................     551,002        61,233         612,235
Shareholders' equity:
  Common stock, $.10 par value, 1,000 shares authorized, issued, and
    outstanding.......................................................      --            --             --
  Additional paid in capital..........................................       5,000        --               5,000
  Retained earnings...................................................      10,876        --              10,876
                                                                        ----------       -------    -------------
    Total shareholders' equity........................................      15,876        --              15,876
                                                                        ----------       -------    -------------
    Total liabilities and shareholders' equity........................  $  566,878    $   61,233     $   628,111
                                                                        ----------       -------    -------------
                                                                        ----------       -------    -------------
</TABLE>
    
 
                                       32
<PAGE>
            NOTES TO UNAUDITED PRO FORMA CONSOLIDATED BALANCE SHEET
 
                                 APRIL 30, 1998
 
(a) Represents the estimated purchase price allocation related to the Potential
    ASARCO MLD Acquisition and the related financing. This allocation is
    management's best estimate at this time and is subject to refinement at the
    closing date of the Potential ASARCO MLD Acquisition.
 
                                       33
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
            UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS
                        SIX MONTHS ENDED APRIL 30, 1998
                             (DOLLARS IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                                                 ADJUSTMENTS
                                                                                                   FOR THE
                                                           ADJUSTMENTS                            POTENTIAL
                                                             FOR THE                   ASARCO    ASARCO MLD    PRO FORMA
                                               HISTORICAL  TRANSACTIONS   PRO FORMA    MLD(A)    ACQUISITION  AS ADJUSTED
                                               ----------  ------------  -----------  ---------  -----------  -----------
<S>                                            <C>         <C>           <C>          <C>        <C>          <C>
Net sales....................................  $  343,405   $   --        $ 343,405   $  34,543   $  --        $ 377,948
Costs and expenses:
  Cost of sales..............................     283,105       --          283,105      29,801        (639)(b)    312,267
  Depletion, depreciation and amortization...      11,461       --           11,461       4,300      (1,052)(c)     14,709
  Selling, general and administrative
    expenses.................................      17,700       --           17,700       2,349      --           20,049
  Exploration expense........................       1,599       --            1,599      --          --            1,599
                                               ----------  ------------  -----------  ---------  -----------  -----------
    Total costs and expenses.................     313,865       --          313,865      36,450      (1,691)     348,624
                                               ----------  ------------  -----------  ---------  -----------  -----------
    Income from operations...................      29,540       --           29,540      (1,907)      1,691       29,324
 
Other income (expense):
  Interest expense...........................     (14,505)      (8,278)(d)    (22,783)    --         (3,554)(e)    (26,337)
  Interest income............................       2,359       --            2,359      --          --            2,359
  Other, net.................................        (635)      --             (635)     --          --             (635)
                                               ----------  ------------  -----------  ---------  -----------  -----------
                                                  (12,781)      (8,278)     (21,059)     --          (3,554)     (24,613)
 
    Income before income taxes and
      extraordinary item.....................      16,759       (8,278)       8,481      (1,907)     (1,863)       4,711
Income tax expense (benefit).................       5,761       (2,897)(f)      2,864      (100)     (1,220)(f)      1,544
                                               ----------  ------------  -----------  ---------  -----------  -----------
    Income (loss) before extraordinary
      item...................................  $   10,998   $   (5,381)   $   5,617   $  (1,807)  $    (643)   $   3,167
                                               ----------  ------------  -----------  ---------  -----------  -----------
                                               ----------  ------------  -----------  ---------  -----------  -----------
 
Other data:
    EBITDA(g)................................                             $  40,366                            $  43,398
</TABLE>
    
 
                            ------------------------
 
   
    In addition to the pro forma adjustments directly attributable to the
Potential ASARCO MLD Acquisition set forth above, the effect of the elimination
of ASARCO corporate overhead allocations, which would have decreased selling,
general and administrative expenses by $1.9 million for the six months ended
April 30, 1998, should be considered.
    
 
                                       34
<PAGE>
       NOTES TO UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS
                        SIX MONTHS ENDED APRIL 30, 1998
 
(a) Represents the historical results of operations of the ASARCO MLD for the
    period November 1, 1997 to April 30, 1998.
 
   
(b) Represents the difference between the salaries, wages and benefits reflected
    in the historical results of operations of the ASARCO MLD and those that
    would have been expensed under Doe Run's programs, into which substantially
    all of the employees of the ASARCO MLD will be enrolled, which is a
    condition of the Potential ASARCO MLD Acquisition pursuant to the Asset
    Purchase Agreement.
    
 
(c) Reflects the decrease in depreciation based upon allocating the effective
    purchase price to the fair value of the assets to be purchased in the
    Potential ASARCO MLD Acquisition.
 
   
(d) Pro forma interest expense reflects the elimination of historical interest
    expense due to the retirement of substantially all of the existing debt
    obligations. Interest expense, as adjusted, includes interest of $14.6
    million on the Old Notes, interest on the Back-to-Back Loan of $7.2 million
    and amortization of debt issuance costs totaling $1.0 million. The pro forma
    consolidated statement of operations does not reflect interest income on the
    Special Term Deposit of $7.0 million.
    
 
   
(e) Reflects incremental interest at 11.25% on debt obligations of $60.0 million
    to finance the Potential ASARCO MLD Acquisition of $3.4 million and
    amortization of related financing costs of $.2 million.
    
 
   
(f) Reflects the income tax effect of pro forma adjustments at, and adjusts the
    ASARCO MLD tax provision to, an assumed statutory tax rate of 35%.
    
 
   
(g) EBITDA is defined as net income (loss) before extraordinary item plus the
    sum of net interest expense, income taxes and depletion, depreciation and
    amortization. The trends of EBITDA generally follow the trends of operating
    income. See "Management's Discussion and Analysis of Financial Condition and
    Results of Operations" for a discussion of recent trends of operating
    income. Information regarding EBITDA is presented because management
    believes that certain investors use EBITDA as one measure of an issuer's
    ability to service its debt. EBITDA should not be considered an alternative
    to, or more meaningful than, operating income or cash flow as an indicator
    of an issuer's operating performance. EBITDA is not necessarily a measure of
    the funds available for debt service because such funds could be used to
    fund operating requirements or other expenditures required by the Company's
    business instead of debt service. Furthermore, caution should be used in
    comparing EBITDA to similarly titled measures of other companies as the
    definitions of these measures may vary.
    
 
                                       35
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
            UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS
                          YEAR ENDED OCTOBER 31, 1997
                             (DOLLARS IN THOUSANDS)
   
<TABLE>
<CAPTION>
                                                       DOE RUN       ADJUSTMENTS   ADJUSTMENTS
                                                       PERU'S          FOR THE       FOR THE                    ASARCO
                                      HISTORICAL   PREDECESSOR(A)    ACQUISITION   TRANSACTIONS   PRO FORMA     MLD(F)
                                      -----------  ---------------  -------------  ------------  -----------  -----------
<S>                                   <C>          <C>              <C>            <C>           <C>          <C>
Net sales...........................   $ 280,467      $ 429,313       $  --         $   --        $ 709,780    $  85,308
Costs and expenses:
  Cost of sales.....................     234,351        364,901          --             --          599,252       68,429
  Depletion, depreciation and
    amortization....................      14,718          5,623           1,119(b)      --           21,460        8,209
  Selling, general and
    administrative expenses.........      10,959         18,524          --             --           29,483        4,954
  Exploration expense...............       2,705         --              --             --            2,705       --
                                      -----------  ---------------  -------------  ------------  -----------  -----------
    Total costs and expenses........     262,733        389,048           1,119         --          652,900       81,592
                                      -----------  ---------------  -------------  ------------  -----------  -----------
    Income from operations..........      17,734         40,265          (1,119)        --           56,880        3,716
Other income (expense):
  Interest expense..................     (13,740)        (1,211)         --            (30,798)(c)    (45,749)     --
  Interest income...................          21         --              --             --               21       --
  Other, net........................         (37)          (863)         --             --             (900)      --
                                      -----------  ---------------  -------------  ------------  -----------  -----------
                                         (13,756)        (2,074)         --            (30,798)     (46,628)      --
    Income before income taxes and
      extraordinary item............       3,978         38,191          (1,119)       (30,798)      10,252        3,716
Income tax expense (benefit)........       4,331         11,513           1,518(d)     (10,779)(e)      6,583       (168)
                                      -----------  ---------------  -------------  ------------  -----------  -----------
    Income (loss) before
      extraordinary item............   $    (353)     $  26,678       $  (2,637)    $  (20,019)   $   3,669    $   3,884
                                      -----------  ---------------  -------------  ------------  -----------  -----------
                                      -----------  ---------------  -------------  ------------  -----------  -----------
  EBITDA(k).........................                                                              $  77,440
 
<CAPTION>
                                      ADJUSTMENTS
                                        FOR THE
                                       POTENTIAL
                                        ASARCO
                                          MLD       PRO FORMA
                                      ACQUISITION  AS ADJUSTED
                                      -----------  -----------
<S>                                   <C>          <C>
Net sales...........................   $  --        $ 795,088
Costs and expenses:
  Cost of sales.....................      (1,562)(g)    666,119
  Depletion, depreciation and
    amortization....................      (1,712)(h)     27,957
  Selling, general and
    administrative expenses.........      --           34,437
  Exploration expense...............      --            2,705
                                      -----------  -----------
    Total costs and expenses........      (3,274)     731,218
                                      -----------  -----------
    Income from operations..........       3,274       63,870
Other income (expense):
  Interest expense..................      (7,107)(i)    (52,856)
  Interest income...................      --               21
  Other, net........................      --             (900)
                                      -----------  -----------
                                          (7,107)     (53,735)
    Income before income taxes and
      extraordinary item............      (3,833)      10,135
Income tax expense (benefit)........         127(j)      6,542
                                      -----------  -----------
    Income (loss) before
      extraordinary item............   $  (3,960)   $   3,593
                                      -----------  -----------
                                      -----------  -----------
  EBITDA(k).........................                $  90,927
</TABLE>
    
 
                            ------------------------
 
   
    In addition to the pro forma adjustments directly attributable to the
Acquisition set forth above, the effect of the following on historical results
for the year ended October 31, 1997 should be considered: (i) an increase in
power costs associated with a market price contract negotiated in conjunction
with the Acquisition would have increased cost of sales by $9.6 million, (ii)
the elimination of $2.0 million of unusual personnel reduction costs related to
the privatization program and a decrease of $1.3 million in workers' profit
sharing expense as a result of such elimination would have decreased selling,
general and administrative expenses by $3.3 million and (iii) the elimination of
$3.2 million of costs related to the privatization program and $.1 million of
tax fines and penalties that would not have been incurred had the Acquisition
occurred on November 1, 1996 would have increased other, net by $3.3 million.
    
 
   
    In addition to the pro forma adjustments directly attributable to the
Potential ASARCO MLD Acquisition set forth above, the effect of the elimination
of ASARCO corporate overhead allocations, which would have decreased selling,
general and administrative expenses by $4.1 million for the year ended October
31, 1997, should be considered.
    
 
                                       36
<PAGE>
       NOTES TO UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS
                          YEAR ENDED OCTOBER 31, 1997
 
(a) Represents the historical results of operations for Doe Run Peru's
    Predecessor for the period from November 1, 1996 through October 23, 1997.
 
   
(b) Reflects the increase in depreciation and amortization, based upon
    allocating the effective purchase price to the fair values of the assets
    purchased in the Acquisition.
    
 
   
(c) Pro forma interest expense reflects the elimination of historical interest
    expense due to the retirement of substantially all of the existing debt
    obligations. Interest expense, as adjusted, includes interest of $29.1
    million on the Old Notes, interest on the Back-to-Back Loan of $14.5
    million, amortization of debt issuance costs totaling $2.0 million and $.1
    million on other obligations. The pro forma consolidated statement of
    operations does not reflect interest income on the Special Term Deposit of
    $14.1 million.
    
 
   
(d) Represents the income tax effects of the above adjustments at the U.S.
    statutory rate, which reduced income tax expense by $.4 million. The
    adjustment also reflects the incremental U.S. tax at a rate of 5% on the
    income before taxes of Doe Run Peru's Predecessor for the period from
    November 1, 1996 to October 23, 1997, which increased income tax expense by
    $1.9 million.
    
 
   
(e) Reflects the income tax effect of the pro forma adjustments at an assumed
    statutory tax rate of 35%.
    
 
   
(f) Represents the historical results of operations of the ASARCO MLD for the
    period from January 1, 1997 to December 31, 1997.
    
 
   
(g) Represents the difference between the salaries, wages and benefits reflected
    in the historical results of operations of the ASARCO MLD and those that
    would have been expensed under Doe Run's programs, into which substantially
    all of the employees of the ASARCO MLD will be enrolled, which is a
    condition of the Potential ASARCO MLD Acquisition pursuant to the Asset
    Purchase Agreement.
    
 
   
(h) Represents the decrease in depreciation based upon allocating the effective
    purchase price to the fair value of the assets to be purchased in the
    Potential ASARCO MLD Acquisition.
    
 
   
(i) Reflects incremental interest at 11.25% on debt obligations of $60.0 million
    to finance the Potential ASARCO MLD Acquisition of $6.8 million and
    amortization of related financing costs of $.3 million.
    
 
   
(j) Reflects the income tax effect of pro forma adjustments at, and adjusts the
    ASARCO MLD tax provision to, an assumed statutory rate of 35%.
    
 
   
(k) EBITDA is defined as net income (loss) before extraordinary item plus the
    sum of net interest expense, income taxes and depletion, depreciation and
    amortization. The trends of EBITDA generally follow the trends of operating
    income. See "Management's Discussion and Analysis of Financial Condition and
    Results of Operations" for a discussion of the recent trends of operating
    income. Information regarding EBITDA is presented because management
    believes that certain investors use EBITDA as one measure of an issuer's
    ability to service its debt. EBITDA should not be considered an alternative
    to, or more meaningful than, operating income or cash flow as an indicator
    of an issuer's operating performance. EBITDA is not necessarily a measure of
    the funds available for debt service because such funds could be used to
    fund operating requirements or other expenditures required by the Company's
    business instead of debt service. Furthermore, caution should be used in
    comparing EBITDA to similarly titled measures of other companies as the
    definitions of these measures may vary.
    
 
                                       37
<PAGE>
                SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA
 
    The following tables set forth historical financial data of (i) Doe Run's
predecessor ("Doe Run's Predecessor") as of and for the year ended October 31,
1993 and for the five months ended March 31, 1994, which have been derived from
Doe Run's Predecessor's unaudited consolidated financial statements, (ii) the
Company as of and for the seven months ended October 31, 1994 and as of and for
each of the three fiscal years ended October 31, 1997, which have been derived
from the Company's audited consolidated financial statements, and for the six
months ended April 30, 1997 and as of and for the three months ended April 30,
1998, which are unaudited, (iii) Doe Run Peru's Predecessor as of and for each
of the three fiscal years ended December 31, 1996 and for the period January 1,
1997 to October 23, 1997 (the date of consummation of the Acquisition), which
have been derived from Doe Run Peru's Predecessor's audited consolidated
financial statements, and for the period November 1, 1996 to October 23, 1997
and the six months ended April 30, 1997, which are unaudited, and (iv) Doe Run
Cayman as of and for the six months ended April 30, 1998, which are unaudited.
The information contained in this table should be read in conjunction with
"Unaudited Pro Forma Consolidated Financial Data," "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and the audited
financial statements of Doe Run and Doe Run Peru's Predecessor, and the notes
thereto, included elsewhere herein.
 
                     DOE RUN'S PREDECESSOR AND THE COMPANY
   
<TABLE>
<CAPTION>
                                             DOE RUN'S
                                           PREDECESSOR(A)                                  THE COMPANY
<S>                                   <C>          <C>          <C>          <C>        <C>        <C>        <C>        <C>
                                      --------------------------------------------------------------------------------------------
 
<CAPTION>
                                                      FIVE         SEVEN
                                         YEAR        MONTHS       MONTHS                                        SIX MONTHS ENDED
                                         ENDED        ENDED        ENDED         YEAR ENDED OCTOBER 31,            APRIL 30,
                                      OCTOBER 31,   MARCH 31,   OCTOBER 31,  -------------------------------  --------------------
                                        1993(B)       1994         1994        1995       1996       1997       1997       1998
                                      -----------  -----------  -----------  ---------  ---------  ---------  ---------  ---------
                                                                    (DOLLARS AND TONS IN THOUSANDS)
<S>                                   <C>          <C>          <C>          <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Net sales...........................   $ 121,101    $  70,668    $ 123,335   $ 225,143  $ 274,930  $ 280,467  $ 135,905  $ 343,405
Cost of sales.......................     140,107       65,511      102,582     180,398    215,489    234,351    108,478    283,105
Depletion, depreciation and
  amortization......................      22,515        8,808        6,251      12,486     13,654     14,718      7,323     11,461
Selling, general and administrative
  expenses..........................       8,243        3,295        4,360       8,405     10,079     10,959      5,804     17,700
Exploration expense.................       1,525          271          912       1,926      2,912      2,705      1,365      1,599
                                      -----------  -----------  -----------  ---------  ---------  ---------  ---------  ---------
Operating income (loss).............     (51,289)      (7,217)       9,230      21,928     32,796     17,734     12,935     29,540
Interest expense....................         206           65        8,375      14,361     14,348     13,740      7,568     14,505
Interest income.....................         404           31           12         140        113         21          2      2,359
Other income (expense)..............       1,684         (652)         151        (132)       355        (37)         6       (635)
                                      -----------  -----------  -----------  ---------  ---------  ---------  ---------  ---------
Income (loss) before income tax
  expense and extraordinary item....     (49,407)      (7,903)       1,018       7,575     18,916      3,978      5,375     16,759
Income tax expense..................      --           --            2,523       3,252      6,451      4,331      1,826      5,761
                                      -----------  -----------  -----------  ---------  ---------  ---------  ---------  ---------
Income (loss) before extraordinary
  item..............................     (49,407)      (7,903)      (1,505)      4,323     12,465       (353)     3,549     10,998
Extraordinary item net of income tax
  benefit...........................      --           --           --          --         --         (1,062)      (314)    (6,607)
                                      -----------  -----------  -----------  ---------  ---------  ---------  ---------  ---------
Net income (loss)...................   $ (49,407)   $  (7,903)   $  (1,505)  $   4,323  $  12,465  $  (1,415) $   3,235  $   4,391
                                      -----------  -----------  -----------  ---------  ---------  ---------  ---------  ---------
                                      -----------  -----------  -----------  ---------  ---------  ---------  ---------  ---------
 
FINANCIAL RATIOS AND OTHER DATA:
EBITDA(c)...........................   $ (27,090)   $     939    $  15,632   $  34,282  $  46,805  $  32,415  $  20,264  $  40,366
Capital expenditures................       9,487        2,146        1,599       5,377     10,534     13,476      4,145     10,908
Ratio of earnings to fixed
  charges(d)........................      --           --             1.13x       1.56x      2.28x      1.22x      1.60x      2.33x
</TABLE>
    
 
                                       38
<PAGE>
<TABLE>
<CAPTION>
                                              DOE RUN'S
                                            PREDECESSOR(A)                                  THE COMPANY
<S>                                    <C>          <C>          <C>          <C>        <C>        <C>        <C>        <C>
                                       --------------------------------------------------------------------------------------------
 
<CAPTION>
                                                       FIVE         SEVEN                                        SIX MONTHS ENDED
                                          YEAR        MONTHS       MONTHS
                                          ENDED        ENDED        ENDED         YEAR ENDED OCTOBER 31,            APRIL 30,
                                       OCTOBER 31,   MARCH 31,   OCTOBER 31,  -------------------------------  --------------------
                                         1993(B)       1994         1994        1995       1996       1997       1997       1998
                                       -----------  -----------  -----------  ---------  ---------  ---------  ---------  ---------
                                                                     (DOLLARS AND TONS IN THOUSANDS)
<S>                                    <C>          <C>          <C>          <C>        <C>        <C>        <C>        <C>
 
OTHER OPERATING DATA:
Average LME lead price per
  pound(e)...........................   $     .19    $     .21    $     .25   $     .28  $     .35  $     .29  $     .31  $     .25
Tons of primary lead metal sold......       169.2         92.4        134.5       218.0      228.9      245.1      117.5      170.1
Tons of secondary lead metal sold....        39.1         18.9         22.1        27.9       39.7       44.1       13.5       22.8
Tons of secondary lead metal
  tolled.............................        26.4         15.1         23.3        52.4       51.7       60.9       29.4       25.4
Tons of zinc concentrates sold.......        35.9         20.1         23.3        55.5       68.3       69.7       36.0       33.1
Tons of copper concentrates sold.....        17.5         11.9         15.5        23.9       31.3       26.6       12.8        9.5
Tons of copper metal sold............      --           --           --          --         --            0.8     --           35.2
Ounces of silver metal sold (in
  millions)..........................      --           --           --          --         --            0.1     --           13.0
Tons of zinc metal sold..............      --           --           --          --         --         --         --           39.7
Primary smelter lead tons per
  manshift(f)........................         2.0          2.0          2.0         2.1        2.2        2.4        2.5        2.6
</TABLE>
<TABLE>
<CAPTION>
                                                        DOE RUN'S
                                                      PREDECESSOR(A)                       THE COMPANY
<S>                                                   <C>            <C>        <C>        <C>        <C>        <C>
                                                      ----------------------------------------------------------------------
 
<CAPTION>
                                                          AS OF                  AS OF OCTOBER 31,
                                                       OCTOBER 31,   ------------------------------------------  AS OF APRIL
                                                          1993         1994       1995       1996       1997      30, 1998
                                                      -------------  ---------  ---------  ---------  ---------  -----------
                                                                              (DOLLARS IN THOUSANDS)
<S>                                                   <C>            <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
Cash................................................       --           --         --         --      $   8,943   $  12,142
Working capital.....................................    $  51,057    $  35,373  $  32,571  $  33,989     76,951     100,609
Property, plant and equipment, net..................      131,926      109,700    102,606    104,162    206,348     205,867
Total assets........................................      212,993      197,563    195,246    203,914    380,841     566,878
Total debt (including current portion)..............        4,952       98,834     90,645     82,791    234,740     390,576
Shareholders' equity................................      122,536        5,995     10,318     20,830     14,174      15,876
</TABLE>
 
                                       39
<PAGE>
                 DOE RUN PERU'S PREDECESSOR AND DOE RUN CAYMAN
   
<TABLE>
<CAPTION>
                                                                                                     DOE RUN
                                               DOE RUN PERU'S PREDECESSOR(G)                        CAYMAN(H)
                           -----------------------------------------------------------------------------------
<S>                        <C>        <C>        <C>        <C>          <C>          <C>          <C>
 
<CAPTION>
                                                              PERIOD       PERIOD
                                                            JANUARY 1,   NOVEMBER 1,
                               YEAR ENDED DECEMBER 31,        1997 TO      1996 TO    SIX MONTHS   SIX MONTHS
                           -------------------------------  OCTOBER 23,  OCTOBER 23,  ENDED APRIL  ENDED APRIL
                             1994       1995       1996        1997        1997(I)     30, 1997    30, 1998(J)
                           ---------  ---------  ---------  -----------  -----------  -----------  -----------
                                        (DOLLARS AND TONS IN THOUSANDS)
<S>                        <C>        <C>        <C>        <C>          <C>          <C>          <C>
STATEMENT OF OPERATIONS
  DATA:
Net sales................  $ 367,057  $ 450,929  $ 456,797   $ 352,805    $ 429,313    $ 217,731    $ 227,359
Cost of sales............    339,302    397,524    397,158     305,959      364,901      181,566      181,631
Depreciation and
  amortization...........      4,448      4,729      5,353       4,730        5,623        2,753        3,396
Selling, general and
  administrative
  expenses...............     11,097     15,950     17,420      13,805       18,524       10,112       16,870
                           ---------  ---------  ---------  -----------  -----------  -----------  -----------
Operating income.........     12,210     32,726     36,866      28,311       40,265       23,300       25,462
Interest expense.........      6,784      2,100      3,332         832        1,211          770        5,667
Interest income..........     --         --         --          --           --           --              456
Other income (expense)...       (402)    (1,798)   (23,517)     (1,217)        (863)      (1,438)        (362)
                           ---------  ---------  ---------  -----------  -----------  -----------  -----------
Income before income tax
  expense and
  extraordinary item.....      5,024     28,828     10,017      26,262       38,191       21,092       19,889
Income tax expense.......      2,803     10,332      4,128       7,879       11,513        6,382        6,668
Income before
  extraordinary item.....     --         --         --          --           --           14,710       13,221
Extraordinary item net of
  income tax benefit.....     --         --         --          --           --           --           (2,369)
                           ---------  ---------  ---------  -----------  -----------  -----------  -----------
Net income...............  $   2,221  $  18,496  $   5,889   $  18,383    $  26,678    $  14,710    $  10,852
                           ---------  ---------  ---------  -----------  -----------  -----------  -----------
                           ---------  ---------  ---------  -----------  -----------  -----------  -----------
OTHER DATA:
EBITDA(c)................  $  16,256  $  35,657  $  18,702   $  31,824    $  45,025    $  24,615    $  28,496
Adjusted EBITDA(k).......     16,256     38,161     47,716      36,514       50,190       27,906
 
OTHER OPERATING DATA:
Tons of lead metal
  sold...................       95.1       98.7      104.1        87.1        106.7         52.4         55.4
Tons of copper metal
  sold...................       65.6       70.0       71.3        56.7         68.9         35.7         35.2
Ounces of silver metal
  sold (in millions).....       18.5       19.6       21.2        17.3         20.4         10.0         13.0
Tons of zinc metal
  sold...................       72.6       74.3       77.6        58.4         71.0         35.4         39.7
Average LME copper price
  per pound..............  $    1.05  $    1.33  $    1.04   $    1.07    $    1.07    $    1.07    $     .80
Average LBMA silver price
  per ounce..............       5.28       5.20       5.10        4.77         4.79         4.90         5.96
Average LME zinc price
  per pound..............       0.45       0.47       0.47        0.61         0.59          .52          .50
</TABLE>
    
<TABLE>
<CAPTION>
                                                            DOE RUN PERU'S PREDECESSOR(G)      DOE RUN CAYMAN(H)
<S>                                                        <C>        <C>        <C>        <C>          <C>
                                                           ---------------------------------------------------------
 
<CAPTION>
                                                                 AS OF DECEMBER 31,            AS OF        AS OF
                                                           -------------------------------  OCTOBER 31,   APRIL 30,
                                                             1994       1995       1996        1997         1998
                                                           ---------  ---------  ---------  -----------  -----------
                                                               (DOLLARS IN THOUSANDS)
<S>                                                        <C>        <C>        <C>        <C>          <C>
BALANCE SHEET DATA:
Cash.....................................................  $      61  $      62  $     582   $   7,364    $  12,142
Working capital..........................................      6,081     54,208     44,319       7,713       50,415
Property, plant and equipment, net.......................     46,092     55,557     50,814      97,739       95,921
Total assets.............................................    146,482    188,474    148,314     170,969      223,219
Total debt (including current portion)...................     23,160     19,626     15,068     103,000      130,000
Net assets...............................................     51,481    107,667     78,575       1,729       12,581
</TABLE>
 
                                          (FOOTNOTES COMMENCE ON FOLLOWING PAGE)
 
                                       40
<PAGE>
(a) Doe Run was acquired by Renco effective as of April 1, 1994.
 
(b) Results for fiscal 1993 were affected by a strike at the Herculaneum smelter
    and curtailment of production at the Herculaneum smelter due to flooding of
    the Mississippi River. See "Management's Discussion and Analysis of Results
    of Operations and Financial Condition."
 
(c) EBITDA is defined as net income (loss) before extraordinary item plus the
    sum of net interest expense, income taxes and depletion, depreciation and
    amortization. The trends of EBITDA generally follow the trends of operating
    income. See "Management's Discussion and Analysis of Financial Condition and
    Results of Operations" for a discussion of the recent trends of operating
    income. Information regarding EBITDA is presented because management
    believes that certain investors use EBITDA as one measure of an issuer's
    historical ability to service its debt. EBITDA should not be considered an
    alternative to, or more meaningful than, operating income or cash flow as an
    indicator of an issuer's operating performance. EBITDA is not necessarily a
    measure of the funds available for debt service because such funds could be
    used to fund operating requirements or other expenditures required by the
    Company's business instead of debt service. Furthermore, caution should be
    used in comparing EBITDA to similarly titled measures of other companies as
    the definitions of these measures may vary.
 
   
(d) Fixed charges consist of interest expense net of interest income plus
    capitalized interest and the portion of rental expense that is
    representative of interest expense, less amortization of deferred financing
    costs. Earnings consist of income before income tax expense and
    extraordinary item plus fixed charges less capitalized interest.
    
 
(e) The average lead price per pound realized by Doe Run generally is at a
    premium over the average LME price.
 
(f) Primary smelter lead tons per manshift is computed by dividing metal
    produced at Doe Run by the shifts required to produce the related tons.
    Shifts are computed by dividing the sum of actual hours worked during the
    period for hourly employees and 12 hours per week for salaried employees by
    eight hours.
 
(g) Metaloroya was acquired by Doe Run Peru effective October 23, 1997.
 
(h) Doe Run Cayman, a wholly-owned subsidiary of Doe Run, is the parent company
    of Doe Run Mining and currently has no independent operations.
 
(i) Doe Run Cayman's net sales, operating income and EBITDA for the eight-day
    period October 23, 1997 to October 31, 1997 were $2.6 million, $.4 million
    and $.5 million, respectively.
 
(j) These results include intercompany transactions. Net sales, cost of sales
    and selling, general and administrative expenses excluding the effects of
    intercompany transactions were $224.9 million, $179.3 million and $9.1
    million, respectively.
 
(k) Adjusted EBITDA is defined as EBITDA adjusted for the following
    non-recurring charges: (i) for 1995, $2.5 million relating to personnel
    reduction costs, (ii) for 1996, $3.9 million relating to personnel reduction
    costs, $21.6 million relating to one-time environmental expenses and $3.6
    million relating to privatization costs, (iii) for the period January 1,
    1997 to October 23, 1997, $3.2 million relating to privatization costs and
    $1.5 million relating to personnel reduction costs, (iv) for the period
    November 1, 1996 to October 23, 1997, $3.2 million relating to privatization
    costs and $2.0 million relating to personnel reduction costs and (v) for the
    six months ended April 30, 1997, $2.0 million relating to privatization
    costs and $.5 million relating to personnel reduction costs.
 
                                       41
<PAGE>
                               THE EXCHANGE OFFER
 
TERMS OF THE EXCHANGE OFFER
 
  GENERAL
 
    In connection with the sale of Old Notes to the Initial Purchasers pursuant
to the Purchase Agreement, dated March 6, 1998, among Doe Run, the Guarantors
and the Initial Purchasers, the holders of the Old Notes became entitled to the
benefits of the Registration Rights Agreement.
 
    Under the Registration Rights Agreement, Doe Run became obligated to (a)
file a registration statement in connection with a registered exchange offer
within 60 days after the Issue Date, and (b) cause the registration statement
relating to such registered exchange offer to become effective within 150 days
after the Issue Date. The Exchange Offer being made hereby, if consummated
within the required time periods, will satisfy Doe Run's obligations under the
Registration Rights Agreement. Doe Run understands that there are approximately
    beneficial owners of such Old Notes. This Prospectus, together with the
Letter of Transmittal, is being sent to all such beneficial holders known to Doe
Run.
 
    Upon the terms and subject to the conditions set forth in this Prospectus
and in the accompanying Letter of Transmittal, Doe Run will accept all Old Notes
properly tendered and not withdrawn prior to 5:00 p.m., New York City time, on
the Expiration Date. Doe Run will issue $1,000 principal amount of Fixed Rate
Exchange Notes and Floating Rate Exchange Notes in exchange for each $1,000
principal amount of outstanding Fixed Rate Old Notes and Floating Rate Old
Notes, respectively, accepted in the Exchange Offer. Holders may tender some or
all of their Old Notes pursuant to the Exchange Offer.
 
    Based on an interpretation by the staff of the Commission set forth in the
Morgan Stanley Letter, the Exxon Capital Letter and similar letters, Doe Run
believes that Exchange Notes issued pursuant to the Exchange Offer in exchange
for Old Notes may be offered for resale, resold and otherwise transferred by any
person who received such Exchange Notes, whether or not such person is the
holder (other than Restricted Holders) without compliance with the registration
and prospectus delivery provisions of the Securities Act, provided that such
Exchange Notes are acquired in the ordinary course of such holder's or other
person's business, neither such holder nor such other person is engaged in or
intends to engage in any distribution of the Exchange Notes and such holders or
other persons have no arrangement or understanding with any person to
participate in the distribution of such Exchange Notes.
 
    If any person were to be participating in the Exchange Offer for the
purposes of participating in a distribution of the Exchange Notes in a manner
not permitted by the Commission's interpretation, such person (a) could not rely
upon the Morgan Stanley Letter, the Exxon Capital Letter or similar letters and
(b) must comply with the registration and prospectus delivery requirements of
the Securities Act in connection with a secondary resale transaction.
 
    Each broker-dealer that receives Exchange Notes for its own account in
exchange for Old Notes, where such Old Notes were acquired by such broker-dealer
as a result of market-making or other trading activities, must acknowledge that
it will deliver a prospectus in connection with any resale of such Exchange
Notes. The Letter of Transmittal states that by so acknowledging and by
delivering a prospectus, a broker-dealer will not be deemed to admit that it is
an "underwriter" within the meaning of the Securities Act. This Prospectus, as
it may be amended or supplemented from time to time, may be used by a
broker-dealer in connection with resales of Exchange Notes received in exchange
for Old Notes where such Old Notes were acquired by such broker-dealer as result
of market-making activities or other trading activities. Doe Run has agreed
that, for a period of 180 days after consummation of the Exchange Offer, it will
make this Prospectus, which Doe Run will update, amend or supplement from time
to time as required by applicable law or regulations, available to any
broker-dealer for use in connection with any such resale. See "Plan of
Distribution."
 
                                       42
<PAGE>
    Doe Run will not receive any proceeds from the Exchange Offer. See "Use of
Proceeds." Doe Run has agreed to bear the expenses of the Exchange Offer
pursuant to the Registration Rights Agreement. No underwriter is being used in
connection with the Exchange Offer.
 
    Doe Run shall be deemed to have accepted validly tendered Old Notes when, as
and if Doe Run has given oral or written notice thereof to the Exchange Agent.
The Exchange Agent will act as agent for the tendering holders of Old Notes for
the purposes of receiving the Exchange Notes from Doe Run and delivering
Exchange Notes to such holders.
 
    If any tendered Old Notes are not accepted for exchange because of an
invalid tender or the occurrence of certain conditions set forth herein under
"--Conditions" without waiver by Doe Run, certificates for any such unaccepted
Old Notes will be returned, without expense, to the tendering holder thereof as
promptly as practicable after the Expiration Date.
 
    Holders of Old Notes who tender in the Exchange Offer will not be required
to pay brokerage commissions or fees or, subject to the instructions in the
Letter of Transmittal, transfer taxes with respect to the exchange of Old Notes
pursuant to the Exchange Offer. Doe Run will pay all charges and expenses, other
than certain applicable taxes in connection with the Exchange Offer. See "--Fees
and Expenses."
 
    In the event the Exchange Offer is consummated, Doe Run will not be required
to register the Old Notes. In such event, holders of Old Notes seeking liquidity
in their investment would have to rely on exemptions to registration
requirements under the securities laws, including the Securities Act. See "Risk
Factors--Consequences of Failure to Exchange."
 
  EXPIRATION DATE; EXTENSIONS; AMENDMENT
 
    The term "Expiration Date" shall mean the expiration date set forth on the
cover page of this Prospectus, unless Doe Run, in its sole discretion, extends
the Exchange Offer, in which case the term "Expiration Date" shall mean the
latest date to which the Exchange Offer is extended.
 
    In order to extend the Expiration Date, Doe Run will notify the Exchange
Agent of any extension by oral or written notice and will issue a public
announcement thereof, each prior to 9:00 a.m., New York City time, on the next
business day after the previously scheduled Expiration Date. Such announcement
may state that Doe Run is extending the Exchange Offer for a specified period of
time.
 
    Doe Run reserves the right (a) to delay accepting any Old Notes, to extend
the Exchange Offer or to terminate the Exchange Offer and not accept Old Notes
not previously accepted if any of the conditions set forth herein under
"--Conditions" shall have occurred and shall not have been waived by Doe Run (if
permitted to be waived by Doe Run), by giving oral or written notice of such
delay, extension or termination to the Exchange Agent, or (b) to amend the terms
of the Exchange Offer in any manner deemed by it to be advantageous to the
holders of the Old Notes. Any such delay in acceptance, extension, termination
or amendment will be followed as promptly as practicable by oral or written
notice thereof. If the Exchange Offer is amended in a manner determined by Doe
Run to constitute a material change, Doe Run will promptly disclose such
amendment in a manner reasonably calculated to inform the holders of the Old
Notes of such amendment, and Doe Run may extend the Exchange Offer for a period
of up to ten business days, depending upon the significance of the amendment and
the manner of disclosure to holders of the Old Notes, if the Exchange Offer
would otherwise expire during such extension period.
 
    Without limiting the manner in which Doe Run may choose to make public
announcement of any extension, amendment or termination of the Exchange Offer,
Doe Run shall have no obligation to publish, advertise, or otherwise communicate
any such public announcement, other than by making a timely release to the Dow
Jones News Service.
 
                                       43
<PAGE>
INTEREST ON THE EXCHANGE NOTES
 
    The Exchange Notes will bear interest from March 12, 1998, payable
semiannually on March 15 and September 15 of each year, commencing September 15,
1998, at the rate of 11 1/4% per annum in the case of the Fixed Rate Exchange
Notes and at a rate per annum equal to LIBOR plus 6.29% in the case of the
Floating Rate Exchange Notes. Interest on the Floating Rate Exchange Notes will
be reset semi-annually. Holders of Old Notes whose Old Notes are accepted for
exchange will be deemed to have waived the right to receive any payment in
respect of interest on the Old Notes accrued up until the date of the issuance
of the Exchange Notes.
 
PROCEDURES FOR TENDERING
 
    To tender in the Exchange Offer, a holder must complete, sign and date the
Letter of Transmittal, or a facsimile thereof, have the signatures thereon
guaranteed if required by instruction 3 of the Letter of Transmittal, and mail
or otherwise deliver such Letter of Transmittal or such facsimile, together with
the Old Notes and any other required documents. To be validly tendered, such
documents must reach the Exchange Agent on or before 5:00 p.m., New York City
time, on the Expiration Date.
 
    The tender by a holder of Old Notes will constitute an agreement between
such holder and Doe Run in accordance with the terms and subject to the
conditions set forth herein and in the Letter of Transmittal.
 
    Delivery of all documents must be made to the Exchange Agent at its address
set forth below. Holders may also request their respective brokers, dealers,
commercial banks, trust companies or other nominees to effect such tender for
such holders.
 
    The method of delivery of Old Notes and the Letter of Transmittal and all
other required documents to the Exchange Agent is at the election and risk of
the holders. Instead of delivery by mail, it is recommended that holders use an
overnight or hand delivery service. In all cases, sufficient time should be
allowed to assure timely delivery to the Exchange Agent on or before 5:00 p.m.
New York City time, on the Expiration Date. No Letter of Transmittal or Old
Notes should be sent to Doe Run or the Guarantors.
 
    Only a holder of Old Notes may tender such Old Notes in the Exchange Offer.
The term "holder" with respect to the Exchange Offer means any person in whose
name Old Notes are registered on the books of Doe Run or any other person who
has obtained a properly completed bond power from the registered holder.
 
    Any beneficial holder whose Old Notes are registered in the name of his
broker, dealer, commercial bank, trust company or other nominee and who wishes
to tender should contact such registered holder promptly and instruct such
registered holder to tender on his behalf. If such beneficial holder wishes to
tender on his own behalf, such registered holder must, prior to completing and
executing the Letter of Transmittal and delivering his Old Notes, either make
appropriate arrangements to register ownership of the Old Notes in such holder's
name or obtain a properly completed bond power from the registered holder. The
transfer of record ownership may take considerable time.
 
    Signatures on a Letter of Transmittal or a notice of withdrawal, as the case
may be, must be guaranteed by a member firm of a registered national securities
exchange or of the National Association of Securities Dealers, Inc. or a
commercial bank or trust company having an office or correspondent in the United
States (an "Eligible Institution") unless the Old Notes tendered pursuant
thereto are tendered (a) by a registered holder who has not completed the box
entitled "Special Issuance Instructions" or "Special Delivery Instructions" on
the Letter of Transmittal or (b) for the account of an Eligible Institution. In
the event that signatures on a Letter of Transmittal or a notice of withdrawal,
as the case may be, are required to be guaranteed, such guarantee must be by an
Eligible Institution.
 
    If the Letter of Transmittal is signed by a person other than the registered
holder of any Old Notes listed therein, such Old Notes must be endorsed or
accompanied by appropriate bond powers and a proxy
 
                                       44
<PAGE>
which authorizes such person to tender the Old Notes on behalf of the registered
holder, in each case signed as the name of the registered holder or holders
appears on the Old Notes.
 
    If the Letter of Transmittal or any Old Notes or bond powers are signed by
trustees, executors, administrators, guardians, attorneys-in-fact, officers of
corporations or others acting in a fiduciary or representative capacity, such
persons should so indicate when signing, and unless waived by Doe Run, evidence
satisfactory to Doe Run of their authority so to act must be submitted with the
Letter of Transmittal.
 
    All questions as to the validity, form, eligibility (including time of
receipt), and withdrawal of the tendered Old Notes will be determined by Doe Run
in its sole discretion, which determination will be final and binding. Doe Run
reserves the absolute right to reject any and all Old Notes not properly
tendered or any Old Notes Doe Run's acceptance of which would, in the opinion of
counsel for Doe Run, be unlawful. Doe Run also reserves the right to waive any
irregularities or conditions of tender as to particular Old Notes. Doe Run's
interpretation of the terms and conditions of the Exchange Offer (including the
instructions in the Letter of Transmittal) will be final and binding on all
parties. Unless waived, any defects or irregularities in connection with tenders
of Old Notes must be cured within such time as Doe Run shall determine. None of
Doe Run, the Guarantors, the Exchange Agent or any other person shall be under
any duty to give notification of defects or irregularities with respect to
tenders of Old Notes, nor shall any of them incur any liability for failure to
give such notification. Tenders of Old Notes will not be deemed to have been
made until such irregularities have been cured or waived. Any Old Notes received
by the Exchange Agent that are not properly tendered and as to which the defects
or irregularities have not been cured or waived will be returned without cost to
such holder by the Exchange Agent to the tendering holders of Old Notes, unless
otherwise provided in the Letter of Transmittal, as soon as practicable
following the Expiration Date.
 
    In addition, Doe Run reserves the right in its sole discretion to (a)
purchase or make offers for any Old Notes that remain outstanding subsequent to
the Expiration Date or, as set forth under "-- Conditions," to terminate the
Exchange Offer in accordance with the terms of the Registration Rights Agreement
and (b) to the extent permitted by applicable law, purchase Old Notes in the
open market, in privately negotiated transactions or otherwise. The terms of any
such purchases or offers will differ from the terms of the Exchange Offer.
 
    By tendering, each holder will represent to Doe Run that, among other
things, (a) the Exchange Notes acquired pursuant to the Exchange Offer are being
obtained in the ordinary course of business of such holder or other person, (b)
neither such holder nor such other person is engaged in or intends to engage in
a distribution of the Exchange Notes (c) neither such holder or other person has
any arrangement or understanding with any person to participate in the
distribution of such Exchange Notes, and (d) such holder or other person is not
an "affiliate," as defined under Rule 405 of the Securities Act, of Doe Run or,
if such holder or other person is such an affiliate, will comply with the
registration and prospectus delivery requirements of the Securities Act to the
extent applicable.
 
    Each broker-dealer that receives Exchange Notes for its own account in
exchange for Old Notes, where such Old Notes were acquired by such broker-dealer
as a result of market-making or other trading activities, must acknowledge that
it will deliver a prospectus in connection with any resale of such Exchange
Notes. The Letter of Transmittal states that by so acknowledging and by
delivering a prospectus, a broker-dealer will not be deemed to admit that it is
an "underwriter" within the meaning of the Securities Act. This Prospectus, as
it may be amended or supplemented from time to time, may be used by a
broker-dealer in connection with resales of Exchange Notes received in exchange
for Old Notes where such Old Notes were acquired by such broker-dealer as result
of market-making activities or other trading activities. Doe Run has agreed
that, for a period of 180 days after consummation of the Exchange Offer, it will
make this Prospectus, which Doe Run will update, amend or supplement from time
to time as required
 
                                       45
<PAGE>
by applicable law or regulations, available to any broker-dealer for use in
connection with any such resale. See "Plan of Distribution."
 
    Doe Run will not receive any proceeds from the Exchange Offer. See "Use of
Proceeds." Doe Run has agreed to bear the expenses of the Exchange Offer
pursuant to the Registration Rights Agreement. No underwriter is being used in
connection with the Exchange Offer.
 
    The Old Notes were issued on March 12, 1998 and there is no public market
for them at present. To the extent Old Notes are tendered and accepted in the
Exchange Offer, the principal amount of outstanding Old Notes will decrease with
a resulting decrease in the liquidity in the market therefor. Following the
consummation of the Exchange Offer, holders of Old Notes will continue to be
subject to certain restrictions on transfer. Accordingly, the liquidity of the
market for the Old Notes could be adversely affected.
 
GUARANTEED DELIVERY PROCEDURES
 
    Holders who wish to tender their Old Notes and (a) whose Old Notes are not
immediately available or (b) who cannot deliver their Old Notes, the Letter of
Transmittal or any other required documents to the Exchange Agent prior to the
Expiration Date, may effect a tender if: (i) the tender is made through an
Eligible Institution; (ii) prior to the Expiration Date, the Exchange Agent
receives from such Eligible Institution a properly completed and duly executed
Notice of Guaranteed Delivery (by facsimile transmission, mail or hand delivery)
setting forth the name and address of the holder of the Old Notes, the
certificate number or numbers of such Old Notes and the principal amount of Old
Notes tendered, stating that the tender is being made thereby, and guaranteeing
that, within three business days after the Expiration Date, the Letter of
Transmittal (or facsimile thereof) together with the certificate(s) representing
the Old Notes to be tendered in proper form for transfer and any other documents
required by the Letter of Transmittal will be deposited by the Eligible
Institution with the Exchange Agent; and (iii) such properly completed and
executed Letter of Transmittal (or facsimile thereof) together with the
certificate(s) representing all tendered Old Notes in proper form for transfer
and all other documents required by the Letter of Transmittal are received by
the Exchange Agent within three business days after the Expiration Date.
 
WITHDRAWAL OF TENDERS
 
    Except as otherwise provided herein, tenders of Old Notes may be withdrawn
at any time prior to 5:00 p.m., New York City time, on the Expiration Date,
unless previously accepted for exchange.
 
    To withdraw a tender of Old Notes in the Exchange Offer, a written or
facsimile transmission notice of withdrawal must be received by the Exchange
Agent at its address set forth herein prior to 5:00 p.m., New York City time, on
the Expiration Date. Any such notice of withdrawal must (a) specify the name of
the person having deposited the Old Notes to be withdrawn (the "Depositor"), (b)
identify the Old Notes to be withdrawn (including the certificate number or
numbers and principal amount of such Old Notes), (c) be signed by the Depositor
in the same manner as the original signature on the Letter of Transmittal by
which such Old Notes were tendered (including any required signature guarantees)
or be accompanied by documents of transfer sufficient to have the Trustee with
respect to the Old Notes register the transfer of such Old Notes into the name
of the Depositor withdrawing the tender and (d) specify the name in which any
such Old Notes are to be registered, if different from that of the Depositor.
All questions as to the validity, form and eligibility (including time of
receipt) of such withdrawal notices will be determined by Doe Run, whose
determination shall be final and binding on all parties. Any Old Notes so
withdrawn will be deemed not to have been validly tendered for purposes of the
Exchange Offer and no Exchange Notes will be issued with respect thereto unless
the Old Notes so withdrawn are validly retendered. Any Old Notes which have been
tendered but which are not accepted for exchange will be returned to the holder
thereof without cost to such holder as soon as practicable after withdrawal,
rejection of tender or
 
                                       46
<PAGE>
termination of the Exchange Offer. Properly withdrawn Old Notes may be
retendered by following one of the procedures described above under
"--Procedures for Tendering" at any time prior to the Expiration Date.
 
CONDITIONS
 
   
    Notwithstanding any other term of the Exchange Offer, Doe Run will not be
required to accept for exchange, or exchange Exchange Notes for, any Old Notes
not theretofore accepted for exchange, and may terminate or amend the Exchange
Offer as provided herein before the acceptance of such Old Notes, if Doe Run or
the holders of at least a majority in principal amount of Old Notes reasonably
determine in good faith that any of the following conditions exist: (a) the
Exchange Notes to be received by such holders of Old Notes in the Exchange
Offer, upon receipt, will not be tradable by each such holder (other than a
holder which is an affiliate of Doe Run at any time on or prior to the
consummation of the Exchange Offer) without restriction under the Securities Act
and the Exchange Act and without material restrictions under the blue sky or
securities laws of substantially all of the states of the United States or (b)
the interests of the holders of the Old Notes, taken as a whole, would be
materially adversely affected by the consummation of the Exchange Offer.
    
 
    Pursuant to the Registration Rights Agreement, if an Exchange Offer shall
not be consummated prior to the Exchange Offer Termination Date, Doe Run will be
obligated to cause to be filed with the Commission a shelf registration
statement with respect to the Old Notes (the "Shelf Registration Statement") as
promptly as practicable after the Exchange Offer Termination Date and thereafter
use its best efforts to have the Shelf Registration Statement declared
effective.
 
    If any of the conditions described above exist, Doe Run will refuse to
accept any Old Notes and will return all tendered Old Notes to exchanging
holders of the Old Notes.
 
EXCHANGE AGENT
 
    State Street Bank and Trust Company has been appointed as Exchange Agent for
the Exchange Offer. Questions and requests for assistance and requests for
additional copies of this Prospectus or of the Letter of Transmittal and
deliveries of completed Letters of Transmittal with tendered Old Notes should be
directed to the Exchange Agent addressed as follows:
 
<TABLE>
<S>                                            <C>
                   BY MAIL                              BY HAND/OVERNIGHT DELIVERY
     State Street Bank and Trust Company            State Street Bank and Trust Company
     Two International Place, 4th Floor                   61 Broadway, 15th Floor
         Boston, Massachusetts 02110                     New York, New York 10006
  Attention: Claire Young--Corporate Trust         Attention: Corporate Trust Department
                 Department
</TABLE>
 
    Doe Run will indemnify the Exchange Agent and its agents for any loss,
liability or expense incurred by them, including reasonable costs and expenses
of their defense, except for any such loss, liability or expense caused by
negligence or bad faith.
 
FEES AND EXPENSES
 
    The expenses of soliciting tenders pursuant to the Exchange Offer will be
borne by Doe Run. The principal solicitation for tenders pursuant to the
Exchange Offer is being made by mail. Additional solicitations may be made by
officers and regular employees of Doe Run and its affiliates in person, by
telephone or facsimile.
 
    Doe Run will not make any payments to brokers, dealers, or other persons
soliciting acceptances of the Exchange Offer. Doe Run, however, will pay the
Exchange Agent reasonable and customary fees for its
 
                                       47
<PAGE>
services and will reimburse the Exchange Agent for its reasonable out-of-pocket
expenses in connection therewith. Doe Run may also pay brokerage houses and
other custodians, nominees and fiduciaries the reasonable out-of-pocket expenses
incurred by them in forwarding copies of this Prospectus, Letters of Transmittal
and related documents to the beneficial owners of the Old Notes, and in handling
or forwarding tenders for exchange.
 
    The expenses to be incurred in connection with the Exchange Offer, including
fees and expenses of the Exchange Agent and Trustee and accounting and legal
fees and expenses, will be paid by Doe Run, and are estimated in the aggregate
to be approximately $500,000.
 
    Doe Run will pay all transfer taxes, if any, applicable to the exchange of
Old Notes pursuant to the Exchange Offer. If, however, certificates representing
Exchange Notes (or Old Notes for principal amounts not tendered or accepted for
exchange) are to be delivered to, or are to be registered or issued in the name
of, any person other than the registered holder of the Old Notes tendered, or if
tendered Old Notes are registered in the name of any person other than the
person signing the Letter of Transmittal, or if a transfer tax is imposed for
any reason other than the exchange of Old Notes pursuant to the Exchange Offer,
then the amount of any such transfer taxes (whether imposed on the registered
holder or any other persons) will be payable by the tendering holder. If
satisfactory evidence of payment of such taxes or exemption therefrom is not
submitted with the Letter of Transmittal, the amount of such transfer taxes will
be billed directly to such tendering holder.
 
ACCOUNTING TREATMENT
 
    Doe Run will not recognize any gain or loss for accounting purposes upon the
consummation of the Exchange Offer. The expense of the Exchange Offer will be
amortized by Doe Run over the term of the Exchange Notes under U.S. GAAP.
 
                                       48
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
    Doe Run is the largest fully-integrated lead producer in North America and
the second largest primary lead producer in the western world. Renco acquired
Doe Run on April 1, 1994. Through its subsidiary Doe Run Peru, Doe Run operates
one of the largest polymetallic processing companies in the world offering an
extensive product mix of non-ferrous and precious metals, including copper,
silver, lead, zinc and gold. Doe Run acquired Doe Run Peru on October 23, 1997.
The combined capabilities of Doe Run and Doe Run Peru represent the largest
primary lead producer in the western world.
 
    The following discussion and analysis of Doe Run and Doe Run Peru should be
read in conjunction with the historical and pro forma financial statements of
Doe Run and Doe Run Peru, and the notes thereto, and other financial information
included elsewhere herein.
 
DOE RUN
 
    Doe Run is engaged in exploration, development, mining and processing of
base metals, primarily lead, and recycling of spent lead-acid batteries and
other lead-bearing materials. Doe Run also fabricates and repairs lead-lined
process equipment and lead products used in radiation shieldings, pollution
control devices and medical equipment, and produces lead oxide for use in
automotive batteries.
 
    Doe Run's principal product, refined lead, is actively quoted and traded on
the LME. The LME provides an efficient and orderly market on which to trade lead
and other non-ferrous metals. The market provides reference prices for worldwide
pricing of activities relating to non-ferrous metals and provides for storage
facilities to enable market participants to make or take physical delivery of
approved brands of metals, such as Doe Run lead. Lead options and futures are
also traded on the LME which enable participants to hedge against risks arising
from price fluctuations.
 
    During fiscal 1993, Doe Run experienced certain non-recurring events, which
contributed to Doe Run's operating losses during this period. Beginning in July
1992, Doe Run experienced a 29-month labor strike at its primary smelter.
Although Doe Run was able to keep the smelter operational and satisfy most of
its obligations during the strike by utilizing salaried employees from
throughout Doe Run, as well as outside contractors, metal output fell
significantly short of planned levels. Despite lower production levels,
operating expenses increased due to substantially increased security costs and
outside services. These factors combined to increase the conversion cost per ton
of metal by approximately 25%. In July and August 1993, flooding of the
Mississippi River caused Doe Run to shut down the Herculaneum smelter, thereby
reducing fiscal 1993 production by approximately 10%. During the shut down, Doe
Run continued to incur full production level costs.
 
    In addition to the non-recurring events at Doe Run, Doe Run's results of
operations were adversely affected by lower lead prices for a portion of the
period from 1993 to 1994. These lower lead prices were primarily a result of an
increased supply of lead due to increased net exports of lead from Eastern
Europe, the former Soviet Union and China. See "Industry--Lead."
 
    Subsequent to these events and its acquisition by Renco in April 1994, Doe
Run undertook various changes to improve profitability under all market
conditions and diversify its revenue sources. Specifically, as part of its
program to improve profitability, Doe Run has increased production at both its
Herculaneum and Buick smelting facilities. Primary lead production at
Herculaneum grew from approximately 162,000 tons per year in fiscal 1993 to
approximately 241,000 tons in fiscal 1997, while secondary production at Buick
grew from approximately 66,000 tons per year in fiscal 1993 to approximately
102,000 tons in fiscal 1997. Recent blast furnace productivity improvements have
increased the annual production capacity at Herculaneum from the original
capacity of approximately 225,000 tons to approximately 250,000 tons presently.
Increased production capacity enables Doe Run to lower unit costs by better
leveraging its fixed cost base.
 
                                       49
<PAGE>
    In recent years, Doe Run has made two strategic acquisitions of lead
fabrication operations. Margins on these products are relatively insensitive to
lead price fluctuations as Doe Run is generally able to reflect such
fluctuations in the price of the end product. In addition, Doe Run has a growing
tolling business with major U.S. lead-acid battery manufacturers pursuant to
contractual agreements under which recycled lead is returned to the supplier in
exchange for a processing fee which is largely independent of lead prices.
 
    The average LME price for refined lead was $.29 per pound in fiscal 1997. As
of March 31, 1998, the LME price for lead was $.26 per pound, which was below
the ten-year average price of $.28 per pound. Management believes that lead
prices will remain relatively stable or will modestly increase for the remainder
of fiscal 1998 and over the long term will reach historical industry averages.
As a result of the recent lead price decreases, the Company expects that it will
incur an operating loss in its U.S. operations that will adversely affect its
EBITDA in fiscal 1998.
 
  RESULTS OF OPERATIONS
 
    SIX MONTHS ENDED APRIL 30, 1998 COMPARED TO SIX MONTHS ENDED APRIL 30, 1997
 
    NET SALES for the six months ended April 30, 1998 (the "1998 period") were
$343.4 million compared to $135.9 million for the six months ended April 30,
1997 period (the "1997 period"). Of this increase, $224.9 million is
attributable to the addition of Doe Run Peru resulting from the Acquisition on
October 23, 1997. See "Doe Run Peru--Results of Operations." Lead metal net
sales decreased 9.1% from $88.7 million in the 1997 period to $80.6 million in
the 1998 period. An increase in sales volume of 6,473 tons, or 4.9%, added $4.4
million to net sales. The volume increase was offset by a $12.5 million decrease
due to lower realized prices for lead metal. The average LME price for lead
metal for the 1998 period decreased $.0622 per pound, or 20.1%, from the 1997
period. As a result, Doe Run's net realized price was 13.4% lower in the 1998
period compared to the 1997 period (realized prices are net of hedge
transactions; see "--Liquidity and Capital Resources--Hedging Activities").
Copper concentrate net sales were lower by $2.4 million, or 53.3%, in the 1998
period compared to the 1997 period due to a 3,312 ton, or a 25.9%, decrease in
volume and a 37.0% decrease in net realized price. The volume decrease is
primarily due to lower production resulting from a focus on lead, rather than
copper, production. The net realized price decrease is the result of a $.2701
per pound, or 25.2%, decrease in the LME average price of copper. Net sales of
the smelter by-product, kettle dross, were lower by $2.2 million in the 1998
period compared to the 1997 period. Lower volumes of kettle dross accounted for
$1.3 million of the decrease, as improved refined metal recovery and increased
recycling of dross material resulted in less kettle dross available for sale.
Decreased realized prices due to lower lead and copper prices accounted for the
remaining $.9 million of the decrease in kettle dross sales. Sales by Seafab
were $3.7 million lower in the 1998 period compared to the 1997 period,
primarily as a result of the planned relocation of the fabrication plant from
Seattle, Washington to Casa Grande, Arizona and the related startup. A slowdown
in oxide sales due to lower battery demand also contributed to the reduction in
sales by Seafab.
 
    COST OF SALES for the 1998 period was $283.1 million compared to $108.5
million for the 1997 period. Of this increase, $179.3 million is attributable to
the addition of Doe Run Peru. See "--Doe Run Peru-- Results of Operations."
Increased volume of lead metal offset by lower zinc, copper and lead concentrate
and toll volumes accounted for $.7 million of the cost increase. The cost of
purchased lead concentrates and higher costs for salaries and fringes and
purchased feed were offset by reduced spending on purchased services, purchased
lead metal and materials and supplies, and the impact of an 8.9% increase in
lead metal production volume. As a result, the average cost per ton produced was
approximately 0.8% lower in the 1998 period, compared to the 1997 period,
reducing cost of sales by $3.3 million from the 1997 period. Lower volume at
Seafab, primarily related to the relocation of the fabrication plant reduced
cost of sales by $2.8 million. The sales of imported zinc metal increased cost
of sales by $1.8 million.
 
    DEPLETION, DEPRECIATION AND AMORTIZATION for the 1998 period increased by
$4.1 million compared to the 1997 period. The addition of Doe Run Peru accounted
for $3.4 million of the increase. See "--Doe Run
 
                                       50
<PAGE>
Peru--Results of Operations." The remainder of the increase is primarily due to
depreciation of plant and equipment on recent capital additions.
 
    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES increased by $11.9 million for
the 1998 period compared to the 1997 period. The addition of Doe Run Peru
accounted for an increase of $9.1 million. See "--Doe Run Peru--Results of
Operations." The remainder of the increase in the 1998 period is primarily the
result of increases in general and administrative, expenses associated with the
Acquisition of Doe Run Peru and associated financing discussed above.
 
    EXPLORATION EXPENSE for the 1998 period increased $.2 million, or 14.3%,
compared to the 1997 period, due to increased drilling and pre-development
activities on potential mineral properties.
 
    OPERATING INCOME for the 1998 period was $29.5 million compared to $12.9
million for the 1997 period. Doe Run Peru added $33.2 million, which increase
was offset by a $3.7 million decrease at Doe Run attributable to the factors
discussed above. See "--Doe Run Peru--Results of Operations." The reminder of
the increase is due to the factors discussed above.
 
    INTEREST EXPENSE for the 1998 period was $14.5 million compared to $7.6
million for the 1997 period. The increase was primarily due to the increase in
indebtedness associated with the Acquisition and the Transactions.
 
    INTEREST INCOME for the 1998 period increased $2.4 million from the 1997
period, primarily due to interest income on the $125.0 million Special Term
Deposit.
 
    INCOME TAX EXPENSE Doe Run Peru's income tax expense is provided for on the
"separate return method," which assumes that Doe Run Peru, on a stand-alone
basis, would not file a return in the United States. Doe Run Peru's provision,
therefore, reflects the Peruvian statutory rate of 30%. Differences between the
effective rate and the statutory rate are due primarily to book losses of Doe
Run Peru subsidiaries that are not deductible for Peruvian income taxes. Due to
the fact that the Company files a consolidated return and has elected to include
Doe Run Peru's earnings in its return as a branch, the residual U.S. income tax
effect of Doe Run Peru's earnings is reflected on the financial statements of
Doe Run.
 
    FISCAL 1997 COMPARED TO FISCAL 1996
 
    NET SALES in fiscal 1997 (including the results for Doe Run Peru for the
eight-day period October 23, 1997 (the date of the Acquisition) to October 31,
1997 (the "Acquisition Stub Period")) were $280.5 million compared to $274.9
million in fiscal 1996, an increase of 2.0%. Lead metal net sales decreased from
$195.7 million to $185.1 million, a decrease of 5.4%. This change is
attributable to an increase in lead metal sales volume of 17,046 tons or 6.4%
offset by a $23.1 million reduction due to lower realized prices. The average
LME price for lead metal decreased by $.0577 per pound or 16.4% from fiscal 1996
to fiscal 1997. As a result, the Company's net realized price was 11.1% less
than fiscal 1996 (realized prices are net of hedge transactions; see
"--Liquidity and Capital Resources--Hedging Activities"). Net sales of lead
concentrates to third parties were reduced by $8.3 million in fiscal 1997 from
fiscal 1996, as these lead concentrates were used in Doe Run's production.
Tolling net sales for fiscal 1997 increased $7.3 million from fiscal 1996 due to
a 17.9% increase in volume, as well as 25.5% increase in tolling processing
charges per ton. Zinc concentrate net sales in fiscal 1997 increased $2.4
million or 10.8% from fiscal 1996 due primarily to higher realized prices.
Copper concentrate net sales in fiscal 1997 decreased $3.6 million or 29.0% from
fiscal 1996, and $1.8 million of this decrease is attributable to lower realized
prices and $1.8 million is due to lower volume resulting from an emphasis on
production of lead/zinc ore. The addition of Seafab, resulting from the
acquisition of the assets of Seafab Metal Corporation in August 1996 added $15.9
million to net sales and the inclusion of Doe Run Peru from October 23, 1997,
the acquisition date,
 
                                       51
<PAGE>
through October 31, 1997 added $2.6 million. Other net sales were lower by $.1
million accounting for the remainder of the change.
 
    COST OF SALES for fiscal 1997 (including the results for Doe Run Peru for
the Acquisition Stub Period) was $234.4 million, an increase of $18.9 million or
8.8% compared to fiscal 1996. Increased volumes of lead metal, tolling and zinc
concentrates offset by lower copper and lead concentrate volumes accounted for
$6.8 million of the increase. Higher costs of salaries and wages, materials and
supplies, and purchased feed, primarily related to increased production, were
more than offset by reduced costs of purchased lead and the impact of greater
production volume. As a result, the average cost per ton produced was
approximately 1.1% lower than the prior year reducing cost of sales by $3.1
million. The addition of Seafab contributed $13.0 million to the cost of sales
increase while the inclusion of Doe Run Peru added $2.0 million to cost of
sales. Other costs of sales were higher by $.2 million accounting for the
remainder of the change.
 
    DEPLETION, DEPRECIATION AND AMORTIZATION for fiscal 1997 (including the
results for Doe Run Peru for the Acquisition Stub Period) increased by 7.8%
primarily due to depreciation of property, plant and equipment on recent capital
additions.
 
    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES for fiscal 1997 (including the
results for Doe Run Peru for the Acquisition Stub Period) increased by $.9
million or 8.7% compared to fiscal 1996, primarily due to the addition of
Seafab.
 
    EXPLORATION EXPENSE for fiscal 1997 (including the results for Doe Run Peru
for the Acquisition Stub Period) was $2.7 million, a decrease of 7.1% from
fiscal 1996. This change is attributable to less drilling on potential mineral
properties.
 
    OPERATING INCOME for fiscal 1997 (including the results for Doe Run Peru for
the Acquisition Stub Period) was $17.7 million compared to $32.8 million for
fiscal 1996. This decrease is attributable to the factors discussed above.
 
    INTEREST EXPENSE for fiscal 1997 (including the results for Doe Run Peru for
the Acquisition Stub Period) was $13.7 million or 4.2% less than fiscal 1996.
Lower interest on subordinated notes of $.9 million was offset by the interest
under the Existing Doe Run Mining Credit Facility entered into in connection
with the acquisition of Doe Run Peru which added $.3 million to interest
expense.
 
    INCOME TAX EXPENSE reflected an effective tax rate of 109% in fiscal 1997
and 34% in fiscal 1996. In both years, the income tax expense was provided on
the basis of alternative minimum taxes paid, which exceeded the income tax
provision based on pre-tax book income. Higher pre-tax book income in fiscal
1996 reduced the impact of the alternative minimum taxes paid on the effective
tax rate for that year. Because of the uncertainty of the future benefit of net
deferred tax assets, Doe Run has recorded a valuation allowance against its net
deferred tax assets.
 
    FISCAL 1996 COMPARED TO FISCAL 1995
 
    NET SALES in fiscal 1996 were $274.9 million compared to $225.1 million in
fiscal 1995, an increase of 22.1%. Lead metal net sales increased from $167.2
million to $195.7 million, an improvement of 17.0%. The average LME price for
lead metal was $.3524 per pound during fiscal 1996, $.0716 per pound greater
than the average during fiscal 1995. The higher LME price and more favorable
market conditions improved Doe Run's net realized price for both lead metal and
lead concentrates generating increases in net sales of $13.7 million and $2.9
million, respectively. An increase in mine output along with production
improvements at Doe Run's smelters generated a $14.8 million and $5.1 million
increase in net sales from lead metal and lead concentrate volume, respectively.
Zinc and copper concentrate net sales increased by $4.1 million and $3.6
million, respectively, primarily as a result of increased sales volume. The
addition of Lone Star, resulting from the acquisition of the assets of Lone Star
Lead Construction Corp. in August 1995, and the addition of Seafab in August
1996 contributed $7.7 million to the increase in net
 
                                       52
<PAGE>
sales. Such increases were offset by a $2.1 million decrease in net sales due to
lower realized prices on copper concentrates and changes in other by-products.
 
    COST OF SALES for fiscal 1996 was $215.5 million, an increase of $35.1
million or 19.5% over fiscal 1995. The greater production volume, primarily of
lead metal and lead, copper and zinc concentrates, accounts for $20.3 million of
this increase. Higher costs for certain raw materials, supplies, purchased
services, and increased incentive compensation of $1.9 million resulting from
significantly improved profitability were partially offset by the impact of
greater production volume. As a result, the average cost per ton produced in
fiscal 1996 was approximately 2.6% higher than the prior year, adding $6.1
million to cost of sales. The inclusion of Lone Star and Seafab contributed $6.4
million to the increase, while changes in other costs, primarily smelter
by-products, account for the remaining $.4 million increase.
 
    DEPLETION, DEPRECIATION AND AMORTIZATION for fiscal 1996 increased by $1.2
million or 9.4% from fiscal 1995 primarily due to depreciation of property,
plant and equipment related to recent capital expenditures.
 
    SELLING, GENERAL AND ADMINISTRATIVE expenses increased by $1.7 million or
19.9% from fiscal 1995 to fiscal 1996. Higher incentive compensation as a result
of higher profitability accounts for $1.1 million of this increase. Increased
legal costs associated with various defenses of lawsuits (see
"Business-Environmental Matters") and consulting costs for operational
efficiency studies initiated during fiscal 1996 account for the remainder of
this increase.
 
    EXPLORATION EXPENSE increased by $1.0 million or 51.2% in fiscal 1996
compared to fiscal 1995 due primarily to increased drilling on potential mineral
properties.
 
    OPERATING INCOME for fiscal 1996 was $32.8 million compared to $21.9 million
for fiscal 1995. This increase is attributable to the factors discussed above.
 
    INCOME TAX EXPENSE reflected an effective tax rate of 34% in fiscal 1996 and
43% in fiscal 1995. In both years, income tax expense was provided on the basis
of alternative minimum taxes paid, which exceeded the income tax provision based
on pre-tax book income. Higher pre-tax book income in fiscal 1996 reduced the
impact of the alternative minimum taxes paid on the effective tax rate for that
year. Because of the uncertainty of the future benefit of net deferred tax
assets, Doe Run has recorded a valuation allowance against its net deferred tax
assets.
 
DOE RUN PERU
 
    Doe Run Peru is engaged in the smelting and refining of concentrates of
polymetallic ores, including copper, silver, zinc, lead and gold, which are sold
primarily to customers outside of Peru. These activities are the same as those
that were carried out by Metaloroya and Centromin. Metaloroya was established on
September 20, 1997, and commenced operations on October 23, 1997, as the
successor company to the operations of the former La Oroya Metallurgical Complex
of Centromin, pursuant to the Subscription Agreement.
 
    Given the diversity of its products and by-products, Doe Run Peru's
financial performance is not solely dependent upon the prospects for one of its
products or by-products. Moreover, since Doe Run Peru is a processor of complex
concentrates and does not presently own any mines from which it sources
concentrates, Doe Run Peru's financial performance is less sensitive to the
volatility of base metal prices. The primary factors affecting Doe Run Peru's
results of operations are (i) commercial terms under which Doe Run Peru
purchases concentrates and (ii) Doe Run Peru's operating costs and other
expenses.
 
  RESULTS OF OPERATIONS
 
    SIX MONTHS ENDED APRIL 30, 1998 COMPARED TO SIX MONTHS ENDED APRIL 30, 1997
 
    NET SALES increased 4.5% from $217.7 million in the 1997 period to $227.4
million in the 1998 period. Net sales of copper decreased 28.1% from $77.1
million in the 1997 period to $55.4 million in the 1998
 
                                       53
<PAGE>
period, due to a decrease in the average price per pound of 26.9% from $1.08 in
the 1997 period to $.79 in the 1998 period, and a decrease in volume of 1.5%
from 35,695 tons in the 1997 period to 35,155 tons in the 1998 period. Net sales
of silver increased 54.8% from $49.6 million in the 1997 period to $76.8 million
in the 1998 period, due to a volume increase of 30.0% from 10.0 million ounces
in the 1997 period to 13.0 million ounces in the 1998 period, as well as an
increase in the average price per ounce of 19.2% from $4.95 in the 1997 period
to $5.90 in the 1998 period. Net sales of gold increased 9.6% from $7.3 million
in the 1997 period to $8.0 million in the 1998 period, due to a volume increase
of 32.3% from 20,030 ounces in the 1997 period to 26,492 ounces in the 1998
period, offset by a decrease in the average price per ounce of 17.3% from
$363.76 in the 1997 period to $300.92 in the 1998 period. Refined lead net sales
decreased 15.0% from $34.0 million in the 1997 period to $28.9 million in the
1998 period, due to a decrease in the average price per pound of 18.8% from $.32
in the 1997 period to $.26 in the 1998 period, offset by a volume increase of
5.8% from 52,406 tons in the 1997 period to 55,437 tons in the 1998 period.
Refined zinc net sales increased 13.4% from $35.8 million in the 1997 period to
$40.6 million in the 1998 period, due primarily to a volume increase of 12.3%
from 35,351 tons in the 1997 period to 39,692 tons in the 1998 period. By
products net sales increased by 25.7% from $14.0 million in the 1997 period to
$17.6 million in the 1998 period primarily due to the sale of 5,434 tons of
bullion lead for $6.0 million in the 1998 period. No bullion lead was sold in
the 1997 period. This increase was offset by a decrease in net sales of blister
copper of 21.2% from $6.6 million in the 1997 period to $5.2 million in the 1998
period, due to a decrease in the average price per pound of 12.6% from $1.35 in
the 1997 period to $1.18 in the 1998 period and a volume decrease of 10.5% from
2,461 tons in the 1997 period to 2,203 tons in the 1998 period.
 
   
    COST OF SALES was $181.6 million in the 1997 and 1998 periods. The 1998
period includes higher power costs resulting from a new electricity contract as
of October 23, 1997, a sales volume increase of approximately 9.5% and $1.7
million of workers' profit sharing expense which was classified as cost of sales
in the 1998 period. These increases were offset by the impact of improved
metallurgical recoveries and a decrease in feed cost due to lower average prices
of copper, gold and lead.
    
 
    DEPRECIATION AND AMORTIZATION EXPENSES increased 21.4% from $2.8 million in
the 1997 period to $3.4 million in the 1998 period, primarily due to the change
in asset basis resulting from the Acquisition.
 
   
    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES decreased 9.9% from $10.1
million in the 1997 period to $9.1 million (excluding $7.8 million of
intercompany fees) in the 1998 period. Selling expenses decreased 12.9% from
$3.1 million in the 1997 period to $2.7 million in the 1998 period, due to a
decrease in freight expenses and sales commissions based on new terms agreed
with third parties. General and administrative expenses were $.6 million lower
in the 1998 period. Of this decrease, $.5 million was due to the personnel
reduction program undertaken by Centromin, which was completed during the 1997,
and $1.8 million was due to the reclassification of workers' profit sharing to
cost of sales. These decreases were offset by increases in audit and legal fees
and other expenses related to the Old Notes Offering and by higher salaries and
fringes and other administrative costs.
    
 
   
    OPERATING INCOME increased 9.3% from $23.3 million in the 1997 period to
$25.5 million in the 1998 period as a result of the factors discussed above.
    
 
    OTHER EXPENSE decreased 71.4% from $1.4 million in the 1997 period to $.4
million in the 1998 period primarily due to the completion of the privatization
program which was in effect during the 1997 period, partially offset by
translation gains.
 
    INTEREST EXPENSE increased from $.8 million in the 1997 period to $5.7
million in the 1998 period, due primarily to the loans obtained to finance the
Acquisition.
 
                                       54
<PAGE>
    PERIOD FROM JANUARY 1, 1997 TO OCTOBER 23, 1997 COMPARED TO YEAR ENDED
       DECEMBER 31, 1996
 
    The results of operations for the period January 1, 1997 to October 23, 1997
are not necessarily comparable with the results of operations for the year ended
December 31, 1996 due to the shorter period included in the 1997 results.
 
    NET SALES decreased 22.8% from $456.8 million in 1996 to $352.8 million in
the 1997 period, due principally to the shorter period in 1997, changes in the
mix of existing products and a significant blister copper sale made in 1996. Net
sales of copper decreased 17.8% from $148.4 million in 1996 to $122.0 million in
the 1997 period, due to a volume decrease of 20.4% from 71,287 tons in 1996 to
56,725 tons. This decrease included a volume decrease of 96.6% from 5,537 tons
in 1996 to 186 tons in the 1997 period, when two years' of accumulated stock of
copper blister was sold. The volume changes were offset partially by an increase
in the average price per pound of 3.8% from $1.04 in 1996 to $1.08 in the 1997
period. Net sales of silver decreased 25.9% from $111.0 million in 1996 to $82.2
million in the 1997 period, due to a volume decrease of 18.4% from 21.2 million
ounces in 1996 to 17.3 million ounces in the 1997 period as well as a decrease
in the average price per ounce of 10.2% from $5.23 in 1996 to $4.70 in the 1997
period. Net sales of gold decreased 42.2% from $20.4 million in 1996 to $11.8
million in the 1997 period, due to a volume decrease of 34.4% from 52,277 ounces
in 1996 to 34,305 ounces in the 1997 period and a decrease in the average price
per ounce of 11.9% from $389.5 in 1996 to $342.9 in the 1997 period. Refined
lead net sales decreased 31.6% from $76.3 million in 1996 to $52.2 million in
the 1997 period, due to a volume decrease of 16.3% from 104,063 tons in 1996 to
87,135 tons in the 1997 period and a decrease in the average price per pound of
18.9% from $.37 in 1996 to $.30 in the 1997 period. Refined bismuth net sales
increased 37.5% from $4.8 million in 1996 to $6.6 million in the 1997 period,
due primarily to a volume increase of 53.0% from 660 tons in 1996 to 1,010 tons
in the 1997 period and a decrease in the average refined bismuth price per pound
of 10.3% from $3.30 to $2.96.
 
    COST OF SALES decreased 23.0% from $397.2 million in 1996 to $305.9 million
in the 1997 period, due principally to the shorter period, 18.1%, as well as
lower labor expenses resulting from the personnel reduction costs carried out in
1996.
 
    DEPRECIATION AND AMORTIZATION EXPENSES decreased 13.0% from $5.4 million in
1996 to $4.7 million in the 1997 period, due primarily to the shorter period in
1997 as well as the adjustment to the depreciation of initial balances of fixed
assets made in 1996.
 
    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES (INCLUDING MARKETING EXPENSE)
decreased 20.7% from $17.4 million in 1996 to $13.8 million in 1997. Personnel
reduction costs decreased 61.5% from $3.9 million in 1996 to $1.5 million in the
1997 period, as Doe Run Peru had substantially completed its personnel reduction
program in 1996. Selling, marketing and administrative expenses were lower by
$2.3 million, or 18.6%, in the 1997 period, primarily due to the shorter period
in 1997. Worker's profit sharing was greater by $1.1 million, or 91%, in the
1997 period due primarily to improved profitability.
 
    OPERATING INCOME declined from $36.9 million in 1996 to $28.3 million in the
1997 period due to the factors discussed above.
 
    INTEREST AND BANK CHARGES decreased 75.8% from $3.3 million in 1996 to $0.8
million in the 1997 period, due primarily to a decrease of debt levels through
1997, which was offset by the effects of a slight increase in the weighted
average interest rate in the 1997 period.
 
    OTHER, NET decreased 94.9% from $23.5 million in 1996 to $1.2 million in the
1997 period. In 1996, the Company incurred special charges related primarily to
(i) costs related to relocating residents away from the metallurgical complex of
La Oroya, such as demolition, and construction of apartments, schools and parks
at a new location and (ii) an accrual to provide for estimated future
expenditures under the PAMA of $21.5 million.
 
                                       55
<PAGE>
    INCOME TAX increased 92.7% from $4.1 million in 1996 to $7.9 million in the
1997 period as a result of the increase in pretax income due to reasons
discussed above.
 
    NET INCOME increased 212.2% from $5.9 million in 1996 to $18.4 million in
the 1997 period, due to reasons discussed above.
 
    YEAR ENDED DECEMBER 31, 1996 COMPARED TO YEAR ENDED DECEMBER 31, 1995
 
    NET SALES increased 1.3% from $450.9 million in 1995 to $456.8 million in
1996, due principally to sale of a new product and changes in the mix of
existing products. In 1996, Doe Run Peru commenced sale of a new product,
blister copper, amounting to $14.0 million. Refined lead net sales increased
29.4% from $58.9 million in 1995 to $76.3 million in 1996, due to a volume
increase of 5.4% from 98,746 tons in 1995 to 104,063 tons in 1996 and an
increase in the average price per pound of 23.3% from $.30 in 1995 to $.37 in
1996. Refined bismuth net sales also increased 17.1% from $4.1 million in 1995
to $4.8 million in 1996, due primarily to a volume increase of 26.7% from 574
tons in 1995 to 728 tons in 1996 and a decrease in the average price per pound
of 6.8% from $3.54 in 1995 to $3.30 in 1996. Although the volume of refined
copper sold in 1996 increased 1.8% from 70,006 tons in 1995 to 71,287 tons in
1996, the decrease in the price per pound of refined copper of 21.8% from $1.33
in 1995 to $1.04 in 1996 resulted in a decrease in net sales of refined copper
of 20.6% from $186.9 million in 1995 to $148.4 million.
 
    COSTS OF SALES decreased 0.1% from $397.5 million in 1995 to $397.2 million
in 1996, due to the effects of the 1996 personnel reduction program, which was
offset by the additional cost related to the use of independent contractors in
place of terminated employees. This reduction in cost was achieved despite a
moderate increase in the volume of concentrates processed in 1996.
 
    DEPRECIATION AND AMORTIZATION EXPENSES increased 14.9% from $4.7 million in
1995 to $5.4 million in 1996 due primarily to adjustment of the depreciation of
the initial balances of the fixed assets.
 
    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES (INCLUDING MARKETING EXPENSE)
increased by 8.8% from $16.0 million in 1995 to $17.4 million in 1996. Personnel
reduction costs increased 56.0% from $2.5 million in 1995 to $3.9 million in
1996 due to the implementation of a second personnel reduction program of 600
workers in 1996. Administrative expenses increased 26.7% from $4.5 million in
1995 to $5.7 million in 1996 primarily due to the shift to use of independent
contractors in place of employees. Selling and marketing expenses increased
11.7% from $6.0 million in 1995 to $6.7 million in 1996 due to the increased
volume of metal sold in 1996 as discussed above.
 
    OPERATING INCOME increased from $32.7 million in 1995 to $36.9 million in
1996 due to the factors discussed above.
 
    INTEREST AND BANK CHARGES increased 57.1% from $2.1 million in 1995 to $3.3
million in 1996, due primarily to higher average borrowings, which was offset by
the effects of a slight decrease in the weighted average interest rate in 1996.
 
    OTHER, NET increased from $1.8 million in 1995 to $23.5 million in 1996. In
1996, Doe Run Peru incurred special charges related primarily to (i) costs
related to relocating residents away from the metallurgical complex of La Oroya,
such as demolition, and construction of apartments, schools and parks at a new
location and (ii) an accrual to provide for estimated future expenditures under
the PAMA of $21.5 million.
 
    INCOME TAX decreased 60.2% from $10.3 million in 1995 to $4.1 million in
1996 as a result of the decrease in pretax income due primarily to the special
charges discussed above.
 
    NET INCOME decreased 68.1% from $18.5 million in 1995 to $5.9 million in
1996, due to reasons discussed above. As a percentage of net sales, net income
was 4.1% in 1995 compared to 1.3% in 1996.
 
                                       56
<PAGE>
LIQUIDITY AND CAPITAL RESOURCES
 
    The Company's liquidity requirements arise from working capital
requirements, capital investments and interest payment obligations. Doe Run's
primary available sources of liquidity are cash provided by operating activities
and existing cash balances in the United States, as well as cash receipts from
certain management services and sales agency agreements, loans, advances,
distributions or dividends between Doe Run and Doe Run Peru. See "Certain
Transactions--Intercompany Transactions." Doe Run also has available the New Doe
Run Revolving Credit Facility that provides for advances by the lender to a
maximum of $100.0 million less outstanding letters of credit, based on specific
percentages of eligible receivables and inventories. As of June 30, 1998, $4.8
million was outstanding, exclusive of $4.9 million of letters of credit, under
the New Doe Run Revolving Credit Facility. See "Description of New Revolving
Credit Facilities--New Doe Run Revolving Credit Facility." Doe Run was not in
compliance with the minimum net worth and maximum leverage ratio covenants under
the Doe Run Term Loan and the Existing Doe Run Revolving Credit Facility for the
fiscal quarter ended January 31, 1998, for which Doe Run received waivers. Doe
Run repaid all amounts outstanding under the Existing Doe Run Credit Facility
with the net proceeds of the Old Notes Offering.
 
    Doe Run Peru's primary available source of liquidity is cash provided by
operating activities. Doe Run Peru also has available the New Doe Run Peru
Revolving Credit Facility that provides for advances by the lender to a maximum
of $40.0 million less outstanding letters of credit, based upon specific
percentages of eligible receivables and inventories. As of June 30, 1998, no
amounts were outstanding under the New Doe Run Peru Revolving Credit Facility,
other than existing letters of credit. See "Description of New Revolving Credit
Facilities--New Doe Run Peru Revolving Credit Facility."
 
    With respect to the Company, for the six months ended April 30, 1998, of the
$3.2 million net increase in cash, $1.7 million was used in operating
activities, $135.9 million was used in investing activities and $140.8 million
was provided by financing activities, and in fiscal 1997, $18.0 million was
provided by operating activities, $141.7 million was used in investing
activities and $132.6 million was provided by financing activities. As part of
its financing activities, Doe Run borrowed $130.0 million under the Doe Run Term
Loan to finance, in part, the Acquisition. The net proceeds of the Doe Run Term
Loan were used to pay $60.0 million to Fluor in full settlement of the Fluor
Indebtedness, to make the $23.0 million Subordinated Loan, to make a $2.0
million capital contribution to Doe Run Cayman and to repay all amounts
outstanding under Doe Run's then existing revolving credit facility.
 
    Doe Run has budgeted approximately $13.3 million for capital expenditures
for fiscal 1998, primarily for replacement and maintenance of operations, and
environmental improvements. In addition to ongoing capital investments, Doe Run
has expended an average of approximately $59.5 million per year on maintenance
from fiscal 1995 through fiscal 1997. As a result of these expenditures and
ongoing efforts, Doe Run believes that it operates and will continue to maintain
modern and efficient facilities.
 
    With respect to Doe Run Peru, for the six months ended April 30, 1998, of
the $4.8 million net increase in cash, $7.0 million was used in operating
activities, $1.5 million was used in investing activities and $13.3 million was
provided by financing activities, and for the period January 1, 1997 to October
23, 1997, $28.1 million was provided by operating activities and $28.6 million
was used in financing activities. Historical cash flows from Doe Run Peru's
operating and investing activities for the period January 1, 1997 to October 23,
1997 are not necessarily comparable with the historical cash flows for the year
ended December 31, 1996 due to the shorter period included in the 1997 period.
As a division of Centromin, Doe Run Peru's Predecessor was historically
dependent on Centromin for its working capital management and liquidity
requirements.
 
    As part of the Acquisition, Doe Run Peru will undertake over a ten-year
period the Capital Investment Program of approximately $300.0 million, in part
to satisfy its Investment Commitment of $120.0 million as set forth in the
Subscription Agreement. Doe Run Peru has budgeted approximately
 
                                       57
<PAGE>
$16.0 million for capital expenditures for fiscal 1998, primarily for
replacement and maintenance of operations, and environmental improvements.
 
    The Company has significant indebtedness outstanding. See "Risk
Factors--Substantial Indebtedness." In addition, the Company will borrow
approximately $54.5 million to finance the Potential ASARCO MLD Acquisition.
Management believes that cash flow from operations at Doe Run and Doe Run Peru,
in addition to availability under the New Revolving Credit Facilities, will be
sufficient to provide for the Company's liquidity needs for the foreseeable
future.
 
    The New Revolving Credit Facilities, as well as the Indenture, contain
numerous covenants and prohibitions that impose limitations on the liquidity of
the Company, including requirements that Doe Run and Doe Run Peru satisfy
certain financial ratios and limitations on the incurrence of additional
indebtedness. See "Risk Factors--Restrictions Imposed by Terms of the Company's
Indebtedness," "Description of New Revolving Credit Facilities" and "Description
of the Notes--Certain Covenants." The ability of the Company to meet its debt
service requirements and to comply with such covenants will be dependent upon
future operating performance and financial results which will be subject to
financial, economic, political, competitive and other factors affecting the
Company, many of which are beyond the Company's control.
 
    INFLATION AND SEASONALITY
 
    In general, the Company's cost of sales and selling, general and
administrative expenses are affected by inflation and the effects of inflation
may be experienced by the Company in future periods. Management believes,
however, that such effects have not been material to Doe Run during the past
three years. With respect to Doe Run Peru, its labor costs and selling, general
and administrative expenses, are denominated in local currency, whereas
substantially all of its net sales are denominated in U.S. dollars. Doe Run's
business is somewhat seasonal; typically in excess of 60% of annual lead metal
shipments are made in the months of July through December as a result of
seasonal demand from battery manufacturers. Doe Run Peru's business is generally
not affected by seasonal factors.
 
    ENVIRONMENTAL MATTERS
 
    The Company has incurred and will continue to incur capital and operating
expenditures for matters relating to environmental control and monitoring.
Capital expenditures by Doe Run for environmental control and monitoring were
$1.8 million, $6.8 million and $7.3 million for the fiscal years 1995, 1996 and
1997, respectively. Due to the pending sale and associated uncertainties,
Metaloroya environmental expenditures in 1995, 1996 and 1997 were modest. Doe
Run and Doe Run Peru estimate their environmental capital expenditures will be
approximately $4.8 million and $2.7 million, respectively, in fiscal 1998, and
$3.3 and $3.7, respectively, in fiscal 1999. See "Business--Doe
Run--Environmental Matters" and "--Doe Run Peru--Environmental Matters."
 
    Doe Run expended on all environmental matters, which includes amounts
capitalized, amounts charged to operating expense and amounts charged to
reserves, approximately $17.5 million in fiscal 1997, and the Company estimates
such expenditures will be $18.0 million and $18.2 million in fiscal 1998 and
1999, respectively.
 
    Environmental laws and regulations have changed rapidly in recent years, and
the Company may become subject to more stringent environmental laws and
regulations in the future. Compliance with more stringent environmental laws and
regulations could have a material adverse effect on the Company's consolidated
financial position, results of operations and liquidity. The Environmental
Protection Agency (the "EPA") has asserted certain alleged environmental
violations against Doe Run, which are described in "Business--Doe
Run--Environmental Matters."
 
                                       58
<PAGE>
    HEDGING ACTIVITIES
 
    In the normal course of its business, Doe Run has used in the past and may
use in the future forward sales commitments and commodity put and call option
contracts to manage its exposure to fluctuations in the prices of lead, copper,
zinc and silver. Contract positions are designed to ensure that the Company will
receive a defined minimum price for certain quantities of its production. Gains
and losses, and the related costs paid or premiums received, for option
contracts which hedge the sales prices of commodities are recognized in net
sales when the related production is sold. None of the aforementioned activities
have been entered into for speculative purposes.
 
    Metaloroya, as a government-owned enterprise, did not undertake hedging
activities. Doe Run has implemented hedging activities on behalf of Doe Run Peru
consistent with the practices at Doe Run.
 
    YEAR 2000 BUSINESS MATTERS
 
    Many information and process control systems used in the current business
environment were designed to use only two digits in the date field, and thus may
not function properly in the year 2000. The Company has conducted a
comprehensive review of its computer systems to identify the systems that could
be affected by the "year 2000 problem" and has implemented a plan to resolve the
issues identified. Any of the Company's programs that have date-sensitive
software may recognize a date using "00" as the year 1900 rather than the year
2000, which could result in a major system failure or in miscalculation.
Currently, most of the major systems of the Company have been modified to be
year 2000 compliant. The Company anticipates that the appropriate modifications
to all information and process control systems will be completed by the end of
1998. The cost of achieving year 2000 compliance is included in the Company's
operating and administrative expenses. The Company does not currently expect
year 2000 issues to have any material effect the Company's costs or to cause any
significant disruption in operations.
 
                                       59
<PAGE>
                                    INDUSTRY
 
    Doe Run's principal product is refined lead, and Doe Run Peru's principal
products include base metals, copper, lead and zinc, and precious metals, silver
and gold. Market prices for these metals tend to be cyclical and reflect a
combination of factors, including prevailing economic conditions, market demand,
prevailing trends of inventory levels and, to a lesser extent, inventory
carrying costs (primarily interest rates), international exchange rates and the
actions of participants in the commodity markets. These factors have been of
varying importance in influencing the prevailing metal prices and often have had
divergent impacts on such price. Lead, copper, silver, zinc and gold are all
publicly traded on one or more commodity exchanges, including the LME. The LME
provides an efficient and orderly market on which to trade non-ferrous metals.
The market provides reference prices for worldwide pricing of activities
relating to non-ferrous metals, and it provides storage facilities to enable
market participants to make or take physical delivery of approved brands of
metals. Summarized below is a general overview of the lead, copper, zinc and
silver markets.
 
LEAD
 
    Lead is a versatile metal used in both its pure form and in alloys, due to
its electrochemical characteristics, density, malleability and corrosion
resistance. Primary uses for refined lead include lead-acid batteries, lead
pigments and compounds, rolled and extruded products, cable sheathing and
ammunition.
 
    Similar to other base metals, lead prices fluctuate generally based on world
supply and demand. Western world consumption of lead for 1997 was estimated at
5.8 million tons, which represents a total market of approximately $3.2 billion.
The following table sets forth western world lead consumption by end use for the
period 1960 through 1997:
 
                   WESTERN WORLD LEAD CONSUMPTION BY END USE
<TABLE>
<CAPTION>
                                                                           1960       1970       1980       1990       1997
                                                                         ---------  ---------  ---------  ---------  ---------
<S>                                                                      <C>        <C>        <C>        <C>        <C>
                                                                                          (TONS IN THOUSANDS)
Batteries..............................................................        767      1,305      2,046      3,124      4,120
Pigments and Compounds.................................................        251        440        740        645        598
Rolled and Extruded Products...........................................        285        280        392        496        464
Cable Sheathing........................................................        474        430        350        248        141
Gasoline...............................................................        206        422        348         50         50
Other..................................................................        459        962        478        396        439
                                                                         ---------  ---------  ---------  ---------  ---------
    Total..............................................................      2,442      3,839      4,354      4,959      5,812
                                                                         ---------  ---------  ---------  ---------  ---------
                                                                         ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
                                                                            CAGR
                                                                           1960 TO
                                                                            1997
                                                                         -----------
<S>                                                                      <C>
Batteries..............................................................         4.6%
Pigments and Compounds.................................................         2.4
Rolled and Extruded Products...........................................         1.3
Cable Sheathing........................................................        (3.2)
Gasoline...............................................................        (3.8)
Other..................................................................        (0.1)
    Total..............................................................         2.4%
</TABLE>
 
    Lead demand has increased consistently at a CAGR of approximately 2.4% for
the period 1960 to 1997 and approximately 2.0% for the period 1987 to 1997,
driven primarily by demand for lead-acid batteries. Approximately 4.2 million
tons, or 72%, of the lead consumed in 1997 was used in the production of
lead-acid batteries, 75% of which was for SLI batteries. Approximately 77% of
SLI battery sales are in the automotive replacement market, a market with stable
demand characteristics, which is dependent upon the number of automobiles in
service and battery life.
 
    Lead pigments and compounds are the second largest use of lead and include
such end uses as computer and television screens, leaded glass and crystal and
printed circuit boards. Uses of rolled and extruded lead products include lead
anode plates used in the production of refined copper, radiation shielding for
health care applications and roof flashings construction applications.
Historically, lead has also been used as an additive in gasoline to reduce
engine knock and for insulation of underground cables.
 
                                       60
<PAGE>
Environmental concerns arising in the early 1980s, however, caused a significant
reduction in the amount of lead utilized for gasoline, and technical
considerations have reduced usage of lead in cable sheathings.
 
    The western world supply of refined lead is dependent upon the availability
of lead ore, the principal raw material for primary smelters, secondary sources
and net exports of lead from non-western world countries, such as the former
Soviet Union and China. The following table summarizes western world refined
lead supply for the period 1988 to 1997:
 
                       WESTERN WORLD REFINED LEAD SUPPLY
<TABLE>
<CAPTION>
                                               1988       1989       1990       1991       1992       1993       1994       1995
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                          <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
                                                                              (TONS IN THOUSANDS)
Western World:
  Primary Production.......................      2,628      2,583      2,431      2,503      2,563      2,550      2,540      2,531
  Secondary Production.....................      2,308      2,489      2,495      2,385      2,369      2,316      2,528      2,722
Non-Western World Net Exports..............        (44)       (31)        88         75        205        165        255        241
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
    Total supply...........................      4,892      5,041      5,014      4,963      5,137      5,031      5,323      5,494
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
                                               1996       1997
                                             ---------  ---------
<S>                                          <C>        <C>
 
Western World:
  Primary Production.......................      2,477      2,562
  Secondary Production.....................      2,858      2,981
Non-Western World Net Exports..............        328        243
                                             ---------  ---------
    Total supply...........................      5,663      5,786
                                             ---------  ---------
                                             ---------  ---------
</TABLE>
 
    Since 1991, primary lead production has remained relatively constant.
Management believes that due to capital costs and environmental concerns, no new
primary smelting capacity will be added in the world in the foreseeable future.
As a result, primary production is expected to remain relatively constant, with
any increase resulting from operational improvements at existing facilities.
 
    Refined lead supply is also affected by the availability of lead ore which
is the principal raw material for primary production facilities throughout the
world. The following table summarizes western world lead mine production for the
period 1988 to 1997:
 
                       WESTERN WORLD LEAD MINE PRODUCTION
<TABLE>
<CAPTION>
                                               1988       1989       1990       1991       1992       1993       1994       1995
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                          <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
                                                                              (TONS IN THOUSANDS)
North America..............................        820        745        779        804        769        548        558        624
Australia..................................        482        517        592        588        582        548        528        485
Latin America..............................        425        462        459        442        427        428        472        455
Western Europe.............................        411        381        374        335        306        276        301        270
Africa.....................................        216        192        181        187        185        213        203        200
Asia.......................................        131        123        119        121        115         91         86         98
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
    Total..................................      2,485      2,420      2,504      2,477      2,384      2,104      2,148      2,132
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
                                               1996       1997
                                             ---------  ---------
<S>                                          <C>        <C>
 
North America..............................        707        665
Australia..................................        540        535
Latin America..............................        477        486
Western Europe.............................        267        289
Africa.....................................        202        194
Asia.......................................        109         91
                                             ---------  ---------
    Total..................................      2,302      2,260
                                             ---------  ---------
                                             ---------  ---------
</TABLE>
 
    Although primary production has remained relatively constant, lead
production from secondary sources has increased, driven primarily by the greater
availability of spent lead-acid batteries and other lead-bearing materials. Due
to heightened environmental awareness, stockpiling of lead-bearing materials
such as batteries became economically unviable during the early 1990s. As a
result, battery manufacturers established outlets for spent batteries returned
in connection with replacement battery sales, which has resulted in the
development of secondary facilities throughout the world. By 1997, approximately
3.0 million tons of lead were being converted from secondary materials.
Secondary processing of lead results in approximately 98% recovery of lead from
the lead-bearing materials. Battery manufacturers have increasingly integrated
their operations into the secondary market in addition to purchasing primary and
secondary lead from third parties such as Doe Run. Management estimates that the
secondary supply of lead will continue to increase in the foreseeable future, as
the availability of spent lead-acid batteries and
 
                                       61
<PAGE>
other lead bearing materials requiring recycling increases. This trend is
expected to result in a more predictable pattern of lead supply.
 
    Lead supply in the western world is also impacted by net exports of lead
from Eastern Europe, the former Soviet Union and China. Prior to 1990, these
regions were net importers of refined lead. In the early 1990s, these regions
experienced adverse economic conditions and consequently began exporting lead
and other metals to build hard currency reserves. Since 1994, exports from
Eastern Europe and the former Soviet Union have declined, which management
believes reflects both a reduction in inventories and production capabilities
resulting from the closure of inefficient facilities. Increased exports from
China have more than offset this reduction, resulting in an increase of net
exports to the western world in 1996. Industry data for 1997 indicates that net
exports from China declined 30.0% from 1996, and consumption in China increased
4.0%.
 
    The price of refined lead in the western world reflects a combination of
factors including prevailing economic conditions, lead demand and the
availability of refined lead in the market. Lead prices are also affected by
international trade with non-western world producers that export lead into the
western world. The following table sets forth the average LME prices for lead
during each of the years 1988 to 1997.
<TABLE>
<CAPTION>
                                               1988       1989       1990       1991       1992       1993       1994       1995
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                          <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
LME Prices (per pound).....................  $     .30  $     .31  $     .37  $     .25  $     .24  $     .18  $     .25  $     .29
 
<CAPTION>
                                               1996       1997
                                             ---------  ---------
<S>                                          <C>        <C>
LME Prices (per pound).....................  $     .35  $     .28
</TABLE>
 
    The LME price for lead as of June 30, 1998 was $.25 per pound. Management
attributes the decline from 1997 levels to a general slowdown in replacement
battery sales resulting from more moderate weather conditions in late 1996 and
early 1997 in North America and Europe.
 
COPPER
 
    Copper ranks second to aluminum as the most widely used non-ferrous metal in
the world. Recognized for its metallurgical and physical properties, including
high electrical and thermal conductivity, corrosion resistance, ductility,
malleability and strength, copper is a versatile metal, used in its pure form
and in alloys in a variety of industrial markets. These markets include
construction, electrical and electronic parts, industrial machinery and
equipment, transportation and consumer products.
 
    From 1987 to 1997, western world copper demand grew at a CAGR of
approximately 3.3%, during which time copper prices averaged $1.08 per pound. In
1997, western world copper consumption was estimated at 12.3 million tons, a
record level for the twelfth consecutive year, which represents a total market
of $25.3 billion. The following table sets forth the average LME prices for
copper during each of the years 1988 to 1997.
<TABLE>
<CAPTION>
                                               1988       1989       1990       1991       1992       1993       1994       1995
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                          <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
LME Prices (per pound).....................  $    1.18  $    1.29  $    1.21  $    1.06  $    1.04  $     .87  $    1.05  $    1.33
 
<CAPTION>
                                               1996       1997
                                             ---------  ---------
<S>                                          <C>        <C>
LME Prices (per pound).....................  $    1.04  $    1.03
</TABLE>
 
    The LME price for copper as of June 30, 1998 was $.73 per pound. Management
attributes the decline from 1997 levels to a general increase in metal
inventories following higher production levels against softening demand in Asia.
 
ZINC
 
    Zinc is the third most widely used non-ferrous metals in the world, with
annual consumption exceeded only by aluminum and copper. Zinc is principally
used as an anti-corrosive coating to produce galvanized steel, which ultimately
is consumed in the automotive and construction industries. The galvanizing of
steel sheet and strip accounts for approximately 50% of annual zinc consumption
and is the largest growth sector for zinc. Other uses for zinc include alloys,
such as brass, used in a variety of consumer products and zinc-aluminum used in
the production of pressure die cast parts. From 1987 to 1997, western world zinc
 
                                       62
<PAGE>
demand grew at a CAGR of approximately 2.5%, during which time zinc prices
averaged $.53 per pound. In 1997, western world zinc consumption was estimated
at 7.1 million tons, which represents a total market of $8.5 billion. The
following table sets forth the average LME prices for zinc during each of the
years 1988 to 1997.
<TABLE>
<CAPTION>
                                               1988       1989       1990       1991       1992       1993       1994       1995
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                          <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
LME Prices (per pound).....................  $     .56  $     .78  $     .69  $     .51  $     .56  $     .44  $     .45  $     .47
 
<CAPTION>
                                               1996       1997
                                             ---------  ---------
<S>                                          <C>        <C>
LME Prices (per pound).....................  $     .47  $     .60
</TABLE>
 
    The LME price for zinc as of June 30, 1998 was $.45 per pound. Management
attributes the decline from 1997 levels to an increase in the availability of
zinc concentrates in the market.
 
SILVER
 
    Silver historically has been used principally in coinage, reflecting its
monetary value as a precious metal. Presently, however, demand for silver is
predominately commercial, with uses in photography, electrical and electronic
products, tableware, jewelry, medicine and dentistry. Industrial demand, which
accounts for approximately 98% of total silver demand, increased 5.5% in 1997 to
799 million ounces, which represents a total market of $3.9 billion. From 1987
to 1997, western world silver demand grew at a CAGR of approximately 5.8%,
during which time silver prices averaged $4.97 per ounce. The following table
sets forth the average LBMA prices for silver during each of the years 1988 to
1997.
   
<TABLE>
<CAPTION>
                                               1988       1989       1990       1991       1992       1993       1994       1995
                                             ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                          <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
LBMA Prices (per ounce)....................  $    6.53  $    5.50  $    4.83  $    4.05  $    3.95  $    4.30  $    5.28  $    5.20
 
<CAPTION>
                                               1996       1997
                                             ---------  ---------
<S>                                          <C>        <C>
LBMA Prices (per ounce)....................  $    5.10  $    4.90
</TABLE>
    
 
    The LBMA silver price as of June 30, 1998 was $5.32 per ounce. Management
believes that increases in 1998 reflect an imbalance between supply and demand
for silver, with the demand for silver for commercial applications exceeding the
available supply from producers.
 
                                       63
<PAGE>
                                    BUSINESS
 
GENERAL
 
    Doe Run is the largest fully-integrated lead producer in North America and
the second largest primary lead producer in the western world. Through its
subsidiary Doe Run Peru, Doe Run operates one of the largest polymetallic
processing facilities in the western world offering an extensive product mix of
non-ferrous and precious metals, including copper, silver, zinc, lead and gold.
The combined capabilities of Doe Run and Doe Run Peru represent the largest
primary lead producer in the western world.
 
    On October 23, 1997, Doe Run Peru acquired Metaloroya from Centromin, a
Peruvian government-owned conglomerate, as part of the ongoing privatization
program sponsored by the government of Peru. On December 30, 1997, Metaloroya
was merged into Doe Run Peru.
 
   
    The Company had pro forma net sales, income before extraordinary item and
EBITDA of $709.8 million, $3.7 million and $77.4 million, respectively, for the
twelve months ended October 31, 1997 and pro forma net sales, loss before
extraordinary item and EBITDA of $343.4 million, $5.6 million and $40.4 million,
respectively, for the six months ended April 30, 1998.
    
 
  DOE RUN
 
    Doe Run's integrated operations permit Doe Run to participate in and manage
the entire lead life cycle, including the mining of lead ore, the production of
refined lead metal, the fabrication of value-added lead products and the
secondary recycling of spent lead-acid batteries and other lead-bearing
materials. Doe Run believes its reputation for excellent service, product
quality and timely delivery permits it to consistently realize premiums for its
products, resulting in sales prices above the market price for lead quoted on
the LME.
 
    In fiscal 1997, Doe Run shipped approximately 350,000 tons of refined lead
metal and lead alloy products, including recycled lead, representing
approximately 18% of North American consumption and 6% of western world
consumption. Doe Run had net sales, net loss and EBITDA of $277.9 million, $1.1
million and $31.9 million, respectively, for fiscal 1997, excluding the results
of operations of Doe Run Peru for the eight-day period from October 23, 1997
(the date of consummation of the Acquisition) through October 31, 1997 and net
sales, net loss and EBITDA (excluding intercompany transactions) of $118.5
million, $14.2 million and $4.2 million, respectively, for the six months ended
April 30, 1998.
 
    Refined lead product sales accounted for approximately 67% and 68% of Doe
Run's total net sales, or $185.1 million and $80.6 million, respectively, in
fiscal 1997 and for the six months ended April 30, 1998, respectively. The
balance of Doe Run's net sales resulted from (i) tolling services provided to
major U.S. lead-acid battery manufacturers, (ii) lead production by-products,
including zinc and copper concentrates, and (iii) value-added fabricated lead
products, such as lead sheet and bricks. These net sales from tolling services,
by-products and fabricated products provide sources of revenue largely
independent of lead prices.
 
    Western world lead consumption in 1997 was estimated at 5.8 million tons
which represents a total market of approximately $3.2 billion. Approximately 4.2
million tons, or 72%, of this lead was used in the production of lead-acid
batteries, approximately 75% of which was for SLI batteries. Approximately 77%
of SLI battery sales are in the automotive replacement market, a market with
stable demand characteristics, which is dependent upon the number of automobiles
in service and battery life.
 
    The lead-acid battery remains the most cost competitive battery technology
for SLI batteries, which management believes will not change in the foreseeable
future. Other uses for refined lead include computer and television screens,
ammunition, stationary batteries used as backup power sources and rolled and
extruded lead products used in radiation shielding and roofing materials.
 
                                       64
<PAGE>
    The market for refined lead continues to grow primarily as a result of
increasing demand for lead-acid batteries used for automobiles and other
vehicles as a result of worldwide economic growth. As a result, western world
lead consumption grew at a CAGR of 2.0% between 1987 and 1997. Doe Run believes
that this growth rate will accelerate in the future as batteries become an even
larger portion of the lead market, particularly in light of expected economic
growth leading to increased vehicle population in developing economies.
 
    Approximately 45% of annual western world lead consumption is supplied from
newly mined or "primary" ore, and the balance is supplied from secondary
sources, principally the recycling of spent lead-acid batteries and other
lead-bearing materials. Since 1990, primarily due to heightened environmental
awareness, secondary lead capacity has increased, whereas primary lead capacity
has remained relatively constant. Management believes that secondary sources of
lead will continue to account for an increasing share of the total worldwide
lead market.
 
    The average LME price for refined lead was $.29 per pound in fiscal 1997. As
of June 30, 1998, the LME price for lead was $.25 per pound, which was below the
ten-year average price of $.28 per pound. Management believes that lead prices
will remain relatively stable or will modestly increase for the remainder of
fiscal 1998 and over the long term will reflect the historical industry average.
As a result of the recent lead price decreases, the Company expects that it will
incur an operating loss in its U.S. operations that will adversely affect its
EBITDA in fiscal 1998.
 
    Doe Run conducts its mining operations along approximately 40 miles of the
Viburnum Trend in Southeastern Missouri, one of the world's most productive lead
deposits. Doe Run operates six production shafts, four processing mills, one
primary smelter and one secondary smelter. During fiscal 1997, Doe Run mined in
excess of 5.0 million tons of ore containing average grades of 5.17% lead, 1.02%
zinc and 0.27% copper. At the end of fiscal 1997, Doe Run's proven and probable
reserves consisted of approximately 70 million tons, containing approximately
3.8 million tons of recoverable lead or approximately fourteen years of
production at current mining rates.
 
    Doe Run's primary smelter in Herculaneum, Missouri is the largest in North
America and the second largest in the world, with an annual production capacity
of approximately 250,000 tons of refined lead. Since entering the recycling
business in 1992, Doe Run has become a leading producer of secondary lead at its
Buick recycling facility and secondary smelter located in Boss, Missouri. At
this facility, Doe Run is reclaiming at a rate of approximately 105,000 tons of
refined lead per year, approximately 60% of which is derived from tolling
arrangements with major U.S. battery manufacturers.
 
  DOE RUN PERU
 
    Doe Run Peru's unique combination of base metal smelters, refineries and
by-product circuits enable Doe Run Peru to process complex polymetallic
concentrates and to recover base metals and by-products at international quality
standards. Doe Run Peru's location in central Peru, approximately 110 miles from
Lima, allows Doe Run Peru to source concentrates advantageously from mines
located throughout the central Andes mountains, particularly in Peru. Moreover,
Doe Run Peru's proximity to Lima's Callao port provides it ready access to major
world markets for its products.
 
    For the twelve months ended October 31, 1997 and the six months end April
30, 1998, Doe Run Peru shipped approximately 70,000 tons and 35,000 tons,
respectively, of refined copper, 107,000 tons and 55,000 tons, respectively, of
refined lead, 71,000 tons and 40,000 tons, respectively, of refined zinc, 20.5
million ounces and 13.0 million ounces, respectively, of refined silver and
42,000 ounces and 26,000 ounces, respectively, of gold bullion. In addition, Doe
Run Peru shipped various by-products including bismuth, indium, tellurium,
antimony, cadmium and copper blister. Doe Run Peru had net sales, net income and
Adjusted EBITDA of $431.9 million, $26.4 million and $50.7 million,
respectively, for the twelve months ended October 31, 1997, including the period
from October 23, 1997 through October 31,
 
                                       65
<PAGE>
1997, and net sales, net income and EBITDA (excluding intercompany transactions)
of $224.9 million $18.9 million and $36.2 million, respectively, for the six
months ended April 30, 1998.
 
    Of Doe Run Peru's net sales, refined copper, silver, zinc, lead and gold
accounted for 35%, 23%, 19%, 15% and 3%, respectively, for the twelve months
ended October 31, 1997, and 25%, 34%, 17%, 13% and 4%, respectively, for the six
months ended April 30, 1998, with the balance of net sales derived from sales of
various by-products. For the twelve months ended December 31, 1996, Doe Run Peru
was one of Peru's largest exporters, exporting approximately 80% of its total
shipments to North America, Europe and Asia, as well as other Latin American
countries. Doe Run Peru's customers include end-users of base metals and metal
by-products, as well as international metal trading companies.
 
    Doe Run Peru's operations consist of smelting and refining complex
concentrates that it purchases from unaffiliated mining operations. Doe Run Peru
typically purchases concentrate feedstock pursuant to annual contracts at a
price based on a percentage of the payable base metal and precious metal content
of the concentrates. The price is reduced by processing fees or treatment
charges to refine the concentrates, as well as by penalties charged to remove
impurities within the concentrates, such as arsenic, antimony and bismuth. Base
metal prices, treatment charges and penalties are generally established based
upon prevailing market conditions by reference to prices in the world market,
including on the LME. Currently, Doe Run Peru has entered into supply contracts,
primarily with one-year terms, that meet approximately 95% of its concentrate
requirements for fiscal 1998.
 
    Doe Run Peru pays concentrate suppliers for the majority of the metal
content of the concentrates purchased and, thus, derives its operating profit
primarily from treatment charges and penalties. In addition, Doe Run Peru
generates operating profit from the sale of by-products, as well as from metals
sold at a premium to the price paid for such metal. Moreover, since Doe Run
Peru's metallurgical recoveries are typically in excess of the paid metal
percentages, Doe Run Peru further increases its operating profit from the sale
of the metal produced from such recoveries.
 
    The markets for Doe Run Peru's products are global and continue to grow as a
result of worldwide economic growth. Given the diversity of its products and
by-products, Doe Run Peru's financial performance is not solely dependent upon
the prospects for any one of its products or by-products. Moreover, since Doe
Run Peru is a processor of complex concentrates and does not presently own any
mines from which it sources concentrates, Doe Run Peru's financial performance
is less sensitive to the volatility of base metal prices.
 
COMPETITIVE STRENGTHS
 
    The Company believes that its competitive strengths include the following:
 
  FOCUSED BUSINESS STRATEGY
 
    The production of lead and related products is Doe Run's primary business,
whereas lead generally represents a small percentage of its competitors' overall
operations. As a result, Doe Run believes that its ability to quickly recognize
and respond to various trends that affect the lead industry and its customers
provide Doe Run with a preferred status with its customers. This responsiveness,
along with its reputation for excellent service, product quality and timely
delivery, permits Doe Run to consistently realize premiums for its products,
resulting in sales prices above the market price for lead quoted on the LME.
 
    With the assistance and direction provided by Doe Run, Doe Run Peru, as a
private enterprise, is well positioned to recognize and respond to various
trends that affect the smelting and refining industry, as well as its customers.
Doe Run Peru will implement its business strategy with the operating flexibility
to (i) make discretionary capital expenditures and (ii) purchase an optimum mix
of concentrate feedstock from a wider range of suppliers than it could under the
constraints that existed as a government-owned enterprise.
 
                                       66
<PAGE>
  DIVERSE PROCESSING CAPABILITIES
 
    The combination of Doe Run's and Doe Run Peru's processing capabilities
provides the Company greater diversity in its net sales and EBITDA.
Specifically, with the Acquisition, approximately 74% and 77% of the Company's
net sales for the twelve months ended October 31, 1997 and the six months ended
April 30, 1998, respectively, were derived from (i) the treatment and processing
of base metal concentrates, including copper, silver, zinc, lead and gold, (ii)
the fabrication of lead and lead related products, (iii) the tolling and
recycling of spent lead-acid batteries for major U.S. lead-acid battery
manufacturers and (iv) the sale of zinc and copper concentrates. Such
value-added tolling and other products and services are less sensitive to base
metal price fluctuations.
 
  FAVORABLE ACCESS TO RAW MATERIALS
 
    Peru and its neighboring Latin American countries, primarily Bolivia, are
significant producers of complex concentrates that contain multiple metals and
high levels of impurities. Doe Run Peru obtains substantially all of its lead
and zinc concentrates and approximately 80% of its copper concentrates from
Peruvian sources. Since Doe Run Peru operates one of the few complex concentrate
processing facilities in the world, Doe Run Peru obtains favorable pricing terms
from its concentrate suppliers due to the complex nature of the concentrates and
its proximity to the producing mines. As a result, Doe Run Peru believes that it
operates at a geographic competitive advantage to comparable facilities located
farther from their sources of complex concentrates. Currently, Doe Run Peru has
entered into supply contracts, primarily with one-year terms, that meet
approximately 95% of its concentrate requirements for fiscal 1998.
 
  FLEXIBLE MINING OPERATIONS
 
    Due to its extensive polymetallic ore resources, Doe Run has flexibility in
developing its mining and milling plans to take advantage of prevailing market
conditions for lead, zinc and copper. Depending on lead, zinc and copper prices,
Doe Run has the ability, to a certain extent, to optimize its mine production by
targeting certain ore grades in order to enhance operating margins. By
maintaining such flexibility, Doe Run is able to reduce its exposure to metal
price volatility.
 
  U.S. DOLLAR-BASED REVENUES
 
    The mining industry in which Doe Run Peru is a major participant is Peru's
largest export industry, representing approximately 45% of Peru's total export
sales in 1997. For the twelve months ended October 31, 1997 and the six months
ended April 30, 1998, exports accounted for 78% and 77%, respectively, of Doe
Run Peru's shipments and more than 79% and 72%, respectively, of its net sales.
In addition, substantially all of Doe Run Peru's net sales are denominated in
U.S. dollars. As a result, Doe Run Peru's net sales is less sensitive to foreign
currency fluctuations.
 
  EXPERIENCED MANAGEMENT AND LABOR FORCE
 
    Doe Run's management team has extensive experience in the mining and metals
production industry with an average of 23 years in the industry. The extensive
experience of the Doe Run management team complements the skills of Doe Run
Peru's executive personnel to provide Doe Run Peru with the strong management
team necessary to compete as a private enterprise in the world markets. In
addition, the Company employs a highly skilled workforce whose average tenure
with the Company is more than 20 years.
 
  HIGH BARRIERS TO ENTRY
 
    Management believes that the capital costs and environmental requirements
associated with constructing facilities comparable to those of the Company
result in high barriers to entry for prospective entrants. Management estimates
that it would cost approximately $700 million to establish mining, milling
 
                                       67
<PAGE>
and smelting operations with the production capacity and efficiency of Doe Run.
Moreover, management is not aware of any significant mineral deposit in North
America with lead grades and reserves similar to that of the Viburnum Trend.
With respect to Doe Run Peru, management estimates that it would cost
approximately $950 million to establish smelting and refining operations with
the production capacity and efficiency of Doe Run Peru. Management believes that
the cost and time commitment required to achieve commercial production for any
new mining, milling, smelting or processing operation, including regulatory
approvals, heightens the barriers to entry.
 
BUSINESS STRATEGY
 
    The Company's business strategy is to improve its operations and financial
performance by focusing on the following principal elements:
 
  INCREASE CAPACITY AND IMPROVE OPERATING EFFICIENCIES
 
    Doe Run is committed to improving its operating efficiencies through focused
capital investments that increase capacity utilization, enhance productivity and
lower costs. Since the acquisition of Doe Run by Renco in April 1994, Doe Run
has completed approximately $40.4 million of capital investments through April
30, 1998 designed in part to reduce production costs and improve product
quality. Additionally, Doe Run seeks to identify non-capital cost reduction
opportunities throughout its operations. Doe Run has increased its primary lead
production capacity from the original annual capacity of 225,000 tons to
approximately 250,000 tons presently with minimal capital investment. In
addition, Doe Run has increased its secondary lead production capacity from the
original annual capacity of 60,000 tons to approximately 105,000 tons presently
with minimal capital investment.
 
    The Company has identified a number of strategic initiatives designed to
improve Doe Run Peru's operating efficiencies and its competitive position
within the industry through focused capital investment. In furtherance of this
strategy, Doe Run Peru has adopted a ten-year Capital Investment Program of
approximately $300.0 million in an effort to enhance various elements of Doe Run
Peru's operations. The Capital Investment Program will target specific areas of
Doe Run Peru's facilities, such as the copper and lead circuits, to improve
product quality, increase capacity, improve productivity and reduce costs in the
targeted area, thereby enhancing Doe Run Peru's net sales and EBITDA. In
addition, the Capital Investment Program is designed to help achieve compliance
with applicable environmental standards in Peru.
 
  MAINTAIN AND BUILD STRONG RELATIONSHIPS WITH STRATEGIC CUSTOMERS
 
    Through its ongoing research and development efforts and customer service
initiatives, Doe Run strives to build and maintain strong relationships with its
customers. Since lead is Doe Run's principal business, Doe Run sales and
technical professionals are dedicated to working closely with Doe Run's
customers to be responsive to their needs, such as small order quantities,
specialized shapes, sizes and alloys, technical assistance and flexible
deliveries.
 
    As a private enterprise, Doe Run Peru is implementing many of the successful
customer service initiatives utilized by Doe Run to build and maintain strong
relationships with its customers. Such initiatives will include ongoing research
and development efforts, technical assistance and other customer service
practices that will encourage a close working relationship with Doe Run Peru's
customers. In addition, Doe Run Peru is shifting the focus of its marketing
efforts to end users of its products from international trading companies.
 
  OPTIMIZE CONCENTRATE SUPPLY AT DOE RUN PERU
 
    As a private enterprise, Doe Run Peru is endeavoring to optimize the mix of
complex concentrates from a wider range of suppliers than it purchased as a
government-owned enterprise. Historically, Doe
 
                                       68
<PAGE>
Run Peru obtained the vast majority of its concentrate requirements from
Centromin mines, typically pursuant to annual contracts. Given Doe Run Peru's
unique position as one of the few processing facilities in the world for complex
concentrates, Doe Run Peru will source its raw materials on a competitive basis
within Peru from both Centromin mines and private mines, as well as from other
Latin American suppliers. Currently, Doe Run Peru has entered into supply
contracts, primarily with one-year terms, that meet approximately 95% of its
concentrate requirements for fiscal 1998.
 
  GROW DOE RUN'S CORE LEAD BUSINESS
 
    Doe Run seeks to increase sales and operating cash flow through the growth
of its core lead operations. Such efforts include increased sales of refined
lead resulting from the expansion of its primary lead production capacity. In
addition, Doe Run strives to expand its product offerings of value-added
fabricated products including various shapes, sizes and alloys. Margins on
fabricated products are relatively insensitive to lead price fluctuations
because such fluctuations are generally reflected in the price of the end
product. Doe Run is also growing its recycling and related tolling business with
U.S. lead-acid battery manufacturers pursuant to contractual agreements under
which recycled lead is returned to the supplier in exchange for a processing
fee. Such processing fee is generally independent of lead prices.
 
  BROADEN REVENUE SOURCES THROUGH STRATEGIC ACQUISITIONS
 
    The Company seeks to broaden its revenue sources through the acquisition of
related resource assets or businesses that capitalize on the combined experience
of Doe Run and Doe Run Peru in mining, milling, smelting and refining base and
precious metals. With respect to Doe Run, such opportunities, domestic or
international, could be operations in primary or secondary lead production, lead
fabrication or non-lead resource businesses. With respect to Doe Run Peru, such
opportunities could include the acquisition of mining assets in Peru or other
Latin American countries, including, without limitation, those presently
undergoing privatization in Peru.
 
    The Acquisition reflects the Company's business strategy of broadening its
revenue sources through a strategic acquisition, focusing on treatment and
processing of base metal concentrates, as well as other metal related services.
In particular, Doe Run Peru represented a unique opportunity for Doe Run to
capitalize on Doe Run's extensive experience in efficiently managing mature
smelter operations. Through the focused investment of capital and the
implementation of Doe Run's operating practices, Doe Run Peru believes that it
will increase its refined metals capacities and improve product quality, thereby
enhancing financial performance through increased revenues and EBITDA.
 
    The Company from time to time engages in discussions with potential
acquisition targets; except as set forth herein, the Company has not entered
into any letter of intent or definitive agreement with respect to any possible
acquisition. There can be no assurance that any potential acquisition pursued by
the Company will be consummated. See "--Potential Acquisition of the ASARCO MLD"
and "Prospectus Summary-- Potential Acquisitions."
 
DOE RUN
 
  PRODUCTS AND SERVICES
 
    Doe Run's principal products include refined lead from primary and secondary
sources, fabricated products, zinc and copper concentrates and other
by-products. In addition, Doe Run provides tolling
 
                                       69
<PAGE>
services where it receives a processing fee for recycling spent lead-acid
batteries and other lead-bearing materials. The following table sets forth net
sales for each of Doe Run's products and services:
 
<TABLE>
<CAPTION>
                                                                                     YEAR ENDED OCTOBER 31,
                                                                               ----------------------------------
                                                                                  1995        1996        1997
                                                                               ----------  ----------  ----------
<S>                                                                            <C>         <C>         <C>
                                                                                     (DOLLARS IN THOUSANDS)
Primary Lead.................................................................  $  148,067  $  165,932  $  156,077
Secondary Lead: Tolling......................................................      14,435      15,119      22,369
               Metal Sales...................................................      19,156      29,782      29,039
               Other.........................................................       3,175       3,910       6,063
Fabricated Products..........................................................       1,643       9,294      24,121
Zinc Concentrates............................................................      17,694      22,363      24,772
Copper Concentrates..........................................................      11,619      12,431       8,822
Other........................................................................       9,354      16,099       6,633
                                                                               ----------  ----------  ----------
    Total....................................................................  $  225,143  $  274,930  $  277,896
                                                                               ----------  ----------  ----------
                                                                               ----------  ----------  ----------
</TABLE>
 
    PRIMARY LEAD
 
    Doe Run produces high quality refined lead products at its primary
Herculaneum smelter, including 99.99% pure lead, the purest commercial lead
available. Doe Run also provides a wide variety of product shapes and sizes, as
well as a complete series of lead alloys to meet the specialty demands of its
customers. Primary lead is used in automotive batteries, computer and television
screens, forklift, marine and golfcart batteries, stationary batteries used as
backup power sources, as well as rolled and extruded lead products in radiation
shielding and roofing materials. High purity lead is required for newer high
technology batteries, and is preferred by battery manufacturers for lead oxide,
the electrically active component of lead-acid batteries. Doe Run's lead alloy
products are used in the manufacture of numerous fabricated products, as well as
for ammunition.
 
    SECONDARY LEAD
 
    Doe Run produces secondary lead at its recycling facility located in Boss,
Missouri, where it recycles spent lead-acid batteries and other lead-bearing
materials. Of Doe Run's secondary lead production, approximately 60% is derived
from tolling arrangements with battery manufacturers. Under such multi-year
arrangements, manufacturers send spent batteries to Doe Run, which recovers the
lead and returns it to the battery manufacturer for a processing fee. As part of
such arrangements, Doe Run offers its tolling customers the opportunity to
purchase or receive primary lead or lead alloys in exchange for their spent
lead-acid batteries at specified economic terms. Due to the terms of these
arrangements, Doe Run's operating profits from this service are largely
unaffected by lead price fluctuations. In addition to revenues resulting from
tolling services, Doe Run directly sells secondary lead and recycles other
lead-bearing materials for which it receives processing fees.
 
    FABRICATED LEAD PRODUCTS
 
    Doe Run processes lead metal into custom products such as: lead oxide, the
key ingredient in lead-acid batteries; lead anode plates used in copper
refining; x-ray and radiation shields for the medical profession; roof flashings
for the construction industry; and lead for ammunition. Doe Run also installs
radiation shielding in hospitals and cancer treatment centers and installs and
maintains lead-lined storage tanks and pollution control devices for the
chemical, petroleum and smelting industries. Margins on Doe Run's sales of
value-added products are relatively insensitive to lead price fluctuations, as
Doe Run generally is able to reflect such fluctuations in the price of the end
product.
 
                                       70
<PAGE>
    ZINC CONCENTRATES
 
    Doe Run mines zinc as a by-product of its lead-mining operations. Zinc
concentrates are sold on the open market or to zinc smelters. In fiscal 1997,
Doe Run produced approximately 70,000 tons of zinc concentrates, with an average
metal content of 59.6% zinc.
 
    COPPER CONCENTRATES
 
    Doe Run mines copper as a by-product of its lead operations. Copper
concentrates are sold on the open market or to copper smelters. In fiscal 1997,
Doe Run produced approximately 27,000 tons of copper concentrates, with an
average metal content of 29.1% copper.
 
    OTHER PRODUCTS AND SERVICES
 
    Doe Run produces various other by-products resulting from the production of
lead. Such products include sulfuric acid which is sold to fertilizer
manufacturers, as well as primary and secondary furnace drosses, which are sold
to custom smelters for further recovery of various minerals. The secondary
facility also sells polypropylene and sodium sulfate and provides other
services, including stripping of lead-sheathed cable and recycling of various
hazardous materials.
 
  MARKETING AND SALES
 
    Doe Run's marketing and sales strategy is to maximize the net realized
selling prices for its products. In furtherance of this strategy, Doe Run
provides its customers small order quantities, specialized shapes, sizes and
alloys, technical assistance and flexible deliveries.
 
    Doe Run generally sells lead on a delivered basis with freight charges
included. Doe Run's central U.S. location allows it to have transportation costs
significantly lower than its major competitors with operations outside of North
America. Moreover, due to its location, Doe Run is able to provide its customers
just-in-time delivery at a lower cost than most of its competitors.
 
    Doe Run is actively involved with several customers in developing new uses
for lead. Such uses include lead foil for advanced lead-acid batteries, low
radiation lead solder for printed circuit boards and superior lead alloys for
optimizing battery performance.
 
    Zinc and copper concentrates generally are sold to North American smelters
pursuant to multi-year (typically three year) contracts awarded under a bid
process. Due to Doe Run's geographic location, transportation costs for its zinc
and copper concentrates are low relative to its competitors' costs. Similar to
lead, transportation costs are a significant factor in selling concentrates.
 
    Doe Run's sales of lead metal, concentrates and by-products are handled by
Doe Run's staff of direct sales people assisted by customer service
representatives. Technical assistance is provided by plant operating personnel.
 
  CUSTOMERS
 
    Doe Run had approximately 160 lead metal customers in fiscal 1997, of which
the five largest accounted for approximately 41% of Doe Run's lead metal net
sales. Approximately 70% of Doe Run's lead sales were pursuant to contractual
agreements, typically one year or less. Such contracts generally set forth
minimum volume and pricing terms. Exports represented approximately 7% of Doe
Run's net sales in fiscal 1997.
 
                                       71
<PAGE>
    Doe Run's customers include six of the seven largest lead-acid battery
manufacturers in the world which accounted for approximately 40% of Doe Run's
net sales in fiscal 1997, including JCI which purchased lead and tolling
services representing approximately 12% of Doe Run's fiscal 1997 net sales. In
addition, Big River, a producer of zinc metal and associated co-products,
purchased zinc concentrates, which represented approximately 10% of Doe Run's
net sales in fiscal 1997. No other single customer accounted for more than 10%
of Doe Run's net sales in fiscal 1997. The loss of any of Doe Run's largest
customers or curtailment of purchases by such customers could have a material
adverse effect on the results of operations, financial condition and liquidity
of Doe Run. As a result of the Acquisition, however, no single customer is
expected to account for more than 10% of the Company's net sales in fiscal 1998.
 
  COMPETITION
 
    Doe Run is the largest fully-integrated lead producer in North America and
the second largest primary lead producer in the western world. The leading
producer of lead in the world is Quexco Incorporated ("Quexco"), with operations
in Europe, as well as North America where Quexco operates secondary operations
under the name of RSR Corporation ("RSR"). Metaleurop S.A. is a significant
European producer of both primary and secondary lead. In North America, Doe
Run's principal competitors in primary lead include Cominco Ltd., Noranda Inc.
and Industrias Penoles S.A. In secondary recycling of lead, Doe Run competes
with Exide, which is also a customer of Doe Run, GNB Inc., RSR and several other
smaller industry participants.
 
  PRODUCTION PROCESS
 
    Doe Run produces refined lead metal from its primary processing facility, as
well as through its secondary recycling operations. Summarized below is a
description of the production process for primary and secondary lead production.
 
    PRIMARY
 
    The production of lead involves three major stages: mining, milling and
smelting.
 
   
    MINING AND MILLING.  Doe Run operates six production shafts and four
processing mills. Doe Run's polymetallic ore bodies are mined using the "room
and pillar" method. With this method, ore is removed by blasting in a manner
that leaves pillars to support the rooms created by the removed ore. Mining
involves drilling and blasting limestone rock 500 to 1,000 feet below the
earth's surface. The ore is hauled by large, diesel-powered equipment before
being hoisted above ground to the mill. During fiscal 1997, Doe Run's mining
operations produced in excess of 5.0 million tons of ore, containing average
grades of 5.17% lead, 1.02% zinc and 0.27% copper.
    
 
    The milling process includes further crushing and grinding, subsequent to
which the ore is treated in a flotation process to separate and concentrate the
minerals. The milling process recovers payable minerals from the ore. The
remaining materials, or tailings, are sent to settling ponds near the mill
sites, which are operated and maintained to ensure groundwater purity.
 
    The final products are lead, zinc and copper concentrates that are shipped
off-site for smelting. The lead concentrates are shipped to the Herculaneum
smelter, while zinc and copper concentrates are marketed to other firms.
 
    SMELTING.  Located on the Mississippi River, south of St. Louis, the
Herculaneum smelter is the largest lead smelter in North America and the second
largest in the world. The smelter commenced operations in 1892 and has been in
continuous operation since that time, processing lead concentrates from Doe
Run's mining and milling operations. The smelter has a capacity of 250,000 tons
per year and utilizes a pyrometallurgical process to produce 99.99% refined
lead.
 
    The annual capacity of the smelter was recently upgraded to approximately
250,000 tons following the introduction of certain process control improvements
at the blast furnace and other plant modifications.
 
                                       72
<PAGE>
Doe Run is in the process of further increasing the capacity to approximately
270,000 tons per year. Doe Run recently completed construction of a $7.2 million
550-foot tall emissions stack that has allowed production capacity to increase
at its primary smelter and improved the facility's environmental performance.
 
    Consistent with Doe Run's commitment to product quality and customer
service, in January 1998, Doe Run's Herculaneum facility obtained ISO 9002
certification, an internationally recognized quality system standard.
 
    SECONDARY
 
    Located in Boss, Missouri, Doe Run's recycling facility processes spent
lead-acid batteries and other lead-bearing materials. The facility is a Resource
Conservation Recovery Act approved site. The facility employs a sophisticated
monitoring system to prevent leaks from penetrating the surrounding environment.
In fiscal 1997, the facility reclaimed approximately 105,000 tons of refined
lead. Approximately 60% of this total results from tolling contracts, while 53%
of the total supply resulted from automobile batteries. Production capacity has
been increased to approximately 110,000 tons currently from the original
capacity of 60,000 tons with minimal capital investment.
 
    At Doe Run's recycling facility, whole batteries are dismantled in a hammer
mill, and the components are recovered by a combination of screening and gravity
separation in water columns. Grids and posts are collected in a bin,
polypropylene is loaded into trucks and lead paste is separated for further
treatment. Grids and posts are melted in a rotary furnace to produce antimonial
lead alloys. The paste is processed in a reverberatory furnace to produce pure
lead and a high antimony slag which is further processed in a blast furnace to
recover additional lead, antimony and tin. The remaining slag is disposed of as
a non-hazardous material at a licensed facility. Management believes this
recycling facility generates two-thirds less waste than traditional battery
recycling facilities.
 
    Consistent with Doe Run's commitment to product quality and customer
service, in April 1997, Doe Run's recycling facility obtained ISO 9002
certification.
 
                                       73
<PAGE>
  MINING OPERATIONS
 
   
    Doe Run's operations are centered around the ore-rich Viburnum Trend in
Southeastern Missouri as illustrated below.
    
 
                                 [MAP]
 
- ------------------------
 
   
+   Smelting operations
    
 
   
++   Mining and milling operations
    
 
                                       74
<PAGE>
    GEOLOGY
 
   
    Approximately 500 million years ago, the Precambrian core of the St.
Francois Mountains formed a group of islands. The water around these islands was
shallow, and algae formed a reef around them. Over time, the islands and the
reef were covered by sea water and layers of sediment. These layers eventually
hardened into rock. Mineral-bearing fluids flowed through the rock, depositing
substantial amounts of lead, zinc and copper near and in the reef. Portions of
this reef and surrounding areas contain valuable mineral deposits now known as
the Viburnum Trend.
    
 
    Doe Run's Viburnum Trend ore body is predominantly in the Bonne Terre
geologic formation, which is dolomitic limestone. The principal metallic
constituents are lead, zinc and copper, with trace amounts of silver. The ore
body being mined is an irregular mass of sulfide ores, principally lead, zinc
and copper sulfides, approximately 1,000 feet in depth and with varying widths
of up to 2,000 feet.
 
    PRODUCTION SHAFTS
 
    Doe Run's mining operations utilize six production shafts that form a
north-south line along approximately 40 miles of its Viburnum Trend ore body.
Three production shafts, Viburnum-28, Viburnum-29 and Viburnum-35, lie within a
five-mile radius east, north and south, respectively, of Viburnum, Missouri. The
Buick, Brushy Creek and Fletcher production shafts are five miles, sixteen miles
and twenty miles, respectively, south of Viburnum, Missouri. All of Doe Run's
mining and milling facilities are accessible by state or county roads or
Company-owned haul roads. Products are shipped by truck over public roads or by
rail, with rail loading capabilities at two of Doe Run's mining facilities.
 
    Five of the production shafts, Viburnum-28, Viburnum-29, Viburnum-35, Brushy
Creek and Fletcher, were developed by predecessors of Doe Run. The sixth
production shaft, Buick, was developed and initially operated by a joint venture
of Homestake Mining Company and American Metal Climax (the "Homestake Joint
Venture") in the 1960s. In 1986, the Buick mining operations became part of Doe
Run's Predecessor.
 
    Doe Run owns the property where the necessary surface structures for mining
and milling are located. The mineral rights are held either by fee title or
mineral leases with either private landowners or the federal government. There
are numerous mineral exploration leases, most of which are for exploration of
new mineral ore deposits. Four of the production leases are private leases, and
nine are government leases. The mineral leases with private landowners have no
expiration periods. The government leases are for a period of ten years and are
renewable. The related mining operations are conducted pursuant to four
development contracts, which also are for ten years subject to renewal. The
Viburnum, Fletcher, Buick and Brushy Creek development contracts consist of
four, two, one and two leases, respectively, which are due for renewal March 31,
2018, May 31, 2003, October 31, 2004 and May 31, 2003, respectively. Doe Run is
required to make royalty payments under the leases.
 
    The production shafts are approximately 1,000 feet deep, with the exception
of Viburnum-28 and Viburnum-29 which are 800 feet and 500 feet deep,
respectively. All mining by Doe Run is performed underground on one level by the
room and pillar method. Blasting typically is accomplished by using an ammonium
nitrate fuel oil mix; however, dynamite is used under wet conditions. Front-end
loaders are used to load the blasted ore onto trucks that haul the ore from the
production face to the production shaft.
 
    Doe Run maintains fleets of trucks, drilling equipment and loading
equipment, which generally are rubber-tired and diesel-powered, at each of its
production shafts. The equipment is of various ages, and much of the older
equipment has been upgraded or rebuilt. Doe Run employs a computerized
maintenance scheduling and tracking system that directs and monitors preventive
maintenance and repair activities of all equipment. In addition to maintaining
its existing equipment, Doe Run has recently acquired or leased new equipment
which enhances operating efficiencies, such as low-profile equipment capable of
operating in ten-foot openings rather than the standard twelve-foot openings and
drilling equipment for removal of pillars in excess of 40 feet in height.
 
                                       75
<PAGE>
    EXPLORATION
 
    Doe Run continues to explore actively within the Viburnum Trend and
historically has replaced a significant portion of annual production with new
reserves. A development project is on-going in the northern section of the
Viburnum-28 mining area with a view to opening additional ore reserves. In
addition, limited surface exploration drilling is being conducted in this area.
Doe Run is engaged in limited surface diamond drilling beyond the extreme north
and south ends of the Viburnum-29 mining area. At Viburnum-35, development
activity is focused on developing the eastern blanket ore body access, and in
the northern section of the mining area, following the main mineralization
trend. Doe Run has initiated a 4,500-foot drift from the northern end of the
Brushy Creek mining area to the southern extremity of the Buick mining area.
Surface exploration drilling continues in areas south of the present Brushy
Creek mining area. Exploration is being actively pursued south of the Fletcher
mining area, where mineralization is present but not yet delineated sufficiently
to constitute ore reserves. Doe Run also holds exploration tracts outside the
Viburnum Trend, which are being actively explored. In fiscal 1997, Doe Run spent
$6.2 million on exploration activities, including $2.6 million outside the
Viburnum Trend.
 
    FACILITIES
 
    The following table sets forth the location of and certain other information
about Doe Run's facilities:
 
<TABLE>
<CAPTION>
                                                                                                      SIZE
                                                                                            -------------------------
FACILITY                                                                 LOCATION              LAND        FACILITY
- --------------------------------------------------------------  --------------------------  -----------  ------------
<S>                                                             <C>                         <C>          <C>
                                                                                                           (SQUARE
                                                                                              (ACRES)       FEET)
MINING AND MILLING:
Viburnum (three production shafts)............................  Viburnum, Missouri                 679       139,000
Buick.........................................................  Boss, Missouri                      82       144,000
Brushy Creek..................................................  Bunker, Missouri                   400        92,000
Fletcher......................................................  Bunker, Missouri                   162        88,000
 
SMELTING:
Herculaneum--Primary..........................................  Herculaneum, Missouri              235       365,000
Buick--Secondary..............................................  Boss, Missouri                     193       200,000
 
FABRICATING:
Seafab(a).....................................................  Casa Grande, Arizona            (b)           75,000
                                                                Seattle, Washington             (b)           43,000
                                                                Vancouver, Washington           (b)           15,000
Lone Star.....................................................  Houston, Texas                  (b)           33,000
</TABLE>
 
- ------------------------
 
(a) FPI is currently relocating its remaining lead oxide manufacturing
    operations from the Seattle facility to Vancouver, Washington. Upon
    completion of the relocation, the Seattle facility will be closed.
 
(b) This facility is leased.
 
    Doe Run operates four mills. The Viburnum mill is located on the eastern
edge of Viburnum, Missouri, and has the largest capacity of any mill in the area
with its 12,000 ton per day concentrator. Ores from Viburnum-28, Viburnum-29 and
Viburnum-35 are processed at the Viburnum mill. The Buick mill is located at the
site of the Buick production shaft, and its concentrator has a capacity of 7,200
tons per day. Ores from Buick and Brushy Creek are processed at the Buick mill.
The Fletcher mill is located at the site of the Fletcher production shaft, and
its concentrator has a capacity of 5,000 tons per day. The Fletcher mill
processes ores from the Fletcher production shaft. The Brushy Creek mill is
located at the site of the Brushy Creek production shaft, and its concentrator
has a capacity of 5,000 tons per day. At the Viburnum mill and Buick mill, lead
concentrates are placed in rail cars for transport to the Herculaneum smelter;
however, the Fletcher mill does not have rail access, and accordingly, lead
concentrates are first trucked to
 
                                       76
<PAGE>
the Buick mill for transport by rail. Zinc and copper concentrates are shipped
from the mills to smelter customers by rail or truck.
 
    The Herculaneum primary lead smelter is located approximately 35 miles south
of St. Louis on the Mississippi River in Herculaneum, Missouri. The St. Joseph
Lead Company, a predecessor of Doe Run, built the first smelting operation on
the property in 1892. The last reconstruction of the smelter facility was in the
mid-1960's. Doe Run owns the smelter property.
 
    The recycling facility, with its secondary smelter, located in Boss,
Missouri, was constructed in 1991, on the site of a former primary lead smelter.
The recycling facility utilizes some of the existing structures and equipment
from the primary lead smelter. The primary smelter was originally owned and
operated by the Homestake Joint Venture. This property was also acquired
initially by Doe Run's Predecessor.
 
    In addition to ongoing capital investments, Doe Run has expended an average
of approximately $59.5 million per year on maintenance during fiscal 1995
through 1997. As a result of these expenditures and ongoing efforts, Doe Run
believes that it operates and will continue to maintain modern and efficient
facilities.
 
    ELECTRICAL POWER
 
    The electric power source for all the facilities, except Viburnum-35, is
Union Electric Company, a public utility headquartered in St. Louis, Missouri.
Viburnum-35 obtains its electric power from Black River Co-op.
 
  RESERVES
 
   
    As of March 31, 1998, Doe Run's Viburnum Trend ore reserves consisted of
approximately 8.9 million proven tons, containing grades of 8.50% lead, 1.72%
zinc and 0.40% copper, and 55.2 million probable tons, containing grades of
4.97% lead, 1.05% zinc and 0.24% copper. The term "reserve" means that part of a
mineral deposit which could be economically and legally extracted or produced at
the time of the reserve determination. The term "proven (measured) reserves"
means reserves for which (a) quantity is computed from dimensions revealed in
outcrops, trenches, workings or drill holes; grade and/or quality are computed
from the results of detailed sampling and (b) the sites for inspection, sampling
and measurement are spaced so closely and the geologic character is so well
defined that size, shape, depth and mineral content of reserves are
well-established. The term "probable (indicated) reserves" means reserves for
which quantity and grade and/or quality are computed from information similar to
that used for proven (measured) reserves, but the sites for inspection,
sampling, and measurement are farther apart or are otherwise less adequately
spaced. The degree of assurance, although lower than that for proven (measured)
reserves, is high enough to assume continuity between points of observation.
    
 
                                       77
<PAGE>
   
    The following tables sets forth the mineable reserves and mineral deposit as
of March 31, 1998 for Doe Run's Viburnum Trend ore body, which have been audited
by Pincock, Allen & Holt, Lakewood, Colorado, an international mineral industry
consulting firm.
    
 
                        RESERVE AUDIT--MINEABLE RESERVES
                              AS OF MARCH 31, 1998
 
   
<TABLE>
<CAPTION>
                                                                                               GRADE+
                                                                                  ---------------------------------
                                                                       TONS         LEAD       ZINC       COPPER
                                                                   -------------  ---------  ---------  -----------
                                                                        (IN
                                                                    THOUSANDS)
<S>                                                                <C>            <C>        <C>        <C>
Proven...........................................................        8,916         8.50%      1.72%       0.40%
Probable.........................................................       55,150         4.97       1.05        0.24
                                                                   -------------  ---------        ---         ---
    Total........................................................       64,066         5.46       1.20        0.28
                                                                   -------------  ---------        ---         ---
                                                                   -------------  ---------        ---         ---
</TABLE>
    
 
   
                         RESERVE AUDIT--MINERAL DEPOSIT
                              AS OF MARCH 31, 1998
    
 
   
<TABLE>
<CAPTION>
                                                                                       GRADE+
                                                                          ---------------------------------
                                                                TONS        LEAD       ZINC       COPPER
                                                             -----------  ---------  ---------  -----------
                                                                 (IN
                                                             THOUSANDS)
<S>                                                          <C>          <C>        <C>        <C>
Mineral Deposit............................................     121,960        4.76%      0.93%       0.23%
                                                             -----------  ---------        ---         ---
                                                             -----------  ---------        ---         ---
</TABLE>
    
 
- ------------------------
 
   
+   Estimated average metallurgical recoveries for lead, zinc and copper are
    95.70%, 81.40% and 57.50%, respectively.
    
 
   
    The term "mineral deposit" or "mineralized material" means a mineralized
body which has been delineated by appropriately spaced drilling and/or
underground sampling to support a sufficient tonnage and average grade of
metal(s). Such a deposit does not qualify as a reserve, until a comprehensive
evaluation based upon unit cost, grade, recoveries, and other material factors
conclude legal and economic feasibility.
    
 
                                       78
<PAGE>
  MINING AND MILLING
 
    The following table sets forth production information for Doe Run's mining
and milling operations for the three years ended October 31, 1997.
 
<TABLE>
<CAPTION>
                                                                                               YEAR ENDED OCTOBER 31,
                                                                                           -------------------------------
                                                                                             1995       1996       1997
                                                                                           ---------  ---------  ---------
<S>                                                                                        <C>        <C>        <C>
Wet tons (in thousands) of ore milled....................................................      3,956      4,869      5,168
No. of operating days....................................................................        252        253        252
Average tons (in thousands) per operating day............................................         16         19         21
Average ore grade:
  Lead...................................................................................        5.7%       5.2%       5.2%
  Zinc...................................................................................        1.1%       1.1%       1.0%
  Copper.................................................................................        0.3%       0.3%       0.3%
Lead concentrate:
  Tons (in thousands)....................................................................        267        303        314
  Average Lead grade.....................................................................         76%        77%        79%
  Tons (in thousands) of lead metal contained in concentrate.............................        204        234        247
Zinc concentrate:
  Tons (in thousands)....................................................................         54         69         70
  Average Zinc grade.....................................................................         59%        59%        60%
  Tons (in thousands) of zinc metal contained in concentrate.............................         32         40         42
Copper concentrate:
  Tons (in thousands)....................................................................         25         31         27
  Average Copper grade...................................................................         29%        28%        29%
  Tons (in thousands) of copper metal contained in concentrate...........................          7          9          8
</TABLE>
 
  RAW MATERIALS
 
    Doe Run's operations utilize various raw materials, principally coke,
electricity, natural gas, propane and spent batteries. Doe Run believes that it
has adequate sources of these raw materials to meet its present production
needs.
 
  ENVIRONMENTAL MATTERS
 
    Doe Run is subject to numerous federal, state and local environmental laws
and regulations governing, among other things, air emissions, waste water
discharge, solid and hazardous waste treatment, and storage, disposal and
remediation of releases of hazardous materials. In common with much of the
mining industry, Doe Run's facilities are located on sites that have been used
for heavy industrial purposes for decades and may require remediation.
Environmental laws and regulations may become more stringent in the future which
could increase costs of compliance.
 
   
    Doe Run is a defendant in several lawsuits alleging certain damages from
lead emission stemming from the operations at the Herculaneum smelter. The cases
brought in the Circuit Court, 23rd Judicial Circuit at Hillsboro, Jefferson
County, Missouri are: KARLA RICHARDSON, ET AL. V. THE DOE RUN RESOURCES CORP.,
ET AL., Case No. 195-5492-CC-J4, filed September 12, 1995; SARA DIXON, ET AL. V.
THE DOE RUN RESOURCES CORP., Case No. 195-5112 CC-J1, filed August 25, 1995;
RONALD HEATH, ET AL. V. THE DOE RUN RESOURCES CORP. ET AL., Case No.
195-6936-CC-J2, filed November 20, 1995; and ANDREA MASSA, ET AL. V. THE DOE RUN
RESOURCES, ET AL., Case No. 195-7290-CC-J3, filed December 8, 1995. The DIXON
and HEATH cases are class action lawsuits. In the DIXON case, the plaintiffs are
seeking to have certified two separate classes. The first class consists of
property owners in a certain section of Herculaneum, alleging that property
values have been damaged due to the operations of the smelter. The second class
is children who lived in Herculaneum during a period of time when they were six
months to six years old, and the remedy sought is medical monitoring for the
class. The HEATH case is seeking certification of a class of property owners
allegedly damaged by operations from the smelter, but the potential size of the
class is every home in
    
 
                                       79
<PAGE>
Herculaneum, Missouri. The RICHARDSON and MASSA cases are personal injury
actions by fourteen individuals collectively who allege damages from the effects
of lead poisoning due to operations at the smelter. Punitive damages also are
being sought in each of the RICHARDSON and MASSA cases. Doe Run is vigorously
defending all of these claims. Preliminary investigation and research by Doe Run
indicates property values in Herculaneum are consistent with those of
surrounding communities and have not been affected by the smelter. Finally,
based on rules for class certification, Doe Run believes class certification is
not appropriate. However, because the cases are in the early stages of
discovery, Doe Run is unable at this time to state with certainty the expected
outcome of and the final costs of any of these cases. Therefore, there can be no
assurance that these cases would not have a material adverse effect on the
results of operations, financial condition and liquidity of Doe Run.
 
    Primary smelter slag produced by and stored at the Herculaneum smelter is
currently exempt from hazardous waste regulation under the Resource Conservation
and Recovery Act of 1976, as amended ("RCRA"). However, the EPA recently
published a proposed rule which, if adopted, would require this slag to be
managed as a hazardous waste. Certain other waste materials, including baghouse
dust, generated at the smelter and now recycled in the smelter may also become
regulated as hazardous wastes. At this time, Doe Run cannot predict the final
outcome of the EPA's proposed rule. However, if the slag or other wastes at the
smelter are regulated as hazardous waste, Doe Run may be required to take
corrective action under RCRA at the smelter, as well as to adopt stricter
management practices for these wastes, which could have a material adverse
effect on the results of operations, financial condition and liquidity of Doe
Run. Disposal of the slag at the plant site as a hazardous waste could result in
potential capital and operating costs of approximately $1.0 million per year.
 
    The area surrounding the Herculaneum smelter currently is out of compliance
with the ambient air quality standard for lead promulgated under the federal
Clean Air Act. Doe Run is working with regulators to develop a new three-year
compliance plan to begin after fiscal 1998 to implement identified control
measures. Under the Clean Air Act, there are no penalties for failure to meet
the ambient air quality standard. Nevertheless, penalties could be imposed
should Doe Run fail to meet the terms of the new three-year compliance plan. Doe
Run expects to make capital expenditures for additional control measures
totaling approximately $2.8 million for fiscal 1998 while the plan is developed
and anticipates a minimum total amount of $3.0 million for the three-year plan.
 
    Doe Run has received notice that it is a potentially responsible party
("PRP") subject to liability under the Comprehensive Environmental Response,
Compensation and Liability Act of 1980, as amended ("CERCLA"), at the following
sites: four sites in St. Francois County, Missouri, including the Big River Mine
Tailings site, the Bonne Terre site, the Federal site and the National site; the
Oronogo-Durenweg site in Jasper County, Missouri; the Cherokee County site in
Cherokee County, Kansas; the Tar Creek site in Ottawa County, Oklahoma; the
Block "P" site in Cascade County, Montana; and the Missouri Electric Works site
in Cape Girardeau, Missouri. There are four additional sites in St. Francois
County for which the EPA has indicated it will issue notice. These sites involve
historical operations of predecessors of Doe Run. CERCLA provides for strict
and, in certain circumstances, joint and several liability for response costs
and natural resource damages. Doe Run has a reserve as of October 31, 1997 of
$17.8 million for these sites, including the four additional sites in St.
Francois County, which Doe Run believes is adequate based on its investigations
to date. However, depending upon the types of remediation required and certain
other factors, costs at these sites, individually or collectively, could have a
material adverse effect on the results of operations, financial condition and
liquidity of Doe Run.
 
    Doe Run signed a voluntary Administrative Order of Consent ("AOC") in 1994
with the EPA to remediate the Big River Mine Tailings Site. In February 1997,
Doe Run signed an AOC to perform an Engineering Evaluation/Cost Analysis on the
Bonne Terre Site. In addition to remediating the mine waste areas at these
sites, Doe Run has signed an AOC with the EPA to conduct a Remedial
Investigation/ Feasibility Study ("RIFS") to assess potential off-site impacts
of site operations on and the need for remediation regarding groundwater,
residential soils, several creeks and a river. The RIFS is being
 
                                       80
<PAGE>
conducted by a third party and is approximately one-half complete, with
completion expected within one year. Doe Run believes the current reserves
assigned to these sites are adequate. However, should remediation goals or areas
change, requiring substantially increased measures, there can be no assurance
that the reserves would be adequate.
 
    Doe Run has been advised by the EPA that it is considering taking certain
response actions at a mine site in Madison County, Missouri known as the LaMotte
Site. A predecessor of Doe Run was a former operator of the site. The EPA has
not decided whether any action will be taken, but held a meeting with Doe Run
and two other PRPs at the site on June 17, 1998 to discuss possible future
response actions. This site is substantially smaller than the sites in St.
Francois County where Doe Run has been named a PRP, and the potential issues are
less complex. At this time, based on this preliminary meeting and an inspection
of the site, management does not believe that any future action will result in a
material adverse impact to the results of operations, financial condition or
liquidity of Doe Run.
 
    The Block "P" site in Montana was a polymetallic mine with a waste facility
located on U.S. Forest Service land. Studies of the tailings site, mine and
potential impacts on surface water have been requested by the State of Montana.
 
    Doe Run has been sued for contribution for superfund remediation costs in
RSR CORPORATION AND QUEMETCO V. AVANTI, ET AL., filed on October 11, 1995 in the
United States District Court for the Southern District of Indiana. The site in
question, known as the Avanti Site located in Indianapolis, Indiana, was a
secondary smelter formerly owned by a subsidiary of Doe Run which was sold to
RSR in 1972. RSR has entered into an AOC with the EPA to remediate the Avanti
Site and claims that Doe Run should reimburse a portion of its costs. It is Doe
Run's position that RSR assumed the liabilities of Doe Run's former subsidiary
and, in any event, Doe Run has no liability for any acts of its former
subsidiary. In June 1996, the EPA issued an order under Section 106 of CERCLA to
Doe Run requesting it to make a good faith offer of participation to RSR.
Although Doe Run believes it has no liability to RSR, and there are other PRPs
named by the EPA and by RSR as defendants in the litigation, Doe Run made what
it considers to be a good faith participation offer to RSR of $112,500 which was
not accepted. The estimated cost of the selected remedy for the site is $7.0 to
10.0 million. Doe Run does not believe that resolution of this matter will have
a material adverse effect on the results of operations, financial condition and
liquidity of Doe Run.
 
    Doe Run's recycling facility is subject to corrective action requirements
under RCRA, as a result of a storage permit for certain wastes issued in 1989.
This has required and may involve future remediation of solid waste management
units at the site. Although it is not possible to predict whether completed
actions will be approved or new actions required, Doe Run has reserves as of
October 31, 1997 of $1.9 million for future corrective actions and $2.6 million
for closure costs for the permitted storage area.
 
   
    Under the Clean Air Act Amendments of 1990, Congress required the EPA to
study certain industry sectors to determine Maximum Achievable Control
Technology ("MACT") for each sector. A MACT rule has been adopted which could
require substantial capital and operating expenses for the recycling facility.
Doe Run challenged the rule by filing a petition for review with the United
States Court of Appeals, D.C. Circuit, on August 21, 1995. A settlement with the
EPA was reached and published in the Federal Register, which diminishes the need
for additional compliance costs. The EPA is also reviewing MACT for primary
smelters and in April 1998 proposed a rule to regulate air toxics from primary
lead smelters. In the event a MACT rule for primary smelters is adopted by the
EPA, the rule could increase compliance costs at the Herculaneum smelter by
increasing the costs of administrative reporting requirements. The proposed MACT
will also impose additional storage costs.
    
 
    Doe Run's operating facilities have waste water discharge permits issued
under the federal Clean Water Act, as amended. It is expected that stricter
discharge limits than previously in effect will be included in permits now
subject to renewal. As a result, there will be additional treatment facilities
required with an
 
                                       81
<PAGE>
anticipated total capital expenditure of $4.0 million over the next five years
to meet applicable permit requirements. There will be no appreciable increase in
operating costs.
 
    Doe Run's mining and milling operations include five mine waste disposal
facilities that are subject to Missouri mine closure permit requirements. Doe
Run has begun certain closure requirements ahead of closure and is also accruing
for the cost of ultimate closure at a rate of approximately $.3 million per year
and has a reserve as of October 31, 1997 of $4.8 million.
 
    Doe Run has a total reserve as of October 31, 1997 of $28.3 million for
CERCLA response costs, corrective action and closure costs as discussed above,
$17.8 million of which is for CERCLA response costs.
 
    Doe Run expended on all environmental matters, which includes amounts
capitalized, amounts charged to operating expense and amounts charged to
reserves, approximately $17.5 million in fiscal 1997, and estimates such
expenditures will be $16.0 million and $14.5 million in fiscal 1998 and 1999,
respectively.
 
  SAFETY
 
    Throughout its operations, Doe Run strongly emphasizes providing employees a
safe working environment through extensive training of employees to ensure safe
work practices and worker knowledge of proper equipment operation. Doe Run's
mining and milling operations are regulated by MSHA and its smelting and
fabricating operations by OSHA.
 
    Doe Run believes it has achieved safety results that are among the best in
its industry classifications. Each year since 1973, one of Doe Run's mining
units has been named either the safest or second safest underground metal mine
in the United States by MSHA. Doe Run has achieved the top award ten times in
the last 22 years. Doe Run's smelting operations have achieved a strong safety
record as well, with typical loss rates averaging approximately three to four
times better than industry averages in recent years.
 
  EMPLOYEES
 
    As of April 30, 1998, Doe Run had 343 active salaried employees and 985
active hourly employees. As of April 30, 1998, seven active hourly employees at
Seafab were represented by the Sheet Metal Workers' Union, Local No. 66 and
subject to a collective bargaining agreement providing for, among other things,
wages, work conditions and benefits. Management believes that its labor
relations are good.
 
  BENEFIT PLANS
 
    PENSION
 
    Doe Run has defined benefit retirement plans for all salaried employees,
hourly employees in Viburnum and Boss and hourly employees in Herculaneum. An
investment committee establishes a funding policy for each plan and determines
the contributions to be made to each plan by Doe Run. An eligible salaried
employee who reaches age 65 receives a right to a nonforfeitable normal
retirement annuity equal to 1.5% of his final average salary multiplied by the
number of years of his service; eligible hourly employees in Southeast Missouri
and in Herculaneum receive a nonforfeitable pension equal to a monthly amount of
$25 for each year of service. Salaried employees and hourly employees at both
sites who work past the age of 70 1/2 will receive an in-service retirement
annuity (based on the same formula) and an in-service monthly pension,
respectively. The amount payable under each plan is reduced by the value of
benefits each employee received or is entitled to receive under another
retirement plan of Doe Run, under retirement plans of Doe Run's Predecessor and
certain companies acquired by Doe Run's Predecessor or under any other plan to
which Doe Run has contributed other than profit sharing or stock bonus plans.
 
                                       82
<PAGE>
    SUPPLEMENTAL EMPLOYEE RETIREMENT PLAN
 
    Doe Run has a supplemental retirement plan for employees who participate in
Doe Run's pension plans but whose benefits are reduced by the Internal Revenue
Code (the "Code"). Under this plan, Doe Run pays eligible employees a benefit
equal to the difference between the retirement benefit the employee would have
received under the pension plan if the Code were disregarded and the retirement
benefit the employee actually is entitled to receive under the pension plan.
 
    PROFIT SHARING PROGRAM
 
    Eligible employees participate in a Profit Sharing Program under which Doe
Run pays 15% of pre-tax income, as defined in the Profit Sharing Program, into a
profit sharing pool at the conclusion of each fiscal year. If pre-tax income
does not exceed $10.0 million, the profit sharing pool will be distributed to
eligible employees in the form of a contribution to Doe Run's Savings Resource
Plan (the "401(k) Plan"). If pre-tax income exceeds $10.0 million, the first
$1.5 million of the pool will be distributed as a contribution to the 401(k)
Plan, and the remaining amount will be distributed in two phases to eligible
employees in the form of cash payments. The first phase is a partial
distribution based on a preliminary pool calculated from Doe Run's unaudited
fiscal year-end financial information, and the second phase is a distribution of
any remainder based on a final pool calculated from Doe Run's final audited
fiscal year-end financial information. Allocation of the cash payments shall be
on the basis of each eligible employee's total fiscal year base pay as a
percentage of all eligible employees' total fiscal year base pay. Every employee
on the payroll of Doe Run is eligible to participate in any cash distribution;
however, participation in a distribution to the 401(k) Plan shall be in
accordance with the 401(k) Plan.
 
    GAINSHARING PLAN
 
    Doe Run's employees participate in a gainsharing plan under which Doe Run
pays a bonus based on performance in key result areas. On a monthly and yearly
basis, Doe Run determines an improvement factor based on performance in areas
such as production (volumes, costs and efficiencies), profit margins, safety and
environmental, as well as other key operating areas. Each individual
participant's profit share is determined by multiplying this factor by a salary
component.
 
  PENDING LITIGATION
 
    Doe Run is involved in various claims and lawsuits incidental to the
ordinary course of its business that are not expected to have a material adverse
effect on the results of operations and financial condition of Doe Run.
 
    For a description of pending litigation related to environmental matters,
see "--Environmental Matters."
 
DOE RUN PERU
 
  PRODUCTS
 
    Doe Run Peru's principal products include refined copper, silver, zinc, lead
and gold. In addition, Doe Run Peru produces a variety of by-products, including
bismuth, indium, tellurium, antimony, cadmium,
 
                                       83
<PAGE>
selenium, sulfuric acid, zinc-silver concentrate, zinc sulfate, copper sulfate,
arsenic trioxide and others. The following table sets forth net sales for each
of Doe Run Peru's principal products.
<TABLE>
<CAPTION>
                                                                                            TWELVE MONTHS ENDED
                                                            YEAR ENDED DECEMBER 31,             OCTOBER 31,
                                                       ----------------------------------  ----------------------
<S>                                                    <C>         <C>         <C>         <C>         <C>
                                                          1994        1995        1996        1996        1997
                                                       ----------  ----------  ----------  ----------  ----------
 
<CAPTION>
                                                                         (DOLLARS IN THOUSANDS)
<S>                                                    <C>         <C>         <C>         <C>         <C>
Copper...............................................  $  129,007  $  186,905  $  148,426  $  155,641  $  148,898
Silver...............................................      97,311     100,853     110,967     114,544      98,006
Zinc.................................................      62,507      72,599      73,753      74,855      83,521
Lead.................................................      45,259      58,999      76,353      74,648      65,385
Gold Bullion.........................................      21,383      19,619      20,361      21,084      14,605
By-Products..........................................      11,590      11,954      26,937      19,869      21,469
                                                       ----------  ----------  ----------  ----------  ----------
      Total..........................................  $  367,057  $  450,929  $  456,797  $  460,641  $  431,884
                                                       ----------  ----------  ----------  ----------  ----------
                                                       ----------  ----------  ----------  ----------  ----------
</TABLE>
 
    COPPER
 
    Doe Run Peru produces refined copper cathodes with a purity level of
99.975%. Copper sales accounted for $148.9 million of Doe Run Peru's net sales
for the twelve months ended October 31, 1997. Peru represented the largest
market for Doe Run Peru's copper shipments in 1997, which accounted for 30% of
total shipments, followed by the United States and Hong Kong which represented
27% and 16% of total shipments, respectively. In 1997, approximately 38% of the
copper cathode production was further processed at Doe Run Peru's adjacent
fabricating facility for the production of copper wirebars and wirerods. The
largest market for refined copper, accounting for over 50% of western world
copper consumption, is wirerod, which is used almost exclusively in the
production of insulated wire and cable. Other important markets for refined
copper include copper sheet and strip and tube used in the construction and
transportation industries.
 
    As part of Doe Run Peru's Capital Investment Program, investments are
planned through fiscal 1999 which will improve the cathode quality from standard
grade to LME Grade A. In addition, such program will increase the capacity of
the copper refinery to match copper anode output from the smelter. Doe Run Peru
currently produces standard copper.
 
    SILVER
 
    Refined silver produced by Doe Run Peru is good delivery 99.996% pure as
registered by the LBMA and COMEX. Silver sales accounted for $98.0 million of
net sales for the twelve months ended October 31, 1997. Doe Run Peru also
produces small amounts of sterling silver directed to the domestic jewelry
market. The United States, accounting for 38% of total shipments, represented
the largest market for Doe Run Peru's silver, followed by Brazil and Great
Britain at 23% and 16% of total shipments, respectively. The photographic film
industry accounts for one-third of western world silver demand, and jewelry and
silverware also account for one-third. Other important uses for silver include
electronics and silver-minted coins.
 
    ZINC
 
    Doe Run Peru produces LME-registered refined zinc with a purity level of
99.996%. Zinc sales accounted for $83.5 million of Doe Run Peru's net sales for
the twelve months ended October 31, 1997. During 1997, Peru represented the
largest single market for Doe Run Peru's zinc output, accounting for 31% of
total shipments, as a result of strong local demand from export-oriented
industries with applications for steel coatings, specialized alloys and dry
battery plates. The United States represented 25% of total shipments that were
primarily exported to manufacturers of coatings, paints and protectants, casters
of auto parts and toy manufacturers.
 
                                       84
<PAGE>
    LEAD
 
    Doe Run Peru produces LME-registered 99.997% pure refined lead ingots and
blocks. Lead sales accounted for $65.4 million of net sales for the twelve
months ended October 31, 1997. Doe Run Peru also provides antimonial lead alloys
to meet the specialty demands of certain customers. The three largest markets
for Doe Run Peru's lead production in 1997 were Taiwan, accounting for 14% of
total shipments, followed by Brazil and Korea which each represented 10% of
total shipments. The largest market for refined lead remains lead-acid batteries
used in automobiles, forklifts, golf carts, marine applications and stationary
applications for backup power sources. Other markets for refined lead include
lead compounds used in the manufacture of computer and television screens and
rolled and extruded lead products for radiation shielding and roofing materials.
 
    With the additional lead production from the operations of Doe Run Peru, Doe
Run is the second largest primary lead producer in the western world. Doe Run
Peru and Doe Run intend to work together to take advantage of opportunities to
optimize lead marketing efforts.
 
    GOLD BULLION
 
    Doe Run Peru produces 99.8% pure gold bullion bars exported primarily to
Europe and the United States. Gold bullion sales accounted for $14.6 million of
net sales for the twelve months ended October 31, 1997. During 1997, the United
States represented 44% of total shipments, followed by Germany and Peru,
accounting for 40% and 16% of total shipments, respectively.
 
    BY-PRODUCTS
 
    Principal by-products produced by Doe Run Peru include bismuth, indium,
tellurium, antimony and cadmium. Sales of these by-products totaled $21.5
million for the twelve months ended October 31, 1997. Bismuth, the largest
by-product revenue generator, is exported primarily to Europe. Bismuth has a
wide variety of uses including pharmaceutical compounds, chemicals, low melting
alloys and pigments. Pharmaceutical uses include the treatment of stomach ulcers
and over-the-counter products.
 
    Indium is consumed primarily in the flat-panel display industry, as well as
in aerospace products, architectural glass, solar energy and lighting
applications. Indium is a difficult metal to extract because of its considerable
chemical affinity to other elements. Japan is estimated to account for more than
50% of the world indium market for use in the thin-film industry.
 
    Tellurium is used to improve the machining quality of copper and stainless
steel products and to color glass and ceramics. Other industrial uses include
thermoelectric devices, rubber compounds and blasting caps.
 
    Antimony is used with lead in alloys for battery production in flame
retardants, fabrics, plastics and ammunition. Cadmium is used primarily for
battery production, as well as in pigments, coating and plating of iron, plastic
and synthetic products and alloys.
 
  MARKETING AND SALES
 
    Doe Run Peru's marketing and sales strategy is to maximize the net realized
selling prices for all its products. In addition, Doe Run Peru is shifting the
focus of its marketing efforts to end users of its products from international
trading companies. In furtherance of this strategy, Doe Run Peru plans to
provide customers flexible quantities and deliveries, additional metal alloy
choices and technical assistance.
 
    Doe Run Peru generally exports metal on a delivered basis with freight
charges included. In many of the foreign markets, sales agents are utilized to
ensure smooth delivery and to help further develop the local market. Doe Run
Peru's location in the central Andes of Peru and its proximity to the Callao
port position it favorably for shipment to major world markets and to the
emerging Latin American market.
 
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Metal sales within Peru are sold both on a delivered and "free on board" basis
from facilities in Callao. Doe Run Peru plans to market additional metal into
the Latin American market in order to take advantage of lower freight costs and
strong metal premiums.
 
    Doe Run currently is actively involved in several industry associations
promoting and developing lead consumption. Through Doe Run Peru, Doe Run plans
to gain membership and or to continue membership in other metal industry
associations.
 
  CAPITAL INVESTMENT PROGRAM
 
    Doe Run Peru will undertake over a ten-year period the Capital Investment
Program of approximately $300.0 million to enhance various elements of Doe Run
Peru's operations. The objective of the Capital Investment Program is to
increase net sales and EBITDA by improving product quality, increasing
production capacity and reducing unit costs. In addition, through the
environmental expenditures described below, Doe Run Peru will endeavor to
achieve compliance with environmental regulations in Peru. See "--Environmental
Matters."
 
    Management believes that cash flow from operations in addition to
availability under the New Doe Run Peru Revolving Credit Facility will be
sufficient to fund the Capital Investment Program. See "Management's Discussion
and Analysis of Financial Condition and Results of Operations." The following
summarizes the Capital Investment Program including expenditures planned for
each metal circuit.
 
    COPPER CIRCUIT
 
    Doe Run Peru has identified the copper circuit as the most important of the
strategic initiatives to improve its operations, requiring total expenditures,
including sustaining capital requirements, of approximately $60.0 million
through fiscal 2007. Current projects are designed to increase capacity and
reduce energy costs through oxygen injection into the furnaces. These projects
will be supplemented in the near term with investments to replace production of
copper blister with higher quality fire-refined copper anodes prior to the
electrolytic refining process. With the introduction of anode casting, Doe Run
Peru anticipates that the refined copper produced will meet the LME-registered
quality standards (commonly known as Grade A) as opposed to the standard grade
presently produced. As of March 31, 1998, the price for Grade A copper was $.79
per pound, with the price for standard grade copper at a discount to the Grade A
price. Doe Run Peru also believes that, as a result of these projects, refined
copper production capacity will increase from approximately 73,000 tons to
88,000 tons per year by the year 2000, thereby more closely matching refinery
capacity with smelter output. The production of Grade A copper will allow Doe
Run Peru to sell to a wider range of customers. Moreover, since the prices
realized for Grade A copper are greater than those realized for standard grade
copper, Doe Run Peru will be able to realize greater net sales.
 
    LEAD CIRCUIT
 
    Utilizing Doe Run's extensive experience in lead operations, Doe Run Peru
has identified several opportunities to introduce Doe Run operating procedures
to increase production capacity and reduce costs. Specific projects include
improving oxygen availability to the sinter plant and blast furnaces, enlarging
one blast furnace and refurbishing the refinery cell blocks. The combination of
these capital projects are expected to increase lead production capacity from
approximately 110,000 tons to 127,000 tons per year by the year 2000. Doe Run
Peru anticipates that the cost of the lead circuit improvements, including
sustaining capital requirements, will be approximately $20.0 million through
fiscal 2007.
 
    ZINC CIRCUIT
 
    Doe Run Peru anticipates investing approximately $18.0 million, including
sustaining capital requirements, in the zinc circuit through fiscal 2007,
primarily to improve metallurgical recoveries and to retrofit
 
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an existing sulfuric acid plant. The installation of an additional purification
stage prior to electrowinning will improve the removal of copper, cadmium,
cobalt and other impurities, thereby increasing overall zinc recoveries,
allowing greater feed flexibility and reducing concentrate purchases and unit
operating costs. Presently, Doe Run Peru's zinc production capacity is
approximately 77,000 tons which will remain relatively stable in the forseeable
future.
 
    ENVIRONMENTAL IMPROVEMENTS
 
    As part of the Acquisition, Doe Run Peru entered certain agreements with the
MEM. Under these agreements, Doe Run Peru is required to make the Investment
Commitment that includes expenditures to comply with environmental regulations
in Peru, including those governing the treatment, handling and disposal of solid
wastes, liquid effluent discharges and gaseous emissions. Principal projects
related to environmental matters include building sulfuric acid plants for the
metal circuits, new converter and roaster technology for the copper circuit,
replacement of the roaster equipment for the zinc circuit, water and sewage
treatment facilities, and slag and slimes handling equipment and disposal
facilities. Doe Run Peru estimates that expenditures related to environmental
matters will be approximately $195.0 million through fiscal 2007. See
"--Environmental Matters."
 
    OTHER
 
    Doe Run Peru will invest approximately $7.0 million over the ten-year period
for various other projects, including phone and computer system upgrades,
expenditures related to employee health and safety, and other miscellaneous
capital expenditures.
 
  CUSTOMERS
 
    Doe Run Peru had approximately 421 customers in 1997, of which the five
largest accounted for approximately 28% of its net sales. Doe Run Peru's
customers include a wide variety of industrial and international trading
companies with the two largest, Engelhard Corporation and Tecnofil S.A.,
accounting for approximately 9.8% and 5.1%, respectively, of Doe Run Peru's 1997
net sales. Approximately 78% of total shipments and approximately 79% of net
sales were exported outside of Peru, with Latin American countries representing
the largest destination in 1997 with approximately 47% of net sales, followed by
North America, Asia and Europe with 26%, 18% and 9% of net sales, respectively.
Approximately 80% in 1997 of Doe Run Peru's metal sales were pursuant to
contractual agreements, typically one year or less. Such contracts generally set
forth minimum volumes and pricing mechanisms. Due Run Peru conducts
substantially all of its business with its customers in U.S. dollars.
 
  COMPETITION
 
    Doe Run Peru is among the largest metal processing companies in the world
with the unique combination of base metal smelters, refineries and by-product
circuits capable of processing complex concentrates into base and precious
metals and various by-products to international quality standards. Only three
other facilities in the western world, Union Miniere S.A.'s facility in Hoboken,
Belgium, Boliden Limited's facility in Ronnskar, Sweden and The Goldfield
Corporation's facility in Tsumeb, Namibia, have the capability to treat lead and
copper concentrates containing high antimony, arsenic, bismuth and precious
metal values in addition to a variety of residues. Unlike Doe Run Peru, none of
the facilities listed above have a dedicated zinc production circuit. Given Doe
Run Peru's access to complex concentrates in Peru and neighboring Latin American
countries, Doe Run Peru believes it operates at a geographic competitive
advantage to comparable facilities located farther from their sources of complex
concentrates.
 
    Although there are other facilities throughout the world that process
complex concentrates, those operations do not have Doe Run Peru's capability to
process complex concentrates which contain high
 
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levels of impurities, such as bismuth, arsenic and cadmium. Such facilities
include Industrias Penoles S.A.'s facility in Torreon, Mexico and Dowa Mining
Co. Ltd.'s facility in Kosaka, Japan.
 
  RAW MATERIALS
 
    Doe Run Peru's primary raw material is concentrate feedstock. In addition to
concentrate feedstock, Doe Run Peru utilizes various raw materials, principally
water, electricity, oxygen, coal and fluxes.
 
    CONCENTRATE FEEDSTOCK
 
    Doe Run Peru is located in the central Andes of Peru, which is among the
most productive mining regions in the world. Peruvian concentrates typically
contain high levels of precious metals in addition to impurities such as
arsenic, antimony, bismuth and others, that increase the complexity of the
metallurgical processes required to separate impurities from base and precious
metals. Doe Run Peru's operations were designed and customized since its
construction in 1922 to handle the characteristics of raw materials available in
the region.
 
    COPPER.  During 1997, approximately 84% of the copper concentrates processed
at Doe Run Peru were supplied from the Peruvian domestic market, with
Centromin's mines accounting for a substantial portion of the total feedstock.
Contained copper production by Peruvian mines totaled approximately 529,000 tons
in 1996 and increased to approximately 579,000 tons in 1997. The complexity of
some concentrates from the domestic market result in favorable concentrate
pricing terms for Doe Run Peru and increased revenues from the recovery and
commercialization of by-products. In addition, due to its location close to the
mines of Peru, the smelter is able to save substantially on concentrate freight
charges. These savings typically are shared between Doe Run Peru and the
concentrate suppliers. Doe Run Peru obtains the balance of its copper
concentrate requirements from neighboring Latin American countries. Such
concentrates share similar metallurgical characteristics as Peruvian
concentrates. Imported concentrates reflect international market terms and are
purchased to produce the appropriate concentrate blend for the smelter.
 
    ZINC.  During 1997, all of the zinc concentrates processed at Doe Run Peru
were supplied from the Peruvian domestic market, with Centromin's mines
accounting for approximately 94% of the total feedstock. The disadvantage of
consuming concentrates from certain of the Centromin mines is the high level of
contained iron. Zinc ferrites form in the leaching phase in an amount
proportional to the iron content in the feedstock. These ferrites capture
approximately 10% to 13% of the zinc contained in the concentrate feedstock and
effectively reduce the metallurgical recovery of the circuit. As a private
enterprise, Doe Run Peru will not face any limitations with respect to sources
of concentrate and, thus, will have an opportunity to obtain concentrates with
reduced iron content.
 
    Zinc metal contained in concentrates produced by Peruvian mines was
approximately 804,000 tons in 1996 and increased substantially to approximately
961,000 tons in 1997. Doe Run Peru requires approximately 70,000 tons of zinc
metal contained in concentrates per year to maximize production capacity. With
present mine production, Doe Run Peru believes that sufficient concentrates will
be available to meet its requirements for the foreseeable future.
 
    LEAD.  During 1997, approximately 99% of the lead concentrates processed at
Doe Run Peru were supplied from the Peruvian domestic market, with Centromin's
mines accounting for approximately half of the total feedstock. Contained lead
metal production by Peruvian mines totaled approximately 273,000 tons in 1996
and increased to approximately 287,000 tons in 1997. Since Doe Run Peru has no
local Peruvian competitor in lead smelting, all of the concentrates, the total
of which far exceeds Doe Run Peru's requirements, are available to Doe Run Peru.
 
    A majority of the lead concentrates purchased by Doe Run Peru contain
certain impurity levels that result in lower concentrate prices due to penalties
imposed on such concentrates. In addition, such
 
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concentrates increase revenues for Doe Run Peru due to the recovery and
marketing of silver and by-products.
 
    WATER
 
    Water is utilized throughout Doe Run Peru's operations, particularly for:
(i) slag granulation in copper and lead processes; (ii) cooling systems of the
sulfuric acid plant, lead blast furnaces, compressors and rectifiers; (iii)
steam generation; and (iv) hydrometallurgical and electrometallurgical
processes. Water for the Doe Run Peru facility is obtained from three main
sources: the Mantaro River; the Tishgo River; and the Cuchimachay Spring. Doe
Run Peru believes these three sources, in addition to numerous adjacent springs
and wells, provide adequate water supply for the facility.
 
    ELECTRICITY
 
    The Doe Run Peru facility receives electric power from Centromin's
Electroandes hydroelectric division and consumes approximately 63 megawatts
ongoing load, which represents approximately one-third of the division's
capacity. Doe Run Peru recently signed a ten-year power supply contract with
Centromin and Electroandes. Doe Run Peru believes that the contract provides
sufficient power to Doe Run Peru over the life of the contract at satisfactory
long-term rates. Such rates, however, are above what Doe Run Peru's Predecessor
historically paid.
 
    OTHER
 
    Doe Run Peru installed an oxygen plant in 1994 that, with a capacity of 353
tons per day. The oxygen plant supplies oxygen for the oxy-fuel burners of the
reverberatory furnace of the copper smelter and for the blast furnaces of the
lead smelter. Coal is imported from Colombia to produce metallurgic coke for the
lead circuit blast furnaces. Fluxes consumed in the smelting process are
supplied from Doe Run Peru's limestone and silica deposits adjacent to the
facility. Both coal and fluxes are transported to the smelter by rail.
 
  PRODUCTION PROCESS
 
    Doe Run Peru utilizes conventional pyrometallurgical processes for smelting
or roasting concentrates followed by hydrometallurgical refining processes.
Summarized below is a description of the production process for copper, silver
and gold, zinc and lead.
 
    COPPER CIRCUIT
 
    The copper circuit consists of the smelter, responsible for processing
copper concentrates into a 98.6% pure copper blister, and the refinery,
responsible for upgrading copper blister into 99.975% pure refined copper metal.
Current estimated annual capacity at the refinery is 73,000 tons. Production of
refined copper reached approximately 71,000 tons for 1997. Doe Run Peru's
overall metallurgical recovery of copper is approximately 96.5%.
 
    Copper concentrates are mixed with fluxes and inter-plant transfers in the
preparation plant prior to entering the roasting section. The roasters produce a
calcine from the copper concentrates that is transported to the oxygen-fuel
reverberatory furnace. The reverberatory furnace produces two products: a heavy
matte containing the recoverable metals and a slag waste-product that is
granulated in water and transported to a slag disposal area. The hot matte is
then ladled to the converter section where a two step process converts the matte
into 98.6% copper blister that is directly cast into 584 pound blister anodes.
 
    The copper refinery is located three kilometers west of the smelter where
blister anodes are received from the smelter by rail. The refinery utilizes an
electrolytic process whereby the copper in the blister anode is transferred to a
cathode starting sheet. As the copper anode dissolves, gold, silver, and other
 
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impurities are deposited at the bottom of the cells as an insoluble slime that
is collected at the end of the anode cycle. Copper cathodes, which are 99.975%
refined copper metal, are collected from the tankhouse every seven days.
 
    ZINC CIRCUIT
 
    The zinc circuit employs conventional roasting, leaching and electrowinning
technologies. During 1997, the circuit produced approximately 75,000 tons of
refined zinc. Current estimated capacity of the zinc refinery is approximately
77,200 tons of refined zinc with an overall metallurgical recovery of 88%. The
roasting plant produces a calcine that is processed continuously in a
hydrometallurgical leaching and purification section that dissolves the zinc
oxides and sulfates contained in the calcine. The zinc sulfate solution is
separated from solid residues by thickening and filtering processes. After
purification, the solution is pumped to the electrowinning section. The zinc
refinery is adjacent to the roaster and utilizes an electrolytic process whereby
zinc from the sulfate solution is transferred to a cathode starting sheet. Solid
residues from the leaching process are processed in a flotation plant to produce
a zinc-silver concentrate sold to international markets. Certain remaining
unprocessed zinc ferrites are sent to a disposal pond. Zinc cathodes, which are
99.996% refined zinc metal, are collected from the tankhouse every sixteen
hours.
 
    LEAD CIRCUIT
 
    The lead circuit consists of the smelter, responsible for processing lead
concentrates into 96% pure lead bullion, and the refinery, responsible for
upgrading lead bullion into 99.997% pure refined lead metal. Current estimated
annual capacity of the lead refinery is approximately 110,000 tons of lead
metal. Production of refined lead metal reached approximately 108,000 tons for
1997. Doe Run Peru's overall metallurgical recovery of lead is approximately
95%.
 
    Lead concentrates are mixed with inter-plant transfers and other lead
bearing materials in the preparation plant prior to entering the sinter plant.
The sinter plant utilizes an up-draft sinter machine that removes a majority of
the sulfur from the feedstock. Following sintering, the processed material is
blended with coke and fed to the blast furnace to produce two products: a heavy
bullion containing the recoverable metals and a slag waste-product that is
granulated in water and transported to a slag disposal area. The hot bullion is
then transferred to the dross plant for further processing prior to casting into
lead bullion anodes.
 
    The lead refinery is located three kilometers west of the smelter where
bullion anodes are received from the smelter by rail. The refinery utilizes an
electrolytic process whereby the lead in the blister anode is transferred to a
cathode starting sheet. As the lead anode dissolves, gold, silver, and other
impurities are deposited at the bottom of the cells as an insoluble slime that
is collected at the end of the anode cycle. Lead cathodes, which are 99.995%
refined lead metal, are collected from the tankhouse every four days.
 
    ANODE BY-PRODUCTS CIRCUIT AND SILVER REFINING
 
    The anode residue plant treats insoluble slimes remaining from the copper
and lead refining processes. The plant processes these slimes to recover
bismuth, selenium, tellurium and a metal ore that is further upgraded in the
silver refinery. The estimated capacity of the silver refinery is approximately
32.2 million ounces per year of refined silver and approximately 76,000 ounces
of gold bullion. During 1997, the silver refinery produced approximately 22.4
million ounces of silver and approximately 44,000 ounces of gold bullion. In
fiscal 1999, the capacity of the silver refinery is expected to increase to
approximately 37.0 million ounces per year.
 
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<PAGE>
  FACILITIES
 
    Doe Run Peru's operations are located in the town of La Oroya, located
approximately 110 miles from the Peruvian capital of Lima, approximately 75
miles from the Cerro de Pasco mine and approximately 78 miles from the city of
Huancayo, at an altitude of approximately 2.3 miles above sea level. The complex
is linked to these locations by highway and railroad service. The principal
operations reside in two areas within La Oroya. The copper smelter, lead smelter
and zinc refinery, in addition to the antimony plant, arsenic plant, coke plant,
cadmium plant and maintenance shops are located on the southern bank of the
Mantaro River directly behind the central offices (the "Smelter Location"). The
copper refinery, lead refinery, copper fabricating plant and several storage
yards are located three kilometers west of the smelter facilities at Huaymanta
(the "Refinery Location").
 
    The following table sets forth the total land area and facility size of Doe
Run Peru's facilities:
<TABLE>
<CAPTION>
                                                                                  SIZE
                                                                        -------------------------
<S>                                                                     <C>          <C>
FACILITY                                                                   LAND        FACILITY
- ----------------------------------------------------------------------  -----------  ------------
 
<CAPTION>
                                                                                       (SQUARE
                                                                          (ACRES)       FEET)
<S>                                                                     <C>          <C>
Copper Smelter........................................................         3.5       302,000
Lead Smelter..........................................................         3.1       262,000
Copper and Lead Refinery..............................................         6.9       311,000
Zinc Refinery.........................................................         4.3       258,000
Solid Disposal Area...................................................       110.3        --
Other Areas...........................................................        11.4       554,000
</TABLE>
 
    Operations at the Smelter Location began in 1922 under the Cerro de Pasco
Copper Corporation, and the Smelter Location continues to utilize many of the
original structures. Additions to the Smelter Location include a new lead sinter
plant installed in 1983 and the oxygen plant completed in 1994. Operations at
the Refinery Location also began in 1922, and many of the existing structures
remain in use. Other major additions to the Refinery Area include the wirerod
plant constructed in 1966 and additional refinery cell blocks added in the
mid-1970s.
 
  SAFETY
 
    Doe Run Peru's safety performance has improved significantly since 1990, and
with further assistance and direction provided by Doe Run, Doe Run Peru will
continue to maintain a high regard for safety and hygiene. Recently, Peru's
Ministerio de Trabajo y Promocion Social (the Industrial Safety Department) has
been enforcing measures to minimize any work-related illnesses or accidents
through continuous inspections to ensure compliance with numerous safety
standards.
 
  EMPLOYEES
 
    As of April 30, 1998, Doe Run Peru employed 861 active salaried employees
and 2,054 active hourly employees. In addition, Doe Run Peru employed 984 people
on a contract basis for production work-orders, maintenance and other tasks.
 
    There are two unions for hourly employees and two unions for salaried
employees. The principal union representing 90.4% of the hourly employees is the
Sindicato de Trabajadores Metalurgicos La Oroya (La Oroya Metallurgic Workers
Union). The Sindicato de Trabajadores Ferroviarios La Oroya (La Oroya Railway
Workers Union) represents 3.8% of the hourly workers, and the remainder of the
hourly workers (5.8%) are not affiliated with either union. On July 26, 1998,
Doe Run Peru entered into five-year labor agreements, effective through July 25,
2003.
 
    The salaried employees are represented by the Sindicato de Empleados
Yauli-La Oroya (Yauli-La Oroya Employees Union), representing 64.9% of the
salaried employees and by the Sindicato de Empleados Ferroviarios La Oroya (La
Oroya Railway Employees Union), representing 9.0% of salaried
 
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employees. The remainder of salaried employees, 26.1%, are not affiliated with
either union. The current salaried employees' labor agreement continues until
December 31, 2002. Management believes that Doe Run Peru's labor relations have
been good as evidenced by three consecutive years of labor harmony without
strikes and likewise three consecutive years of solution without conflict of the
labor agreements with workers and employees.
 
  BENEFIT PLANS
 
    The benefit plan for Doe Run Peru is centered around a severance payment, a
social benefit directed by the Compensacion por Tiempo de Servicios, a Peruvian
labor legislative decree. This benefit includes a money reserve established by
the employer and deposited in a banking entity for the benefit of the worker
when the employment relationship ends. Deposits are made twice a year and equal
one month's salary. Other benefits include a social security system operated by
the Peruvian government which provides benefits for both health and pensions. In
addition to social security, Doe Run Peru maintains a private system of private
pension, the cost of which is paid by the employee through paycheck deductions.
 
  ENVIRONMENTAL MATTERS
 
    LEGAL FRAMEWORK
 
    Modern environmental legislation has been introduced only in the last decade
in Peru. For mining and metallurgical activities, the MEM is the principal
regulatory authority. The MEM has issued "maximum permissible limits" for liquid
effluent, air emissions and ambient air quality. In addition, the Consejo
Nacional del Ambiente (National Environmental Council) coordinates government
regulations and policies. The Direccion General de Salud Ambiental (Directorate
General of Environmental Health) (the "DIGESA"), a division of the Ministerio de
Salud (Ministry of Health), issues waste water discharge permits based on
standards governing receiving water quality. Peruvian law requires all new
mining or metallurgical operations, and existing operations that are undergoing
an expansion of over 50% of installed capacity, to submit to the MEM an Estudio
de Impacto Ambiental (Environmental Impact Study).
 
    As to mining and metallurgical operations in existence prior to 1994,
concession holders (i.e. owner/ operators) were required to submit to the MEM an
Evaluacion Ambiental Preliminar (Preliminary Environmental Assessment) (the
"EVAP") that identified environmental impacts and twelve months of baseline
monitoring. Based on the results of the EVAP, the operator was to submit to the
MEM a PAMA that consisted of an environmental impact analysis, monitoring plan,
and data, mitigation measures and closure plan. The PAMA also sets forth the
actions and corresponding annual investments the concession holder agrees to
undertake in order to achieve compliance with the maximum applicable limits
prior to expiration of the PAMA (ten years for smelters, such as Doe Run Peru's
operations, and five years for any other type of mining or metallurgical
operation). The required amount of annual investment must not be less than one
percent of annual sales. Once approved, the PAMA functions as the equivalent of
an operating permit with which the operator must comply. After expiration of the
PAMA, the operator must comply with all applicable standards and requirements.
Mining, metallurgical and processing operators must present annual sworn
statements to the MEM that describe their operations and resultant emissions. In
addition, Peruvian environmental law allows operators to enter into a Contrato
de Estabilidad Administrativa Ambiental (Contract for Administrative
Environmental Stabilization) ("Environmental Stabilization Agreement") in order
to provide some potential limit to the applicability of new laws during the life
of the PAMA.
 
    PAMA AND ENVIRONMENTAL STABILIZATION AGREEMENT
 
    The initial PAMA for Doe Run Peru's Predecessor was submitted by Centromin
and approved by the MEM on January 13, 1996. The PAMA was modified in connection
with the Acquisition to reflect a
 
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reallocation of environmental responsibilities between Centromin and Doe Run
Peru, and corresponding revisions were made to the investment schedule. The MEM
approved separate PAMAs for Centromin and Doe Run Peru and an Environmental
Stabilization Agreement for Doe Run Peru. Centromin has committed under its PAMA
to implement the following projects over the next nine years, estimated to cost
approximately $24 million: (i) remediation of areas impacted by emissions during
its period of operations; (ii) closure of the lead and copper slag deposits (at
Huanchan); (iii) improved management of the Huanchan deposit (E.G. storm water
diversion and slope stability); and (iv) closure of the arsenic trioxide
deposits (at Malpaso and Vado).
 
    Doe Run Peru has committed under its PAMA to implement the following
projects over the next nine years, estimated in the PAMA to cost approximately
$107.5 million: (i) new sulfuric acid plants; (ii) elimination of fugitive gases
from the coke plant; (iii) use of oxygenated gases in the anodic residue plant;
(iv) water treatment plant for the copper refinery; (v) a recirculation system
for cooling waters at the smelter; (vi) management and disposal of acidic
solutions at the silver refinery; (vii) industrial waste water treatment plant
for the smelter and refinery; (viii) containment dam for the lead muds near the
zileret plant; (ix) granulation process water at the lead smelter; (x) anode
washing system at the zinc refinery; (xi) management and disposal of lead and
copper slag wastes; and (xii) domestic waste water treatment and domestic waste
disposal. The actual current estimate for the environmental projects and related
process changes for Doe Run Peru is $195.0 million.
 
    Doe Run Peru's operations historically and currently exceed some of the
applicable MEM maximum permissible limits pertaining to air emissions, ambient
air quality and waste water effluent quality. The PAMA projects, which are more
fully discussed below, have been designed to achieve compliance with such
requirements prior to the expiration of the PAMA on January 13, 2007. No
assurance can be given that implementation of the PAMA projects is feasible or
that their implementation will achieve compliance with the applicable legal
requirements by the end of the PAMA period. Doe Run Peru has advised the MEM
that it intends to seek changes in certain PAMA projects that it believes will
more effectively achieve compliance. However, there can be no assurance that the
MEM will approve proposed changes to the PAMA or that implementation of the
changes will not increase the cost of compliance. Further, there can be no
assurance that the Peruvian government will not in the future require compliance
with additional environmental obligations that could adversely affect Doe Run
Peru's business, financial condition or results of operations. Under the
Subscription Agreement, Centromin agreed to indemnify Metaloroya against
environmental liability arising out of its prior operations, and performance of
the indemnity has been guaranteed by the Peruvian government through the
enactment of the Supreme Decree No. 042-97-PCM. However, there can be no
assurance that Centromin will satisfy its environmental obligations and
investment requirements, including those in its PAMA, or that the guarantee will
be honored. Any failure by Centromin to satisfy its environmental obligations
could adversely affect Doe Run Peru's business, financial condition or results
of operations.
 
    ENVIRONMENTAL CONSIDERATIONS
 
    GASEOUS EMISSIONS.  Doe Run Peru is required to control gaseous emission to
meet ambient air quality standards and the applicable emissions rate by January
2007. In 1997, sulfur dioxide emissions from the smelter complex amounted to
approximately 990 tons per day. The MEM has established a maximum sulfur dioxide
rate for Doe Run Peru of 17% of incoming sulfur based on current production
levels.
 
    Dust emissions currently total approximately 9.8 tons per day, consisting of
approximately 2.5 tons of lead, 2.0 tons of arsenic, 0.3 tons of zinc and
smaller quantities of other metals. Although the main stack is the largest
source of gaseous emissions, significant quantities of the same effluents are
issued from the numerous smaller stacks, as well as from many non-stack sources.
 
    LIQUID EFFLUENTS.  Doe Run Peru is required to control liquid effluents to
meet the MEM's discharge limits and DIGESA's water quality standards. Forty
individual discharge sources were identified by the
 
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monitoring program of the EVAP as releases from Doe Run Peru to the Yauli and
Mantaro Rivers. Liquid effluents contain metals in solution and solids in
suspension. Five liquid effluent discharges account for 90% of the total
discharge volume from the smelter and refinery facilities. The highest
volumetric discharge of the total includes a combination of effluents from the
copper-lead slag granulation process and cooling water from the powerhouse.
 
    SOLID RESIDUES.  The principal solid residues generated by Doe Run Peru's
facility are shown below:
 
<TABLE>
<CAPTION>
RESIDUE                                                                       ESTIMATED VOLUME
- ----------------------------------------------------------------------------  -----------------
<S>                                                                           <C>
                                                                              (TONS PER MONTH)
Copper Slag.................................................................         22,000
Lead Slag...................................................................         14,000
Zinc Ferrites...............................................................          2,400
Arsenic Trioxide............................................................            280
</TABLE>
 
    Granulated copper and lead slag is transported across the Mantaro River by
aerial tram and stockpiled at Huanchan. Zinc leaching residue, consisting mainly
of zinc ferrites, is pumped into ponds in the same area. Arsenic trioxide is
transported by rail to the Vado site, where it is stored under water spray for
dust suppression.
 
<TABLE>
<CAPTION>
                                                                   DISTANCE FROM
DEPOSIT                                                            DOE RUN PERU     ESTIMATED SIZE
- ---------------------------------------------------------------  -----------------  --------------
<S>                                                              <C>                <C>
                                                                      (MILES)           (TONS)
Huanchan copper and lead slag..................................            2.5         11,000,000
Zinc Ferrites..................................................            1.2          1,400,000
Vado arsenic trioxide slag.....................................            5.6            180,000
Malpaso arsenic trioxide slag (historical).....................            8.7            Unknown
</TABLE>
 
    OVERVIEW OF THE ENVIRONMENTAL PROJECTS
 
    In accordance with the PAMA, Doe Run Peru has included in its capital
expenditure plans specific capital projects to accomplish the goals of the PAMA.
Excluding the process-related projects which assist in meeting the environmental
requirements, Doe Run Peru's major environmental projects include slag handling,
industrial wastewater treatment, sulfur dioxide capture and recovery as sulfuric
acid, and sewage and garbage management. The total costs of these projects and
associated process changes and other environmental control projects are expected
to approach $195.0 million over the next nine years starting in 1998.
 
    SLAG HANDLING AND DISPOSAL.  A new mechanical slag handling system will be
installed for the 1,100 tons of copper and lead slag per day to either dewater
granulated slag and deliver it to the ultimate disposal site or to deliver the
hot slag to its ultimate disposal site. The objective of the project is to
replace the undersized tramway slag system, which currently loses 30% to 40% of
the slag into the Mantaro River, with a system capable of safely delivering all
slag to its final disposition site and to minimize any discharge of heavy metals
into the river.
 
    A number of mechanical systems will be evaluated both for continuing
granulation and for delivering the material hot. A Trommel dewatering system was
outlined in the PAMA. Installation of the dewatering system, when selected, is
expected to occur in fiscal 1999. The capital cost for the project is estimated
to be $6.0 million. If a new slag site is developed, approximately $3.0 to $5.0
million is expected to be expended in preparing the site.
 
                                       94
<PAGE>
    ZINC FERRITE DISPOSAL
 
    Doe Run Peru has the option to continue to use the existing disposal site
for three years and then either take ownership of it or develop a new site and
pay Centromin $7.2 million for closure costs. It is probable that Doe Run Peru
will retain ownership of the disposal site and develop a new disposal site on
property currently owned for that purpose. The cost of developing this site is
expected to be approximately $3.0 to 5.0 million.
 
    INDUSTRIAL WASTEWATER TREATMENT.  Recycling projects will be implemented to
recirculate and reuse wastewater after cooling or intermediate treatment. The
water recycling project for slag handling will reduce the 20,000 gallons per
minute rate to approximately 3,000 gallons per minute for discharge. An
industrial sewer network will be constructed to drain effluent from
approximately 35 outfalls to several pumping stations, which, after solids
removal, will be treated and discharged to the river. The purpose of this
project is to eliminate the untreated discharge of metal bearing wastes into the
Mantaro River. This system is different from and more costly than the project
set forth in the PAMA. The system will be designed to meet the MEM's discharge
limits and DIGESA's water quality standards. However, there can be no assurance
that the MEM will approve this project, or that DIGESA will not require
additional actions at increased cost.
 
    The recycling and pre-treatment steps are expected to be installed in fiscal
1999. The collection systems and sedimentation tanks are expected to be
installed in fiscal 2000, and the first stage treatment plant is expected to be
installed in fiscal 2001. If a second stage treatment is required, it will be
deferred for three to four years. The estimated cost of the project is $25.0
million which reflects local labor rates and the deferral of the second stage
treatment, which may not prove to be necessary. Addition of the second stage
could cost approximately $2.0 million.
 
    SULFUR DIOXIDE CAPTURE AND LEAD EMISSION REDUCTION.  The PAMA provides for
process gas from the copper, zinc and lead process circuits to be treated in two
sulfuric acids plants for the conversion of sulfur dioxide to sulfur trioxide
and the recovery as sulfuric acid, a by-product that Doe Run Peru expects to
sell. The objective of this project is to increase the capture of sulfur dioxide
from approximately 11% to a minimum of 83%, which is the MEM standard. The
second objective is to reduce the sulfur dioxide and metal emissions in the
ambient air surrounding the plant to within MEM standards. The acid plants will
be installed in fiscal 2005 and 2006. The estimated costs of each of the two
plants is approximately $39.0 million.
 
    The PAMA also provides for replacement of the existing lead circuit with a
new technology to assist in insuring at least 83% capture. However, Doe Run Peru
does not believe that this process has been adequately demonstrated and likely
will seek a change to the PAMA to avoid this process change. Other options are
available if needed to meet the sulfur dioxide emission limit, which are
estimated to cost in the range of $50.0 to $80.0 million.
 
    Given the complex terrain and valley configuration of the Doe Run Peru
facility, there can be no assurance that the measures contemplated in the PAMA
will achieve compliance with the ambient air quality standard for sulfur dioxide
or for lead, particularly during inversion conditions. Other actions, such as
altering the present main stack configuration and increased efforts to reduce
fugitive emissions, may be necessary at significant increased costs to achieve
compliance commencing during the later years of or after the nine-year PAMA
compliance period.
 
    SEWAGE/GARBAGE MANAGEMENT.  Two conventional sewage treatment systems and
collection systems will be installed to service the 3,000 employees of Doe Run
Peru living in company housing in La Oroya. A garbage collection system and
disposal landfill also will be developed. This project is designed to comply
with the PAMA and will improve living conditions in La Oroya. The project is
intended to eliminate the discharge of raw sewage and garbage by Doe Run Peru to
the Yauli and Mantaro Rivers. Planning and
 
                                       95
<PAGE>
design work will begin in fiscal 1998, and construction will follow in the next
two years at an estimated cost of $3.0 million.
 
  PENDING LITIGATION
 
    All existing litigation of Doe Run Peru at the time of the Acquisition was
retained by Centromin. Doe Run Peru is involved in various claims and lawsuits
incidental to the ordinary course of its business that are not expected to have
a material adverse effect on the business, financial condition and results of
operations of Doe Run Peru.
 
POTENTIAL ACQUISITION OF ASARCO'S MISSOURI LEAD DIVISION
 
    On July 28, 1998, Doe Run and ASARCO entered into the Asset Purchase
Agreement pursuant to which Doe Run will purchase certain assets relating to the
ASARCO MLD. The assets to be acquired include a primary lead smelter located in
Glover, Missouri, the lead mining operations at the Westfork and Sweetwater
production shafts located on the Viburnum Trend and associated equipment,
licenses, permits and leases. The Westfork and Sweetwater production shafts are
located adjacent to Doe Run's mining operations. The purchase price for these
assets is approximately $54.5 million payable at closing, plus contingent
deferred payments, if any. Such deferred payments are contingent upon prevailing
LME lead prices during the five-year period subsequent to the Potential ASARCO
MLD Acquisition. Specifically, Doe Run's obligations under the deferred purchase
price arrangement are determined annually and are only due if the annual LME
spot lead price exceeds $.28 per pound, with such payments not to exceed $12.5
million in the aggregate.
 
  PRODUCTS
 
    The ASARCO MLD's principal product is primary lead, and the ASARCO MLD
shipped approximately 127,000 tons of refined lead in 1997, which accounted for
approximately 92% of its sales in that period. In addition, the ASARCO MLD sells
zinc contentrates produced at its mills.
 
  MINING AND MILLING OPERATIONS
 
    GEOLOGY AND RESERVES
 
    Similar to Doe Run, the ASARCO MLD's operations are centered around the
ore-rich Viburnum Trend in Southeastern Missouri. See "--Doe Run--Mining
Operations--Geology." As of December 31, 1997, the ASARCO MLD's ore reserves
consisted of approximately 16.8 million proven and probable tons, containing
approximately 0.8 million tons of recoverable lead or approximately seven years
of production at current mining rates. These ore reserve estimates have been
provided by ASARCO'S technical personnel and have not been audited by a
consulting firm. There can be no assurance that these ore reserve estimates
would be the same if Doe Run were to apply its measurement methodology.
 
    PRODUCTION SHAFTS
 
    The ASARCO MLD operates two production shafts and two processing mills. The
Westfork production shaft and its mill are located in the central portion of the
Viburnum Trend and is bound to the north by Doe Run's Brushy Creek production
shaft and to the south by Doe Run's Fletcher production shaft. The Sweetwater
production shaft and its mill are located in the southern portion of the
Viburnum Trend. During 1997, the mining operations of the ASARCO MLD produced in
excess of 2.4 million tons of ore, containing average grades of 4.67% lead and
0.56% zinc. The geology, mining methods, equipment, production process and
product metal contents are substantially similar to Doe Run's mining and milling
operations. See "--Doe Run--Production Process" and "--Mining Operations." The
ASARCO MLD's mills produce lead and zinc concentrates. The lead concentrates are
shipped to the ASARCO MLD's Glover primary smelter for processing into refined
lead, and the zinc concentrates are sold to third party zinc smelters.
 
                                       96
<PAGE>
  SMELTING OPERATIONS
 
    Located in Glover, Missouri, approximately twenty miles southeast of the
Sweetwater production shaft, the Glover primary smelter commenced operations in
1968 and has been in continuous operations since that time. This facility
processes lead concentrates for the ASARCO MLD's adjacent mining operations, as
well as lead concentrates purchased from third parties. The Glover smelter has a
capacity of 135,000 tons per year and utilizes a pyrometallurgical process
similar to that utilized at Doe Run's Herculaneum smelter to produce 99.99%
refined lead. The ASARCO MLD recently invested in excess of $13 million to
improve the environmental performance of this facility, including ventilation
improvements at the sinter plant and blast furnace areas.
 
  EMPLOYEES
 
    As of April 30, 1998, of the 487 active employees of the ASARCO MLD, 136
were members of Local 7450 of the United Steelworkers of America (the "USWA").
Effective as of the closing of the Potential ASARCO MLD Acquisition,
substantially all of the ASARCO MLD employees will be terminated from employment
with the ASARCO MLD and will be offered employment under Doe Run's terms and
conditions upon successful completion of Doe Run's application process. Doe Run
has agreed to recognize the USWA to the extent required by law. Subsequent to
recognition, if required, Doe Run will begin the process of negotiating a
collective bargaining agreement with the USWA. Although Doe Run anticipates
that, if required, it would be able to reach agreement with the USWA, there can
be no assurance that such agreement will be reached.
 
  ENVIRONMENTAL MATTERS
 
    Pursuant to the Asset Purchase Agreement, Doe Run will not assume, and will
be indemnified for, any environmental liability or obligation arising out of the
conduct, ownership, use or operation of the ASARCO MLD assets to be acquired,
except with respect to certain matters specified below. Doe Run will assume all
continuing obligations at the Glover smelter in connection with a Consent Decree
with the State of Missouri with respect to achieving compliance with the ambient
air quality standard for lead. This Consent Decree required the installation of
certain environmental controls and the imposition of certain operating
conditions. The ASARCO MLD has fulfilled its obligations under the Consent
Decree and currently is in compliance with the ambient air quality standard, and
thus, Doe Run's obligation would be to continue compliance with the operating
conditions. Doe Run will also assume all obligations with respect to the closure
or cessation of operations at the Sweetwater and Westfork mines and the Glover
smelter. Missouri closure permits for the Glover smelter and its slag pile and
the Sweetwater and Westfork mine facilities and their tailings areas set forth
the actions required to be performed when such facilities cease operations.
 
  DESCRIPTION OF THE ASSET PURCHASE AGREEMENT
 
    Doe Run entered into the Asset Purchase Agreement on July 28, 1998. The
Asset Purchase Agreement requires Doe Run to purchase, on a going concern basis,
the ASARCO MLD at a purchase price of approximately $54.5 million (including an
agreed valuation of inventory) and to transfer certain assets to ASARCO. The
purchase price is subject to adjustment following the closing date to reflect
the actual inventory at the closing date. Doe Run plans to close the
transactions contemplated by the Asset Purchase Agreement on or about September
1, 1998.
 
    ASSETS AND LIABILITIES ASSUMED AND DISPOSED
 
    Upon closing the Potential ASARCO MLD Acquisition, Doe Run will assume
certain assets, properties and rights of the ASARCO MLD, including the
Sweetwater and Westfork mines and the Glover smelter and machinery, equipment,
contracts and permits related thereto. Doe Run will not acquire certain
 
                                       97
<PAGE>
excluded assets, such as accounts receivable, as specified in the Asset Purchase
Agreement. Doe Run will also expressly assume liabilities of the ASARCO MLD
arising out of the conduct of the ASARCO MLD assets acquired on or after the
closing date.
 
    INDEMNIFICATION OF DOE RUN BY ASARCO
 
    ASARCO will indemnify Doe Run from and against any and all losses and
expenses incurred in connection with or arising from (i) any breach by ASARCO of
any of its covenants or warranties contained in the Asset Purchase Agreement;
(ii) the inaccuracy of any of ASARCO's representations or warranties contained
in the Asset Purchase Agreement; and (iii) any liability specifically retained
by ASARCO. Further, Doe Run and ASARCO have agreed upon a mechanism for
allocating certain environmental liabilities which may arise in the future. The
indemnification obligations of ASARCO (except as such obligations relate to
certain specified provisions of the Asset Purchase Agreement) are subject to the
following limitations: (a) ASARCO will indemnify Doe Run only to the extent the
aggregate amount of loss suffered by Doe Run exceeds $100,000 and (b) the
indemnification liability of ASARCO to Doe Run shall not exceed the adjusted
purchase price. Except as such obligations relate to certain specified
provisions of the Asset Purchase Agreement, the indemnification obligations of
ASARCO terminate 24 months after the closing date.
 
    REPRESENTATIONS, WARRANTIES AND COVENANTS
 
    The Asset Purchase Agreement contains customary representations and
warranties from ASARCO concerning, among other things, the accuracy of all
financial information provided to Doe Run in anticipation of the Potential
ASARCO MLD Acquisition, the availability of the transferred assets for use by
Doe Run, the legality of the use of the transferred assets, the status of
governmental permits, the transferred real property, the assigned leases, the
transferred personal property, the transferred intellectual property, the
condition of the transferred assets, condemnation, receivables and inventory,
employment issues, the status of contracts, environmental matters, the absence
of claims or actions pertaining to the ASARCO MLD, insurance, customers and
supplies, and the absence of undisclosed liabilities. In addition to the
foregoing representations and warranties, the Asset Purchase Agreement contains
customary covenants by ASARCO concerning, among other things, access to the
purchased assets, notification, securing of consents and approvals of regulatory
bodies, securing of consents to transfers of contracts from third parties,
actions prior to the closing date, and certain employment matters. Doe Run also
makes customary representations, warranties and covenants under the Asset
Purchase Agreement.
 
                                       98
<PAGE>
                                   MANAGEMENT
 
DIRECTORS AND OFFICERS
 
    The following table sets forth certain information regarding the directors
and executive officers of the Company:
 
<TABLE>
<CAPTION>
NAME                                         AGE                                   POSITION
- ---------------------------------------      ---      ------------------------------------------------------------------
<S>                                      <C>          <C>
Ira Leon Rennert.......................          64   Chairman and Director of Doe Run, Doe Run Cayman and FPI.
 
Jeffrey L. Zelms.......................          54   President and Chief Executive Officer of Doe Run and President of
                                                      Doe Run Cayman
 
Marvin K. Kaiser.......................          56   Vice President and Chief Financial Officer of Doe Run and FPI,
                                                      Vice President of Doe Run Cayman and Finance Manager of Doe Run
                                                      Mining and Doe Run Peru
 
Richard L. Amistadi....................          53   Vice President--Sales and Marketing of Doe Run
 
Gary E. Boyer..........................          57   Vice President--Mining of Doe Run
 
Kenneth R. Buckley.....................          59   Vice President--Primary and Secondary Smelting of Doe Run and
                                                      General Manager of Doe Run Mining and Doe Run Peru
 
David A. Chaput........................          40   Treasurer of Doe Run and President of FPI
 
Juan Carlos Huyhua, Ph.D. .............          46   Operations Manager of Doe Run Peru
 
Anthony W. Worcester...................          56   Technical Manager of Doe Run Mining and Doe Run Peru
</TABLE>
 
    IRA LEON RENNERT has been Chairman, Chief Executive Officer and principal
shareholder of Doe Run's and the Guarantors' parent company, Renco (including
predecessors), since Renco's first acquisition in 1975, Chairman and Director of
Doe Run since April 1994, Chairman and Director of Doe Run Cayman since October
1997 and Chairman and Director of FPI since August 1996. Renco holds controlling
interests in a number of manufacturing and distribution concerns operating in
businesses not competing with Doe Run including, WCI Steel, Inc., Renco Metals,
Inc., AM General Corporation and Lodestar Energy, Inc.
 
    JEFFREY L. ZELMS has served as President and Chief Executive Officer of Doe
Run's Predecessor and Doe Run since August 1984 and President of Doe Run Cayman
since October 1997. Mr. Zelms has over 30 years of experience in the mining
industry. Mr. Zelms serves on the boards of directors of BW/IP International,
Inc. and Homestake Mining Company.
 
    MARVIN K. KAISER has served as Vice President and Chief Financial Officer of
Doe Run's Predecessor and Doe Run since January 1994 and of FPI since April
1998, Vice President of Doe Run Cayman since October 1997 and Finance Manager of
Doe Run Mining and Doe Run Peru since October 1997. From June 1989 to December
1993, Mr. Kaiser was the Chief Financial Officer of AMAX Gold, Inc., a gold
producing company. Mr. Kaiser is a Certified Public Accountant.
 
    RICHARD L. AMISTADI has served as Vice President--Sales and Marketing of Doe
Run's Predecessor and Doe Run since November 1986. Mr. Amistadi has over twenty
years of experience in sales, marketing and product development of lead metal,
lead alloys, zinc metal, lead, zinc and copper concentrates and associated
by-products.
 
    GARY E. BOYER has been Vice President-Mining at Doe Run since January 1993.
He served as General Manager of mining and smelting operations of Doe Run's
Predecessor and Doe Run from January 1988 to
 
                                       99
<PAGE>
April 1997. From January 1990 to January 1993, he served as Vice
President-Smelting of Doe Run's Predecessor.
 
    KENNETH R. BUCKLEY has served as Vice President--Primary and Secondary
Smelting of Doe Run since September 1996 and General Manager of Doe Run Mining
and Doe Run Peru since October 1997. From January 1996 until September 1996, Mr.
Buckley was Vice President--Smelting of Doe Run. Mr. Buckley served as General
Manager--Resource Recycling Division of Doe Run's Predecessor and Doe Run from
September 1988 until January 1996. Mr. Buckley has over 34 years of experience
in managing metal milling and smelting operations in five countries.
 
    DAVID A. CHAPUT has served as Treasurer of Doe Run's Predecessor and Doe Run
since February 1993 and as President of FPI since September 1996. Mr. Chaput has
been employed by Doe Run's Predecessor and Doe Run since 1987 in various
financial management positions.
 
    JUAN CARLOS HUYHUA, PH.D., has been Operations Manager of Doe Run Peru since
October 1997. From January 1995 to June 1997, Dr. Huyhua was Chief Operating
Officer of Centromin. Dr. Huyhua has served in various capacities for Centromin
since 1978, including as Assistant General Manager--Metallurgical Operations,
General Superintendent--Smelting and Refining Department and
Manager--Metallurgical Operations. Dr. Huyhua received his doctorate in
Extractive Metallurgy from the New Mexico Institute of Mining and Technology in
1989.
 
    ANTHONY W. WORCESTER has served as Technical Manager of Doe Run Mining and
Doe Run Peru since October 1997. From January 1991 to October 1997, Mr.
Worcester was Technical Service Manager at Doe Run's lead smelter for Doe Run
and its predecessor. Mr. Worcester has held various other positions with Doe
Run's Predecessor since 1960.
 
EXECUTIVE COMPENSATION
 
    The following table sets forth certain information concerning compensation
of the named executive officers by Doe Run for services rendered to it in all
capacities:
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                         LONG-TERM
                                                                                       COMPENSATION
                                                                                       -------------
                                                               ANNUAL COMPENSATION(A)     PAYOUTS
                                                                                       -------------
                                                    FISCAL     ----------------------      LTIP          ALL OTHER
NAME AND POSITION                                    YEAR        SALARY      BONUS      PAYOUTS(B)    COMPENSATION(C)
- ------------------------------------------------  -----------  ----------  ----------  -------------  ---------------
<S>                                               <C>          <C>         <C>         <C>            <C>
Ira Leon Rennert(d).............................        1997       --          --           --         $   1,200,000
  Chairman of the Board
Jeffrey L. Zelms................................        1997   $  240,000  $  100,000   $   262,068           34,885
  President and Chief Executive Officer
Marvin K. Kaiser................................        1997      156,000      74,000        52,414           22,164
  Chief Financial Officer
Richard L. Amistadi.............................        1997      163,248      60,000        78,620           23,197
  Vice President--Sales and Marketing
Gary E. Boyer...................................        1997      135,216      60,000        52,414            5,492
  Vice President--Mining
Kenneth R. Buckley..............................        1997      142,132      60,000        26,207           21,657
  Vice President--Primary and Secondary Smelting
</TABLE>
 
- ------------------------
(a) Value of perquisites and other personal benefits did not exceed the lesser
    of $50,000 or 10% of total salary and bonus per named executive officer.
 
(b) The amounts shown as "LTIP Payouts" in the table for each named executive
    officer represent contractual payments under such officer's net worth
    appreciation agreements. See "--Net Worth Appreciation Agreements."
 
(c) The amounts shown as "All Other Compensation" in the table for each named
    executive officer, except Mr. Rennert, represent payments to Messrs. Zelms,
    Kaiser, Amistadi, Boyer and Buckley under the Profit Sharing Program of
    $2,688, $1,747, $1,828, $2,028 and $1,592, respectively, and under the
    gainsharing plan of $31,416, $20,420, $21,369, $3,464 and $20,065,
    respectively, and $781 of life
 
                                      100
<PAGE>
    insurance premiums for Mr. Zelms. See "Business--Doe Run--Benefit
    Plans--Profit Sharing Program" and "--Gainsharing Plan."
 
(d) Mr. Rennert receives no compensation directly from Doe Run. He is Chairman
    of the Board and the principal stockholder of Renco which receives a
    management fee from Doe Run pursuant to the Management Consultant Agreement
    (as defined). The amount shown as all other compensation to Mr. Rennert are
    the management fees paid by Doe Run to Renco for fiscal 1997. See "Certain
    Transactions--Transactions with Renco and its Affiliates."
 
  NET WORTH APPRECIATION AGREEMENTS
 
    The named executive officers (with the exception of Mr. Rennert) and six
other employees of Doe Run are each parties to net worth appreciation agreements
with Doe Run, pursuant to which, upon termination of each person's employment
with Doe Run, he is entitled to receive a fixed percentage of the increase in
the net worth of Doe Run, as defined, from a base date until the end of the
fiscal quarter preceding the date of his termination. Such amount is payable
without interest in 40 equal quarterly installments, commencing three months
after the termination of each person's employment, and at three month intervals
thereafter. It is anticipated that certain key employees of Doe Run Peru will
enter into net worth appreciation agreements with Doe Run Peru comparable to Doe
Run's net worth appreciation agreements.
 
    The following table summarizes the net worth appreciation agreements now
held by the named executive officers and the amounts earned thereunder.
 
<TABLE>
<CAPTION>
                                                                                      ACCUMULATED
                                                                                         AS OF
                                                       NET WORTH                      OCTOBER 31,
                                                     PERCENTAGE(A)     BASE DATE        1997(B)
                                                   -----------------  -----------  -----------------
<S>                                                <C>                <C>          <C>
 
Jeffrey L. Zelms.................................         5.0   %         4/7/94      $   333,700
 
Marvin K. Kaiser.................................         1.0             4/7/94           66,740
 
Richard L. Amistadi..............................         1.5             4/7/94          100,110
 
Gary E. Boyer....................................         1.0             4/7/94           66,740
 
Kenneth R. Buckley...............................         0.5             4/7/94           33,370
</TABLE>
 
- ------------------------
 
(a) Vested for each participant as to 80% as of March 31, 1998 and vesting for
    an additional 20% on March 31, 1999, provided that the respective
    participant remains in the employ of Doe Run until such date.
 
(b) Represents the gross aggregate amount that each participant is entitled to
    receive as of October 31, 1997, subject to the vesting terms of the
    applicable agreement.
 
    The net worth appreciation agreements also provide that, in the event of
payment of a dividend or a sale of Doe Run, the active participants will be
entitled to receive a percentage of the dividend or the net proceeds of the sale
equal to their maximum percentages under the agreements. Upon consummation of
the Transactions, approximately $264,000 was paid to Messrs. Zelms, Kaiser,
Amistadi, Buckley, Boyer and other employees of Doe Run, pursuant to the net
worth appreciation agreements.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    Doe Run, Doe Run Cayman, Doe Run Mining and Doe Run Peru have no
compensation committee. The compensation for the executive officers is fixed by
negotiations between such executive officers and Mr. Rennert on behalf of Renco.
 
                                      101
<PAGE>
EMPLOYMENT AGREEMENTS
 
    The named executive officers are parties to employment agreements with Doe
Run. Set forth below is a brief description of each such agreement.
 
    JEFFREY L. ZELMS entered into an Employment Agreement with Doe Run effective
as of April 7, 1994, with an initial term continuing until October 31, 1999 and
automatically renewable thereafter for additional one-year terms. Pursuant to
the terms of his agreement, Mr. Zelms's compensation is composed of (a) a base
annual salary, (b) a year-end bonus of not less than $50,000 nor more than
$100,000 as may be determined by Doe Run in its sole discretion and (c) such
additional amounts, if any, as the Board of Directors may determine from time to
time in its discretion.
 
    MARVIN K. KAISER entered into an Employment Agreement with Doe Run effective
as of April 7, 1994, with an initial term continuing until October 31, 1999 and
automatically renewable thereafter for additional one-year terms. Pursuant to
the terms of his agreement, Mr. Kaiser's compensation is composed of (a) a base
annual salary, (b) a year-end bonus of not less than $30,000 nor more than
$60,000 as may be determined by Doe Run in its sole discretion and (c) such
additional amounts, if any, as the Board of Directors may determine from time to
time in its discretion.
 
    RICHARD L. AMISTADI entered into an Employment Agreement with Doe Run
effective as of April 7, 1994, with an initial term continuing until October 31,
1999 and automatically renewable thereafter for additional one-year terms.
Pursuant to the terms of his agreement, Mr. Amistadi's compensation is composed
of (a) a base annual salary, (b) a year-end bonus of not less than $30,000 nor
more than $60,000 as may be determined by Doe Run in its sole discretion and (c)
such additional amounts, if any, as the Board of Directors may determine from
time to time in its discretion.
 
    GARY E. BOYER entered into an Employment Agreement with Doe Run effective as
of April 7, 1994, with an initial term continuing until October 31, 1999 and
automatically renewable thereafter for additional one-year terms. Pursuant to
the terms of his agreement, Mr. Boyer's compensation is composed of (a) a base
annual salary, (b) a year-end bonus of not less than $30,000 nor more than
$60,000 as may be determined by Doe Run in its sole discretion and (c) such
additional amounts, if any, as the Board of Directors may determine from time to
time in its discretion.
 
    KENNETH R. BUCKLEY entered into an Employment Agreement with Doe Run
effective as of January 1, 1996 (replacing a prior agreement), with an initial
term continuing until December 31, 2000, and automatically renewable thereafter
for additional one-year terms. Pursuant to the terms of his agreement, Mr.
Buckley's compensation is composed of (a) a base annual salary, (b) a year-end
bonus of not less than $30,000 nor more than $60,000 as may be determined by Doe
Run in its sole discretion and (c) such additional amounts, if any, as the Board
of Directors may determine from time to time in its discretion.
 
    Each of the above described employment agreements require that, during the
term of their employment, each of the above executive officers not, directly or
indirectly, engage in any aspect of the business of lead mining, milling,
recycling or sale within the continental United States as an officer, director,
partner, proprietor, investor, associate, employee or consultant except with Doe
Run. In addition, each of the above executive officers have agreed to maintain
the confidentiality of information obtained during their employment with Doe
Run.
 
                                      102
<PAGE>
                               SECURITY OWNERSHIP
 
    The following table sets forth certain information as of the date hereof
with respect to beneficial ownership of Doe Run's common stock by each
beneficial owner of 5% or more of the common stock, each director and each named
executive officer of Doe Run during the last fiscal year, and by all directors
and executive officers of Doe Run as a group. Except as otherwise noted, the
persons named in the table below have sole voting and investment power with
respect to all shares or interests, as applicable, shown as beneficially owned
by them.
 
<TABLE>
<CAPTION>
                                                                                                NUMBER OF
NAME                                                                                             SHARES       PERCENT
- ---------------------------------------------------------------------------------------------  -----------  -----------
<S>                                                                                            <C>          <C>
The Renco Group, Inc.(a)(b)..................................................................       1,000        100.0%
DR Acquisition Corp.(a)......................................................................       1,000        100.0
Ira Leon Rennert(a)(c).......................................................................       1,000        100.0
Jeffrey L. Zelms.............................................................................      --           --
Marvin K. Kaiser.............................................................................      --           --
Richard L. Amistadi..........................................................................      --           --
Gary E. Boyer................................................................................      --           --
Kenneth R. Buckley...........................................................................      --           --
All directors and executive officers of Doe Run as a group (7 persons).......................       1,000        100.0
</TABLE>
 
- ------------------------
 
(a) The address of this beneficial owner is c/o The Renco Group, Inc., 30
    Rockefeller Plaza, Suite 4225, New York, New York 10112.
 
(b) Renco is deemed to beneficially own the shares owned by DRA due to Renco's
    ownership of all of the outstanding capital stock of DRA.
 
(c) Mr. Rennert is deemed to beneficially own the interests and shares owned by
    Renco due to the ownership by himself and trusts established by him (but of
    which he is not a trustee) for himself and members of his family of a total
    of 97.9% of the outstanding common stock of Renco.
 
    By virtue of Renco's indirect ownership of 100.0% of the outstanding common
stock of Doe Run, and Mr. Rennert's ownership of a majority of the stock of
Renco, Mr. Rennert is in position to control actions that require the consent of
a majority of the holders of equity interests in Doe Run and its subsidiaries.
 
    The 2,500 shares of preferred stock of Doe Run, all of which were held by
Renco, were redeemed as part of the Transactions.
 
                                      103
<PAGE>
                              CERTAIN TRANSACTIONS
 
TRANSACTIONS WITH RENCO AND ITS AFFILIATES
 
    Under a management consultant agreement, dated as of April 7, 1994, as
amended (the "Management Consultant Agreement"), between Renco and Doe Run, Doe
Run pays an annual fee of $2.4 million to Renco. The Management Consultant
Agreement provides that Doe Run shall not make any payment thereunder which
would violate any of its agreements with respect to any of its outstanding
indebtedness. The Management Consultant Agreement extends to October 31, 2000
and thereafter shall continue for additional terms of three years each unless
sooner terminated by either party by giving six months prior written notice. In
the year ended October 31, 1997, Doe Run paid management fees to Renco in the
amount of $1.2 million. The Company believes that the cost of obtaining the type
and quality of services rendered by Renco under the Management Consultant
Agreement was, and continues to be, no less favorable than that at which the
Company could obtain such services from unaffiliated entities.
 
    To obtain the advantages of volume, Renco purchases certain insurance
coverages for its subsidiaries, including Doe Run and Doe Run Peru, and the cost
of such insurance, without markup, is reimbursed by the covered subsidiaries.
Currently, the major areas of insurance coverage obtained under the Renco
programs for Doe Run are property, business interruption and fidelity and for
Doe Run Peru are foreign general liability and fidelity, and the premiums for
property, business interruption, fidelity and foreign general liability (as
applicable) are allocated by Renco to its covered subsidiaries, substantially as
indicated in the underlying policies. Renco also purchases and administers
certain insurance policies exclusively for Doe Run, including fiduciary, general
and product liability, workers' compensation, political risk, automobile
liability, and casualty umbrella, and for Doe Run Peru, including property,
business interruption, general and product liability, workers' compensation,
automobile liability and casualty umbrella. The cost of such insurance, without
markup, is reimbursed by Doe Run and Doe Run Peru (as applicable) as incurred.
The total insurance cost under the Renco insurance programs incurred in fiscal
1997 by Doe Run was approximately $2.5 million and by Doe Run Peru was DE
MINIMIS. Doe Run and Doe Run Peru believe that their insurance costs were less
than they would have incurred if they had obtained their respective insurance
directly.
 
    Pursuant to a tax sharing agreement between Doe Run and Renco, Doe Run pays
to Renco an amount equal to the amount Doe Run would have been required to pay
for taxes on a stand-alone basis to the Internal Revenue Service and the
applicable state taxing authority, as the case may be, except that Doe Run will
not have the benefit of any of its tax loss carryforwards unless such tax losses
were a result of timing differences between Doe Run's accounting for tax and
financial reporting purposes. This agreement also provides that transactions
between Doe Run and Renco and its other subsidiaries are accounted for on a cash
basis and not on an accrual basis.
 
    Beginning in fiscal 1998, Doe Run sold, and may from time to time in the
future sell, zinc and other alloys to WCI Steel, Inc., an indirect subsidiary of
Renco. Doe Run believes that such sales were on an arm's length basis at a price
no less favorable than that at which Doe Run could have sold to unaffiliated
entities.
 
    Upon consummation of the Old Notes Offering, Doe Run paid a transaction fee
of $2.3 million to Renco.
 
INTERCOMPANY TRANSACTIONS
 
    Doe Run Peru pays a sales agency commission to Doe Run Mining pursuant to a
sales agency contract, dated as of March 9, 1998, by and between Doe Run Peru
and Doe Run Mining. The initial term is for a period of two years, automatically
renewable for additional one-year terms. Under this agreement, Doe Run Mining
acts as the sales agent for Doe Run Peru with respect to all sales of Doe Run
Peru's products within Peru and receives a commission of 3% of such sales.
 
                                      104
<PAGE>
    Doe Run Peru pays a sales agency commission to Doe Run pursuant to an
international sales agency and hedging services contract, dated as of March 9,
1998, by and between Doe Run Peru and Doe Run. The initial term is for a period
of two years, automatically renewable for additional one-year terms. Under this
agreement, Doe Run acts as the sales agent for Doe Run Peru with respect to all
sales of Doe Run Peru's products outside of Peru and receives a commission of 3%
of such sales.
 
    Doe Run Peru pays a fee to Doe Run Mining pursuant to a technical,
managerial and professional services agreement, dated as of March 9, 1998, by
and between Doe Run Peru and Doe Run Mining. The initial term is for a period of
two years, automatically renewable for additional one-year terms. Under this
agreement, Doe Run Mining provides technical, managerial and professional
services to Doe Run Peru with respect to its day-to-day operations and the
Capital Investment Program. As its technical, managerial and professional
services fee, Doe Run Mining receives 2% of Doe Run Peru's cash operating
expenses (excluding the sales agency commissions to Doe Run and Doe Run Mining)
and 10% of Doe Run Peru's capital expenditures.
 
    Doe Run Mining pays a fee to Doe Run pursuant to a United States services
agreement, dated as of March 9, 1998, by and between Doe Run Mining and Doe Run.
The initial term is for a period of two years, automatically renewable for
additional one-year terms. Under this agreement, Doe Run provides professional
services with respect to U.S. related matters and receives an annual fee of
between $4.0 and $5.0 million.
 
    Doe Run Mining pays a fee to Doe Run pursuant to a technical, managerial and
professional services agreement, dated as of March 9, 1998, by and between Doe
Run Mining and Doe Run. The initial term is for a period of two years,
automatically renewable for additional one-year terms. Under this agreement, Doe
Run provides technical, managerial and professional assistance with respect to
all aspects to Doe Run Peru's operations for an annual fee of $500,000.
 
    Doe Run Mining pays a fee to Doe Run pursuant to a Peruvian professional
services agreement, dated as of March 9, 1998, by and between Doe Run Mining and
Doe Run. The initial term is for a period of two years, automatically renewable
for additional one-year terms. Under this agreement, Doe Run provides all
technical, managerial and professional services within and partially outside of
Peru that Doe Run Mining will provide to Doe Run Peru in their agreement, and
Doe Run receives an annual fee of $350,000.
 
    Doe Run Mining pays a fee to Doe Run pursuant to a technology assistance
agreement, dated as of March 9, 1998, by and between Doe Run Mining and Doe Run.
The initial term is for a period of two years, automatically renewable for
additional one-year terms. Under this agreement, Doe Run provides technology
assistance for an annual fee of $250,000.
 
    Doe Run and Doe Run Peru have negotiated a fee of approximately $5.5 million
payable to Doe Run for management services provided by Doe Run for the period
October 23, 1997 through March 8, 1998.
 
                                      105
<PAGE>
                 DESCRIPTION OF NEW REVOLVING CREDIT FACILITIES
 
    The following descriptions of the New Doe Run Revolving Credit Facility and
the New Doe Run Peru Revolving Credit Facility do not purport to be complete and
are subject to, and qualified in their entirety by reference to, all of the
provisions of the respective credit agreements relating to the New Doe Run
Revolving Credit Facility and the New Doe Run Peru Revolving Credit Facility,
which are filed as exhibits to the Registration Statement. Capitalized terms
used herein and not otherwise defined have the meaning ascribed to such terms in
the Revolving Credit Facilities.
 
NEW DOE RUN REVOLVING CREDIT FACILITY
 
  GENERAL
 
    The $100.0 million New Doe Run Revolving Credit Facility is provided
pursuant to a Loan and Security Agreement, dated March 12, 1998, by and among
Doe Run, FPI and Congress Financial Corporation ("Congress"). As of June 30,
1998, $4.8 million (exclusive of outstanding letters of credit) was outstanding
under the New Doe Run Revolving Credit Facility. Under the New Doe Run Revolving
Credit Facility, Congress will, in its discretion, lend on a revolving basis to
Doe Run and/or FPI up to the sum of (a) 85% of the Net Amount of Eligible
Accounts plus (b) 60% of the Value of Eligible Inventory (but not more than a
loan value of $50.0 million) and (c) 25% of the Value of Eligible Stores
Inventory of Doe Run (but not more than a loan value of $2.5 million).
Collections from accounts are applied to reduce the loan balance, which may be
reborrowed up to the aforesaid limits. Congress may extend up to $10.0 million
of letter of credit accommodations within the limits set forth above.
 
  INTEREST
 
    Interest on the loan balance is payable monthly at the prime rate plus 0.75%
per annum. The interest rate on June 30, 1998 was 9.25%. In the event of a
default under the New Doe Run Revolving Credit Facility, the interest rate will
be 2.75% per annum in excess of such prime rate.
 
  SECURITY
 
    As security for the indebtedness under the New Doe Run Revolving Credit
Facility, Doe Run and FPI have granted to Congress a first security interest in
(a) all accounts, (b) certain general intangibles, (c) inventory, (d) all
present and future books and records relating to the foregoing and (e) all
products and proceeds of the foregoing.
 
  TERM
 
    The New Doe Run Revolving Credit Facility has a three-year term and
beginning on March 2001, can be renewed from year to year thereafter, PROVIDED
that the agreement may be terminated by any party as of March 2001 or any
subsequent anniversary date on 60 days advance written notice.
 
  CERTAIN COVENANTS
 
    In addition to customary covenants, the New Doe Run Revolving Credit
Facility requires that Doe Run and FPI be subject to certain covenants,
including, but not limited to, a restriction on the incurrence of additional
indebtedness, a restriction on the creation of additional liens, compliance with
certain financial covenants, certain restrictions on dividends, loans and
investments, restrictions on mergers and sales of assets and certain
restrictions on capital expenditures. If Doe Run or FPI were to fail to comply
with the covenants contained in the New Doe Run Revolving Credit Facility and
such noncompliance were not cured within the applicable cure period, if any,
such noncompliance would constitute an event of default that could, among other
things, result in the termination of the New Doe Run Revolving Credit Facility
and/or the acceleration of all amounts due thereunder. See "--Events of
Default."
 
                                      106
<PAGE>
  EVENTS OF DEFAULT
 
    The New Doe Run Revolving Credit Facility contains certain events of
default, including, without limitation, the following: (i) the failure of Doe
Run or FPI to pay any of its obligations under the New Doe Run Revolving Credit
Facility within three days after the due date; (ii) certain defaults by Doe Run
or FPI under various other indebtedness, in each case after any applicable grace
period; (iii) any default by Doe Run or FPI in the performance or observance of
the conditions and covenants of the New Doe Run Revolving Credit Facility or
related agreements, beyond any applicable cure period; (iv) any representation
or warranty made by Doe Run or FPI to Congress under the New Doe Run Revolving
Credit Facility proved to be false in any material respect; (v) certain
judgments against Doe Run or FPI; (vi) certain events of bankruptcy or
insolvency of Doe Run or FPI; or (vii) the occurrence of (a) any sale of all or
substantially all of the assets of Renco, Doe Run or FPI, (b) approval by
shareholders of any liquidation or dissolution of Renco, Doe Run or FPI, (c)
Renco or DRA ceasing to own 100% of the capital stock of Doe Run, (d) Renco
ceasing to own 100% of the capital stock of DRA, (e) Doe Run ceasing to own 100%
of the capital stock of FPI or (f) Ira Leon Rennert and his affiliates ceasing
to own at least 90% of Renco.
 
NEW DOE RUN PERU REVOLVING CREDIT FACILITY
 
  GENERAL
 
    Under the New Doe Run Peru Revolving Credit Facility, the revolving credit
lender will, in its discretion, lend and relend to Doe Run Peru up to not more
than $40,000,000. The loans shall not exceed the sum of (a) 85% of eligible
sales accounts plus (b) 70% of the eligible inventory accounts of purchased
concentrates plus (c) 30% of the eligible inventory accounts of raw materials
and products in process plus (d) 80% of the eligible inventory accounts of final
products. Doe Run Peru's collections from accounts are applied to reduce the
loan balance, which may be reborrowed up to the aforesaid limits. The revolving
credit lender may extend loans or letters of credit. The amount of individual
loans must be $1,000,000 or more.
 
  INTEREST
 
    Interest on Doe Run Peru's loan balance is payable at LIBOR (1-month,
3-month or 6-month, depending on the length of the loan) plus 1.5% per annum for
the first year of the term of the facility. The interest rate on June 30, 1998
was 7.25%. In the event of a nonpayment of any part of the principal or interest
owed under the New Doe Run Peru Revolving Credit Facility, Doe Run Peru would
pay additional interest of 3% per annum. After the first year of the term of the
loan and the end of each subsequent term, the revolving credit lender, in its
sole discretion, can review the interest rate with 30 days notice to Doe Run
Peru.
 
  SECURITY
 
    As security for the indebtedness of Doe Run Peru to the revolving credit
lender, Doe Run Peru has granted a security interest in certain sales collection
accounts and in certain concentrates, raw materials, products in process and end
products. Pursuant to a concentration collection agreement, Doe Run Peru has
agreed to maintain, irrevocably and unconditionally, two accounts, one in New
York, New York and one in Lima, Peru containing the proceeds of present and
future sales operations, as well as the collections generated from them.
Customers of Doe Run Peru are to directly deposit their payments into these
collection accounts. Pursuant to an ore collateral contract, Doe Run Peru has
granted a first priority interest to the revolving credit lender in Doe Run
Peru's concentrates, raw materials, products in process and end products, in
whatever state.
 
                                      107
<PAGE>
  TERM
 
    The New Doe Run Peru Revolving Credit Facility has a maximum term of four
years. The revolving credit lender may, in its sole discretion, at the end of
the first year or any subsequent year, extend the maximum term of the facility.
Doe Run Peru is to pay the revolving credit lender an annual agency fee and an
annual commitment fee under the New Doe Run Peru Revolving Credit Facility.
 
  CERTAIN COVENANTS
 
    In addition, the Doe Run Peru Revolving Credit Facility requires that Doe
Run Peru be subject to certain covenants, including, without limitation,
compliance with financial reporting requirements, abstaining from selling,
leasing, transferring or assigning the use of fixed assets without written
approval from the revolving credit lender, abstaining from selling or
transferring all or substantially all of any part of Doe Run Peru's assets
without the written approval from the revolving credit lender, abstaining from
assuming, creating or incurring additional indebtedness without the written
approval of the revolving credit lender, restrictions on liens unless they are
required by the concentration account agreement or the ore collateral contract
or by a governmental body or authority, and abstaining from paying dividends if
Doe Run Peru is in default under the Doe Run Peru Revolving Credit Facility. If
Doe Run Peru were to fail to comply with the covenants in the New Doe Run Peru
Revolving Credit Facility and such noncompliance were not cured within the
applicable cure period, if any, such noncompliance would constitute an event of
default that could, among other things, result in the termination of the New Doe
Run Peru Revolving Credit Facility and/or the acceleration of all amounts due
thereunder. See "--Events of Default."
 
  EVENTS OF DEFAULT
 
    The New Doe Run Peru Revolving Credit Facility contains certain events of
default, including, without limitation, the following: (i) the failure of Doe
Run Peru to pay any of its obligations to the lender when due; (ii) the falsity
of any representation or warranty; (iii) any default by Doe Run in the
performance or observance of its obligations under New Doe Run Peru Revolving
Credit Facility; (iv) certain events of bankruptcy or insolvency of Doe Run; (v)
the invalidity of the concentration account agreement or the ore collateral
contract; (vi) the failure of Doe Run to own directly or indirectly 66.66% of
the shares of Doe Run Peru; (vii) the expropriation by the Peruvian government
of any rights of the revolving credit lender in Doe Run Peru or of the ownership
or control of Doe Run Peru; and (viii) the occurrence of acts of war,
revolution, insurrection or terrorism in Peru that has a material adverse effect
on Doe Run Peru's capacity to comply with its obligations under the New Doe Run
Peru Revolving Credit Facility.
 
                                      108
<PAGE>
                            DESCRIPTION OF THE NOTES
 
   
    The Old Notes are and the Exchange Notes will be issued under the Indenture.
The following summary of the material provisions of the Indenture does not
purport to be complete and is subject to, and qualified in its entirety by
reference to, the provisions of the Indenture, including the definitions of
certain terms contained therein and those terms made part of the Indenture by
reference to the Trust Indenture Act of 1939, as amended (the "TIA"), as in
effect on the date of the Indenture. A copy of the Indenture is filed as an
exhibit to the Registration Statement. The definitions of certain capitalized
terms used in the following summary are set forth below under "--Certain
Definitions."
    
 
GENERAL
 
    The Notes are general unsecured obligations of Doe Run limited to $355.0
million in aggregate principal amount, of which $200.0 million are Fixed Rate
Notes and $55.0 million are Floating Rate Notes. Additional amounts of Notes in
an aggregate principal amount of up to $100.0 million may be issued under the
Indenture in one or more series from time to time, subject to the limitations
set forth under "--Certain Covenants--Limitation on Indebtedness." The Fixed
Rate Notes will mature on March 15, 2005. The Floating Rate Notes will mature on
March 15, 2003.
 
    Principal of, premium, if any, and interest on the Notes will be payable,
and the Notes will be exchangeable and transferable, at the office or agency of
Doe Run in New York City maintained for such purposes (which initially is the
Trustee or its agent); PROVIDED that payment of interest may be made at the
option of Doe Run by check mailed to the registered holders of the Notes
("Holders") at their registered addresses. The Notes will be issued only in
fully registered form without coupons, in denominations of $1,000 and any
integral multiple thereof. No service charge will be made for any registration
of transfer, exchange or redemption of Notes, except in certain circumstances
for any tax or other governmental charge that may be imposed in connection
therewith.
 
INTEREST
 
    Interest on the Notes will be payable semi-annually in cash on each March 15
and September 15 (each an "Interest Payment Date") commencing on September 15,
1998, for the period commencing on and including the immediately preceding
Interest Payment Date and ending on and including the day next preceding the
Interest Payment Date (an "Interest Period"), with the exception that the first
Interest Period shall commence on and include March 12, 1998 and end on and
include September 14, 1998. Interest is payable to the persons who are
registered Holders at the close of business on the March 1 and September 1
immediately preceding the applicable Interest Payment Date.
 
  FIXED RATE NOTES
 
    Interest on the Fixed Rate Notes accrues at the rate of 11 1/4% per annum.
Interest on the Fixed Rate Notes will be computed on the basis of a 360 day year
composed of twelve 30 day months.
 
  FLOATING RATE NOTES
 
    The Floating Rate Notes accrues interest at a rate per annum, reset
semi-annually, equal to LIBOR plus 6.29%, as determined by the calculation agent
(the "Calculation Agent"), which is the Trustee.
 
    "LIBOR," with respect to an Interest Period, shall be the rate (expressed as
a percentage per annum) for deposits in United States dollars for a six-month
period beginning on the second London Banking Day (as defined) after the
Determination Date (as defined) that appears on Telerate Page 3750 (as defined)
as of 11:00 a.m., London time, on the Determination Date. If Telerate Page 3750
does not include such a rate or is unavailable on a Determination Date, LIBOR
for the Interest Period shall be the arithmetic mean of the rates (expressed as
a percentage per annum) for deposits in a Representative Amount (as defined) in
 
                                      109
<PAGE>
U.S. dollars for a six-month period beginning on the second London Banking Day
after the Determination Date that appears on Reuters Screen LIBO Page (as
defined) as of 11:00 a.m., London time, on the Determination Date. If Reuters
Screen LIBO Page does not include two or more rates or is unavailable on a
Determination Date, the Calculation Agent will request the principal London
office of each of four major banks in the London interbank market, as selected
by the Calculation Agent, to provide such bank's offered quotation (expressed as
a percentage per annum), as of approximately 11:00 a.m., London time, on such
Determination Date, to prime banks in the London interbank market for deposits
in a Representative Amount in U.S dollars for a six-month period beginning on
the second London Banking Day after the Determination Date. If at least two such
offered quotations are so provided, LIBOR for the Interest Period will be the
arithmetic mean of such quotations. If fewer than two such quotations are so
provided, the Calculation Agent will request each of three major banks in New
York City, as selected by the Calculation Agent, to provide such bank's rate
(expressed as a percentage per annum), as of approximately 11:00 a.m., New York
City time, on such Determination Date, for loans in a Representative Amount in
U.S. dollars to leading European banks for a six-month period beginning on the
second London Banking Day after the Determination Date. If at least two such
rates are so provided, LIBOR for the Interest Period will be the arithmetic mean
of such rates. If fewer than two such rates are so provided, then LIBOR for the
Interest Period will be LIBOR in effect with respect to the immediately
preceding Interest Period.
 
    "Determination Date," with respect to an Interest Period, will be the second
London Banking Day preceding the first day of the Interest Period.
 
    "London Banking Day" is any day in which dealings in U.S. dollars are
transacted or, with respect to any future date, are expected to be transacted in
the London interbank market.
 
    "Representative Amount" means a principal amount of not less than U.S.
$1,000,000 for a single transaction in the relevant market at the relevant time.
 
    "Telerate Page 3750" means the display designated as "Page 3750" on the Dow
Jones Telerate Service (or such other page as may replace Page 3750 on that
service).
 
    "Reuters Screen LIBO Page" means the display designated as page "LIBO" on
The Reuters Monitor Money Rates Service (or such other page as may replace the
LIBO page on that service).
 
    The amount of interest for each day that the Floating Rate Notes are
outstanding (the "Daily Interest Amount") will be calculated by dividing the
interest rate (expressed as a percentage per annum) in effect for such day by
360 and multiplying the result by the principal amount of the Floating Rate
Notes. The amount of interest to be paid on the Floating Rate Notes for each
Interest Period will be calculated by adding the Daily Interest Amounts for each
day in the Interest Period.
 
    All percentages resulting from any of the above calculations will be
rounded, if necessary, to the nearest one hundred-thousandth of a percentage
point, with five one-millionths of a percentage point rounded upwards (E.G.,
9.876545% (or .09876545) being rounded to 9.87655% (or .0987655)) and all dollar
amounts used in or resulting from such calculations will be rounded to the
nearest cent (with one-half cent being rounded upwards).
 
    The interest rate on the Floating Rate Notes will in no event be higher than
the maximum rate permitted by New York law as the same may be modified by U.S.
law of general application. Under current New York law, the maximum rate of
interest is 25% per annum on a simple interest basis. This limit may not apply
to Floating Rate Notes in which $2,500,000 or more has been invested.
 
    The Calculation Agent will, upon the request of the Holder of any Floating
Rate Note, provide the interest rate then in effect with respect to the Floating
Rate Notes. All calculations made by the Calculation Agent in the absence of
manifest error shall be conclusive for all purposes and binding on Doe Run and
the Holders of the Floating Rate Notes.
 
                                      110
<PAGE>
OPTIONAL REDEMPTION
 
    The Fixed Rate Notes will be subject to redemption, in whole or in part, at
the option of Doe Run, at any time on or after March 15, 2002, at the redemption
prices (expressed as percentages of principal amount) set forth below plus
accrued interest to the redemption date, if redeemed during the twelve month
period beginning on March 15 of the years indicated below:
 
<TABLE>
<CAPTION>
YEAR                                                                                PERCENTAGE
- ----------------------------------------------------------------------------------  -----------
<S>                                                                                 <C>
2002..............................................................................     105.625%
2003..............................................................................     102.813%
2004 and thereafter...............................................................     100.000%
</TABLE>
 
    The Floating Rate Notes are subject to redemption, in whole at any time or
in part from time to time, at the option of Doe Run, at the redemption prices
(expressed as percentages of principal amount) set forth below plus accrued
interest to the redemption date, if redeemed during the twelve month period
beginning on March 15 of the years indicated below:
 
<TABLE>
<CAPTION>
YEAR                                                                                PERCENTAGE
- ----------------------------------------------------------------------------------  -----------
<S>                                                                                 <C>
1998..............................................................................     104.000%
1999..............................................................................     103.000%
2000..............................................................................     102.000%
2001..............................................................................     101.000%
2002 and thereafter...............................................................     100.000%
</TABLE>
 
  OPTIONAL REDEMPTION OF FIXED RATE NOTES UPON EQUITY OFFERINGS
 
    In addition, at any time prior to March 15, 2001, Doe Run may redeem up to
35% of the sum of (x) the aggregate principal amount of the Fixed Rate Notes
issued in the Old Notes Offering plus (y) any additional Fixed Rate Notes issued
after the Issue Date pursuant to the Indenture, with the proceeds of one or more
Equity Offerings at a redemption price (expressed as a percentage of principal
amount) of 111.25% plus accrued interest to the redemption date; PROVIDED that
at least 65% of the sum of (x) the aggregate principal amount of Fixed Rate
Notes issued in the Old Notes Offering plus (y) any additional Fixed Rate Notes
issued after the Issue Date pursuant to the Indenture remains outstanding
immediately after any such redemption. In order to effect the foregoing
redemption with the proceeds of any Equity Offering, Doe Run shall make such
redemption not more than 120 days after the consummation of any such Equity
Offering. "Equity Offering" means an offering of Qualified Capital Stock of Doe
Run (other than to any Subsidiary of Doe Run).
 
SINKING FUND
 
    There will be no mandatory sinking fund payments for the Notes.
 
SELECTION AND NOTICE OF REDEMPTION
 
    In the event that less than all of the Notes are to be redeemed at any time,
selection of such Notes for redemption will be made by the Trustee in compliance
with the requirements of the principal national securities exchange or quotation
system, if any, on which such Notes are listed or, if such Notes are not then
listed on a national securities exchange or quotation system, on a proportionate
basis, by lot or by such method as the Trustee shall deem fair and appropriate;
PROVIDED, HOWEVER, that (i) no Notes of a principal amount of $1,000 or less
shall be redeemed in part and (ii) a redemption of Fixed Rate Notes with the net
cash proceeds of an Equity Offering shall be made on a proportionate basis
unless such method is otherwise prohibited. Notice of redemption shall be mailed
by first-class mail at least 30 but not more than 60 days before the redemption
date to each Holder of Notes to be redeemed at its registered
 
                                      111
<PAGE>
address. If any Note is to be redeemed in part only, the notice of redemption
that relates to such Note shall state the portion of the principal amount
thereof to be redeemed. A new Note in a principal amount equal to the unredeemed
portion thereof will be issued in the name of the Holder thereof upon
cancellation of the original Note. On and after the redemption date, interest
will cease to accrue on Notes or portions thereof called for redemption.
 
GUARANTEES
 
    Doe Run's obligations under the Notes are guaranteed in the manner described
below by the following Subsidiaries of Doe Run, FPI, Doe Run Cayman, Doe Run
Mining and Doe Run Peru, and, in the future, may be guaranteed by certain of Doe
Run's Restricted Subsidiaries. See "--Certain Covenants--Future Guarantees." The
only existing Subsidiary of Doe Run that is not a Guarantor is DR Exploration.
The laws of South Africa, DR Exploration's jurisdiction of organization, may not
permit DR Exploration to be a Guarantor.
 
    Each Guarantor fully and unconditionally guarantees, on a senior basis
(except as described below under "--Ranking" with respect to the Guarantee of
Doe Run Peru), jointly and severally, to each Holder and the Trustee, the full
and prompt performance of Doe Run's obligations under the Indenture and the
Notes, including the payment of principal of and interest on the Notes. The
obligations of each Guarantor are limited to the maximum amount which, after
giving effect to all other contingent and fixed liabilities of such Guarantor
and after giving effect to any collections from or payments made by or on behalf
of any other Guarantor in respect of the obligations of such other Guarantor
under its Guarantee or pursuant to its contribution obligations under the
Indenture, will result in the obligations of such Guarantor under the Guarantee
not constituting a fraudulent conveyance or fraudulent transfer under federal or
state law, in the case of domestic Guarantors, or any applicable foreign law, in
the case of foreign Guarantors. Each Guarantor that makes a payment or
distribution under a Guarantee shall be entitled to a contribution from each
other Guarantor in a proportionate amount, based on the net assets of each
Guarantor determined in accordance with GAAP.
 
    Each Guarantor may consolidate with or merge into or sell its assets to Doe
Run or to another Guarantor that is a Wholly-Owned Restricted Subsidiary without
limitation, or with other persons upon the terms and conditions set forth in the
Indenture. See "--Certain Covenants--Merger, Consolidation and Sale of Assets."
In the event that either all of the Capital Stock of a Guarantor is sold by Doe
Run or one of the Restricted Subsidiaries (whether by merger, stock purchase or
otherwise) or all or substantially all of the assets of a Guarantor are sold by
such Guarantor and such sale complies with the provisions set forth in
"--Certain Covenants--Limitation on Sale of Assets" and "--Change of Control"
and any other applicable provisions in the Indenture, the Guarantor's Guarantee
will be released.
 
RANKING
 
   
    Except as described below with respect to the Guarantee of Doe Run Peru, the
indebtedness of Doe Run and the Guarantors evidenced by the Notes and the
Guarantees rank senior in right of payment to all future unsecured senior
subordinated and subordinated indebtedness of Doe Run and the Guarantors,
respectively, and equally in right of payment with all other existing and future
unsubordinated indebtedness of Doe Run and the Guarantors. However, holders of
secured indebtedness of Doe Run and the Guarantors will have claims that
effectively rank prior to those of the Holders with respect to the assets
securing such indebtedness. As of June 30, 1998, the Company had approximately
$397.7 million of indebtedness outstanding (including the Back-to-Back Loan of
$125.0 million but exclusive of aggregate unused commitments of $129.7 million
under the New Revolving Credit Facilities), and none of the Company's
indebtedness was subordinated to the Old Notes.
    
 
    Notwithstanding the foregoing, the indebtedness of Doe Run Peru evidenced by
its Guarantee will be contractually subordinated to the indebtedness under the
Peruvian Revolving Credit Facility. In addition, except as described in the
preceding sentence, the indebtedness of Doe Run Mining and Doe Run Peru
 
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evidenced by their Guarantee rank senior in right of payment to all future
unsecured indebtedness of Doe Run Mining and Doe Run Peru, respectively, subject
to statutorily preferred exceptions and statutorily mandated priorities based on
the date of issuance with respect to payment of obligations under applicable
Peruvian law.
 
CERTAIN COVENANTS
 
    The Indenture contains, among others, the covenants discussed below. If Doe
Run or the Guarantors were to fail to comply with the covenants contained in the
Indenture and such noncompliance were not cured within the applicable cure
period, if any, such noncompliance would constitute an Event of Default that
could, among other things, result in the acceleration of all amounts due under
the Notes. See "-- Events of Default."
 
  LIMITATION ON INDEBTEDNESS
 
    (a) Doe Run will not, and will not cause or permit any of the Restricted
Subsidiaries to, directly or indirectly, create, incur, assume, guarantee,
become liable, contingently or otherwise, with respect to, or otherwise become
responsible for the payment of (collectively "incur") any Indebtedness
(including Acquired Indebtedness) other than Permitted Indebtedness; PROVIDED
that Doe Run and the Guarantors may incur Indebtedness (including Acquired
Indebtedness) if: (A) no Default or Event of Default shall have occurred and be
continuing at the time of the proposed incurrence thereof or shall occur as a
result of such proposed incurrence, and (B) after giving effect to such proposed
incurrence, the Consolidated Fixed Charge Coverage Ratio of Doe Run is at least
equal to 2.25 to 1.0. Notwithstanding the foregoing, a Restricted Subsidiary
that is not a Guarantor may incur Acquired Indebtedness to the extent such
Indebtedness could have been incurred by Doe Run and the Guarantors pursuant to
the proviso in the immediately preceding sentence.
 
    (b) Doe Run and the Guarantors shall not, directly or indirectly, in any
event incur any Indebtedness which by its terms (or by the terms of any
agreement governing such Indebtedness) is subordinated to any other Indebtedness
of Doe Run or such Guarantor unless such Indebtedness is also by its terms (or
by the terms of any agreement governing such Indebtedness) made expressly
subordinated to the Notes or the Guarantee of such Guarantor, as the case may
be, to the same extent and in the same manner as such Indebtedness is
subordinated to such other Indebtedness of Doe Run or such Guarantor.
 
  LIMITATION ON RESTRICTED PAYMENTS
 
    Doe Run will not, and will not permit any of the Restricted Subsidiaries to,
directly or indirectly, after the Issue Date (a) declare or pay any dividend or
make any distribution on Doe Run's Capital Stock or make any payment to holders
of such Capital Stock (other than dividends or distributions payable in
Qualified Capital Stock of Doe Run), (b) purchase, redeem or otherwise acquire
or retire for value any Capital Stock of Doe Run or any warrants, rights or
options to purchase or acquire shares of any class of such Capital Stock, (c)
purchase, redeem, prepay, defease or otherwise acquire or retire for value,
prior to any scheduled maturity, scheduled repayment or scheduled sinking fund
payment, Indebtedness of Doe Run or any of the Guarantors that is expressly
subordinate in right of payment to the Notes or the Guarantee of such Guarantor,
as the case may be, or (d) make any Investment (excluding any Permitted
Investment) (each of the foregoing actions set forth in clauses (a), (b), (c)
and (d) being referred to as a "Restricted Payment"), if at the time of such
Restricted Payment or immediately after giving effect thereto, (i) a Default or
an Event of Default shall have occurred and be continuing or (ii) Restricted
Payments made subsequent to the Issue Date (the amount expended for such
purposes, if other than in cash, shall be the Fair Market Value of such property
proposed to be transferred by Doe Run or such Restricted Subsidiary, as the case
may be, pursuant to such Restricted Payment) shall exceed the sum of:
 
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        (w) 50% of the cumulative Consolidated Net Income (or if cumulative
    Consolidated Net Income shall be a loss, minus 100% of such loss) of Doe Run
    earned subsequent to the Issue Date and prior to the date the Restricted
    Payment occurs (treating such period as a single accounting period);
 
        (x) 100% of the aggregate net proceeds, including the Fair Market Value
    of property other than cash, received by Doe Run from any person (other than
    a Subsidiary of Doe Run) from the issuance and sale subsequent to the Issue
    Date of Qualified Capital Stock of Doe Run (excluding (A) Qualified Capital
    Stock paid as a dividend on any Capital Stock or as interest on any
    Indebtedness, (B) any net proceeds from issuances and sales financed
    directly or indirectly using funds borrowed from Doe Run or any Subsidiary
    of Doe Run, until and to the extent such borrowing is repaid and (C) any net
    proceeds from any Equity Offering which are used to redeem Fixed Rate Notes
    pursuant to, and in accordance with, the provisions described under the
    caption "--Optional Redemption--Optional Redemption upon of Fixed Rate Notes
    Equity Offerings" above);
 
        (y) 100% of the aggregate net proceeds, including the Fair Market Value
    of property other than cash, received by Doe Run from any person (other than
    a Subsidiary of Doe Run) from the issuance and sale of Disqualified Capital
    Stock and/or Indebtedness, in each case that has been converted into or
    exchanged for Qualified Capital Stock of Doe Run after the Issue Date; and
 
        (z) without duplication, the sum of (1) the aggregate amount returned in
    cash on or with respect to Investments (other than Permitted Investments)
    made subsequent to the Issue Date whether through interest payments,
    principal payments, dividends or other distributions or payments, (2) the
    net cash proceeds received by Doe Run or any Restricted Subsidiary from the
    disposition of all or any portion of such Investments (other than to a
    Subsidiary of Doe Run) and (3) upon redesignation of an Unrestricted
    Subsidiary as a Restricted Subsidiary, the Fair Market Value of such
    Subsidiary; PROVIDED, HOWEVER, that the sum of clauses (1),(2) and (3) above
    shall not exceed the aggregate amount of all such Investments made
    subsequent to the Issue Date.
 
    The foregoing provisions shall not prohibit:
 
        (1) the payment of any dividend within 60 days after the date of its
    declaration if the dividend would have been permitted on the date of
    declaration;
 
        (2) the acquisition of Capital Stock of Doe Run or Indebtedness of Doe
    Run or any Guarantor either (i) solely in exchange for shares of Qualified
    Capital Stock of Doe Run or (ii) through the application of net proceeds of
    a substantially concurrent sale for cash (other than to a Subsidiary of Doe
    Run) of shares of Qualified Capital Stock of Doe Run;
 
        (3) the acquisition of Indebtedness of Doe Run or any Guarantor that is
    expressly subordinate in right of payment to the Notes or such Guarantor's
    Guarantee, as the case may be, either (i) solely in exchange for
    Indebtedness of Doe Run or such Guarantor which is expressly subordinate in
    right of payment to the Notes or such Guarantor's Guarantee, as the case may
    be, at least to the extent that the Indebtedness being acquired is
    subordinated to the Notes or such Guarantor's Guarantee, as the case may be,
    and has no scheduled principal prepayment dates prior to the scheduled final
    maturity date of the Indebtedness being exchanged or (ii) through the
    application of net proceeds of a substantially concurrent sale for cash
    (other than to a Subsidiary of Doe Run) of Indebtedness of Doe Run or such
    Guarantor which is expressly subordinate in right of payment to the Notes or
    such Guarantor's Guarantee, as the case may be, at least to the extent that
    the Indebtedness being acquired is subordinated to the Notes or such
    Guarantor's Guarantee, as the case may be, and has no scheduled principal
    prepayment dates prior to the scheduled final maturity date of the
    Indebtedness being refinanced;
 
        (4) the making of payments by Doe Run or any of the Restricted
    Subsidiaries to DRA or Renco (A) no earlier than ten days prior to the date
    on which Renco is required to make its payments to the Internal Revenue
    Service or the applicable state taxing authority, as the case may be,
    pursuant to a tax sharing agreement (which tax sharing agreement provides
    that the payments thereunder shall not
 
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    exceed the amount Doe Run and its subsidiaries would have been required to
    pay for taxes on a stand-alone basis, except that Doe Run and its
    Subsidiaries will not have the benefit of any of its tax loss carryforwards
    unless such tax losses were a result of timing differences between Doe Run's
    and its Subsidiaries' accounting for tax and financial reporting purposes,
    and which tax sharing agreement also provides that transactions between Doe
    Run, DRA and Renco and Renco's other Subsidiaries are accounted for on a
    cash basis and not on an accrual basis) and (B) to reimburse DRA or Renco
    for out of pocket insurance payments made by DRA or Renco on behalf of Doe
    Run and its Subsidiaries;
 
        (5) the payment by Doe Run or any of the Restricted Subsidiaries of a
    management fee to Renco in an amount not to exceed $200,000 in any month;
 
        (6) the repurchase from Renco on the Issue Date of Doe Run's outstanding
    2,500 shares of preferred stock, par value $1,000 per share, including the
    payment of accrued and unpaid dividends thereon, in an aggregate amount of
    approximately $2.8 million; and
 
        (7) the payment on the Issue Date of a transaction fee to Renco in an
    amount of approximately $2.2 million;
 
PROVIDED that in the case of clauses (2), (3) and (5), no Default or Event of
Default shall have occurred and be continuing at the time of such payment or as
a result thereof.
 
    In determining the aggregate amount of Restricted Payments permissible under
clause (ii) of the first paragraph of this section, amounts expended, incurred
or outstanding pursuant to clauses (1) and (2) (but not pursuant to clauses (3),
(4), (5), (6) or (7)) of the second paragraph of this section shall be included
as Restricted Payments; PROVIDED that any proceeds received from the issuance of
Qualified Capital Stock pursuant to clause (2) of the second paragraph of this
section shall be included in calculating the amount referred to in clause (x) or
clause (y), as the case may be, of the first paragraph of this section.
 
  LIMITATION ON SALE OF ASSETS
 
    Doe Run will not, and will not permit any of the Restricted Subsidiaries to,
consummate any Asset Sale unless (i) such Asset Sale is for at least Fair Market
Value, (ii) at least 80% of the consideration therefrom received by Doe Run or
such Restricted Subsidiary is in the form of cash or Cash Equivalents and (iii)
Doe Run or such Restricted Subsidiary shall apply the Net Cash Proceeds of such
Asset Sale within 270 days of receipt thereof, as follows:
 
        (a) first, to repay (and, in the case of any revolving credit facility,
    effect a permanent reduction in the commitment thereunder) any Indebtedness
    secured by the assets involved in such Asset Sale or otherwise required to
    be repaid with the proceeds thereof; and
 
        (b) second, with respect to any Net Cash Proceeds remaining after
    application pursuant to the preceding paragraph (a) (the "Available
    Amount"), Doe Run shall make an offer to purchase (the "Asset Sale Offer")
    from all Holders of Notes, up to a maximum principal amount (expressed as a
    multiple of $1,000) of Notes equal to the Available Amount at a purchase
    price equal to 100% of the principal amount thereof plus accrued and unpaid
    interest thereon, if any, to the date of purchase; PROVIDED, HOWEVER, that
    Doe Run will not be required to apply pursuant to this paragraph (b) Net
    Cash Proceeds received from any Asset Sale if, and only to the extent that,
    such Net Cash Proceeds are applied to a Related Business Investment within
    270 days of such Asset Sale; PROVIDED, FURTHER, that if at any time any
    non-cash consideration received by Doe Run or any Restricted Subsidiary, as
    the case may be, in connection with any Asset Sale is converted into or sold
    or otherwise disposed of for cash, then such conversion or disposition shall
    be deemed to constitute an Asset Sale under the Indenture and the Net Cash
    Proceeds thereof shall be applied in accordance with this "Limitation on
    Sale of Assets" covenant; and PROVIDED, FURTHER, that Doe Run may defer the
    Asset Sale Offer until there is an aggregate unutilized Available Amount
    equal to or in excess of $5 million resulting from one or more Asset Sales
    (at which time, the entire unutilized Available Amount, and not just the
    amount in excess of $5 million, shall be applied as required pursuant to
    this paragraph). To the extent the Asset Sale Offer is not fully subscribed
    to by Holders of the Notes, Doe Run and the Restricted Subsidiaries may
    retain such unutilized portion of the Available Amount and use it for any
    purpose not prohibited by the Indenture.
 
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    In the event of the transfer of substantially all (but not all) of the
property and assets of Doe Run and the Restricted Subsidiaries as an entirety to
a person in a transaction permitted under "--Merger, Consolidation, Etc." below,
the successor corporation shall be deemed to have sold the properties and assets
of Doe Run and the Restricted Subsidiaries not so transferred for purposes of
this covenant, and shall comply with the provisions of this covenant with
respect to such deemed sale as if it were an Asset Sale. In addition, the Fair
Market Value of such properties and assets of Doe Run or the Restricted
Subsidiaries deemed to be sold shall be deemed to be Net Cash Proceeds for
purposes of this covenant.
 
    Notice of an Asset Sale Offer will be mailed to the record Holders as shown
on the register of Holders not less than 30 days nor more than 60 days before
the payment date for the Asset Sale Offer, with a copy to the Trustee, and shall
comply with the procedures set forth in the Indenture. Upon receiving notice of
the Asset Sale Offer, Holders may elect to tender their Notes in whole or in
part in integral multiples of $1,000 principal amount at maturity in exchange
for cash. To the extent Holders properly tender Notes in an amount exceeding the
Available Amount, Notes of tendering Holders will be repurchased on a
proportionate basis (based on amounts tendered). An Asset Sale Offer shall
remain open for a period of 20 business days or such longer period as may be
required by law.
 
    If an offer is made to repurchase the Notes pursuant to an Asset Sale Offer,
Doe Run will comply with all tender offer rules under state and Federal
securities laws, including, but not limited to, Section 14(e) under the Exchange
Act and Rule 14e-1 thereunder, to the extent applicable to such offer.
 
  CHANGE OF CONTROL
 
    Upon the occurrence of a Change of Control, Doe Run shall be obligated to
make an offer to purchase (a "Change of Control Offer"), and shall, subject to
the provisions described below, purchase, on a business day (the "Change of
Control Purchase Date") not more than 60 nor less than 45 days following the
occurrence of the Change of Control, all of the then outstanding Notes at a
purchase price (the "Change of Control Purchase Price") equal to 101% of the
principal amount of the Notes plus accrued and unpaid interest thereon to the
date of purchase. Doe Run shall, subject to the provisions described below, be
required to purchase all Notes validly tendered into the Change of Control Offer
and not withdrawn. The Change of Control Offer is required to remain open for at
least 20 business days and until the close of business on the Change of Control
Purchase Date. See the definition of "Change of Control" under the caption
"--Certain Definitions" for a description of the events that would constitute a
Change of Control.
 
    In order to effect such Change of Control Offer, Doe Run shall, not later
than the 30th day after the Change of Control, mail to each Holder of Notes
notice of the Change of Control Offer, which notice shall govern the terms of
the Change of Control Offer and shall state, among other things, the procedures
that Holders of Notes must follow to accept the Change of Control Offer.
 
    If a Change of Control Offer is made, there can be no assurance that Doe Run
will have available funds sufficient to pay the Change of Control Purchase Price
for all of the Notes that might be delivered by Holders of Notes seeking to
accept the Change of Control Offer. Doe Run shall not be required to make a
Change of Control Offer upon a Change of Control if a third party makes the
Change of Control Offer in the manner, at the times and otherwise in compliance
with the requirements applicable to a Change of Control Offer made by Doe Run
and purchases all Notes validly tendered and not withdrawn under such Change of
Control Offer.
 
    In addition to the provisions of the Indenture relating to a Change of
Control described in this section, the Revolving Credit Facilities ($10.3
million outstanding as of June 30, 1998) contain provisions that would trigger
an event of default in the event of a change of control. See "Description of New
Revolving Credit Facilities--New Doe Run Revolving Credit Facility--Events of
Default" and "--New Doe Run Peru Revolving Credit Facility--Events of Default."
Doe Run and the Guarantors could enter into certain transactions, including
acquisitions, refinancings or other recapitalizations, that could affect their
respective capital structure or the value of the Notes, but that would not
constitute a Change of Control or a change of control under the Revolving Credit
Facilities. Doe Run's and the Guarantors' ability to repurchase Notes following
a Change of Control, or to repay indebtedness outstanding under the
 
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Revolving Credit Facilities following a change of control, may be limited by Doe
Run's and the Guarantors' then existing financial resources.
 
    In the event that a Change of Control occurs and Doe Run is required to
purchase the Notes as described above, Doe Run will comply with all tender offer
rules under state and Federal securities laws, including, but not limited to,
Section 14(e) under the Exchange Act and Rule 14e-1 thereunder, to the extent
applicable to such offer.
 
  LIMITATION ON LIENS
 
    Doe Run will not, and will not permit any of the Restricted Subsidiaries to,
directly or indirectly, create, incur, assume or suffer to exist any Liens upon
any properties or assets of Doe Run (including, without limitation, any Capital
Stock of a Restricted Subsidiary) or any of the Restricted Subsidiaries whether
owned on the Issue Date or acquired after the Issue Date, or on any income or
profits therefrom, or assign or otherwise convey any right to receive income or
profits thereon other than (i) Liens existing on the Issue Date to the extent
and in the manner such Liens are in effect on the Issue Date, (ii) Liens on the
non-fixed assets of Doe Run and the Restricted Subsidiaries securing
Indebtedness under the Revolving Credit Facilities and (iii) Permitted Liens.
 
  LIMITATION ON DIVIDENDS AND OTHER PAYMENT RESTRICTIONS AFFECTING RESTRICTED
  SUBSIDIARIES
 
    Doe Run will not, and will not permit any of the Restricted Subsidiaries to,
directly or indirectly, create or otherwise cause or suffer to exist or become
effective any encumbrance or restriction on the ability of any Restricted
Subsidiary to: (a) pay dividends or make any other distributions on its Capital
Stock, or any other interest or participation in, or measured by, its profits,
owned by Doe Run or by any Restricted Subsidiary, or pay any Indebtedness owed
to Doe Run or any Restricted Subsidiary; (b) make loans or advances to Doe Run
or any Restricted Subsidiary; or (c) transfer any of its properties or assets to
Doe Run or to any Restricted Subsidiary, except for such encumbrances or
restrictions existing under or by reason of: (i) applicable law; (ii) the
Indenture; (iii) customary non-assignment provisions of any lease governing a
leasehold interest of Doe Run or any Restricted Subsidiary; (iv) any instrument
governing Indebtedness of a person acquired by Doe Run or any Restricted
Subsidiary at the time of such acquisition, which encumbrance or restriction is
not applicable to any person, or the properties or assets of any person, other
than the person or its Subsidiaries so acquired; (v) any written agreement
existing on the Issue Date or amendments or modifications thereto, PROVIDED that
no such agreement shall be modified or amended in such a manner as to make the
encumbrance or restriction more restrictive than as in effect on the Issue Date;
(vi) Indebtedness existing and as in effect on the Issue Date, including,
without limitation, the U.S. Revolving Credit Facility or any refinancing,
refunding, replacement or extensions thereof, PROVIDED that any such encumbrance
or restriction contained in any refinancing, refunding, replacement or extension
of the U.S. Revolving Credit Facility shall be no more restrictive than such
encumbrance or restriction contained in the U.S. Revolving Credit Facility as in
effect on the Issue Date; (vii) Indebtedness under the Peruvian Revolving Credit
Facility or any refinancings, refundings, replacements or extensions thereof,
PROVIDED that such restrictions do not prohibit payments pursuant to the
intercompany agreements between Doe Run and the Restricted Subsidiaries as in
effect on the Issue Date or pursuant to any replacements thereof or pursuant to
any comparable agreements thereto, in each case providing for the same or
similar payments; and (viii) Indebtedness incurred in accordance with the
Indenture, PROVIDED that such encumbrance or restriction shall be no more
restrictive than any encumbrance or restriction contained in the Revolving
Credit Facilities.
 
  LIMITATION ON SALE/LEASEBACK TRANSACTIONS
 
    Doe Run will not, and will not permit any of the Restricted Subsidiaries to,
enter into any Sale/ leaseback. Notwithstanding the foregoing, Doe Run and the
Restricted Subsidiaries may enter into a Sale/ leaseback if (i) after giving pro
forma effect to any such Sale/leaseback, Doe Run and the Restricted Subsidiaries
shall be in compliance with the "Limitation on Indebtedness" covenant described
above, (ii) the sale price in such Sale/leaseback is at least equal to the Fair
Market Value of such property and
 
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(iii) Doe Run or such Restricted Subsidiary shall apply the Net Cash Proceeds of
the sale as provided under "Limitation on Sale of Assets" above, to the extent
required by such covenant.
 
  LIMITATION ON TRANSACTIONS WITH AFFILIATES
 
    (a) Doe Run will not, and will not permit any of the Restricted Subsidiaries
to, directly or indirectly, enter into or permit to exist any transaction
(including, without limitation, the purchase, sale, lease or exchange of any
property or the rendering of any service) with or for the benefit of an
Affiliate of Doe Run or any Restricted Subsidiary (other than transactions
between Doe Run and a Wholly-Owned Restricted Subsidiary or between Wholly-Owned
Restricted Subsidiaries) (an "Affiliate Transaction"), other than (x) Affiliate
Transactions permitted under (b) below and (y) Affiliate Transactions (including
lease transactions) on terms that are no less favorable to Doe Run or the
relevant Restricted Subsidiary in the aggregate than those that might reasonably
have been obtained in a comparable transaction by Doe Run or such Restricted
Subsidiary on an arm's-length basis (as determined in good faith by the Board of
Directors of Doe Run, as evidenced by a Board Resolution) from a person that is
not an Affiliate; PROVIDED that except as otherwise provided under (b) below,
neither Doe Run nor any of the Restricted Subsidiaries shall enter into an
Affiliate Transaction or series of related Affiliate Transactions involving or
having a value of more than $5.0 million unless Doe Run or such Restricted
Subsidiary, as the case may be, has received an opinion from an Independent
Financial Advisor, with a copy thereof to the Trustee, to the effect that the
financial terms of such Affiliate Transaction are fair and reasonable to Doe Run
or such Restricted Subsidiary, as the case may be, and such terms are no less
favorable to Doe Run or such Restricted Subsidiary, as the case may be, than
those that could be obtained in a comparable transaction on an arm's-length
basis with a person that is not an Affiliate.
 
    (b) The foregoing provisions shall not apply to (i) any Restricted Payment
that is made in compliance with the covenant entitled "Limitation on Restricted
Payments," (ii) payments by Doe Run or any of the Restricted Subsidiaries to
Renco or DRA of the amounts set forth in clauses (4), (5), (6) and (7) of the
second paragraph of the covenant entitled "Limitation on Restricted Payments"
and (iii) reasonable and customary regular fees to directors of Doe Run and the
Restricted Subsidiaries who are not employees of Doe Run and the Restricted
Subsidiaries.
 
  LIMITATION ON PREFERRED STOCK OF RESTRICTED SUBSIDIARIES
 
    Doe Run will not permit any Restricted Subsidiary to issue any Preferred
Stock (except to Doe Run or a Wholly-Owned Restricted Subsidiary), nor will Doe
Run permit any person (other than Doe Run or a Wholly-Owned Restricted
Subsidiary) to hold any Preferred Stock of a Restricted Subsidiary.
 
  QUALIFYING INVESTMENT REQUIREMENTS
 
    At least semi-annually commencing April 30, 1998 until $120 million has been
expended by Doe Run Peru in the manner required by Section 4.5 of the
Subscription Agreement, (i) Doe Run Peru shall make Investments in Doe Run
Mining, which Investments, including any interest payable thereon, shall be
represented by promissory notes (the "Qualifying Investments Promissory Notes"),
in an amount equal to Doe Run Peru's expected Qualifying Investments for the
following six months and (ii) Doe Run Mining shall use the proceeds of each such
Qualifying Investment to prepay in part the promissory note issued by Doe Run
Mining to Metaloroya on October 23, 1997, the date of consummation of the
Acquisition; PROVIDED, FURTHER, that pending utilization of such proceeds for
Qualifying Investments, Doe Run Peru may repay outstanding loans under the
Peruvian Revolving Credit Facility.
 
  FUTURE GUARANTEES
 
    If Doe Run or any of the Restricted Subsidiaries transfers or causes to be
transferred, in one transaction or a series of related transactions, any
property to any Restricted Subsidiary that is not a Guarantor, or if Doe Run or
any of the Restricted Subsidiaries shall organize, acquire or otherwise invest
in another Restricted Subsidiary, in each case having total assets with a book
value in excess of $1 million, then such transferee or acquired or other
Restricted Subsidiary shall (i) execute and deliver to the Trustee
 
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a supplemental indenture in form reasonably satisfactory to the Trustee pursuant
to which such Restricted Subsidiary shall unconditionally guarantee all of Doe
Run's obligations under the Notes and the Indenture on the terms set forth in
the Indenture and (ii) deliver to the Trustee an Opinion of Counsel that such
supplemental indenture has been duly authorized, executed and delivered by such
Restricted Subsidiary and constitutes a legal, valid, binding and enforceable
obligation of such Restricted Subsidiary. Thereafter, such Restricted Subsidiary
shall be a Guarantor for all purposes of the Indenture. Notwithstanding the
foregoing, the following Restricted Subsidiaries shall not be required to become
Guarantors under the Indenture: (i) DR Exploration; (ii) any Restricted
Subsidiary formed or acquired in connection with Related Business Investments
made by Doe Run or any of the Restricted Subsidiaries pursuant to clause (iii)
of the definition of "Permitted Investment"; and (iii) any Restricted Subsidiary
which is not permitted by law to become a Guarantor under the Indenture.
 
  CONDUCT OF BUSINESS
 
    Doe Run and the Restricted Subsidiaries will not engage in any businesses
which are not the same, similar or reasonably related to the businesses in which
Doe Run and the Restricted Subsidiaries are engaged on the Issue Date.
 
REPORTS
 
    So long as any Note is outstanding, Doe Run will file with the Commission
and, within 15 days after it files them with the Commission, file with the
Trustee and mail or cause the Trustee to mail to the Holders at their addresses
as set forth in the register of the Notes copies of the annual reports on Form
10-K and of the information, documents and other reports which Doe Run is
required to file with the Commission pursuant to Section 13 or 15(d) of the
Exchange Act or which Doe Run would be required to file with the Commission if
Doe Run then had a class of securities registered under the Exchange Act. Such
financial information shall include annual reports containing consolidated
financial statements and notes thereto, together with an opinion thereon
expressed by an independent public accounting firm, management's discussion and
analysis of financial condition and results of operations as well as quarterly
reports containing unaudited condensed consolidated financial statements for the
first three quarters of every fiscal year.
 
MERGER, CONSOLIDATION, ETC.
 
    Doe Run will not, in a single transaction or series of related transactions,
consolidate or merge with or into, or sell, assign, transfer, lease, convey or
otherwise dispose of all or substantially all of its assets to, any person or
adopt a Plan of Liquidation unless: (i) either (1) Doe Run shall be the
surviving or continuing corporation or (2) the person (if other than Doe Run)
formed by such consolidation or the person into which Doe Run is merged or the
person which acquires by sale, assignment, transfer, lease, conveyance or
otherwise all or substantially all of the assets of Doe Run or in the case of a
Plan of Liquidation, the person to which assets of Doe Run have been transferred
(x) shall be a corporation organized and validly existing under the laws of the
United States or any State thereof or the District of Columbia and (y) shall
expressly assume, by supplemental indenture (in form and substance satisfactory
to the Trustee), executed and delivered to the Trustee, the due and punctual
payment of the principal of, and premium, if any, and interest on, all of the
Notes, and the performance of every covenant of the Indenture, the Notes and the
Registration Rights Agreement on the part of Doe Run to be performed or
observed; (ii) immediately after giving effect to such transaction and the
assumption contemplated by clause (y) above (including giving effect to any
Indebtedness and Acquired Indebtedness incurred or anticipated to be incurred in
connection with or in respect of such transaction), Doe Run (in the case of
clause (1) of the foregoing clause (i)) or such person (in the case of clause
(2) thereof) (a) shall have a Consolidated Net Worth (immediately after the
transaction but prior to any purchase accounting adjustments relating to such
transaction) equal to or greater than the Consolidated Net Worth of Doe Run
immediately prior to such transaction and (b) shall be able to incur (assuming a
market rate of interest with respect thereto) at least $1.00 of additional
Indebtedness (other than Permitted Indebtedness) as if it were Doe Run under
 
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paragraph (a) of "--Certain Covenants--Limitation on Indebtedness" above; (iii)
immediately before and after giving effect to such transaction and the
assumption contemplated by clause (y) above (including giving effect to any
Indebtedness and Acquired Indebtedness incurred or anticipated to be incurred in
connection with or in respect of the transaction), no Default or Event of
Default shall have occurred or be continuing; (iv) Doe Run or such person shall
have delivered to the Trustee (A) an Officers' Certificate and an Opinion of
Counsel (which counsel shall not be in-house counsel of Doe Run) each stating
that such consolidation, merger, conveyance, transfer or lease or Plan of
Liquidation and, if a supplemental indenture is required in connection with such
transaction, such supplemental indenture, comply with this provision of the
Indenture and that all conditions precedent in the Indenture relating to such
transaction have been satisfied and (B) a certificate from Doe Run's independent
certified public accountants stating that Doe Run has made the calculations
required by clause (ii) above in accordance with the terms of the Indenture; and
(v) neither Doe Run nor any Restricted Subsidiary nor such person, as the case
may be, would thereupon become obligated with respect to any Indebtedness
(including Acquired Indebtedness), nor any of its property or assets subject to
any Lien, unless Doe Run or such Restricted Subsidiary or such person, as the
case may be, could incur such Indebtedness (including Acquired Indebtedness) or
create such Lien under the Indenture (giving effect to such person being bound
by all the terms of the Indenture).
 
    Notwithstanding the foregoing, (i) the merger of Doe Run with an Affiliate
incorporated solely for the purpose of incorporating Doe Run in another
jurisdiction shall be permitted and (ii) the merger of Doe Run and any
Restricted Subsidiary shall be permitted.
 
    For purposes of the foregoing, the transfer (by lease, assignment, sale or
otherwise, in a single transaction or series of transactions) of all or
substantially all of the properties or assets of one or more Restricted
Subsidiaries, the Capital Stock of which constitutes all or substantially all of
the properties and assets of Doe Run, shall be deemed to be the transfer of all
or substantially all of the properties and assets of Doe Run.
 
    Each Guarantor (other than any Guarantor whose Guarantee is to be released
in accordance with the terms of the Guarantee and the Indenture in connection
with any transaction complying with the provisions of "--Limitation on Sale of
Assets") will not, and Doe Run will not cause or permit any Guarantor to,
consolidate with or merge with or into or sell, assign, transfer, lease, convey
or otherwise dispose of all or substantially all of its assets to any person
(other than a merger of Doe Run with any Guarantor or a merger of Guarantors)
unless: (i) the entity formed by or surviving any such consolidation or merger
(if other than the Guarantor) or to which such sale, lease, conveyance or other
disposition shall have been made is a corporation organized and validly existing
under the laws of the United States or any state thereof or the District of
Columbia or an entity organized and validly existing under the laws of the
foreign jurisdiction in which such Guarantor is organized; (ii) such entity
assumes by supplemental indenture all of the obligations of such Guarantor under
such Guarantee; and (iii) immediately after giving effect to such transaction,
no Default or Event of Default shall have occurred and be continuing.
 
    Upon any such consolidation, merger, conveyance, lease or transfer in
accordance with the foregoing, the successor person formed by such consolidation
or into which Doe Run or any other Guarantor, as the case may be, is merged or
to which such conveyance, lease or transfer is made will succeed to, and be
substituted for, and may exercise every right and power of, Doe Run or such
Guarantor, as the case may be, under the Indenture with the same effect as if
such successor had been named as Doe Run or such Guarantor, as the case may be,
therein, and thereafter (except in the case of a sale, assignment, transfer,
lease, conveyance or other disposition) the predecessor corporation will be
relieved of all further obligations and covenants under the Indenture and the
Notes, in the case of Doe Run, or its Guarantee, in the case of any Guarantor.
 
EVENTS OF DEFAULT
 
    The following are Events of Default under the Indenture:
 
        (a) Doe Run defaults in the payment of interest on the Notes when the
    same becomes due and payable and the Default continues for a period of 30
    days;
 
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        (b) Doe Run defaults in the payment of the stated principal amount of
    the Notes when the same becomes due and payable at maturity, upon
    acceleration or redemption pursuant to an offer to purchase required under
    the Indenture or otherwise;
 
        (c) Doe Run or any of the Guarantors fails to comply in all material
    respects with any of their other agreements contained in the Notes or the
    Indenture (including, without limitation, under the provisions of "--Certain
    Covenants--Change of Control," "--Certain Covenants--Limitation on Sale of
    Assets" and "--Merger, Consolidation, Etc."), and the Default continues for
    the period and after the notice specified below;
 
        (d) there shall be any default or defaults in the payment of principal
    or interest under one or more agreements, instruments, mortgages, bonds,
    debentures or other evidences of Indebtedness under which Doe Run or any
    Restricted Subsidiary then has outstanding Indebtedness in excess of $7.5
    million, individually or in the aggregate;
 
        (e) there shall be any default or defaults under one or more agreements,
    instruments, mortgages, bonds, debentures or other evidences of Indebtedness
    under which Doe Run or any Restricted Subsidiary then has outstanding
    Indebtedness in excess of $7.5 million, individually or in the aggregate,
    and such default or defaults have resulted in the acceleration of the
    maturity of such Indebtedness;
 
        (f) Doe Run or any of the Restricted Subsidiaries fails to perform
    (after giving effect to any applicable grace periods) any term, covenant,
    condition or provision of one or more agreements, instruments, mortgages,
    bonds, debentures or other evidences of Indebtedness under which Doe Run or
    any of the Restricted Subsidiaries then has outstanding Indebtedness in
    excess of $7.5 million, individually or in the aggregate, and such failure
    to perform results in the commencement of judicial proceedings to foreclose
    upon any assets of Doe Run or any of the Restricted Subsidiaries securing
    such Indebtedness or the holders of such Indebtedness shall have exercised
    any right under applicable law or applicable security documents to take
    ownership of any such assets in lieu of foreclosure;
 
        (g) one or more judgments, orders or decrees for the payment of money
    which either individually or in the aggregate at any one time exceed $7.5
    million shall be rendered against Doe Run or any of the Restricted
    Subsidiaries by a court of competent jurisdiction and shall remain
    undischarged and unbonded for a period (during which execution shall not be
    effectively stayed) of 60 consecutive days after such judgment becomes final
    and nonappealable;
 
        (h) Doe Run or any Significant Subsidiary (1) admits in writing its
    inability to pay its debts generally as they become due, (2) commences a
    voluntary case or proceeding under any Bankruptcy Law with respect to
    itself, (3) consents to the entry of a judgment, decree or order for relief
    against it in an involuntary case or proceeding under any Bankruptcy Law,
    (4) consents to the appointment of a Custodian of it or for substantially
    all of its property, (5) consents to or acquiesces in the institution of a
    bankruptcy or an insolvency proceeding against it, (6) makes a general
    assignment for the benefit of its creditors or (7) takes any corporate
    action to authorize or effect any of the foregoing;
 
        (i) a court of competent jurisdiction enters a judgment, decree or order
    for relief in respect of Doe Run or any Significant Subsidiary in an
    involuntary case or proceeding under any Bankruptcy Law which shall (1)
    approve as properly filed a petition seeking reorganization, arrangement,
    adjustment or composition in respect of Doe Run or any Significant
    Subsidiary, (2) appoint a Custodian of Doe Run or any Significant Subsidiary
    or for substantially all of its property or (3) order the winding-up or
    liquidation of its affairs, and such judgment, decree or order shall remain
    unstayed and in effect for a period of 60 consecutive days; or
 
        (j) any of the Guarantees of any Significant Subsidiary ceases to be in
    full force and effect or any of such Guarantees is declared to be null and
    void and unenforceable or any of such Guarantees is found to be invalid or,
    any such Guarantor denies its liability under its Guarantee (other than by
    reason of release of a Guarantor in accordance with the terms of the
    Indenture).
 
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    A Default under clause (c) above (other than in the case of any Default
under the provisions of "--Certain Covenants--Limitation on Sale of Assets,"
"--Certain Covenants--Change of Control" or "--Merger, Consolidation, Etc.,"
which Defaults shall be Events of Default without the notice and without the
passage of time specified in this paragraph) is not an Event of Default until
the Trustee notifies Doe Run, or the Holders of at least 25% in principal amount
of the outstanding Notes notify Doe Run and the Trustee, of the Default and Doe
Run does not cure the Default within 30 days after receipt of the notice. The
notice must specify the Default, demand that it be remedied and state that the
notice is a "Notice of Default." Such notice shall be given by the Trustee if so
requested by the Holders of at least 25% in principal amount of the Notes then
outstanding.
 
    If an Event of Default (other than an Event of Default specified in clause
(h) or (i) above) occurs and is continuing, then and in every such case the
Trustee or the Holders of not less than 25% in aggregate principal amount of the
then outstanding Notes may declare the unpaid principal of, premium, if any, and
accrued and unpaid interest on, all the Notes then outstanding to be due and
payable, by a notice in writing to Doe Run (and to the Trustee, if given by
Holders) and upon such declaration such principal amount, premium, if any, and
accrued and unpaid interest will become immediately due and payable,
notwithstanding anything contained in the Indenture or the Notes to the
contrary. If an Event of Default specified in clause (h) or (i) above occurs,
all unpaid principal of, and premium, if any, and accrued and unpaid interest
on, the Notes then outstanding will IPSO FACTO become immediately due and
payable without any declaration or other act on the part of the Trustee or any
Holder.
 
    Holders of the Notes may not enforce the Indenture or the Notes except as
provided in the Indenture. Subject to the provisions of the Indenture relating
to the duties of the Trustee, the Trustee is under no obligation to exercise any
of its rights or powers under the Indenture at the request, order or direction
of any of the Holders, unless such Holders have offered to the Trustee
reasonable indemnity. Subject to all provisions of the Indenture and applicable
law, the Holders of a majority in aggregate principal amount of the then
outstanding Notes have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Trustee or exercising
any trust or power conferred on the Trustee. The Trustee may withhold from
Holders notice of any continuing Default or Event of Default (except a Default
or Event of Default in the payment of principal of or premium, if any, or
interest on the Notes or that resulted from the failure to comply with the
provisions of "--Certain Covenants--Change of Control" or "--Merger,
Consolidation, Etc.") if it determines that withholding notice is in their
interest. The Holders of a majority in aggregate principal amount of the Notes
then outstanding by notice to the Trustee may rescind an acceleration and its
consequences if all existing Events of Default (other than the nonpayment of
principal of and premium, if any, and interest on the Notes which has become due
solely by virtue of such acceleration) have been cured or waived and if the
rescission would not conflict with any judgment or decree. No such rescission
shall affect any subsequent Default or impair any right consequent thereto.
 
    The Holders of a majority in aggregate principal amount of the Notes then
outstanding may, on behalf of the Holders of all the Notes, waive any past
Default or Event of Default under the Indenture and its consequences, except a
Default in the payment of principal of or premium, if any, or interest on the
Notes or in respect of a covenant or provision of the Indenture which cannot be
modified or amended without the consent of all Holders.
 
    Under the Indenture, Doe Run is required to provide an Officers' Certificate
to the Trustee promptly upon any such officer obtaining knowledge of any Default
or Event of Default (provided that such officers shall provide such
certification at least annually whether or not they know of any Default or Event
of Default) that has occurred and, if applicable, describe such Default or Event
of Default and the status thereof. In addition, for each fiscal year, Doe Run's
independent certified public accountants are required to certify to the Trustee
that they have reviewed the terms of the Indenture and the Notes as they relate
to accounting matters and whether, during the course of their audit examination,
any Default or Event of Default has come to their attention, and specifying the
nature and period of existence of any such Default or Event of Default.
 
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AMENDMENT, SUPPLEMENT AND WAIVER
 
    From time to time, Doe Run, the Guarantors and the Trustee may, without the
consent of the Holders, amend, waive or supplement the Indenture or the Notes
for certain specified purposes, including, among other things, curing
ambiguities, defects or inconsistencies, maintaining the qualification of the
Indenture under the TIA or making any change that does not adversely affect the
rights of any Holder. In addition, the Indenture contains provisions permitting
Doe Run, the Guarantors and the Trustee, with the consent of the Holders of not
less than a majority in aggregate principal amount of the then outstanding
Notes, to enter into any supplemental indenture for the purpose of adding,
changing or eliminating any of the provisions of the Indenture or of modifying
in any manner the rights of the Holders under the Indenture; PROVIDED that no
such supplemental indenture may without the consent of the Holder of each
outstanding Note affected thereby: (i) reduce the amount of Notes whose Holders
must consent to an amendment or waiver; (ii) reduce the rate of, or extend the
time for payment of, interest, including defaulted interest, on any Note; (iii)
reduce the principal of or premium on or change the fixed maturity of any Note;
(iv) make the principal of, or interest on, any Note payable in money other than
as provided for in the Indenture and the Notes; (v) make any change in
provisions relating to waivers of defaults, the ability of Holders to enforce
their right under the Indenture or in the matters discussed in these clauses (i)
through (x); (vi) waive a default in the payment of principal of or interest on,
or redemption or repurchase payment with respect to, any Notes, including,
without limitation, a failure to make payment when required upon a Change of
Control or after an Asset Sale Offer; (vii) adversely affect the ranking of the
Notes or the Guarantees in any material respect; (viii) change the Maturity Date
or alter the redemption provisions in a manner adverse to Holders; (ix) after
Doe Run's obligation to purchase the Notes arises thereunder, amend, modify or
change the obligation of Doe Run to make and consummate a Change of Control
Offer in the event of a Change of Control or an Asset Sale Offer in the event of
an Asset Sale or waive any default in the performance thereof or modify any of
the provisions or definitions with respect to any such offers; or (x) release
the Guarantee of any Significant Subsidiary.
 
DISCHARGE; DEFEASANCE
 
    The Indenture provides that Doe Run and the Guarantors may terminate their
obligations under the Notes, the Guarantees and the Indenture if: (i) all Notes
previously authenticated and delivered have been delivered to the Trustee for
cancellation or Doe Run and the Guarantors have paid all sums payable by them
thereunder, or (ii) Doe Run has irrevocably deposited or caused to be deposited
with the Trustee or the Paying Agent and conveyed all right, title and interest
for the benefit of the Holders of such Notes, under the terms of an irrevocable
trust agreement in form and substance satisfactory to the Trustee, as trust
funds in trust solely for the benefit of the Holders for that purpose, money or
U.S. government obligations maturing as to principal and interest in such
amounts and at such times as are sufficient without consideration of any
reinvestment of such interest to pay principal of, premium, if any, and interest
on such outstanding Notes to maturity; PROVIDED that, among other things, Doe
Run shall have delivered to the Trustee (i) either (a) in the case of a legal
defeasance, a ruling directed to the Trustee received from the Internal Revenue
Service to the effect that the Holders of such Notes will not recognize income,
gain or loss for Federal income tax purposes as a result of Doe Run's exercise
of its option under the defeasance provision of the Indenture and will be
subject to Federal income tax on the same amount and in the same manner and at
the same times as would have been the case if such option had not been exercised
or (b) an Opinion of Counsel to the same effect as the ruling described in
clause (a) above and, in the case of a legal defeasance, accompanied by a ruling
to that effect published by the Internal Revenue Service, unless there has been
a change in the applicable Federal income tax since the date of the Indenture
such that a ruling from the Internal Revenue Service is no longer required, and
(ii) an Opinion of Counsel to the effect that, assuming no intervening
bankruptcy of Doe Run between the date of deposit and the 91st day following the
date of deposit and that no Holder is an insider of Doe Run, after the passage
of 90 days following the deposit, the trust funds will not be subject to the
effect of any applicable bankruptcy, insolvency, reorganization or similar laws
affecting creditors' rights generally. Certain obligations of Doe Run and the
 
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Guarantors under the Indenture or the Notes, including the payment of interest
and principal, shall remain in full force and effect until such Notes have been
paid in full. Notwithstanding the foregoing, the ruling of the Internal Revenue
Service and the Opinion of Counsel required by clause (i) above with respect to
a legal defeasance need not be delivered if all Notes not theretofore delivered
to the Trustee for cancellation (x) have become due and payable, (y) will become
due and payable on the maturity date within one year or (z) are to be called for
redemption within one year under arrangements satisfactory to the Trustee for
the giving of notice of redemption by the Trustee in the name, and at the
expense, of Doe Run.
 
GOVERNING LAW
 
    The Indenture provides that it, the Notes and the Guarantees will be
governed by, and construed in accordance with, the laws of the State of New York
but without giving effect to applicable principles of conflicts of law to the
extent that the application of the law of another jurisdiction would be required
thereby.
 
THE TRUSTEE
 
    State Street Bank and Trust Company is serving as Trustee under the
Indenture.
 
    The Indenture provides that, except during the continuance of an Event of
Default, the Trustee will perform only such duties as are specifically set forth
in the Indenture. During the existence of an Event of Default, the Trustee will
exercise such rights and powers vested in it by the Indenture, and use the same
degree of care and skill in its exercise as a prudent person would exercise or
use under the circumstances in the conduct of such person's own affairs.
 
    The Indenture and the provisions of the TIA contain certain limitations on
the rights of the Trustee, should it become a creditor of Doe Run or the
Guarantors, to obtain payments of claims in certain cases or to realize on
certain property received in respect of any such claim as security or otherwise.
Subject to the TIA, the Trustee will be permitted to engage in other
transactions; PROVIDED that if the Trustee acquires any conflicting interest as
described in the TIA, it must eliminate such conflict or resign.
 
CERTAIN DEFINITIONS
 
    "Acquired Indebtedness" means Indebtedness of a person or any of its
Subsidiaries existing at the time such person becomes a Subsidiary (Restricted
Subsidiary, in the case of Doe Run) or assumed in connection with the
acquisition of assets from such person, including, without limitation,
Indebtedness incurred by such person in connection with, or in anticipation or
contemplation of, such person becoming a Subsidiary (Restricted Subsidiary, in
the case of Doe Run) or such acquisition.
 
    "Acquisition" means the acquisition on October 23, 1997 by Doe Run Peru of
Metaloroya pursuant to the Subscription Agreement.
 
    "Affiliate" of any specified person means any other person, directly or
indirectly, controlling or controlled by or under direct or indirect common
control with such specified person. For the purposes of this definition,
"control" when used with respect to any person means the power to direct the
management and policies of such person, directly or indirectly, whether through
the ownership of voting securities, by contract or otherwise; and the terms
"affiliated," "controlling" and "controlled" have meanings correlative of the
foregoing. For purposes of "--Certain Covenants--Limitation on Transactions with
Affiliates," the term "Affiliate" shall include any person who, as a result of
any transaction described therein, would become an Affiliate.
 
    "Asset Acquisition" means (i) an Investment by Doe Run or any Restricted
Subsidiary in any other person pursuant to which such person shall become a
Restricted Subsidiary or a Subsidiary of a Restricted Subsidiary or shall be
merged with Doe Run or any Restricted Subsidiary or (ii) the acquisition by Doe
 
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Run or any Restricted Subsidiary of the assets of any person which constitute
all or substantially all of the assets of such person or any division or line of
business of such person.
 
    "Asset Sale" means any direct or indirect sale, issuance, conveyance,
transfer, lease, assignment or other transfer for value by Doe Run or any of the
Restricted Subsidiaries (including, without limitation, any Sale/leaseback) to
any person, in one transaction or a series of related transactions, of (i) any
Capital Stock of any Restricted Subsidiary; (ii) all or substantially all of the
properties and assets of any division or line of business of Doe Run or any
Restricted Subsidiary; or (iii) any other properties or assets of Doe Run or any
Restricted Subsidiary other than in the ordinary course of business. For the
purposes of this definition, the term "Asset Sale" shall not include (i) any
sale, issuance, conveyance, transfer, lease or other disposition of properties
or assets that is consummated in accordance with the provisions of "-- Merger,
Consolidation, Etc." above and (ii) the sale of inventory in the ordinary course
of business.
 
    "Bankruptcy Law" means Title 11 of the U.S. Code or any similar Federal,
state or foreign law for the relief of debtors.
 
    "Capital Expenditures" shall mean payments for any assets, or improvements,
replacements, substitutions or additions thereto, that have a useful life of
more than one year and which, in accordance with GAAP consistently applied, are
required to be capitalized (as opposed to expensed in the period in which the
payment occurred).
 
    "Capital Lease," as applied to any person, means any lease of (or any
agreement conveying the right to use) any property (whether real, personal or
mixed) by such person as lessee which, in conformity with GAAP, is required to
be accounted for as a capital lease on the balance sheet of such person.
 
    "Capital Stock" means, with respect to any person, any and all shares,
interests, participation or other equivalents (however designated) of such
person's capital stock, whether outstanding at the Issue Date or issued after
the Issue Date, and any and all rights, warrants or options exchangeable for or
convertible into such capital stock (but excluding any debt security that is
exchangeable for or convertible into such capital stock).
 
    "Capitalized Lease Obligation" means, as to any person, the obligations of
such person under a Capital Lease and, for purposes of the Indenture, the amount
of such obligations at any date shall be the capitalized amount of such
obligations at such date, determined in accordance with GAAP.
 
    "Cash Equivalents" means (i) marketable direct obligations issued by, or
unconditionally guaranteed by, the United States Government or issued by any
agency thereof and backed by the full faith and credit of the United States, in
each case maturing within two years from the date of acquisition thereof; (ii)
marketable direct obligations issued by any state of the United States of
America or any political subdivision of any such state or any public
instrumentality thereof maturing within two years from the date of acquisition
thereof and, at the time of acquisition, having one of the two highest ratings
obtainable from either Standard & Poor's Ratings Services, a division of The
McGraw Hill Companies, Inc. ("S&P") or Moody's Investors Service, Inc.
("Moody's"); (iii) commercial paper maturing no more than two years from the
date of creation thereof and, at the time of acquisition, having a rating of at
least A-1 from S&P or at least P-1 from Moody's; (iv) certificates of deposit or
bankers' acceptances maturing within two years from the date of acquisition
thereof issued by any commercial bank organized under the laws of the United
States of America or any state thereof or the District of Columbia or any U.S.
branch of a foreign bank having at the date of acquisition thereof combined
capital and surplus of not less than $500,000,000; (v) repurchase obligations
with a term of not more than seven days for underlying securities of the types
described in clause (i) above entered into with any bank meeting the
qualifications specified in clause (iv) above; and (vi) investments in money
market funds which invest substantially all their assets in securities of the
types described in clauses (i) through (v) above. Notwithstanding the foregoing,
for purposes of clause (i) of the definition of "Permitted Investment," 20% of
the Cash Equivalents may include securities having a rating of at least BBB by
S&P and Baa by Moody's.
 
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    "Centromin" shall mean Empresa Minera del Centro del Peru S.A.
 
    "Change of Control" means the occurrence of one or more of the following
events: (i) any direct or indirect sale, lease, exchange or other transfer (in
one transaction or a series of related transactions) of all or substantially all
of the assets of Doe Run, DRA or Renco to any person or group of related persons
for purposes of Section 13(d) of the Exchange Act (a "Group") (other than a
Permitted Holder or a Group controlled by a Permitted Holder), together with any
Affiliates thereof (whether or not otherwise in compliance with the provisions
of the Indenture); (ii) the approval by the holders of Capital Stock of Doe Run,
DRA or Renco, as the case may be, of any plan or proposal for the liquidation or
dissolution of Doe Run, DRA or Renco, as the case may be (whether or not
otherwise in compliance with the provisions of the Indenture); (iii) the
acquisition in one or more transactions of "beneficial ownership" (within the
meaning of Rules 13d-3 and 13d-5 under the Exchange Act, except that a person
shall be deemed to have "beneficial ownership" of all securities that such
person has the right to acquire, whether such right is exercisable immediately
or only after the passage of time) by any person, entity or Group (other than a
Permitted Holder or a Group controlled by any Permitted Holder) of any Capital
Stock of Doe Run, DRA or Renco such that, as a result of such acquisition, such
person, entity or Group either (A) beneficially owns (within the meaning of
Rules 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, more than
50% of Doe Run's, DRA's or Renco's then outstanding voting securities entitled
to vote on a regular basis in an election for a majority of the Board of
Directors of Doe Run, DRA or Renco or (B) otherwise has the ability to elect,
directly or indirectly, a majority of the members of Doe Run's, DRA's or Renco's
Board of Directors; or (iv) the shareholders of Renco as of the Issue Date and
the Permitted Holders shall cease to own at least 50% of the equity of Renco
owned by such shareholders on the Issue Date. Notwithstanding anything to the
contrary contained in this definition or in the Indenture, a merger of DRA with
and into Doe Run or Renco shall not constitute a "Change of Control" under the
Indenture.
 
   
    In deeming a sale of assets by a corporation to be a sale of "all or
substantially all its assets" under New York law, the focus is not on the dollar
amount involved, but rather on the nature of the sale as it affects the ability
of the corporation to conduct the business for which it was established. If the
sale of certain assets is significant enough to render the corporation unable,
in whole or in part, to accomplish the purposes or objects for which it was
incorporated, such sale is not in the ordinary course of business and would be
deemed a sale of "all or substantially all its assets." So long as the
corporation remains able to conduct its business, the sale of such corporation's
assets, even its sole asset, may be within the ordinary course of business and
will not be deemed a sale of "all or substantially all its assets."
    
 
    "Commission" means the Securities and Exchange Commission.
 
    "Consolidated EBITDA" means, with respect to any person, for any period, the
sum (without duplication) of (i) Consolidated Net Income, (ii) to the extent
Consolidated Net Income has been reduced thereby, all income taxes of such
person and its Subsidiaries (Restricted Subsidiaries, in the case of Doe Run)
paid or accrued in accordance with GAAP for such period (other than income taxes
attributable to extraordinary, unusual or non-recurring gains or losses),
Consolidated Interest Expense (net of any interest income), amortization expense
(including amortization of deferred financing costs) and depletion and
depreciation expense and (iii) other non-cash items (other than non-cash
interest) reducing Consolidated Net Income (including, without limitation, any
non-cash charges in respect of post-employment benefits for health care, life
insurance and long- term disability benefits required in accordance with GAAP)
less other non-cash items increasing Consolidated Net Income, all as determined
on a consolidated basis for such person and its Subsidiaries (Restricted
Subsidiaries, in the case of Doe Run) in accordance with GAAP.
 
    "Consolidated Fixed Charge Coverage Ratio" means, with respect to any
person, the ratio of Consolidated EBITDA of such person during the four full
fiscal quarters (the "Four Quarter Period") ending on or prior to the date of
the transaction giving rise to the need to calculate the Consolidated Fixed
Charge Coverage Ratio (the "Transaction Date") to Consolidated Fixed Charges of
such person for the
 
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Four Quarter Period. For purposes of this definition, if the Transaction Date
occurs prior to the date on which four full fiscal quarters have elapsed
subsequent to the Issue Date and financial statements with respect thereto are
available, "Consolidated EBITDA" and "Consolidated Fixed Charges" shall be
calculated, in the case of Doe Run, after giving effect on a pro forma basis to
the issuance of the Notes and the application of the net proceeds therefrom
including the redemption of Doe Run's outstanding preferred stock on the Issue
Date as if the Notes were issued on the first day of the Four Quarter Period. In
addition to and without limitation of the foregoing, for purposes of this
definition, "Consolidated EBITDA" and "Consolidated Fixed Charges" shall be
calculated after giving effect on a pro forma basis for the period of such
calculation to (i) the incurrence of any Indebtedness (and the application of
the net proceeds therefrom) of such person or any of its Subsidiaries
(Restricted Subsidiaries, in the case of Doe Run) giving rise to the need to
make such calculation and any incurrence of other Indebtedness at any time on or
after the first day of the Four Quarter Period and on or prior to the
Transaction Date (the "Reference Period"), as if such incurrence occurred on the
first day of the Reference Period and (ii) any Asset Sales or Asset Acquisitions
(including, without limitation, any Asset Acquisition giving rise to the need to
make such calculation as a result of such person or one of its Subsidiaries
(Restricted Subsidiaries, in the case of Doe Run) (including any person who
becomes a Subsidiary (Restricted Subsidiary, in the case of Doe Run) as a result
of the Asset Acquisition) incurring, assuming or otherwise being liable for
Acquired Indebtedness) occurring during the Reference Period, as if such Asset
Sale or Asset Acquisition (including the incurrence, assumption or liability for
any such Indebtedness or Acquired Indebtedness) occurred on the first day of the
Reference Period. If such person or any of its Subsidiaries (Restricted
Subsidiaries, in the case of Doe Run) directly or indirectly guarantees
Indebtedness of a third person, the preceding sentence shall give effect to the
incurrence of such guaranteed Indebtedness as if such person or any Subsidiary
(Restricted Subsidiary, in the case of Doe Run) of such person had directly
incurred or otherwise assumed such guaranteed Indebtedness. Furthermore, in
calculating "Consolidated Fixed Charges" for purposes of determining the
denominator (but not the numerator) of this "Consolidated Fixed Charge Coverage
Ratio," (1) interest on Indebtedness determined on a fluctuating basis as of the
Transaction Date and which will continue to be so determined thereafter shall be
deemed to have accrued at a fixed rate per annum equal to the rate of interest
on such Indebtedness in effect on the Transaction Date, and (2) notwithstanding
clause (1) above, interest on Indebtedness determined on a fluctuating basis, to
the extent such interest is covered by agreements relating to Interest Rate
Protection Obligations, shall be deemed to accrue at the rate per annum
resulting after giving effect to the operation of such agreements.
 
    "Consolidated Fixed Charges" means, with respect to any person for any
period, the sum of, without duplication, the amounts for such period, taken as a
single accounting period, of (i) Consolidated Interest Expense of such person
(net of any interest income) less non-cash amortization of deferred financing
costs and (ii) the product of (x) the amount of all dividends declared, paid or
accrued on Preferred Stock of such person during such period times (y) a
fraction, the numerator of which is one and the denominator of which is one
minus the then current effective consolidated Federal, state, local and foreign
tax rate (expressed as a decimal number between 1 and 0) of such person during
such period (as reflected in the audited consolidated financial statements of
such person for the most recently completed fiscal year).
 
    "Consolidated Interest Expense" means, with respect to any person for any
period, without duplication, the sum of (i) the interest expense of such person
and its Subsidiaries (Restricted Subsidiaries, in the case of Doe Run) for such
period as determined on a consolidated basis in accordance with GAAP
consistently applied, including, without limitation, (a) any amortization of
debt discount, (b) the net cost under Interest Rate Protection Obligations
(including any amortization of discounts), (c) the interest portion of any
deferred payment obligation and (d) all accrued interest, and (ii) the interest
component of Capitalized Lease Obligations paid, accrued and/or scheduled to be
paid or accrued by such person and its Subsidiaries (Restricted Subsidiaries, in
the case of Doe Run) during such period as determined on a consolidated basis in
accordance with GAAP consistently applied.
 
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    "Consolidated Net Income" means, with respect to any person for any period,
the net income (or loss) of such person and its Subsidiaries (Restricted
Subsidiaries, in the case of Doe Run), on a consolidated basis for such period
determined in accordance with GAAP; PROVIDED that (i) the net income of any
person in which such person or any Subsidiary (Restricted Subsidiary, in the
case of Doe Run) of such person has an ownership interest with a third party
(other than a person that meets the definition of a Wholly-Owned Subsidiary
(Wholly-Owned Restricted Subsidiary, in the case of Doe Run)) shall be included
only to the extent of the amount that has actually been received by such person
or its Wholly-Owned Subsidiaries (Wholly-Owned Restricted Subsidiaries, in the
case of Doe Run) in the form of dividends or other distributions during such
period (subject to, in the case of any dividend or distribution received by a
Wholly-Owned Subsidiary (Wholly-Owned Restricted Subsidiary, in the case of Doe
Run) of such person, the restrictions set forth in clause (ii) below) and (ii)
the net income of any Subsidiary (Restricted Subsidiary, in the case of Doe Run)
of such person that is subject to any restriction or limitation on the payment
of dividends or the making of other distributions shall be excluded to the
extent of such restriction or limitation; PROVIDED, FURTHER that there shall be
excluded (a) the net income (or loss) of any person (acquired in a pooling of
interests transaction) accrued prior to the date it becomes a Subsidiary
(Restricted Subsidiary, in the case of Doe Run) of such person or is merged into
or consolidated with such person or any Subsidiary (Restricted Subsidiary, in
the case of Doe Run) of such person, (b) any gain (or loss) (and related tax
effects) resulting from an Asset Sale by such person or any of its Subsidiaries
(Restricted Subsidiaries, in the case of Doe Run), (c) any extraordinary,
unusual or nonrecurring gains or losses (and related tax effects) in accordance
with GAAP and (d) any compensation-related expenses arising as a result of the
application of the net proceeds from the issuance of the Notes. For purposes of
the "Limitation on Restricted Payments" covenant, the amortization of deferred
financing costs relating to the issuance of the Notes shall be excluded from
this definition of "Consolidated Net Income."
 
    "Consolidated Net Worth" means, with respect to any person at any date, the
sum of (i) the consolidated shareholder's equity of such person less the amount
of such shareholder's equity attributable to Disqualified Capital Stock of such
person and its Subsidiaries (Restricted Subsidiaries, in the case of Doe Run),
as determined on a consolidated basis in accordance with GAAP consistently
applied and (ii) the amount of any Preferred Stock of such person not included
in the shareholder's equity of such person in accordance with GAAP, which
Preferred Stock does not constitute Disqualified Capital Stock.
 
    "Default" means any event that is, or after notice or passage of time or
both would be, an Event of Default.
 
    "Disqualified Capital Stock" means any class of Capital Stock which, by its
terms (or by the terms of any security into which it is convertible or for which
it is exchangeable), or upon the happening of any event (other than a Change of
Control), matures or is mandatorily redeemable, pursuant to a sinking fund
obligation or otherwise, or is redeemable at the option of the holder thereof,
in whole or in part, on or prior to the Maturity Date.
 
    "Doe Run" means The Doe Run Resources Corporation, a New York corporation.
 
    "Doe Run Cayman" means Doe Run Cayman Ltd., a Cayman Islands company.
 
    "Doe Run Mining" means Doe Run Mining S.R. Ltda., a Peruvian company.
 
    "Doe Run Peru" means Doe Run Peru S.R. Ltda., a Peruvian company.
 
    "DRA" means DR Acquisition Corp., a Missouri corporation.
 
    "DR Exploration" means Doe Run Exploration SA (Proprietary) Limited, a South
African corporation.
 
    "Event of Default" has the meaning set forth under "--Events of Default"
herein.
 
    "Exchange Act" means the Securities Exchange Act of 1934, as amended.
 
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    "Fair Market Value" means, with respect to any asset, the price which could
be negotiated in an arm's-length free market transaction, for cash, between a
willing seller and a willing buyer, neither of whom is under undue pressure or
compulsion to complete the transaction. Fair Market Value of any asset of Doe
Run or the Restricted Subsidiaries shall be determined by the Board of Directors
of Doe Run acting in good faith and shall be evidenced by a Board Resolution
thereof delivered to the Trustee; PROVIDED that with respect to any Asset Sale
which involves in excess of $5 million, the Fair Market Value of any such asset
or assets shall be determined by an Independent Financial Advisor.
 
    "FPI" means Fabricated Products Inc., a Delaware corporation.
 
    "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as may be approved by a significant segment of the accounting
profession of the United States, which are in effect as of the Issue Date.
 
    "Guarantor" means each of FPI, Doe Run Cayman, Doe Run Mining, Doe Run Peru
and any Restricted Subsidiary that in the future executes a supplemental
indenture pursuant to the covenant entitled "Future Guarantees" or otherwise in
which any such Restricted Subsidiary agrees to be bound by the terms of the
Indenture; PROVIDED that any person constituting a Guarantor as described above
shall cease to constitute a Guarantor when its respective Guarantee is released
in accordance with the terms of the Indenture.
 
    "Hedging Agreement" shall mean any agreement with respect to (i) the hedging
of price risk associated with the purchase or sale of lead, copper, zinc, gold
and silver under which Doe Run or any Restricted Subsidiary is a party or
beneficiary and (ii) the hedging of currency risks in connection with funding
payroll expenses, so long as any such agreement has been entered into in the
ordinary course of business consistent with past price risk or currency
management practices of Doe Run and the Restricted Subsidiaries and not for
purposes of speculation.
 
    "Indebtedness" means with respect to any person, without duplication, (i)
all obligations of such person for borrowed money, (ii) all obligations of such
person evidenced by bonds, debentures, notes or other similar instruments, (iii)
all Capitalized Lease Obligations (but not obligations under Operating Leases)
of such person, (iv) all obligations of such person issued or assumed as the
deferred purchase price of property or services, all conditional sale
obligations and all obligations under any title retention agreement (but
excluding trade accounts payable, accrued expenses and deferred taxes arising in
the ordinary course of business), (v) all obligations of such person for the
reimbursement of any obligor on any letter of credit, banker's acceptance or
similar credit transaction entered into in the ordinary course of business, (vi)
all obligations of any other person of the type referred to in clauses (i)
through (v) which are secured by any Lien on any property or asset of such first
person and the amount of such obligation shall be the lesser of the value of
such property or asset or the amount of the obligation so secured, (vii) all
guarantees of Indebtedness by such person, (viii) Disqualified Capital Stock
valued at the greater of its voluntary or involuntary maximum fixed repurchase
price plus accrued and unpaid dividends, (ix) all obligations under interest
rate agreements or hedging agreements of such person and (x) any amendment,
supplement, modification, deferral, renewal, extension or refunding of any
liability of the types referred to in clauses (i) through (ix) above. For
purposes hereof, the "maximum fixed repurchase price" of any Disqualified
Capital Stock which does not have a fixed repurchase price shall be calculated
in accordance with the terms of such Disqualified Capital Stock as if such
Disqualified Capital Stock were purchased on any date on which Indebtedness
shall be required to be determined pursuant to the Indenture, and if such price
is based upon, or measured by, the Fair Market Value of such Disqualified
Capital Stock, such Fair Market Value to be determined in good faith by the
Board of Directors of the person issuing such Disqualified Capital Stock.
Notwithstanding anything to the contrary contained herein or in the Indenture,
any obligation of Doe Run or any Restricted Subsidiary in the form of an
earn-out arrangement
 
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undertaken in connection with any acquisition of property or assets by Doe Run
or such Restricted Subsidiary, which obligation shall be based upon increases in
metal prices above price levels existing on the date of such acquisition, shall
not constitute Indebtedness under the Indenture.
 
    "Independent Financial Advisor" means an accounting, appraisal or investment
banking firm of nationally recognized standing that is, in the reasonable and
good faith judgment of the Board of Directors of Doe Run, qualified to perform
the task for which such firm has been engaged and disinterested and independent
with respect to Doe Run and its Affiliates.
 
    "Interest Rate Protection Obligations" means the obligations of any person
pursuant to any arrangement with any other person, whereby, directly or
indirectly, such person is entitled to receive from time to time periodic
payments calculated by applying either a floating or a fixed rate of interest on
a stated notional amount in exchange for periodic payments made by such other
person calculated by applying a fixed or a floating rate of interest on the same
notional amount and shall include, without limitation, interest rate swaps,
caps, floors, collars and similar agreements.
 
    "Investment" means, with respect to any person, any direct or indirect
advance, loan, guarantee or other extension of credit or capital contribution to
(by means of any transfer of cash or other property to others or any payment for
property or services for the account or use of others or otherwise), or any
purchase or acquisition by such person of any Capital Stock, bonds, notes,
debentures or other securities or evidences of Indebtedness issued by, any other
person. Investments shall exclude extensions of trade credit on commercially
reasonable terms in accordance with normal trade practices. For the purposes of
the "Limitation on Restricted Payments" covenant, the amount of any Investment
(other than an Investment covered by clause (z) of the first paragraph thereof)
shall be the original cost of such Investment plus the cost of all additional
Investments by Doe Run or any of the Restricted Subsidiaries, without any
adjustments for increases or decreases in value, or write-ups, write-downs or
write-offs with respect to such Investment, reduced by the payment of dividends
or distributions in connection with such Investment or any other amounts
received in respect of such Investment.
 
    "Issue Date" means the date on which the Notes offered hereby are originally
issued under the Indenture.
 
    "Lien" means (x) any lien, mortgage, deed of trust, pledge, security
interest, charge or encumbrance of any kind including, without limitation, any
conditional sale or other title retention agreement, any lease in the nature
thereof, any option or other agreement to sell and any filing of or agreement to
file a financing statement as debtor under the Uniform Commercial Code or any
similar statute and (y) any agreement to enter into any of the foregoing.
 
    "Maturity Date" means (i) with respect to the Floating Rate Notes, March 15,
2003 and (ii) with respect to the Fixed Rate Notes, March 15, 2005.
 
    "Metaloroya" means Empresa Metalurgica La Oroya S.A., a Peruvian company,
prior to the merger of such entity with and into Doe Run Peru.
 
    "Net Cash Proceeds" means, with respect to any Asset Sale, the proceeds
thereof in the form of cash or Cash Equivalents including payments in respect of
deferred payment obligations when received in the form of cash or Cash
Equivalents (except to the extent that such obligations are financed or sold
with recourse to Doe Run or any Restricted Subsidiary) net of (i) brokerage
commissions and other fees and expenses (including fees and expenses of legal
counsel and investment bankers) related to such Asset Sale, (ii) provisions for
all taxes payable as a direct result of such Asset Sale and (iii) appropriate
amounts to be provided by Doe Run or any Restricted Subsidiary, as the case may
be, as a reserve required in accordance with GAAP consistently applied against
any liabilities associated with such Asset Sale and retained by Doe Run or any
Restricted Subsidiary, as the case may be, after such Asset Sale, including,
without limitation, pension and other post-employment benefit liabilities,
liabilities related to environmental matters and
 
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liabilities under any indemnification obligations associated with such Asset
Sale, all as reflected in an Officers' Certificate delivered to the Trustee.
 
    "Operating Lease" means, as applied to any person, any lease (including,
without limitation, leases that may be terminated by the lessee at any time) of
any property (whether real, personal or mixed) that is not a Capital Lease other
than any such lease under which that person is the lessor.
 
    "Permitted Holders" means Ira Leon Rennert and his Affiliates, estate, heirs
and legatees, and the legal representatives of any of the foregoing, including,
without limitation, the trustee of any trust of which one or more of the
foregoing are the sole beneficiaries.
 
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    "Permitted Indebtedness" means (i) any Indebtedness of Doe Run and the
Restricted Subsidiaries under (A) the U.S. Revolving Credit Facility in an
aggregate amount not to exceed $100.0 million in aggregate principal amount at
any time outstanding and (B) the Peruvian Revolving Credit Facility in an
aggregate principal amount not to exceed $60.0 million in aggregate principal
amount at any time outstanding, in each case plus any interest, fees and
expenses from time to time owed thereunder, (ii) the Notes issued in the Old
Notes Offering in an aggregate principal amount not to exceed $255.0 million and
the related Guarantees, (iii) any other Indebtedness of Doe Run and the
Restricted Subsidiaries outstanding on the Issue Date, (iv) purchase money
Indebtedness and any Indebtedness incurred for Capitalized Lease Obligations (A)
of Doe Run and the Restricted Subsidiaries (other than Doe Run Cayman and its
Subsidiaries) not to exceed $5.0 million in the aggregate at any time
outstanding and (B) of Doe Run Cayman and its Subsidiaries not to exceed $20.0
million in the aggregate at any time outstanding, (v) Interest Rate Protection
Obligations to the extent the notional principal amount of such Interest Rate
Protection Obligations does not exceed the principal amount of the Indebtedness
to which such Interest Rate Protection Obligations relate, and Hedging
Agreements, in each case entered into in the ordinary course of business, (vi)
additional Indebtedness of Doe Run and the Restricted Subsidiaries not to exceed
$25.0 million in the aggregate at any time outstanding, (vii) Indebtedness owed
by Doe Run or any of the Wholly-Owned Restricted Subsidiaries to Doe Run or any
Wholly-Owned Restricted Subsidiary; PROVIDED that this clause (vii) shall also
include Indebtedness indirectly between or among Doe Run and/or one or more of
the Wholly-Owned Restricted Subsidiaries through one or more financial
intermediaries, (viii) any renewals, extensions, substitutions, refundings,
refinancings or replacements of any Indebtedness described in the preceding
clauses (i), (ii) and (iii) above and this clause (viii), so long as such
renewal, extension, substitution, refunding, refinancing or replacement does not
result in an increase in the aggregate principal amount of the outstanding
Indebtedness represented thereby (except if such Indebtedness refinances
Indebtedness under the Revolving Credit Facilities or any other agreement
providing for subsequent borrowings, does not result in an increase in the
commitment available under the Revolving Credit Facilities or such other
agreement), and (ix) any guarantees of the foregoing.
 
    "Permitted Investment" means (i) cash and Cash Equivalents, (ii) any
Investment by Doe Run or any of the Restricted Subsidiaries in Doe Run or any
Wholly-Owned Restricted Subsidiary; PROVIDED that this clause (ii) shall also
include indirect Investments by Doe Run and the Wholly-Owned Restricted
Subsidiaries in Doe Run or one or more of the Wholly-Owned Restricted
Subsidiaries through one or more financial intermediaries, (iii) Related
Business Investments by Doe Run or any of the Restricted Subsidiaries in joint
ventures, partnerships or persons (including Unrestricted Subsidiaries) that are
not Wholly-Owned Restricted Subsidiaries in an amount not to exceed $25.0
million in the aggregate at any one time outstanding, (iv) Investments by Doe
Run or any Restricted Subsidiary in another person, if as a result of such
Investment (a) such other person becomes a Wholly-Owned Restricted Subsidiary or
(b) such other person is merged or consolidated with or into, or transfers or
conveys all or substantially all of its assets to, Doe Run or a Wholly-Owned
Restricted Subsidiary, (v) Investments received in connection with the
bankruptcy or reorganization of suppliers and customers and in settlement of
delinquent obligations of, and other disputes with, customers and suppliers, in
each case arising in the ordinary course of business, (vi) the non-cash proceeds
of any Asset Sale, (vii) Investments under or pursuant to Interest Rate
Protection Obligations or Hedging Agreements, in each case in the ordinary
course of business, (viii) loans and advances to employees of Doe Run and the
Restricted Subsidiaries made in the ordinary course of business and (ix)
Investments represented by the Qualifying Investments Promissory Notes.
 
    "Permitted Liens" means (i) pledges or deposits by such person under
worker's compensation laws, unemployment insurance laws or similar legislation,
or good faith deposits in connection with bids, tenders, contracts (other than
for the payment of Indebtedness) or leases to which such person is a party, or
deposits to secure public statutory obligations of such person or deposits to
secure surety or appeal bonds to which such person is a party, or deposits as
security for contested taxes or import duties or for the payment of rent, (ii)
Liens imposed by law, such as landlords', carriers', warehousemen's and
mechanics' Liens or bankers' Liens incurred in the ordinary course of business
for sums which are not yet due or are
 
                                      132
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being contested in good faith and for which adequate provision has been made,
(iii) Liens for taxes not yet subject to penalties for non-payment or which are
being contested in good faith and by appropriate proceedings, if adequate
reserve, as may be required by GAAP, shall have been made therefor, (iv) Liens
in favor of issuers of surety bonds or appeal bonds issued pursuant to the
request of and for the account of such person in the ordinary course of its
business, (v) Liens to support trade letters of credit issued in the ordinary
course of business, (vi) survey exceptions, encumbrances, easements or
reservations of, or rights of others for, rights of way, sewers, electric lines,
telegraph and telephone lines and other similar purposes, or zoning or other
restrictions on the use of real property, (vii) Liens securing Indebtedness
permitted under clause (iv) of the definition of Permitted Indebtedness;
PROVIDED that the Fair Market Value of the asset at the time of the incurrence
of the Indebtedness subject to the Lien shall not exceed the principal amount of
the Indebtedness secured, (viii) Liens with respect to Acquired Indebtedness
permitted to be incurred in accordance with the provisions of "--Certain
Covenants--Limitation on Indebtedness" above; PROVIDED that such Liens secured
such Acquired Indebtedness at the time of the incurrence of such Acquired
Indebtedness by Doe Run or any of the Restricted Subsidiaries and were not
incurred in connection with, or in anticipation of, the incurrence of such
Acquired Indebtedness by Doe Run or any of the Restricted Subsidiaries;
PROVIDED, FURTHER, that such Liens do not extend to or cover any property or
assets of Doe Run or any of the Restricted Subsidiaries other than the property
or assets that secured the Acquired Indebtedness prior to the time such
Indebtedness became Acquired Indebtedness of Doe Run or any of the Restricted
Subsidiaries and are no more favorable to the lienholders than those securing
the Acquired Indebtedness prior to the incurrence of such Acquired Indebtedness
by Doe Run or any of the Restricted Subsidiaries, (ix) Liens arising from
judgments, decrees or attachments in circumstances not constituting an Event of
Default, (x) Liens on assets or property (including any real property upon which
such assets or property are or will be located) securing Indebtedness incurred
to purchase or construct such assets or property, which Indebtedness is
permitted to be incurred under the Indenture, (xi) Liens securing Indebtedness
which is incurred to refinance or replace Indebtedness which has been secured by
a Lien permitted under the Indenture and is permitted to be refinanced or
replaced under the Indenture, PROVIDED that such Liens do not extend to or cover
any property or assets of Doe Run or any of the Restricted Subsidiaries not
securing the Indebtedness so refinanced or replaced, and (xii) Liens securing
reimbursement obligations under letters of credit but only in or upon the goods
the purchase of which was financed by such letters of credit.
 
    "person" means any individual, corporation, partnership, joint venture,
trust, estate, unincorporated organization or government or any agency or
political subdivision thereof or any similar entities.
 
    "Peruvian Revolving Credit Facility" means one or more working capital
facilities or other working capital financings or programs entered into by Doe
Run Peru and its Subsidiaries from time to time as the same may be amended,
restated, supplemented or otherwise modified from time to time, and includes any
agreement renewing, refinancing or replacement of all or any portion of the
Indebtedness under such agreement.
 
    "Plan of Liquidation" means, with respect to any person, a plan that
provides for, contemplates or the effectuation of which is preceded or
accompanied by (whether or not substantially contemporaneously, in phases or
otherwise) (i) the sale, lease, conveyance or other disposition of all or
substantially all of the assets of such person otherwise than as an entirety or
substantially as an entirety and (ii) the distribution of all or substantially
all of the proceeds of such sale, lease, conveyance or other disposition and all
or substantially all of the remaining assets of such person to holders of
Capital Stock of such person.
 
    "Preferred Stock" means, with respect to any person, any and all shares,
interests, participation or other equivalents (however designated) of such
person's preferred or preference stock, whether outstanding on the Issue Date or
issued thereafter, and including, without limitation, all classes and series of
preferred or preference stock of such person.
 
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    "pro forma" means, with respect to any calculation made or required to be
made pursuant to the terms of the Indenture, a calculation in accordance with
Article 11 of Regulation S-X under the Exchange Act.
 
    "Qualified Capital Stock" means, with respect to any person, any Capital
Stock of such person that is not Disqualified Capital Stock or convertible into
or exchangeable or exercisable for Disqualified Capital Stock.
 
    "Qualifying Auditors" shall mean the firm of independent auditors of
acknowledged international prestige elected annually by Centromin in accordance
with Section 4.2 of the Subscription Agreement.
 
    "Qualifying Investment" shall mean investments that meet the qualifications
of Section 4.5 of the Subscription Agreement, as determined in good faith by the
Qualifying Auditors.
 
    "Qualifying Investments Promissory Notes" shall have the meaning given to
such term under the caption "Certain Covenants--Qualifying Investment
Requirements."
 
    "Related Business Investment" means any Investment, Capital Expenditure or
other expenditure by Doe Run or any Restricted Subsidiary which is related to
the business of Doe Run and the Restricted Subsidiaries as it is conducted on
the Issue Date or any business which is the same, similar or reasonably related
to such business.
 
    "Renco" means The Renco Group, Inc., a New York corporation, which is the
ultimate parent of Doe Run, or any successor thereto.
 
    "Restricted Subsidiary" means any Subsidiary of Doe Run which at the time of
determination is not an Unrestricted Subsidiary. The Board of Directors of Doe
Run may designate any Unrestricted Subsidiary to be a Restricted Subsidiary only
if, immediately after giving effect to such designation, Doe Run and the
Guarantors could incur at least $1.00 of additional Indebtedness (other than
Permitted Indebtedness) pursuant to the "Limitation on Indebtedness" covenant,
on a pro forma basis taking into account such designation.
 
    "Revolving Credit Facilities" means the U.S. Revolving Credit Facility and
the Peruvian Revolving Credit Facility.
 
    "Sale/leaseback" means any lease, whether an Operating Lease or a Capital
Lease, whereby Doe Run or any of the Restricted Subsidiaries, directly or
indirectly, becomes or remains liable as lessee or as guarantor or other surety,
of any property (whether real or personal or mixed) whether now owned or
hereafter acquired, (i) that Doe Run or the Restricted Subsidiaries, as the case
may be, has sold or transferred or is to sell or transfer to any other person
(other than Doe Run or any Restricted Subsidiary), or (ii) that Doe Run or any
of the Restricted Subsidiaries, as the case may be, intends to use for
substantially the same purpose as any other property that has been or is to be
sold or transferred by Doe Run or any such Restricted Subsidiary to any person
(other than Doe Run or any Restricted Subsidiary) in connection with such lease.
 
    "Significant Subsidiary" means any Restricted Subsidiary that satisfies the
criteria for a "significant subsidiary" set forth in Rule 1.02(w) of Regulation
S-X under the Exchange Act.
 
    "Subsidiary" of any person means (i) any corporation of which the
outstanding capital stock having at least a majority of the votes entitled to be
cast in the election of directors under ordinary circumstances shall at the time
be owned, directly or indirectly, by such person or (ii) any other person of
which at least a majority of the voting interest under ordinary circumstances is
at the time owned, directly or indirectly, by such person. For purposes of this
definition, any directors' qualifying shares or investments by foreign nationals
mandated by applicable law shall be disregarded in determining the ownership of
a Subsidiary.
 
    "Unrestricted Subsidiary" means (i) any Subsidiary of Doe Run which at the
time of determination is an Unrestricted Subsidiary (as designated by the Board
of Directors of Doe Run, as provided below) and
 
                                      134
<PAGE>
(ii) any Subsidiary of an Unrestricted Subsidiary. The Board of Directors of Doe
Run may designate any Subsidiary of Doe Run (including any newly acquired or
newly formed Subsidiary) to be an Unrestricted Subsidiary, unless such
Subsidiary owns any Capital Stock of, or owns, or holds any Lien on, any
property of, any Restricted Subsidiary of Doe Run which is not a Subsidiary of
the Subsidiary to be so designated; PROVIDED that (a) Doe Run certifies that
such designation complies with the "Limitation on Restricted Payments" covenant
and (b) each Subsidiary to be so designated and each of its Subsidiaries has not
at the time of designation, and does not thereafter, create, incur, issue,
assume, guarantee or otherwise become directly or indirectly liable with respect
to any Indebtedness pursuant to which the lender has recourse to any of the
assets of Doe Run or any of the Restricted Subsidiaries. The Board of Directors
of Doe Run may designate any Unrestricted Subsidiary to be a Restricted
Subsidiary only if, immediately after giving effect to such designation, Doe Run
and the Guarantors could incur at least $1.00 of additional Indebtedness (other
than Permitted Indebtedness) pursuant to the "Limitation on Indebtedness"
covenant, on a pro forma basis taking into account such designation.
 
    "U.S. Revolving Credit Facility" means the Loan and Security Agreement dated
as of the Issue Date, among Doe Run, FPI, and Congress Financial Corporation, as
Lender, as the same may be amended, restated, supplemented or otherwise modified
from time to time, and includes any agreement renewing, refinancing or
replacement of all or any portion of the Indebtedness under such agreement.
 
    "Wholly-Owned Restricted Subsidiary" means any Restricted Subsidiary which
is a Wholly-Owned Subsidiary of Doe Run.
 
    "Wholly-Owned Subsidiary" means any Subsidiary of such person to the extent
all of the Capital Stock or other ownership interests in such Subsidiary (other
than (x) directors' qualifying shares, (y) with respect to Doe Run Peru, any
shares purchased by employees of Doe Run Peru or Centromin in connection with
the Acquisition, which retained amount shall not exceed 1% of the total
interests in Doe Run Peru, and (z) an immaterial interest owned by other persons
solely to comply with applicable law) is owned directly or indirectly by such
person or a Wholly-Owned Subsidiary of such person.
 
                                      135
<PAGE>
                 CERTAIN U.S. FEDERAL INCOME TAX CONSIDERATIONS
 
    The following summary is based on the tax laws of the United States in
effect on the date of this Prospectus, as well as judicial and administrative
interpretations thereof (in final or proposed form) available on or before such
date. The foregoing laws and interpretations thereof are subject to change,
which could apply retroactively.
 
    The exchange of Old Notes for Exchange Notes pursuant to the Exchange Offer
will not be a taxable event for federal income tax purposes. A holder's holding
period for Exchange Notes will include the holding period for Old Notes. HOLDERS
SHOULD CONSULT THEIR TAX ADVISORS WITH RESPECT TO THE FEDERAL, STATE, LOCAL AND
FOREIGN TAX CONSEQUENCES OF EXCHANGING OLD NOTES FOR EXCHANGE NOTES.
 
                              PLAN OF DISTRIBUTION
 
    A broker-dealer that is the holder of Old Notes that were acquired for the
account of such broker-dealer as a result of market-making or other trading
activities (other than Old Notes acquired directly from Doe Run or any affiliate
of Doe Run) may exchange such Old Notes for Exchange Notes pursuant to the
Exchange Offer; provided, that each broker-dealer that receives Exchange Notes
for its own account in exchange for Old Notes, where such Old Notes were
acquired by such broker-dealer as a result of market-making or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of such Exchange Notes. This Prospectus, as it may be amended or
supplemented from time to time, may be used by a broker-dealer in connection
with resales of Exchange Notes received in exchange for Old Notes where such Old
Notes were acquired as a result of market-making activities or other trading
activities. Doe Run has agreed that for a period of 180 days after consummation
of the Exchange Offer, it will make this Prospectus, which Doe Run will update,
amend or supplement from time to time as required by applicable law or
regulations, available to any broker-dealer for use in connection with any such
resale. In addition, until       , 1998, all dealers effecting transactions in
the Exchange Notes may be required to deliver a prospectus.
 
    Doe Run will not receive any proceeds from any sale of Exchange Notes by
broker-dealers or any other holder of Exchange Notes. Exchange Notes received by
broker-dealers for their own account pursuant to the Exchange Offer may be sold
from time to time in one or more transactions in the over-the-counter market, in
negotiated transactions, through the writing of options on the Exchange Notes or
a combination of such methods of resale, at market prices prevailing at the time
of resale, at prices related to such prevailing market prices or negotiated
prices. Any such resale may be made directly to purchasers or to or through
brokers or dealers who may receive compensation in the form of commissions or
concessions from any such broker-dealer and/or the purchasers of any such
Exchange Notes. Any broker-dealer that resells Exchange Notes that were received
by it for its own account pursuant to the Exchange Offer and any broker or
dealer that participates in a distribution of such Exchange Notes may be deemed
to be an "underwriter" within the meaning of the Securities Act and any profit
on any such resale of Exchange Notes and any commissions or concessions received
by any such persons may be deemed to be underwriting compensation under the
Securities Act. The Letter of Transmittal states that by acknowledging that it
will deliver and by delivering a prospectus, a broker-dealer will not be deemed
to admit that it is an "underwriter" within the meaning of the Securities Act.
 
    For a period of 180 days after consummation of the Exchange Offer, Doe Run
will promptly send additional copies of this Prospectus and any amendment or
supplement to this Prospectus to any broker-dealer that requests such documents
in the Letter of Transmittal. Doe Run has agreed to pay all expenses incident to
the Exchange Offer and to Doe Run's performance of, or compliance with, the
Registration Rights Agreement (other than commissions or concessions of any
brokers or dealers) and will indemnify the holders of the Notes (including any
broker-dealers) against certain liabilities, including liabilities under the
Securities Act.
 
                                      136
<PAGE>
                                 LEGAL MATTERS
 
    Certain legal matters related to the Exchange Notes being offered hereby are
being passed upon for Doe Run and the Guarantors by Cadwalader, Wickersham &
Taft, New York, New York.
 
                                    EXPERTS
 
    The audited consolidated financial statements of the Company as of October
31, 1996 and 1997 and for each of the years in the three year period ended
October 31, 1997 have been included herein and in the Registration Statement in
reliance upon the report of KPMG Peat Marwick LLP and Medina, Zaldivar y
Asociados S. Civ. R.L., a member firm of Andersen Worldwide SC, independent
certified public accountants, appearing elsewhere herein, and upon the authority
of said firms as experts in accounting and auditing.
 
    The audited consolidated financial statements of Doe Run Peru's Predecessor
as of December 31, 1994, 1995 and 1996 and October 23, 1997 and for each of the
three year periods ended December 31, 1996 and the period January 1, 1997 to
October 23, 1997, and of Doe Run Peru as of October 31, 1997, and included
herein have been audited by Medina, Zaldivar y Asociados S. Civ. R.L., a member
firm of Andersen Worldwide SC, independent certified public accountants, as
stated in their reports with respect thereto and upon the authority of said firm
as experts in accounting and auditing.
 
    The financial statements of the Missouri Lead Division as of December 31,
1996 and 1997 and for each of the years in the three year period ended December
31, 1997 which have been included herein and in the Registration Statement have
been audited by PricewaterhouseCoopers LLP. With respect to the unaudited
interim financial information of the Missouri Lead Division for the periods
ended March 31, 1998 and 1997, included in this Registration Statement, the
independent accountants have reported that they have applied limited procedures
in accordance with professional standards for a review of such information.
However, their separate report included herein, states that they did not audit
and do not express an opinion on that interim financial information.
Accordingly, the degree of reliance on their report on such information should
be restricted in light of the limited nature of the review procedures applied.
The independent accountants are not subject to the liability provisions of
Section 11 of the Securities Act of 1933, as amended (the "Act") for their
report on the unaudited interim financial information because that report is not
a "report" or a "part" of the registration statement prepared or certified by
the accountants within the meaning of Sections 7 and 11 of the Act.
 
                                      137
<PAGE>
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
   
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
                                     THE DOE RUN RESOURCES CORPORATION
Independent Auditors' Report...............................................................................        F-2
Report of Independent Public Accountants...................................................................        F-3
Consolidated Balance Sheets as of October 31, 1996 and 1997 and unaudited as of April 30, 1998.............        F-4
Consolidated Statements of Operations and Shareholders' Equity for the years ended October 31, 1995, 1996,
  1997 and unaudited for the six months ended April 30, 1997 and 1998......................................        F-5
Consolidated Statements of Cash Flows for the years ended October 31, 1995, 1996, 1997 and unaudited for
  the six months ended April 30, 1997 and 1998.............................................................        F-6
Notes to Consolidated Financial Statements.................................................................        F-7
                                          DOE RUN PERU S.R. LTDA.
Report of Independent Public Accountants...................................................................       F-36
Consolidated Balance Sheet as of October 31, 1997..........................................................       F-37
Consolidated Statement of Income for the period from October 23, 1997 (Inception Date) to October 31,
  1997.....................................................................................................       F-38
Consolidated Statement of Changes in Shareholders' Equity for the period from October 23, 1997 (Inception
  Date) to October 31, 1997................................................................................       F-39
Consolidated Statement of Cash Flows for the period from October 23, 1997 (Inception Date) to October 31,
  1997.....................................................................................................       F-40
Notes to the Consolidated Financial Statements.............................................................       F-41
Consolidated Balance Sheet unaudited as of April 30, 1998..................................................       F-48
Consolidated Statement of Income unaudited for the six months ended April 30, 1997 and 1998................       F-49
Consolidated Statement of Cash Flows unaudited for the six months ended April 30, 1997 and 1998............       F-50
Notes to the Consolidated Financial Statements.............................................................       F-51
              EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A., LA OROYA DIVISION
Report of Independent Public Accountants...................................................................       F-52
Statements of Assets and Liabilities as of December 31, 1995 and 1996 and October 23, 1997.................       F-53
Statements of Revenues and Expenses for the years ended December 31, 1994, 1995, 1996 and the period
  January 1 to October 23, 1997............................................................................       F-54
Statements of Changes in Net Assets for the years ended December 31, 1994, 1995, 1996 and the period
  January 1 to October 23, 1997............................................................................       F-55
Statements of Cash Flows for the years ended December 31, 1994, 1995, 1996 and the period January 1 to
  October 23, 1997.........................................................................................       F-56
Notes to Financial Statements..............................................................................       F-57
                                ASARCO INCORPORATED--MISSOURI LEAD DIVISION
Report of Independent Accountants..........................................................................       F-70
Statements of Operations for the years ended December 31, 1995, 1996 and 1997..............................       F-71
Balance Sheets as of December 31, 1996 and 1997............................................................       F-72
Statement of Cash Flows for the years ended December 31, 1995, 1996 and 1997...............................       F-73
Statement of Changes in Divisional Equity for years ended December 31, 1995, 1996 and 1997.................       F-74
Notes to Financial Statements..............................................................................       F-75
Report of Independent Accountants..........................................................................       F-81
Condensed Statements of Operations for the three months ended March 31, 1997 and 1998......................       F-82
Condensed Balance Sheets as of March 31, 1997 and 1998.....................................................       F-83
Condensed Statements of Cash Flows for the three months ended March 31, 1996 and 1997......................       F-84
Notes to Condensed Financial Statements....................................................................       F-85
</TABLE>
    
 
                                      F-1
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
The Board of Directors
The Doe Run Resources Corporation and Subsidiaries:
 
    We have audited the accompanying consolidated balance sheets of The Doe Run
Resources Corporation and subsidiaries as of October 31, 1996 and 1997, and the
related consolidated statements of operations, shareholders' equity, and cash
flows for each of the years in the three-year period ended October 31, 1997.
These consolidated financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these consolidated
financial statements based on our audits. We did not audit the consolidated
financial statements of Doe Run Cayman Ltd., a wholly-owned subsidiary, which
statements reflect total assets constituting 45% and total revenues constituting
1% in 1997, of the related consolidated totals. Those consolidated statements
were audited by other auditors whose report has been furnished to us, and our
opinion, insofar as it relates to the amounts included for Doe Run Cayman Ltd.
and its subsidiaries, is based solely on the reports of the other auditors.
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits and the reports of the other auditors provide a
reasonable basis for our opinion.
 
    In our opinion, based on our audits and the report of the other auditors,
the consolidated financial statements referred to above present fairly, in all
material respects, the financial position of The Doe Run Resources Corporation
and subsidiaries as of October 31, 1996 and 1997, and the results of their
operations and their cash flows for each of the years in the three-year period
ended October 31, 1997, in conformity with generally accepted accounting
principles.
 
                                          KPMG PEAT MARWICK LLP
 
December 19, 1997, except for
 
    note 15 as to which the date is
 
    March 12, 1998
 
                                      F-2
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Shareholder of
Doe Run Cayman Ltd.:
 
    We have audited the accompanying consolidated balance sheet of Doe Run
Cayman Ltd. (a company incorporated in Cayman Islands) as of October 31, 1997
and the related consolidated statements of operations, changes in shareholder's
equity and cash flows for the period from October 23, 1997 (inception date) to
October 31, 1997. These consolidated financial statements are the responsibility
of the Company's management. Our responsibility is to express an opinion on
these consolidated financial statements based on our audit.
 
    We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statements presentation.
We believe that our audit provides a reasonable basis for our opinion.
 
    In our opinion, the consolidated financial statements referred to above,
present fairly, in all material respects, the consolidated financial position of
Doe Run Cayman Ltd. as of October 31, 1997, and its consolidated results of
operations and cash flows for the period from October 23, 1997 (inception date)
to October 31, 1997, in conformity with accounting principles generally accepted
in the United States of America.
 
                                          MEDINA, ZALDIVAR Y ASOCIADOS
 
                                          a member firm of Andersen Worldwide SC
 
Countersigned by:
 
Marco Antonio Zaldivar
C.P.C. Register 12477
Lima, Peru
December 5, 1997
 
                                      F-3
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
                          CONSOLIDATED BALANCE SHEETS
 
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<TABLE>
<CAPTION>
                                                                                 AS OF OCTOBER 31,
                                                                               ----------------------
                                                                                  1996        1997
                                                                               ----------  ----------     AS OF
                                                                                                        APRIL 30,
                                                                                                          1998
                                                                                                       -----------
                                                                                                       (UNAUDITED)
<S>                                                                            <C>         <C>         <C>
                                               ASSETS
Current assets:
  Cash.......................................................................      --      $    8,943   $  12,142
  Trade accounts receivable, net of allowance for doubtful accounts of $947,
    $729 and $741 at October 31, 1996 and 1997 and April 30, 1998,
    respectively.............................................................  $   54,493      52,470      66,927
  Inventories................................................................      30,019      88,648     100,867
  Prepaid expenses and other current assets..................................       2,919       5,263      29,543
  Net deferred tax assets....................................................       3,792          69      --
                                                                               ----------  ----------  -----------
    Total current assets.....................................................      91,223     155,393     209,479
Property, plant and equipment, net...........................................     104,162     206,348     205,867
Special term deposit.........................................................      --          --         125,000
Net deferred tax assets......................................................      --           7,481       9,145
Other noncurrent assets, net.................................................       8,529      15,218      17,387
                                                                               ----------  ----------  -----------
    Total assets.............................................................  $  203,914  $  384,440   $ 566,878
                                                                               ----------  ----------  -----------
                                                                               ----------  ----------  -----------
 
<CAPTION>
 
                                LIABILITIES AND SHAREHOLDERS' EQUITY
<S>                                                                            <C>         <C>         <C>
Current liabilities:
  Current maturities of long-term debt.......................................  $   16,590  $   12,345   $   5,895
  Accounts payable...........................................................      16,324      41,086      50,725
  Accrued liabilities........................................................      24,320      28,893      42,783
  Net deferred tax liabilities...............................................      --           7,481       9,467
                                                                               ----------  ----------  -----------
    Total current liabilities................................................      57,234      89,805     108,870
Long-term debt, less current maturities......................................      66,201     222,395     384,681
Net deferred tax liabilities.................................................       3,792      --          --
Postretirement benefits......................................................      12,817      12,455      12,608
Reclamation and environmental costs..........................................      26,773      31,685      31,085
Other noncurrent liabilities.................................................      16,267      13,926      13,758
                                                                               ----------  ----------  -----------
    Total liabilities........................................................     183,084     370,266     551,002
 
Shareholders' equity:
  Preferred stock, $1,000 par value, 2,500 shares issued, authorized and
    outstanding; liquidation and redemption value of $2,668 and $2,618 on
    October 31, 1996 and 1997, respectively..................................       2,500       2,500      --
  Common stock, $.10 par value, 1,000 shares authorized, issued, and
    outstanding..............................................................      --          --          --
  Additional paid in capital.................................................       5,000       5,000       5,000
  Retained earnings..........................................................      13,330       6,674      10,876
                                                                               ----------  ----------  -----------
    Total shareholders' equity...............................................      20,830      14,174      15,876
                                                                               ----------  ----------  -----------
    Total liabilities and shareholders' equity...............................  $  203,914  $  384,440   $ 566,878
                                                                               ----------  ----------  -----------
                                                                               ----------  ----------  -----------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-4
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
         CONSOLIDATED STATEMENTS OF OPERATIONS AND SHAREHOLDERS' EQUITY
 
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                              SIX MONTHS ENDED
                                                             YEAR ENDED OCTOBER 31,              APRIL 30,
                                                       ----------------------------------  ----------------------
                                                          1995        1996        1997        1997        1998
                                                       ----------  ----------  ----------  ----------  ----------
<S>                                                    <C>         <C>         <C>         <C>         <C>
                                                                                                (UNAUDITED)
Net sales............................................  $  225,143  $  274,930  $  280,467  $  135,905  $  343,405
Costs and expenses:
  Cost of sales......................................     180,398     215,489     234,351     108,478     283,105
  Depletion, depreciation and amortization...........      12,486      13,654      14,718       7,323      11,461
  Selling, general and administrative expenses,
    including related party management fees of $1,200
    per year.........................................       8,405      10,079      10,959       5,804      17,700
  Exploration expense................................       1,926       2,912       2,705       1,365       1,599
                                                       ----------  ----------  ----------  ----------  ----------
    Total costs and expenses.........................     203,215     242,134     262,733     122,970     313,865
                                                       ----------  ----------  ----------  ----------  ----------
    Income from operations...........................      21,928      32,796      17,734      12,935      29,540
Other income (expense):
  Interest expense...................................     (14,361)    (14,348)    (13,740)     (7,568)    (14,505)
  Interest income....................................         140         113          21           2       2,359
  Other, net.........................................        (132)        355         (37)          6        (635)
                                                       ----------  ----------  ----------  ----------  ----------
                                                          (14,353)    (13,880)    (13,756)     (7,560)    (12,781)
                                                       ----------  ----------  ----------  ----------  ----------
    Income before income tax expense and
      extraordinary item.............................       7,575      18,916       3,978       5,375      16,759
 
Income tax expense...................................       3,252       6,451       4,331       1,826       5,761
                                                       ----------  ----------  ----------  ----------  ----------
    Net income (loss) before extraordinary item......       4,323      12,465        (353)      3,549      10,998
 
Extraordinary item related to early retirement of
  debt, net of income tax benefit....................      --          --          (1,062)       (314)     (6,607)
                                                       ----------  ----------  ----------  ----------  ----------
    Net income (loss)................................  $    4,323  $   12,465  $   (1,415) $    3,235  $    4,391
                                                                                           ----------
                                                                                           ----------
 
  Shareholders' equity, beginning of year............       5,995      10,318      20,830                  14,174
  Less dividends declared and paid:
    Preferred stock--$140, $100 and $76 per share,
      respectively...................................      --            (350)       (250)                   (189)
    Redemption of preferred stock....................                                                      (2,500)
    Common stock--$1,603 and $4,991 per share,
      respectively...................................      --          (1,603)     (4,991)                 --
                                                       ----------  ----------  ----------              ----------
  Shareholders' equity, end of year..................  $   10,318  $   20,830  $   14,174              $   15,876
                                                       ----------  ----------  ----------              ----------
                                                       ----------  ----------  ----------              ----------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-5
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                          SIX MONTHS ENDED
                                                                         YEAR ENDED OCTOBER 31,              APRIL 30,
                                                                    ---------------------------------  ----------------------
                                                                      1995       1996        1997        1997        1998
                                                                    ---------  ---------  -----------  ---------  -----------
<S>                                                                 <C>        <C>        <C>          <C>        <C>
                                                                                                            (UNAUDITED)
Cash flows from operating activities:
  Net income (loss)...............................................  $   4,323  $  12,465  $    (1,415) $   3,235  $     4,391
  Extraordinary item related to retirement of debt................     --         --            1,327        392        6,750
  Adjustments to reconcile net income to net cash provided by
    operating activities:
    Depreciation, depletion and amortization......................     12,486     13,654       14,718      7,323       11,461
    Amortization of deferred financing fees.......................      1,140        898          257        132          844
    Imputed interest..............................................      7,132      6,617        5,635      3,025           15
    Increase (decrease) resulting from changes in assets and
      liabilities, net of effects of business acquisitions:
      Trade accounts receivable...................................     (5,641)   (10,291)       2,023      3,276      (14,457)
      Inventories.................................................        665      3,209       (3,062)    (8,602)     (12,219)
      Prepaid expenses and other current assets...................       (994)      (339)      (1,201)       287      (24,280)
      Accounts payable............................................      2,028        771        6,636     (1,275)       9,639
      Accrued liabilities.........................................      3,955      1,492       (1,939)    (3,524)      14,857
      Other noncurrent assets and liabilities, net................     (5,028)      (526)      (4,959)    (1,739)       1,256
                                                                    ---------  ---------  -----------  ---------  -----------
        Net cash provided by (used in) operating activities.......     20,066     27,950       18,020      2,530       (1,743)
 
Cash flows from investing activities:
  Special term deposit............................................     --         --          --          --         (125,000)
  Purchases of property, plant and equipment......................     (5,377)   (10,534)     (13,476)    (4,145)     (10,908)
  Payments for acquisitions.......................................     --         (1,742)    (128,242)    --          --
                                                                    ---------  ---------  -----------  ---------  -----------
        Net cash used in investing activities.....................     (5,377)   (12,276)    (141,718)    (4,145)    (135,908)
 
Cash flows from financing activities:
  Proceeds from (payments on) revolving loan, net.................     (5,139)     1,044       (6,399)    18,511        1,681
  Proceeds from short-term borrowings.............................     --         --          --          --            5,000
  Proceeds from long-term debt....................................     --         --          365,945     10,945      380,000
  Payments on long-term debt......................................     (9,550)   (14,765)    (212,453)   (24,436)    (230,845)
  Payment of deferred financing costs.............................     --         --           (8,573)      (164)     (12,297)
  Extraordinary item related to retirement of debt................     --         --             (638)    --          --
  Payment of dividends............................................     --         (1,953)      (5,241)    (3,241)        (189)
  Redemption of preferred stock...................................     --         --          --          --           (2,500)
                                                                    ---------  ---------  -----------  ---------  -----------
        Net cash provided by (used in) financing activities.......    (14,689)   (15,674)     132,641      1,615      140,850
                                                                    ---------  ---------  -----------  ---------  -----------
        Net increase in cash......................................     --         --            8,943     --            3,199
 
Cash at beginning of period.......................................     --         --          --          --            8,943
                                                                    ---------  ---------  -----------  ---------  -----------
Cash at end of period.............................................  $  --      $  --      $     8,943  $  --      $    12,142
                                                                    ---------  ---------  -----------  ---------  -----------
                                                                    ---------  ---------  -----------  ---------  -----------
Supplemental disclosure of cash flow information--
  Cash paid during the period for:
 
    Interest, net of capitalized interest.........................  $   6,850  $   6,575  $     9,196  $   6,038  $     8,685
                                                                    ---------  ---------  -----------  ---------  -----------
                                                                    ---------  ---------  -----------  ---------  -----------
    Income taxes..................................................  $  --      $   6,787  $     3,480  $   1,617  $     7,028
                                                                    ---------  ---------  -----------  ---------  -----------
                                                                    ---------  ---------  -----------  ---------  -----------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-6
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
                             (DOLLARS IN THOUSANDS)
 
(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    PRINCIPLES OF CONSOLIDATION
 
    These consolidated financial statements include the accounts of The Doe Run
Resources Corporation and its wholly owned subsidiaries (the "Company"). All
material intercompany balances and transactions have been eliminated.
 
    NATURE OF BUSINESS
 
    The principal domestic business of the Company is the exploration,
development, mining and processing of base metals, primarily lead, and recycling
of lead-acid batteries and other lead-bearing materials. The Company's
fabrication businesses fabricate lead products used in radiation and X-ray
shielding, pollution control devices, and medical equipment, produce lead oxide
for use in automotive batteries, and fabricate and repair lead-lined process
equipment. In Peru, the Company is engaged in the smelting and refining of
polymetallic concentrates, mainly copper, lead and zinc, which are sold as
refined metals primarily to customers located outside of Peru.
 
    FOREIGN CURRENCY TRANSLATION
 
    The functional currency of the Company's foreign subsidiaries is the U.S.
Dollar. Accordingly, translation gains and losses are included in determining
net income.
 
    USE OF ESTIMATES
 
    The preparation of consolidated financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities, the
disclosure of contingent assets and liabilities at the date of the consolidated
financial statements, and the reported amounts of revenues and expenses during
the reporting periods. Actual results could differ from these estimates.
 
    CASH
 
    All of the Company's domestic accounts are zero balance accounts. Checks
cleared on domestic bank accounts are funded by advances drawn on revolving
loans. Cash received from domestic operations is transferred to the Company's
primary lender daily and applied to outstanding revolving loans, if any.
 
    INVENTORIES
 
    Finished metals and concentrates, metals and concentrates in process, and
raw materials are stated at the lower of cost or market. The last-in, first-out
("LIFO") method of determining cost is used for the majority of the Company's
U.S. inventories. Inventory costs of the Company's foreign subsidiaries are
determined using the first-in, first-out ("FIFO") method. Inventory costs
include labor, material and other production costs. Supplies and repair parts
are principally stated at average cost, net of reserves for obsolescence.
 
                                      F-7
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    PROPERTY, PLANT AND EQUIPMENT
 
    Property, plant and equipment are recorded at cost. Major additions and
improvements to property, plant and equipment are capitalized, at cost, when
they significantly increase the productive capacity or the life of the asset.
 
    Routine or unanticipated repair and maintenance expenditures, which do not
extend the useful life or increase the productive capacity of the asset, are
charged to operations as incurred. Major expenditures required to maintain the
originally anticipated productive capacity and life of the asset (such as
furnace rebuilds), for which both the amount and timing can be reasonably
estimated, are accrued and charged to operations over the period through the
next anticipated maintenance date.
 
    Mineral interests are amortized using the units of production method.
 
    Depreciation is computed using the straight-line method over the estimated
useful lives of the assets, as follows:
 
<TABLE>
<S>                                                             <C>
                                                                  3 to 20
Buildings and improvements....................................     years
                                                                  2 to 15
Machinery and equipment.......................................     years
</TABLE>
 
    Facilities at which operations have temporarily ceased may be placed on a
standby care and maintenance basis. The Company continues to depreciate the
related assets during the standby period, however, the expected useful lives are
adjusted. During the standby period all care and maintenance expenditures
incurred are expensed.
 
    IMPAIRMENT OF LONG-LIVED ASSETS
 
    In fiscal 1997, the Company adopted SFAS No. 121, "Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of."
The statement requires that long-lived assets, certain identifiable intangibles
and goodwill related to those assets be reviewed for impairment when events or
circumstances indicate that the carrying amount of the assets may not be
recoverable. The impairment loss on such assets, as well as long-lived assets
and certain identifiable intangibles to be disposed of, is measured as the
amount by which the carrying value of the assets exceeds the fair value of the
assets. No impairment losses have been recognized.
 
    DEFERRED FINANCING COSTS
 
    Deferred financing costs represent fees paid in conjunction with the
acquisition of long-term debt and are amortized using the interest method over
the term of the respective debt.
 
    EXPLORATION AND DEVELOPMENT COSTS
 
    All exploration costs are charged to operations as incurred. Development
costs incurred to maintain production at operating mines are charged to
operations as incurred. Development expenditures for mining properties that are
considered to be commercially feasible, but are not yet producing, and major
development expenditures at operating mines that are expected to benefit future
production are capitalized and amortized using the units of production method
over the estimated proven ore reserves to be benefited.
 
                                      F-8
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    RECLAMATION COSTS
 
    The Company's mines and related processing facilities are subject to
governance by various agencies that have established minimum standards for
reclamation. Company estimates of mine closure costs are accrued and charged to
expense using the units of production method during the estimated life of the
operations. A reserve for reclamation costs has been established for the
restoration of certain abandoned mining and processing sites based on current
estimates of the cost to comply with existing standards. Routine environmental
expenditures are expensed as incurred or capitalized and depreciated depending
on their future economic benefit.
 
    COMMITMENTS AND CONTINGENCIES
 
    The Company accrues for loss contingencies, including costs associated with
environmental remediation obligations, when such costs are probable and
reasonably estimable. Accruals are reviewed and adjusted as circumstances
change. Costs of future expenditures for environmental remediation obligations
are not discounted to their present value.
 
    REVENUE RECOGNITION
 
    Sales are recorded as products are shipped to customers. Concentrate and
certain smelter product sales are recorded based on estimated weights, metal
contents and prices using applicable customer agreements and hedge contracts.
All such sales are adjusted when final weights, metal contents and prices are
determined.
 
    RISK MANAGEMENT
 
    The Company's use of derivative financial instruments is limited to managing
well-defined commodity price risks related to inventories and future production.
Derivative financial instruments are not used for trading purposes. The Company
may, from time to time, enter into forward physical sales agreements with
customers or futures contracts, which fix prices for a portion of its
anticipated future production, generally for periods not exceeding twelve
months. The Company may also periodically buy futures contracts to offset the
effect of certain fixed-price forward physical sales commitments. In addition,
the Company may employ the use of commodity options to obtain the aforementioned
transactions. Since these transactions meet the requirements for hedge
accounting, gains and losses realized on such transactions, as well as any cost
or revenue associated therewith, are recognized in net sales when the related
production is sold. If an instrument does not meet the requirements for hedge
accounting, gains and losses are recognized immediately.
 
    FAIR VALUE OF FINANCIAL INSTRUMENTS
 
    The fair values of the Company's long-term debt were estimated using
discounted cash flow analyses, based on the estimates of incremental borrowing
rates for similar types of borrowing arrangements. At October 31, 1996 and 1997,
the fair values of the Company's financial instruments, except for the hedge
positions described in Note 13, were not materially different from their
carrying amounts.
 
                                      F-9
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    RESEARCH AND DEVELOPMENT
 
    Research and development costs are expensed when incurred and are included
in selling, general and administrative expenses on the consolidated statements
of operations. Research and development costs are not significant.
 
    INCOME TAXES
 
    Deferred tax assets and liabilities are recognized for the future tax
consequences attributable to differences between the financial statement
carrying amounts of existing assets and liabilities and their respective tax
bases. Deferred tax assets and liabilities are measured using enacted tax rates
expected to apply to taxable income in the years in which those temporary
differences are expected to be recovered or settled. The effect on deferred tax
assets and liabilities of a change in tax rates is recognized in income in the
period that includes the enactment date.
 
    UNAUDITED INTERIM FINANCIAL STATEMENTS
 
    In the opinion of management, the interim consolidated financial statements
contain all adjustments, consisting of normal recurring accruals, necessary to
present fairly the consolidated financial position and results of operations for
the periods presented herein. Interim periods are not necessarily indicative of
results to be expected for the year
 
(2) BUSINESS ACQUISITION
 
    Doe Run Cayman Ltd. ("Doe Run Cayman"), a Cayman Islands corporation and a
wholly owned subsidiary of the Company, was incorporated on September 10, 1997.
Doe Run Cayman had no business activity until October 23, 1997, when Doe Run
Cayman, through its subsidiary Doe Run Peru S.R. Ltda. ("Doe Run Peru"),
acquired substantially all of the outstanding shares of Empresa Metalurgica La
Oroya S.A. ("Metaloroya"). Metaloroya is a Peruvian corporation, which was
formed for purposes of consummating the sale of certain assets and liabilities
of La Oroya, a division of Empresa Minera del Centro del Peru S.A.
("Centromin"), an entity owned by the Peruvian government. Doe Run Cayman's
operating subsidiaries in Peru will herein be referred to as "Doe Run Peru."
 
    The acquisition was made through a Contract of Stock Transfer, Capital
Increase and Stock Subscription (the "Contract"). Peruvian law required a
capital contribution to Metaloroya of $126,500 in exchange for 51% of the shares
and a payment of $120,515 for the transfer of the remaining 49%. Subsequent to
the acquisition, utilizing the proceeds from the capital contribution, Doe Run
Peru repaid $125,000 on the $225,000 term loan used to finance the transaction.
 
                                      F-10
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(2) BUSINESS ACQUISITION (CONTINUED)
    The acquisition has been accounted for as a purchase and the effective
purchase price of $123,015, including transaction costs of approximately $2,500,
was allocated to the fair value of the assets acquired and liabilities assumed
as follows:
 
<TABLE>
<S>                                                                 <C>
Inventories.......................................................  $  55,567
Other current assets..............................................      1,382
Property, plant and equipment.....................................     97,761
Accounts payable and other accrued liabilities....................    (24,495)
Environmental contingency.........................................     (7,200)
                                                                    ---------
                                                                    $ 123,015
                                                                    ---------
                                                                    ---------
</TABLE>
 
    The excess of the fair value of the net assets acquired over the purchase
price, approximately $157,000, reduced the value of the fixed assets acquired.
The results of the operations of Doe Run Peru have been included with those of
the Company since the date of acquisition.
 
    The following unaudited pro forma results of operations for the years ended
October 31, 1996 and 1997 assume that the acquisition of Doe Run Peru occurred
as of the beginning of the respective periods. The pro forma information does
not purport to be indicative of the results of operations that would have
occurred had the acquisition occurred at the beginning of the periods presented
or of the future results of operations.
<TABLE>
<CAPTION>
                                                                        YEAR ENDED OCTOBER 31,
                                                                        ----------------------
<S>                                                                     <C>         <C>
                                                                           1996        1997
                                                                        ----------  ----------
 
<CAPTION>
                                                                             (UNAUDITED)
<S>                                                                     <C>         <C>
Net sales.............................................................  $  731,727  $  709,780
Net income before extraordinary item..................................      22,649      15,195
Net income............................................................      22,649      14,133
</TABLE>
 
(3) RELATED PARTY TRANSACTIONS
 
    The Company has entered into a management consulting agreement with The
Renco Group, Inc. ("Renco"). Renco holds all of the preferred stock of the
Company, and Renco's subsidiary, DR Acquisition Corp. holds all of the Company's
common stock. Under the agreement, Renco will provide the Company with
management services for a fee of $1,200 annually. The agreement expires October
31, 2000. Fees expensed under this agreement were $1,200 for each of the years
ended October 31, 1995, 1996 and 1997.
 
    To obtain the advantages of volume, Renco purchases certain categories of
property and casualty insurance for a number of its subsidiaries, including the
Company, and the actual cost of such insurance, without markup, is reimbursed by
the covered subsidiaries. For the years ended October 31, 1995, 1996 and 1997
the Company reimbursed Renco for costs of approximately $1,754, $1,821 and
$2,473 respectively, under the Renco insurance program.
 
                                      F-11
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(4) INVENTORIES
 
    Inventories consist of the following:
 
<TABLE>
<CAPTION>
                                                                  OCTOBER 31,
                                                              --------------------
                                                                1996       1997
                                                              ---------  ---------  APRIL 30,
                                                                                       1998
                                                                                    ----------
                                                                                    (UNAUDITED)
<S>                                                           <C>        <C>        <C>
Finished metals and concentrates............................  $   6,408  $  11,460  $   19,005
Metals and concentrates in process..........................      9,520     51,129      54,346
Materials, supplies and repair parts........................     14,091     26,059      27,516
                                                              ---------  ---------  ----------
                                                              $  30,019  $  88,648  $  100,867
                                                              ---------  ---------  ----------
                                                              ---------  ---------  ----------
</TABLE>
 
    Materials, supplies and repair parts are stated net of reserves for
obsolescence of $4,866, $4,977 and $4,782 at October 31, 1996 and 1997 and April
30, 1998, respectively.
 
    The FIFO cost of inventories valued under the LIFO cost method were $19,508
and $20,311 at October 31, 1996 and 1997, respectively. If the FIFO cost method
had been used to determine cost, inventories would have been $5,996 higher at
October 31, 1997 and at April 30, 1998.
 
    As a result of reducing certain inventory quantities valued on the LIFO
basis, lower inventory costs prevailing in previous years were charged to cost
of sales in 1995, 1996 and 1997. In 1996, the Company adopted a policy of
calculating the effect of LIFO liquidations on net income based on the current
cost method. The effect was an increase in net income of $111, $542, and $899
for the years ended October 31, 1995, 1996 and 1997, respectively.
 
(5) PROPERTY, PLANT AND EQUIPMENT, NET
 
    Property, plant and equipment, net consists of the following:
 
<TABLE>
<CAPTION>
                                                                             OCTOBER 31,
                                                                        ----------------------
<S>                                                                     <C>         <C>
                                                                           1996        1997
                                                                        ----------  ----------
Land..................................................................  $    3,347  $    9,371
Buildings and improvements............................................      27,054      45,286
Machinery and equipment...............................................      77,056     172,582
Mineral interests.....................................................      20,920      22,005
Construction in progress..............................................       7,486       3,252
                                                                        ----------  ----------
                                                                           135,863     252,496
Less accumulated depreciation and depletion                                 31,701      46,148
                                                                        ----------  ----------
                                                                        $  104,162  $  206,348
                                                                        ----------  ----------
                                                                        ----------  ----------
</TABLE>
 
    Rental expense applicable to minimum rentals under operating leases was
$1,460, $3,101 and $5,543 for the years ended October 31, 1995, 1996, and 1997,
respectively. Contingent rental payments, based primarily on equipment usage,
were $309, $554, and $674 for the same periods.
 
                                      F-12
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(5) PROPERTY, PLANT AND EQUIPMENT, NET (CONTINUED)
    The Company's operating leases relate primarily to operating equipment,
office facilities and office equipment. The minimum rental commitments under
noncancellable leases, with terms in excess of one year, are as follows:
 
<TABLE>
<CAPTION>
FISCAL YEAR ENDING OCTOBER 31,
- -----------------------------------------------------------------------------------
<S>                                                                                  <C>
1998...............................................................................  $   6,197
1999...............................................................................      4,486
2000...............................................................................      3,662
2001...............................................................................      2,924
2002...............................................................................      1,393
                                                                                     ---------
                                                                                     $  18,662
                                                                                     ---------
                                                                                     ---------
</TABLE>
 
                                      F-13
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(6) ACCRUED LIABILITIES
 
    Accrued liabilities consist of the following:
 
<TABLE>
<CAPTION>
                                                                              OCTOBER 31,
                                                                          --------------------
<S>                                                                       <C>        <C>
                                                                            1996       1997
                                                                          ---------  ---------
Reclamation and environmental...........................................  $   4,393  $   3,842
Property taxes..........................................................      3,441      3,299
Compensated absences....................................................      2,734      3,076
Salaries, wages, fringes................................................      6,157      7,943
Other...................................................................      7,595     10,733
                                                                          ---------  ---------
                                                                          $  24,320  $  28,893
                                                                          ---------  ---------
                                                                          ---------  ---------
</TABLE>
 
    Reclamation and environmental costs represents the estimate of reclamation
and environmental spending for the following fiscal year. These costs relate
primarily to the historical operations of the Company. See Note 14.
 
                                      F-14
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(7) LONG-TERM DEBT
 
    Long-term debt consists of the following:
 
<TABLE>
<CAPTION>
                                                                                               AS OF OCTOBER 31,
                                                                                             ---------------------
                                                                                               1996        1997
                                                                                             ---------  ----------
<S>                                                                                          <C>        <C>
$130,000 term loan--due quarterly in increasing amounts, with a balloon payment of $60,000
  due October 31, 2003; effective rate of 8.64% at October 31, 1997........................  $  --      $  130,000
$225,000 term loan--due quarterly in increasing amounts, with a balloon payment of $42,000
  due October 23, 2002; effective rate of 9.14% at October 31, 1997........................     --         100,000
Revolving loan dated October 23, 1997--expiring October 23, 2002, interest payable
  quarterly at the Eurodollar rate, plus 2.5% (8.12% at October 31, 1997)..................     --           3,000
Pollution control financing--maturing December 15,1998, annual principal payments due on
  December 15, interest at 5.75%, payable semi-annually....................................      2,540       1,740
Revolving loan dated April 7, 1994--interest payable monthly at the prime rate (8.75% at
  October 31, 1996) plus 1.75%, plus 0.5% on the unused portion of the loan................      9,399      --
Term loan--payable in monthly installments of $256 plus interest at the prime rate plus
  1.75%....................................................................................      4,823      --
Senior note--maturing September 1, 1998, principal payments of $125 due quarterly, interest
  payable monthly at a rate of 12%. Contingent interest is due quarterly, based on an
  indexed market rate, 16.72% at October 31, 1996..........................................      9,297      --
Promissory note--maturing February 28, 2002, principal payable as percentage of gross
  margin over a specific base amount, plus interest due annually, bearing interest at 4%
  through February 28, 1996 increasing 1% each year through February 28, 2001, face amount
  of $50,000 discounted to effective interest rate of 15.5%................................     36,772      --
Contract obligation--payable in annual principal payments of $5,100 and a balloon payment
  of $15,100 due April 1, 1999 non-interest bearing, face amount of $35,500 discounted to
  an effective interest rate of 14.5%......................................................     19,960      --
                                                                                             ---------  ----------
                                                                                             $  82,791  $  234,740
 
Less current maturities....................................................................     16,590      12,345
                                                                                             ---------  ----------
Long-term debt, less current maturities....................................................  $  66,201  $  222,395
                                                                                             ---------  ----------
                                                                                             ---------  ----------
</TABLE>
 
    On October 23, 1997 the Company and Doe Run Peru borrowed $130,000 and
$225,000, respectively, under credit agreements with a group of financial
institutions. The proceeds were used to retire all of the Company's outstanding
debt, except for the Pollution Control Bonds, and to finance the acquisition and
capital contribution discussed in Note 2. The applicable interest rate on the
loans is the greater of the Eurodollar rate (adjusted for the maximum reserve
percentages as established by the Federal Reserve Board) or the ten-year U.S.
Treasury bond rate, plus an applicable margin: 2.5%, to increase 0.25% per
quarter on the $130,000 loan and 3%, to increase .25% annually, on the $225,000
loan.
 
    The credit agreements also provided for borrowing under two credit
facilities. The first facility allows the Company to borrow up to $100,000 and
expires October 23, 2002. The availability of funds under the
 
                                      F-15
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(7) LONG-TERM DEBT (CONTINUED)
facility is limited to a percentage of eligible accounts receivable and
inventories. Actual availability was $40,417 at October 31, 1997. The facility
bears interest at a base rate plus an applicable margin. The base rate is equal
to the greater of 1) the adjusted certificate of deposit rate plus .5%, 2) the
financial institutions' prime lending rate, or 3) the Federal funds rate plus
 .5%; or the adjusted Eurodollar rate as specified by the Company. The applicable
margin is 2.5%, or .75% in the case of Eurodollar rate loans. The Company is
also obligated to pay an unused line fee equal to .375% on the amount by which
the maximum credit of $100,000 exceeds outstanding loans and letters of credit.
All cash received from the Company's domestic operations is wired daily to the
financial institutions to pay down the outstanding loan balance, if any.
Revolving loans and standby letters of credit outstanding under this facility
were $0 and $6,100, respectively, at October 31, 1997.
 
    The second facility allows Doe Run Peru to borrow up to $50,000 and expires
October 23, 2002. The interest rate is due to increase .25% annually. An unused
line fee of .5% per annum on the average unused portion of the line is payable
quarterly, in arrears. Availability of funds under the facility is limited to a
percentage of eligible accounts receivable and inventories. Actual availability
was $29,332 at October 31, 1997. Revolving loans and standby letters of credit
outstanding under this facility were $3,000 and $3,300, respectively, at October
31, 1997.
 
    Pollution control financing represents the outstanding balances of revenue
bonds issued to provide funding for pollution control facilities at the
Company's domestic primary lead smelter. The debt is guaranteed by the former
owner of the Company.
 
    Effective January 31, 1997, the Company amended the terms of the revolving
and term loans dated April 7, 1994. The amendment reduced the interest rate
payable, increased the amount of the term loan, and extended the term of the
revolving and term loans, which were due to mature April 7, 1997 and April 7,
1998, respectively. Pursuant to the amendment, the Company borrowed an
additional $10,945 on the term loan, for a new principal balance of $15,000, due
in monthly installments, maturing January 2002. The proceeds were used to retire
the senior note balance of $9,172 on January 31, 1997 and pay contingent
interest of $1,426. These loans were retired with the proceeds of the $130,000
term loan as discussed above.
 
    Virtually all of the Company's assets are pledged to secure long-term debt.
 
    In conjunction with early extinguishments of long-term debt in 1997, the
Company recognized extraordinary charges of $1,062, net of income tax benefit of
$265.
 
    The aggregate estimated amounts of long-term debt maturing after October 31,
1997 are as follows:
 
<TABLE>
<S>                                                                 <C>
1998..............................................................  $  12,345
1999..............................................................     21,395
2000..............................................................     35,500
2001..............................................................     33,500
2002..............................................................     72,000
Thereafter........................................................     60,000
                                                                    ---------
                                                                    $ 234,740
                                                                    ---------
                                                                    ---------
</TABLE>
 
                                      F-16
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(7) LONG-TERM DEBT (CONTINUED)
    In addition to scheduled principal payments on the term loans, additional
payments may be required based on cash flow for the previous fiscal year,
beginning with the year ended October 31, 1998.
 
    The Company's various debt agreements contain certain requirements with
respect to net worth, leverage ratios, and coverage of fixed charges, which
begin in fiscal 1998. These agreements also place limitations on dividend
payments and other outside borrowings and restrict annual capital expenditures.
The Company was in compliance with all debt covenants at October 31, 1997, and
accordingly, the related debt is classified as long-term. As of January 31,
1998, the Company had received waivers from its lenders with respect to the net
worth and leverage ratio requirements under the $130,000 term loan and revolving
loan under the $100,000 credit facility. The waivers are effective for the
quarter ended January 31, 1998 with respect to the leverage ratio requirements
and for the two quarters ending April 30, 1998 with respect to the net worth
requirements. The Company refinanced all of the loans outstanding under the
credit agreements during the quarter ending April 30, 1998.
 
(8) INCOME TAXES
 
    The Company files a consolidated federal income tax return with Renco.
Pursuant to a tax sharing agreement with Renco, the Company provides for federal
income taxes as if the Company filed separate income tax returns except that,
generally, no carryforward of net operating losses is permitted, unless such
losses are generated by net tax temporary differences. Under the terms of the
agreement, the Company is required to remit annually to Renco the amount of
federal income taxes provided. Renco files the Company's state income tax
returns, and the Company remits the resulting tax to Renco. Doe Run Peru and its
subsidiaries pay taxes directly to their respective jurisdictions in which
income and other similar taxes arise.
 
    Doe Run Cayman is subject to the regulations of the Cayman Islands, which
currently have no corporate income or capital gains tax. Doe Run Cayman's
subsidiaries located in Peru are subject to Peruvian taxation. The statutory
income tax rate in Peru is 30%. Doe Run Peru is subject to a ten-year tax
stabilization agreement with the Peruvian government, which provides for
Peruvian taxation based on tax statutes and regulations prevailing on October
21, 1997. Metaloroya is subject to a tax stabilization agreement with the
Peruvian government, which provides for Peruvian taxation based on tax statutes
and regulations prevailing on April 25, 1994. This agreement was modified, and
an election was made to adopt the tax statutes and regulations as of November 6,
1997, beginning with the Peruvian tax year ending on December 31, 1997, through
December 31, 2006.
 
                                      F-17
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(8) INCOME TAXES (CONTINUED)
    Income tax expense is comprised of the following:
 
<TABLE>
<CAPTION>
                                                                       YEAR ENDED OCTOBER 31,
                                                                   -------------------------------
                                                                     1995       1996       1997
                                                                   ---------  ---------  ---------
<S>                                                                <C>        <C>        <C>
Current:
  Federal........................................................  $   3,175  $   6,383  $   3,882
  State..........................................................         77         68         99
  Foreign........................................................     --         --            419
                                                                   ---------  ---------  ---------
                                                                       3,252      6,451      4,400
 
Deferred:
  Foreign........................................................     --         --            (69)
                                                                   ---------  ---------  ---------
                                                                   $   3,252  $   6,451  $   4,331
                                                                   ---------  ---------  ---------
                                                                   ---------  ---------  ---------
</TABLE>
 
    Income tax expense differed from the amount computed by applying the
statutory federal corporate income tax rate of 35% to income before income tax
expense as a result of the following:
 
<TABLE>
<CAPTION>
                                                                    YEAR ENDED OCTOBER 31,
                                                                -------------------------------
                                                                  1995       1996       1997
                                                                ---------  ---------  ---------
<S>                                                             <C>        <C>        <C>
Income tax expense at statutory rate..........................  $   2,651  $   6,620  $   1,392
Increase (reduction) in income tax expense resulting from:
  Percentage depletion in excess of basis.....................     (2,344)    (4,583)    (2,532)
  Change in the balance of the valuation allowance for
    deferred tax assets.......................................      2,808      4,095      4,487
  Nondeductible expenses......................................         66        385        477
  State income taxes, net of federal benefit..................         64         56         64
  Foreign income taxes at effective rates in excess of the
    statutory rate............................................     --         --            324
  Other, net..................................................          7       (122)       119
                                                                ---------  ---------  ---------
                                                                $   3,252  $   6,451  $   4,331
                                                                ---------  ---------  ---------
                                                                ---------  ---------  ---------
</TABLE>
 
                                      F-18
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(8) INCOME TAXES (CONTINUED)
    The tax effects of temporary differences that give rise to significant
portions of the deferred tax assets and deferred tax liabilities are as follows:
 
<TABLE>
<CAPTION>
                                                                          AS OF OCTOBER 31,
                                                                        ----------------------
                                                                           1996        1997
                                                                        ----------  ----------
<S>                                                                     <C>         <C>
Deferred tax assets:
  Inventories and other current assets................................  $      364  $      514
  Accrued liabilities.................................................       3,268       3,099
  Postretirement benefits.............................................       4,920       4,781
  Reclamation and environmental costs.................................      10,278       9,399
  Other noncurrent assets and liabilities.............................      11,924      14,346
                                                                        ----------  ----------
                                                                            30,754      32,139
  Less valuation allowance............................................      (8,841)    (13,328)
                                                                        ----------  ----------
    Total deferred tax assets.........................................      21,913      18,811
                                                                        ----------  ----------
Deferred tax liabilities:
  Inventories and other current assets................................         (78)     --
  Property, plant and equipment.......................................     (10,883)    (11,557)
  Mineral Properties..................................................      (5,136)     (4,856)
  Pension asset.......................................................      (2,630)     (2,329)
  Long-term debt......................................................      (3,186)     --
                                                                        ----------  ----------
    Total deferred tax liabilities....................................     (21,913)    (18,742)
                                                                        ----------  ----------
      Net deferred tax assets.........................................  $   --      $       69
                                                                        ----------  ----------
                                                                        ----------  ----------
</TABLE>
 
    The deferred tax liabilities related to inventories, other current assets
and property, plant and equipment are principally due to differences in book and
tax allocations of the excess of the fair value of the sum of assets acquired,
less liabilities assumed over the purchase price paid. Accruals for financial
reporting purposes, which have no tax basis, gave rise to a significant portion
of the other temporary differences.
 
    The Company recognized a deferred tax asset of $8,451 and $10,188 for an
alternative minimum tax carryforward at October 31, 1996 and 1997, respectively,
which is included above in other noncurrent assets and liabilities. The
alternative minimum tax carryforward is available to reduce future Federal
regular income taxes, if any, over an indefinite period.
 
    Management has provided a valuation allowance against certain domestic
deferred tax assets, to the extent that it is unlikely, that the benefits of
those assets will be realized.
 
                                      F-19
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(9) EMPLOYEE BENEFITS
 
DOMESTIC PLANS
 
    DEFINED BENEFIT PLANS
 
    The Company sponsors a non-contributory defined benefit plan.
 
    Benefits provided to salaried employees under the defined benefit plan are
based on final average compensation and years of service. Benefits provided to
hourly employees are based on a flat rate and years of service. Net periodic
pension expense (income) is comprised of the following:
 
<TABLE>
<CAPTION>
                                                                    YEAR ENDED OCTOBER 31,
                                                                -------------------------------
                                                                  1995       1996       1997
                                                                ---------  ---------  ---------
<S>                                                             <C>        <C>        <C>
Service cost..................................................  $     865  $   1,342  $   1,439
Interest cost on projected benefit obligation.................      3,025      3,506      3,660
Actual return on assets.......................................     (5,016)    (4,168)    (7,306)
Net amortization and deferral of unrecognized net losses......      1,007        176      3,333
                                                                ---------  ---------  ---------
Net periodic pension expense (income).........................  $    (119) $     856  $   1,126
                                                                ---------  ---------  ---------
                                                                ---------  ---------  ---------
</TABLE>
 
    The following assumptions were used in the determination of net periodic
pension expense (income):
 
<TABLE>
<CAPTION>
                                                                     YEAR ENDED OCTOBER 31,
                                                                 -------------------------------
<S>                                                              <C>        <C>        <C>
                                                                   1995       1996       1997
                                                                 ---------  ---------  ---------
Discount rates.................................................       9.00%      7.50%      7.75%
Rate of increase in compensation levels........................       3.00       3.00       3.00
Expected long-term rate of return on assets....................       9.00       9.00       9.00
</TABLE>
 
    The following table sets forth the funded status of the Company's defined
benefit plan:
 
<TABLE>
<CAPTION>
                                                                          AS OF OCTOBER 31,
                                                                        ----------------------
                                                                           1996        1997
                                                                        ----------  ----------
<S>                                                                     <C>         <C>
Actuarial present value of benefit obligations:
  Vested benefit obligation...........................................  $  (38,385) $  (43,417)
  Non-vested obligation...............................................      (2,261)     (2,758)
                                                                        ----------  ----------
    Accumulated benefit obligation....................................  $  (40,646) $  (46,175)
                                                                        ----------  ----------
                                                                        ----------  ----------
Projected benefit obligation..........................................  $  (46,758)    (51,748)
Less plan assets at fair value, primarily investments in common stock
  and corporate bonds.................................................      47,401      51,359
                                                                        ----------  ----------
Plan assets in excess of projected benefit obligation.................         643        (389)
Unrecognized net loss.................................................       6,207       6,457
                                                                        ----------  ----------
    Pension asset, including in other noncurrent assets, net..........  $    6,850  $    6,068
                                                                        ----------  ----------
                                                                        ----------  ----------
</TABLE>
 
    The weighted average discount rate used in determining the projected benefit
obligation was 7.75% and 7.5% as of October 31, 1996 and 1997, respectively. The
unrecognized net loss is amortized over the average remaining service period of
employees expected to receive benefits under the plan.
 
                                      F-20
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(9) EMPLOYEE BENEFITS (CONTINUED)
 
    The Company also adopted a supplemental defined benefit plan, The
Supplemental Employee Retirement Plan (SERP), effective November 1, 1996. The
SERP provides benefits to those participants of the defined benefit plan whose
benefits under the plan are limited by Sections 401(a)(17) or 415 of the
Internal Revenue Code. Benefits under the SERP represent the amount by which the
benefits under the defined benefit plan, if such benefits were not limited,
exceed those benefits the participants are entitled to receive. The SERP is
unfunded. The Company recorded pension expense of $259 for the year ended
October 31, 1997, an intangible pension asset of $624, and a pension liability
of $883 at October 31, 1997 with respect to the SERP plan.
 
    POSTRETIREMENT BENEFIT PLANS
 
    The Company sponsors three postretirement medical plans. The plans generally
cover medical expenses subject to deductibles, copayments and limits on
specified coverage. For persons retired on or before January 1, 1992, the
retiree's contribution to the cost of these plans varies primarily based upon
the date of retirement and the respective plan. Effective January 1, 1992, the
Company's contribution to the cost of coverage of employees retiring after that
date has decreased gradually, until, beginning in 1997, retirees pay 100% of the
cost of coverage. The Company maintains stop-loss insurance for claims exceeding
$200 per person in any calendar year.
 
    The postretirement benefit plans are unfunded. The following illustrates the
Company's postretirement benefit obligation:
 
<TABLE>
<CAPTION>
                                                                           AS OF OCTOBER 31,
                                                                          --------------------
                                                                            1996       1997
                                                                          ---------  ---------
<S>                                                                       <C>        <C>
Accumulated postretirement benefit obligation:
  Retirees..............................................................  $  11,418  $  10,169
  Fully eligible active participants....................................        171        135
  Other actives.........................................................        257        248
                                                                          ---------  ---------
                                                                             11,846     10,552
Unrecognized net gain...................................................      1,901      2,818
                                                                          ---------  ---------
  Postretirement benefit obligation.....................................  $  13,747  $  13,370
                                                                          ---------  ---------
                                                                          ---------  ---------
</TABLE>
 
    Net periodic postretirement benefit cost includes the following components:
 
<TABLE>
<CAPTION>
                                                                          YEAR ENDED OCTOBER 31,
                                                                      -------------------------------
                                                                        1995       1996       1997
                                                                      ---------  ---------  ---------
<S>                                                                   <C>        <C>        <C>
Service cost........................................................  $      33  $      23  $      34
Interest cost.......................................................      1,076        886        789
Amortization of gains...............................................         --        (23)      (104)
                                                                      ---------  ---------  ---------
  Net periodic postretirement benefit cost..........................  $   1,109  $     886  $     719
                                                                      ---------  ---------  ---------
                                                                      ---------  ---------  ---------
</TABLE>
 
    The weighted average annual assumed rate of increase in the per capita cost
of covered benefits (I.E., health care cost trend rate) for the medical plans is
8% for fiscal 1998, and is assumed to decrease gradually to 5% by the year 2001,
and remain at that level thereafter. A one-percentage point increase in
 
                                      F-21
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(9) EMPLOYEE BENEFITS (CONTINUED)
each year would increase the accumulated postretirement benefit obligation and
the net periodic postretirement benefit cost by $612 and $48, respectively.
 
    The weighted average discount rate used in determining the accumulated
postretirement benefit obligation was 7.75% and 7.50% at October 31, 1996 and
1997, respectively.
 
    DEFINED CONTRIBUTION AND PROFIT SHARING PLANS
 
    The Company sponsors a 401(k) plan that covers substantially all salaried
and hourly employees. Participants can contribute up to 15% of compensation on a
before-tax basis. The Company matches 25% of the first 6% of a participant's
before-tax contribution. The Company's expense representing its matching
contribution was $307, $360 and $499 for the years ended October 31, 1995, 1996
and 1997, respectively. Plan assets consist primarily of investments in common
stock and debt securities.
 
    On February 28, 1995, the Company adopted a profit sharing program, which
covers substantially all salaried and hourly employees. The program provides for
a distribution to employees equal to 15% of income before income tax expense. At
management's discretion, a portion of the distribution may be made in the form
of a contribution to the 401(k) plan. The remainder is paid in cash to
employees. The Company's expense for the years ended October 31, 1995, 1996 and
1997 was $1,388, $3,492 and $493, respectively.
 
    FOREIGN PLANS
 
    Doe Run Peru is required to make semi-annual deposits into a bank account
for severance indemnity benefits for Doe Run Peru employees under Peruvian
government regulations. The balance in the account represents the full benefit
due to such employees upon termination. The Company accrues for the additional
amount that would be contributed to the account since the last deposit date as
if all such employees were to terminate as of the balance sheet date.
 
    In accordance with government regulations in Peru, employees are entitled to
receive 8% of the Doe Run Peru's taxable income, 50% of which is distributed to
employees based on number of days worked, and the remaining distributed in
proportion to their salaries.
 
(10) PREFERRED STOCK (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
    The Company had 2,500 shares of preferred stock with a $1,000 par value
authorized, issued and outstanding at October 31, 1996 and 1997. The shares are
owned by Renco. The shares are redeemable solely at the option of the Company at
$1,000 per share plus any unpaid dividends.
 
    Cumulative annual dividends of $80 per share are payable quarterly on the
first day of January, April, July and October and must be paid before dividends
on common stock can be paid. The Company declared and paid dividends of $100 per
share on each of its 2,500 shares on December 30, 1996. Dividends in arrears at
October 31, 1996 and 1997 were $168 and $118, respectively. At October 31, 1996
and 1997, no dividends were accrued as none had been declared.
 
                                      F-22
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(11) BUSINESS AND CREDIT CONCENTRATIONS
 
    Lead prices fluctuate and are affected by numerous factors beyond the
Company's control, including expectations for inflation, speculative activities,
the relative exchange rate of the U.S. dollar, global and regional demand and
production, political and economic conditions and production costs in major
producing regions. The aggregate effect of these factors makes it impossible for
the Company to predict lead prices. Fluctuations in the lead price could have a
material adverse effect on the results of operations, financial condition, and
liquidity of the Company.
 
    For the years ended October 31, 1995, 1996 and 1997 approximately 59%, 67%
and 63%, respectively, of the Company's revenues were from U.S. battery
manufacturers (primarily automotive) or their suppliers. At October 31, 1996 and
1997, the accounts receivable balances related to these U.S. battery
manufacturers were $39,246 and $35,162, respectively.
 
    For the years ended October 31, 1995, 1996 and 1997 the Company relied on
one battery customer, Johnson Controls, Inc., for approximately 13%, 14% and 12%
of its revenue, respectively. Related accounts receivable balances were $9,394
and $6,501 at October 31, 1996 and 1997, respectively. An additional 10% of
revenues were attributed to East Penn Manufacturing Co., Inc., a battery
manufacturer, for the year ended October 31, 1996, and Big River Zinc
Corporation for the year ended October 31, 1997. No other customer accounted for
greater than 10% of revenues for the year ended October 31, 1995.
 
(12) SEGMENT INFORMATION
 
    The Company operates in one industry segment for financial reporting
purposes.
 
    Doe Run Peru's net sales and income from operations were $2,571 and $359,
respectively, for the period from October 23 to October 31, 1997. There were no
intraenterprise sales between geographic segments during this period. Doe Run
Peru's identifiable assets were $171,000 at October 31, 1997.
 
(13) COMMITMENTS AND CONTINGENCIES
 
    INVESTMENT COMMITMENT
 
    According to the Contract described in Note 2, Doe Run Peru is obligated to
invest $120,000 through October 23, 2002 to expand and modernize its operations,
including certain expenditures to comply with environmental regulations in Peru,
as discussed in Note 14. In the event Doe Run Peru has not fulfilled its
obligations under the Contract, it will be obligated to pay in 2002 a penalty to
Centromin Peru S.A. equal to 30% of any shortfall. Management plans to fund its
commitments through future operating cash flows.
 
    TOLLING
 
    The Company has entered into a tolling arrangement with a major battery
manufacturer whereby the manufacturer will deliver spent lead-acid batteries and
other lead-bearing material to the Company's recycling facility and, for a
processing fee, the Company will return finished lead metal. The agreement,
which expires in September 1999, covers approximately 14% of the Company's
anticipated domestic lead metal production.
 
                                      F-23
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(13) COMMITMENTS AND CONTINGENCIES (CONTINUED)
    SALES
 
    The Company has commitments to sell approximately 70% of its anticipated
domestic lead production under agreements, with terms of generally less than one
year. Sales prices are generally based on the London Metal Exchange prices at
the time of shipment, plus a premium.
 
    HEDGING
 
    The fair market value of the Company's hedging positions at October 31, 1996
and 1997, is the difference between quoted prices at the respective period-end
and the contract settlement value. The fair market value represents the
estimated net cash the Company would receive (pay) if the contracts were
canceled on the respective dates. As management has designated these contracts
as hedges, the related gains and losses will be recognized in net sales when the
related production is sold.
 
    The Company's open hedging positions at April 30, 1998 (unaudited) were
(numbers not in thousands):
 
    FUTURE SALES (PURCHASE) CONTRACTS
 
<TABLE>
<CAPTION>
METAL                            QUANTITY                 PRICE RANGE           FAIR MARKET VALUE         PERIOD
- -------------------------  --------------------  -----------------------------  -----------------  ---------------------
<S>                        <C>        <C>        <C>           <C>              <C>                <C>
Lead.....................    (22,900) tons       $ 0.2384/lb.  to $0.2971/lb.     $     (71,328)   May 98 to May 99
Copper...................      1,378  tons       $ 0.7675/lb.  to $0.8097/lb.     $    (138,779)   May 98 to Sept. 98
Zinc.....................        276  tons       $ 0.6001/lb.                     $      59,128    May 98
Silver...................    637,624  oz.        $  6.18 /oz.  to $6.30 /oz.      $      11,034    May 98
</TABLE>
 
    The Company's open hedging positions at October 31, 1997 were (numbers not
in thousands):
 
    FUTURES SALES CONTRACTS
 
<TABLE>
<CAPTION>
METAL                         QUANTITY             PRICE RANGE          FAIR MARKET VALUE         PERIOD
- -------------------------  --------------  ---------------------------  -----------------  ---------------------
<S>                        <C>             <C>                          <C>                <C>
Lead.....................      5,594 tons  $ 0.2716/lb. to $0.3243/lb.     $   253,391     Nov. 97 to Dec. 98
Copper...................      1,213 tons  $ 0.9525/lb. to $1.0097/lb.     $   142,174     Nov. 97 to Feb. 98
Zinc.....................      2,535 tons  $ 0.6001/lb. to $0.6652/lb.     $   210,744     Nov. 97 to May 98
</TABLE>
 
    The above commitments represent less than 20% of the Company's estimated
sales for the year ending October 31, 1998.
 
    The Company's open hedging positions at October 31, 1996 were (numbers not
in thousands):
 
    FUTURES SALES (PURCHASE) CONTRACTS
 
<TABLE>
<CAPTION>
METAL                         QUANTITY              PRICE RANGE          FAIR MARKET VALUE         PERIOD
- -------------------------  ---------------  ---------------------------  -----------------  ---------------------
<S>                        <C>              <C>                          <C>                <C>
Lead.....................    (19,869) tons  $ 0.3384/lb. to $0.3765/lb.     $    54,692     Nov. 96 to Oct. 97
Copper...................       2,811 tons  $ 0.8573/lb. to $1.1290/lb.     $   687,136     Nov. 96 to Mar. 97
Zinc.....................       6,063 tons  $ 0.4990/lb. to $0.5026/lb.     $   259,087     Nov. 96 to Jan. 97
</TABLE>
 
    SOLD CALL OPTION CONTRACTS
 
<TABLE>
<CAPTION>
METAL                                         QUANTITY    PRICE RANGE     FAIR MARKET VALUE           PERIOD
- -------------------------------------------  -----------  ------------  ---------------------  ---------------------
<S>                                          <C>          <C>           <C>                    <C>
Lead.......................................   2,576 tons  $ 0.3600/lb.           --               Nov. 96 to Dec. 96
</TABLE>
 
    The Company is exposed to risk from market price fluctuations to the extent
it cannot meet anticipated sales.
 
    The Company does not obtain collateral or other security to support hedge
instruments subject to credit risk, but assesses the reliability and reputation
of its counterparties before contracts are established.
 
                                      F-24
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(13) COMMITMENTS AND CONTINGENCIES (CONTINUED)
    LETTERS OF CREDIT
 
    At October 31, 1996 and 1997, the Company's lender had issued irrevocable
standby letters of credit totaling $5,342 and $6,100, respectively, in
connection with the Company's insurance and bonding activities. At October 31,
1997, the Company's lender had issued a $3,300 standby letter of credit as a
guarantee for a potential purchase price adjustment related to the acquisition
of Metaloroya, as required by the Contract.
 
    EMPLOYMENT AGREEMENTS
 
    The Company has employment agreements with a number of its senior executives
through October 31, 1999.
 
    ADDITIONAL PAYMENTS RELATED TO ACQUISITIONS
 
    The terms of an agreement with the previous owners of The Doe Run Company
(predecessor to the Company) provided that, beginning with the fiscal period
ending October 31, 1994, additional payments may be required based on a
percentage of gross margin for those periods in excess of a specified base
amount. Payments made under the agreement were $237 and $5,778 in the fiscal
years ended October 31, 1996 and 1997, respectively. In conjunction with the
retirement of the obligations due to the previous owners, the amount paid
exceeded recorded obligations by $5,108. This amount was recorded as additional
purchase price paid for the assets of the Company acquired from the previous
owners. The Company was released from further obligation under the agreement.
 
    Pursuant to an Asset Purchase Agreement (the "Purchase Agreement")
additional consideration may be due to the former owners of Seafab if certain
earnings levels are met for the five-year period beginning November 1, 1996.
Payments made in fiscal 1997 totaled $181.
 
(14) ENVIRONMENTAL AND LITIGATION MATTERS
 
    ENVIRONMENTAL
 
    DOMESTIC OPERATIONS
 
    Doe Run is subject to numerous federal, state and local environmental laws
and regulations governing, among other things, air emissions, waste water
discharge, solid and hazardous waste treatment, and storage, disposal and
remediation of releases of hazardous materials. In common with much of the
mining industry, Doe Run's facilities are located on sites that have been used
for heavy industrial purposes for decades and may require remediation. Doe Run
has made and intends to continue making the necessary expenditures for
environmental remediation and compliance with environmental laws and
regulations. Environmental laws and regulations may become more stringent in the
future which could increase costs of compliance.
 
    The Company has recorded a liability of $35,527 as of October 31, 1997,
which represents management's best estimate of known obligations relating to
environmental and reclamation matters, which are discussed below.
 
    Primary smelter slag produced by and stored at the primary smelter in
Herculaneum, Missouri is currently exempt from hazardous waste regulation under
the Resource Conservation and Recovery Act of 1976, as amended ("RCRA"). The
Company has accrued approximately $1,200 related to the Herculaneum
 
                                      F-25
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(14) ENVIRONMENTAL AND LITIGATION MATTERS (CONTINUED)
smelter's operations, primarily for closure obligations. However, the EPA
recently published a proposed rule, which, if adopted, would require this slag
to be managed as a hazardous waste. Certain other waste materials, including
baghouse dust, generated at the smelter and now recycled in the smelter may also
become regulated as hazardous wastes. At this time, the Company cannot predict
the final outcome of the EPA's proposed rule. However, the EPA has indicated,
notwithstanding the full RCRA requirements, the rule will not be imposed, in
particular, that the slag will not be regulated. If the slag or other wastes at
the smelter were to be regulated as hazardous waste, the Company may be required
to take corrective action under RCRA at the smelter, as well as to adopt
stricter management practices for these wastes.
 
    The Company is working with regulators at the Herculaneum smelter to develop
a new three-year compliance plan to meet the ambient air quality standard for
lead promulgated under the federal Clean Air Act. The plan will take effect
after fiscal 1998 to implement control measures identified in the plan. The
Company expects to make capital expenditures for additional control measures
totaling approximately $2,800 for fiscal 1998 while the plan is developed and
anticipates future cash requirements of $3,000 for the three-year plan.
 
    Doe Run has received notice that it is a potentially responsible party
("PRP") subject to liability under the Comprehensive Environmental Response,
Compensation and Liability Act of 1980, as amended ("CERCLA"), at four sites in
St. Francois County, Missouri: the Big River Mine Tailings Site, the Bonne Terre
Site, the Federal site, and the National site; the Oronogo-Durenweg site in
Jasper County, Missouri; the Cherokee County site in Cherokee County, Kansas;
the Tar Creek site in Ottawa County, Oklahoma; the Block "P" site in Cascade
County, Montana; and the Missouri Electric Works site in Cape Girardeau,
Missouri. In addition, there are four sites in St. Francois County for which the
EPA has indicated it will issue notice. These sites involve historical
operations of predecessors of the Company. CERCLA provides for strict and, in
certain circumstances, joint and several liability for response costs and
natural resource damages. Doe Run signed a voluntary Administrative Order of
Consent ("AOC") in 1994 with the EPA to remediate the Big River Mine Tailings
Site. In February 1997, Doe Run signed an AOC to perform an Engineering
Evaluation/Cost Analysis on the Bonne Terre Site. In addition to remediating the
mine waste areas at these sites, the Company has signed an AOC with the EPA to
conduct a Remedial Investigation/ Feasibility Study ("RIFS") to assess potential
off-site impacts of site operations on and the need for remediation regarding
groundwater, residential soils, several creeks and a river. The RIFS is being
conducted by a third party and is approximately one-third complete, with
completion expected within one year. The Block "P" site in Montana was a
polymetallic mine with a waste facility located on U.S. Forest Service land.
Studies of the tailings site, mine and the potential impacts on surface water
have been requested by the State of Montana. The Company has a reserve as of
October 31, 1997 of approximately $17,800 for these sites, including the four
additional sites in St. Francois County.
 
    The Company has been advised by the EPA that it is considering taking
certain response actions at a mine site in Madison County, Missouri known as the
LaMotte Site. A predecessor of the Company was a former operator of the site.
The EPA has not decided whether any action will be taken, but held a meeting
with the Company and two other PRPs at the site on June 17, 1998 to discuss
possible future response actions. This site is substantially smaller than the
sites in St. Francois County where the Company has been named a PRP, and the
potential issues are less complex. At this time, based on this preliminary
meeting and an inspection of the site, management does not believe that any
future action will result in a material adverse impact to the results of
operations, financial condition and liquidity of the Company.
 
                                      F-26
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(14) ENVIRONMENTAL AND LITIGATION MATTERS (CONTINUED)
    Doe Run's recycling facility is subject to corrective action requirements
under RCRA, as a result of a storage permit for certain wastes issued in 1989.
This has required and may involve future remediation of solid waste management
units at the site. Although it is not possible to predict whether completed
actions will be approved or new actions required, the Company has reserves as of
October 31, 1997 of approximately $1,900 for future corrective actions and
$2,600 for closure costs for the permitted storage area.
 
    The Company's domestic operating facilities have wastewater discharge
permits issued under the federal Clean Water Act, as amended. It is expected
that stricter discharge limits than previously in effect will be included in
permits now subject to renewal. As a result, there will be additional treatment
facilities required, with anticipated total capital expenditures of $4,000 over
the next five years to meet applicable permit requirements. There will be no
appreciable increase in operating costs.
 
    The Company's mining and milling operations include five mine waste disposal
facilities that are subject to Missouri mine closure permit requirements. The
total expected cost of closure is $11,000. The Company has begun certain closure
requirements ahead of closure and is also accruing for the cost of ultimate
closure at a rate of approximately $300 per year. The Company's mine closure
reserves were approximately $4,800 as of October 31, 1997.
 
    FOREIGN OPERATIONS
 
    Doe Run Peru has negotiated a capital spending plan with the Peruvian
government to invest $107,575 during the next nine years to meet its obligations
under the Programa de Adecuacion y Manejo Ambiental (Environmental Adjustment
and Management Program) (the "PAMA") as follows:
 
<TABLE>
<CAPTION>
                                                                                    ESTIMATED
YEAR                                                                                  COSTS
- ----------------------------------------------------------------------------------  ----------
<S>                                                                                 <C>
1998..............................................................................  $    2,700
1999..............................................................................       3,612
2000..............................................................................       4,963
2001..............................................................................       3,300
2002..............................................................................       3,000
2003..............................................................................       3,800
2004..............................................................................       2,775
2005..............................................................................      38,700
2006..............................................................................      44,725
                                                                                    ----------
                                                                                    $  107,575
                                                                                    ----------
                                                                                    ----------
</TABLE>
 
    According to the Contract, the Company has the option to continue the use of
Doe Run Peru's existing zinc ferrite disposal site for three years, after which
it can take ownership of the site or create a new site. If the Company chooses
to take ownership of the site, it will be responsible for its closure costs. The
Company has accrued for management's estimate of the closure costs, or $7,200.
If the Company abandons the ferrite site, it must pay this amount to Centromin
Peru S.A.
 
    CONSOLIDATED
 
    The Company believes its reserves for domestic and foreign environmental and
reclamation matters are adequate, based on the information available. Depending
upon the type and extent of remediation activities required, costs in excess of
established reserves are reasonably possible. Therefore, there can be
 
                                      F-27
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(14) ENVIRONMENTAL AND LITIGATION MATTERS (CONTINUED)
no assurance that additional costs, both individually and in the aggregate,
would not have a material adverse effect on the results of operations, financial
condition and liquidity of the Company.
 
    LITIGATION
 
    The Company is a defendant in several lawsuits alleging certain damages
stemming from the operations at the Herculaneum smelter. Two of these cases are
class action lawsuits. In one case, the plaintiffs seek to have certified two
separate classes. The first class would consist of property owners in a certain
section of Herculaneum, alleging that property values have been damaged due to
the operations of the smelter. The second class alleged is comprised of children
who lived in Herculaneum during a period of time when they were six months to
six years old, and the remedy sought is medical monitoring for the class. The
second class action similarly is seeking certification of a class of property
owners allegedly damaged by operations from the smelter, but the purported size
of the class is every home in Herculaneum, Missouri. The other two cases are
personal injury actions by fourteen individuals who allege damages from the
effects of lead poisoning due to operations at the smelter. Punitive damages
also are being sought in each case. The Company is vigorously defending all of
these claims. Preliminary investigation and research by the Company indicates
property values in Herculaneum are consistent with those of surrounding
communities and have not been affected by the smelter. Finally, based on rules
for class certification, the Company believes class certification is not
appropriate. However, because the cases are in the early stages of discovery,
the Company is unable at this time to state with certainty the expected outcome
of and the final costs of any of these cases. Therefore, there can be no
assurance that these cases would not have a material adverse effect, both
individually and in the aggregate, on the results of operations, financial
condition and liquidity of the Company.
 
(15) SUBSEQUENT EVENTS
 
    On March 12, 1998, the Company completed the sale of $200,000 11.25% Senior
Notes due 2005 (the "Fixed Rate Notes") and $55,000 Floating Interest Rate
Senior Notes due 2003 (collectively, the "Notes"). The Notes are guaranteed by
certain subsidiaries of the Company (see Note 16). The Company used $125,000 of
the proceeds from the Notes to make a deposit (the "Special Term Deposit") in a
bank, which in turn loaned such amount (the "Back-to-Back Loan") to Doe Run
Mining. The Special Term Deposit and the Back-to-Back Loan have payment terms
that match the timing and amount of the payments on $125,000 of the Fixed Rate
Notes, except that additional interest of 0.50% for the first six months and
0.25% thereafter through September 11, 2004 is payable on the Back-to-Back Loan.
The Back-to-Back Loan is collateralized by the Special Term Deposit. Doe Run
Mining used the proceeds of the Back-to-Back Loan to repay the $100,000 balance
on the $225,000 term loan, plus accrued interest thereon of $1,004, repay the
$23,000 subordinated note to the Company and pay fees of $313.
 
    The remaining $130,000 of the proceeds of the Notes, plus the $23,000
repayment of the subordinated note by Doe Run Mining, were used by the Company
to: (i) repay principal and interest on the $130,000 term loan of $128,125 and
$1,127, respectively, (ii) repay the revolving loan balance of $14,444, (iii)
pay Renco $5,000 to redeem the $2,500 preferred stock, plus accrued dividends
thereon of $189, and a transaction fee of $2,311 and (iv) pay related fees and
expenses of $6,553.
 
    As a result of these transactions, the Company recognized an extraordinary
loss of approximately $6,607, net of income tax benefit of $143.
 
                                      F-28
<PAGE>
                       THE DOE RUN RESOURCES CORPORATION
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(16) GUARANTOR SUBSIDIARIES
 
   
    The Guarantor Subsidiaries (Fabricated Products, Inc. ("FPI") and Doe Run
Cayman and its subsidiaries, Doe Run Mining S.R. Ltda. ("Doe Run Mining") and
Doe Run Peru) have jointly and severally, fully and unconditionally guaranteed
the Notes. Each of the Guarantor Subsidiaries is a wholly owned direct or
indirect subsidiary of the Company, except Doe Run Peru which is over 99.97%
owned indirectly by the Company, with a de minimis number of shares owned by
employees of Centromin pursuant to Peruvian law. Financial information regarding
the Guarantor Subsidiaries as of October 31, 1997 and April 30, 1998, the year
ended October 31, 1997 and the six months ended April 30, 1998 is presented
below for purposes of complying with the reporting requirements of the Guarantor
Subsidiaries. FPI was incorporated in August 1996, and its operations were not
material to the results of operations of the Company for the year ended October
31, 1996. The results of operations of Doe Run Peru for the eight day period
from October 24 to October 31, 1997 were not material to results of operations
of the Company for the year ended October 31, 1997.
    
 
                                      F-29
<PAGE>
(16) GUARANTOR SUBSIDIARIES (CONTINUED)
 
                          CONSOLIDATING BALANCE SHEETS
                                OCTOBER 31, 1997
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
   
<TABLE>
<CAPTION>
                                          THE COMPANY
                                           EXCLUDING                DOE RUN CAYMAN
                                           GUARANTOR               AND WHOLLY-OWNED    DOE RUN
                                         SUBSIDIARIES      FPI        SUBSIDIARY         PERU     ELIMINATIONS   THE COMPANY
                                         -------------  ---------  -----------------  ----------  ------------  -------------
<S>                                      <C>            <C>        <C>                <C>         <C>           <C>
                                                           ASSETS
Current assets:
  Cash.................................   $     1,579   $  --         $     2,351     $    5,013   $   --        $     8,943
  Trade accounts receivable, net of
    allowance for doubtful accounts....        46,016       6,416         --                 390         (352)        52,470
  Inventories..........................        27,597       2,104         --              59,032          (85)        88,648
  Prepaid expenses and other current
    assets.............................         2,272         239             183          2,569       --              5,263
  Due from subsidiaries................        29,878      --                  78         --          (29,956)       --
  Due from parent......................       --           --             --             125,000     (125,000)       --
  Net deferred tax assets..............       --           --                 (91)           160       --                 69
                                         -------------  ---------  -----------------  ----------  ------------  -------------
    Total current assets...............       107,342       8,759           2,521        192,164     (155,393)       155,393
 
Property, plant and equipment, net.....       104,822       3,787         --              97,739       --            206,348
Net deferred tax assets................         7,481      --             --              --           --              7,481
Other noncurrent assets, net...........        11,260         335           3,623         --           --             15,218
Investment in subsidiaries.............         4,000      --             247,817         --         (251,817)       --
                                         -------------  ---------  -----------------  ----------  ------------  -------------
    Total assets.......................   $   234,905   $  12,881     $   253,961     $  289,903   $ (407,210)   $   384,440
                                         -------------  ---------  -----------------  ----------  ------------  -------------
                                         -------------  ---------  -----------------  ----------  ------------  -------------
                                            LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
  Current maturities of long-term
    debt...............................   $     8,345   $  --         $     4,000     $   --       $   --        $    12,345
  Accounts payable.....................        15,583       2,704         --              23,151         (352)        41,086
  Accrued liabilities..................        18,510         383             625          9,375       --             28,893
  Net deferred tax liabilities.........         7,481      --             --              --           --              7,481
  Due to subsidiaries..................       --           --             125,000         --         (125,000)       --
  Due to parent........................       --           --              23,607          1,214      (24,821)       --
                                         -------------  ---------  -----------------  ----------  ------------  -------------
    Total current liabilities..........        49,919       3,087         153,232         33,740     (150,173)        89,805
Long-term debt, less current
  maturities...........................       123,395      --              99,000         --           --            222,395
Postretirement benefits................        12,455      --             --              --           --             12,455
Reclamation and environmental costs....        24,485      --             --               7,200       --             31,685
Due to parent..........................       --            5,135         --              --           (5,135)       --
Other noncurrent liabilities...........        10,392       2,388         --               1,146       --             13,926
                                         -------------  ---------  -----------------  ----------  ------------  -------------
    Total liabilities..................       220,646      10,610         252,232         42,086     (155,308)       370,266
 
Shareholders' equity:
  Preferred stock, $1,000 par value,
    2,500 shares issued, authorized and
    outstanding; liquidation and
    redemption value of $2,618 on
    October 31, 1997...................         2,500      --             --              --           --              2,500
  Common stock, $.10 par value, 1,000
    shares authorized, issued, and
    outstanding........................       --           --             --              --           --            --
  Common stock, $1 par value, 1,000
    shares authorized, issued and
    outstanding........................       --                1         --              --               (1)       --
  Common stock, $1 par value, 2,005,000
    shares authorized, issued and
    outstanding........................       --           --               2,005         --           (2,005)       --
  Common stock, one nuevos soles par
    value, 648,672,941 shares
    authorized, issued and
    outstanding........................       --           --             --             247,926     (247,926)       --
  Additional paid in capital...........         5,000         935         --              --             (935)         5,000
  Retained earnings....................         6,759       1,335            (276)          (109)      (1,035)         6,674
                                         -------------  ---------  -----------------  ----------  ------------  -------------
    Total shareholders' equity.........        14,259       2,271           1,729        247,817     (251,902)        14,174
                                         -------------  ---------  -----------------  ----------  ------------  -------------
    Total liabilities and shareholders'
    equity.............................   $   234,905   $  12,881     $   253,961     $  289,903   $ (407,210)   $   384,440
                                         -------------  ---------  -----------------  ----------  ------------  -------------
                                         -------------  ---------  -----------------  ----------  ------------  -------------
</TABLE>
    
 
                                      F-30
<PAGE>
(16) GUARANTOR SUBSIDIARIES (CONTINUED)
 
                     CONSOLIDATING STATEMENTS OF OPERATIONS
 
                          YEAR ENDED OCTOBER 31, 1997
 
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                          THE COMPANY
                                           EXCLUDING
                                           GUARANTOR                  DOE RUN CAYMAN
                                         SUBSIDIARIES       FPI      AND SUBSIDIARIES  ELIMINATIONS   THE COMPANY
                                         -------------  -----------  ----------------  ------------  -------------
<S>                                      <C>            <C>          <C>               <C>           <C>
Net sales..............................   $   257,243    $  23,338      $    2,571      $   (2,685)   $   280,467
 
Costs and expenses:
  Cost of sales........................       214,742       20,194           2,027          (2,612)       234,351
  Depletion, depreciation and
    amortization.......................        14,091          476             151          --             14,718
  Selling, general and administrative
    expenses, including related party
    management fees of $1,200 per
    year...............................        10,005          920              34          --             10,959
  Exploration expense..................         2,705       --              --              --              2,705
                                         -------------  -----------        -------     ------------  -------------
      Total costs and expenses.........       241,543       21,590           2,212          (2,612)       262,733
                                         -------------  -----------        -------     ------------  -------------
 
      Income from operations...........        15,700        1,748             359             (73)        17,734
 
Other income (expense):
  Interest expense.....................       (13,038)        (445)           (257)         --            (13,740)
  Interest income......................            21       --              --              --                 21
  Other, net...........................           127         (136)            (28)         --                (37)
  Equity in earnings of subsidiaries...           887       --              --                (887)       --
                                         -------------  -----------        -------     ------------  -------------
                                              (12,003)        (581)           (285)           (887)       (13,756)
                                         -------------  -----------        -------     ------------  -------------
 
      Income before income taxes.......         3,697        1,167              74            (960)         3,978
Income tax expense.....................         3,977            4             350          --              4,331
                                         -------------  -----------        -------     ------------  -------------
 
      Income before extraordinary
        item...........................          (280)       1,163            (276)           (960)          (353)
 
                                               (1,062)      --              --              --             (1,062)
                                         -------------  -----------        -------     ------------  -------------
      Net income (loss)................   $    (1,342)   $   1,163      $     (276)     $     (960)   $    (1,415)
                                         -------------  -----------        -------     ------------  -------------
                                         -------------  -----------        -------     ------------  -------------
</TABLE>
 
                                      F-31
<PAGE>
(16) GUARANTOR SUBSIDIARIES (CONTINUED)
 
                CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
 
                          YEAR ENDED OCTOBER 31, 1997
 
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                             THE COMPANY
                                              EXCLUDING
                                              GUARANTOR                DOE RUN CAYMAN
                                            SUBSIDIARIES      FPI     AND SUBSIDIARIES  ELIMINATIONS    THE COMPANY
                                            -------------  ---------  ----------------  -------------  -------------
<S>                                         <C>            <C>        <C>               <C>            <C>
Net cash provided by operating
  activities..............................   $    12,040   $   1,585     $    4,395       $  --         $    18,020
Cash flows from investing activities:
  Purchases of property, plant and
    equipment.............................       (12,414)       (933)          (129)         --             (13,476)
  Payment for acquisitions................        (5,227)     --           (123,015)         --            (128,242)
  Investment in subsidiary................        (2,005)     --             --               2,005         --
                                            -------------  ---------       --------          ------    -------------
    Net cash used in investing
      activities..........................       (19,646)       (933)      (123,144)          2,005        (141,718)
Cash flows from financing activities:
  Proceeds from (payments on) revolving
    loan, net.............................        (9,399)     --              3,000          --              (6,399)
  Proceeds from long-term debt............       140,945      --            225,000          --             365,945
  Payments on long-term debt..............       (87,453)     --           (125,000)         --            (212,453)
  Payment of deferred financing costs.....        (4,938)     --             (3,635)         --              (8,573)
  Loans from parent.......................       (24,091)       (652)        24,743          --             --
  Extraordinary item related to retirement
    of debt...............................          (638)     --             --              --                (638)
  Cash received from issuance of stock....       --           --              2,005          (2,005)        --
  Payment of dividends....................        (5,241)     --             --              --              (5,241)
                                            -------------  ---------       --------          ------    -------------
    Net cash provided by (used in)
      financing activities................         9,185        (652)       126,113          (2,005)        132,641
                                            -------------  ---------       --------          ------    -------------
    Net increase in cash..................         1,579      --              7,364          --               8,943
Cash at beginning of period...............       --           --             --              --             --
                                            -------------  ---------       --------          ------    -------------
Cash at end of period.....................   $     1,579   $  --         $    7,364       $  --         $     8,943
                                            -------------  ---------       --------          ------    -------------
                                            -------------  ---------       --------          ------    -------------
</TABLE>
 
                                      F-32
<PAGE>
(16) GUARANTOR SUBSIDIARIES (CONTINUED)
 
                          CONSOLIDATING BALANCE SHEETS
 
                        AS OF APRIL 30, 1998 (UNAUDITED)
 
                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
   
<TABLE>
<CAPTION>
                                                  THE COMPANY
                                                   EXCLUDING                 DOE RUN CAYMAN
                                                   GUARANTOR                AND WHOLLY-OWNED     DOE RUN
                                                 SUBSIDIARIES       FPI        SUBSIDIARY         PERU      ELIMINATIONS
                                                ---------------  ---------  -----------------  -----------  ------------
<S>                                             <C>              <C>        <C>                <C>          <C>
                                                         ASSETS
Current assets:
  Cash........................................     $  --         $  --          $   3,040       $   9,102    $   --
  Trade accounts receivable, net of allowances
    for doubtful accounts.....................        38,599         4,594         --              23,767           (33)
  Inventories.................................        34,509         2,167         --              64,308          (117)
  Prepaid expenses and other current assets...         7,097           188          4,794          22,593        (5,129)
  Due from subsidiary.........................        19,989        --              3,133          --           (23,122)
  Due from parent.............................        --            --             --             136,315      (136,315)
                                                ---------------  ---------       --------      -----------  ------------
    Total current assets......................       100,194         6,949         10,967         256,085      (164,716)
 
Property, plant and equipment, net............       103,283         6,663         --              95,921        --
Special term deposit..........................       125,000        --             --              --            --
Net deferred tax assets.......................         9,761        --             --                (616)       --
Other noncurrent assets, net..................        16,637           440            310          --            --
Investment in subsidiaries....................        14,007        --            266,351          --          (280,358)
                                                ---------------  ---------       --------      -----------  ------------
    Total assets..............................     $ 368,882     $  14,052      $ 277,628       $ 351,390    $ (445,074)
                                                ---------------  ---------       --------      -----------  ------------
                                                ---------------  ---------       --------      -----------  ------------
 
                                          LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
  Short-term borrowings and current maturities
    of long-term debt.........................     $     895     $  --          $  --           $   5,000    $   --
  Accounts payable............................        10,276         1,809         --              38,673           (33)
  Accrued liabilities.........................        27,167           270          3,732          16,743        (5,129)
Net deferred tax liabilities..................         7,833        --             --               1,634        --
  Due to subsidiaries.........................        --            --            136,315          --          (136,315)
  Due to parent...............................        --             8,582         --              14,540       (23,122)
                                                ---------------  ---------       --------      -----------  ------------
    Total current liabilities.................        46,171        10,661        140,047          76,590      (164,599)
Long-term debt, less current maturities.......       259,681        --            125,000          --            --
Postretirement benefits.......................        12,608        --             --              --            --
Reclamation and environmental costs...........        23,885        --             --               7,200        --
Other noncurrent liabilities..................        10,544         1,965         --               1,249        --
                                                ---------------  ---------       --------      -----------  ------------
    Total liabilities.........................       352,889        12,626        265,047          85,039      (164,599)
 
Shareholders' equity:
  Common stock, $.10 par value, 1,000 shares
    authorized, issued, and outstanding.......        --                 0         --              --            --
  Common stock, $1 par value, 1,000 shares
    authorized, issued and outstanding........        --                 1         --              --                (1)
  Common stock, $1 par value, 2,005,000 shares
    authorized, issued and
    outstanding...............................        --            --              2,005          --            (2,005)
  Common stock, one nuevos soles par value,
    648,672,941 shares authorized, issued and
    outstanding...............................        --            --             --             247,926      (247,926)
  Additional paid in capital..................         5,000           935         --              --              (935)
  Retained earnings...........................        10,993           490         10,576          18,425       (29,608)
                                                ---------------  ---------       --------      -----------  ------------
    Total shareholders' equity................        15,993         1,426         12,581         266,351      (280,475)
                                                ---------------  ---------       --------      -----------  ------------
    Total liabilities and shareholders'
      equity..................................     $ 368,882     $  14,052      $ 277,628       $ 351,390    $ (445,074)
                                                ---------------  ---------       --------      -----------  ------------
                                                ---------------  ---------       --------      -----------  ------------
 
<CAPTION>
 
                                                 THE COMPANY
                                                -------------
<S>                                             <C>
 
Current assets:
  Cash........................................    $  12,142
  Trade accounts receivable, net of allowances
    for doubtful accounts.....................       66,927
  Inventories.................................      100,867
  Prepaid expenses and other current assets...       29,543
  Due from subsidiary.........................       --
  Due from parent.............................       --
                                                -------------
    Total current assets......................      209,479
Property, plant and equipment, net............      205,867
Special term deposit..........................      125,000
Net deferred tax assets.......................        9,145
Other noncurrent assets, net..................       17,387
Investment in subsidiaries....................       --
                                                -------------
    Total assets..............................    $ 566,878
                                                -------------
                                                -------------
                                          LIAB
Current liabilities:
  Short-term borrowings and current maturities
    of long-term debt.........................    $   5,895
  Accounts payable............................       50,725
  Accrued liabilities.........................       42,783
Net deferred tax liabilities..................        9,467
  Due to subsidiaries.........................       --
  Due to parent...............................       --
                                                -------------
    Total current liabilities.................      108,870
Long-term debt, less current maturities.......      384,681
Postretirement benefits.......................       12,608
Reclamation and environmental costs...........       31,085
Other noncurrent liabilities..................       13,758
                                                -------------
    Total liabilities.........................      551,002
Shareholders' equity:
  Common stock, $.10 par value, 1,000 shares
    authorized, issued, and outstanding.......       --
  Common stock, $1 par value, 1,000 shares
    authorized, issued and outstanding........       --
  Common stock, $1 par value, 2,005,000 shares
    authorized, issued and
    outstanding...............................       --
  Common stock, one nuevos soles par value,
    648,672,941 shares authorized, issued and
    outstanding...............................       --
  Additional paid in capital..................        5,000
  Retained earnings...........................       10,876
                                                -------------
    Total shareholders' equity................       15,876
                                                -------------
    Total liabilities and shareholders'
      equity..................................    $ 566,878
                                                -------------
                                                -------------
</TABLE>
    
 
                                      F-33
<PAGE>
(16) GUARANTOR SUBSIDIARIES (CONTINUED)
 
                     CONSOLIDATING STATEMENTS OF OPERATIONS
 
                  SIX MONTHS ENDED APRIL 30, 1998 (UNAUDITED)
 
                             (DOLLARS IN THOUSANDS)
   
<TABLE>
<CAPTION>
                                              THE COMPANY
                                               EXCLUDING                  DOE RUN CAYMAN
                                               GUARANTOR                 AND WHOLLY-OWNED      DOE RUN
                                             SUBSIDIARIES       FPI         SUBSIDIARY          PERU      ELIMINATIONS
                                            ---------------  ---------  -------------------  -----------  ------------
<S>                                         <C>              <C>        <C>                  <C>          <C>
Net sales.................................     $ 119,006     $   7,827       $   2,000        $ 227,359    $  (12,787)
Costs and expenses:
    Cost of sales.........................        97,090         7,322          --              181,631        (2,938)
    Depletion, depreciation and
      amortization........................         7,786           279          --                3,396        --
    Selling, general and administrative
      expenses............................         7,935           712             740           18,130        (9,817)
    Exploration expenses..................         1,599        --              --               --            --
                                            ---------------  ---------         -------       -----------  ------------
      Total costs and expenses............       114,410         8,313             740          203,157       (12,755)
                                            ---------------  ---------         -------       -----------  ------------
      Income (loss) from operations.......         4,596          (486)          1,260           24,202           (32)
 
Other income (expense):
    Interest expense......................        (8,838)         (311)         (5,632)             (35)          311
    Interest income.......................         2,214        --              --                  456          (311)
    Other, net............................          (241)          (32)           (941)             579        --
    Equity in earnings of subsidiaries....        10,007        --              18,534           --           (28,541)
                                            ---------------  ---------         -------       -----------  ------------
                                                   3,142          (343)         11,961            1,000       (28,541)
                                            ---------------  ---------         -------       -----------  ------------
      Income (loss) before income taxes
        and extraordinary item............         7,738          (829)         13,221           25,202       (28,573)
Income tax expense (benefit)..............          (923)           16          --                6,668        --
                                            ---------------  ---------         -------       -----------  ------------
    Income (loss) before extraordinary
      item................................         8,661          (845)         13,221           18,534       (28,573)
    Extraordinary item....................        (4,238)       --              (2,369)          --            --
                                            ---------------  ---------         -------       -----------  ------------
      Net income (loss)...................     $   4,423     $    (845)      $  10,852        $  18,534    $  (28,573)
                                            ---------------  ---------         -------       -----------  ------------
                                            ---------------  ---------         -------       -----------  ------------
 
<CAPTION>
 
                                             THE COMPANY
                                            -------------
<S>                                         <C>
Net sales.................................    $ 343,405
Costs and expenses:
    Cost of sales.........................      283,105
    Depletion, depreciation and
      amortization........................       11,461
    Selling, general and administrative
      expenses............................       17,700
    Exploration expenses..................        1,599
                                            -------------
      Total costs and expenses............      313,865
                                            -------------
      Income (loss) from operations.......       29,540
Other income (expense):
    Interest expense......................      (14,505)
    Interest income.......................        2,359
    Other, net............................         (635)
    Equity in earnings of subsidiaries....       --
                                            -------------
                                                (12,781)
                                            -------------
      Income (loss) before income taxes
        and extraordinary item............       16,759
Income tax expense (benefit)..............        5,761
                                            -------------
    Income (loss) before extraordinary
      item................................       10,998
    Extraordinary item....................       (6,607)
                                            -------------
      Net income (loss)...................    $   4,391
                                            -------------
                                            -------------
</TABLE>
    
 
                                      F-34
<PAGE>
(16) GUARANTOR SUBSIDIARIES (CONTINUED)
 
                CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
 
                  SIX MONTHS ENDED APRIL 30, 1998 (UNAUDITED)
 
                             (DOLLARS IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                             THE COMPANY
                                              EXCLUDING                 DOE RUN CAYMAN
                                              GUARANTOR                AND WHOLLY-OWNED     DOE RUN
                                            SUBSIDIARIES       FPI        SUBSIDIARY         PERU      ELIMINATIONS   THE COMPANY
                                           ---------------  ---------  -----------------  -----------  ------------  -------------
<S>                                        <C>              <C>        <C>                <C>          <C>           <C>
Net cash provided by (used in) operating
  activities.............................     $  15,626     $    (324)     $  (7,663)      $     625    $  (10,007)   $    (1,743)
Cash flows from investing activities:
    Special term deposit.................      (125,000)       --             --              --            --           (125,000)
    Purchases of property, plant and
      equipment..........................        (6,248)       (3,124)        --              (1,536)       --            (10,908)
    Investment in subsidiary.............       (10,007)       --             --              --            10,007        --
                                           ---------------  ---------       --------      -----------  ------------  -------------
    Net cash used in investing
      activities.........................      (141,255)       (3,124)        --              (1,536)       10,007       (135,908)
 
Cash flows from financing activities:
    Proceeds from (payments on) revolving
      loan, net..........................         4,681        --             (3,000)         --            --              1,681
    Proceeds from short-term
      borrowings.........................        --            --             --               5,000        --              5,000
    Proceeds from long-term debt.........       255,000        --            125,000          --            --            380,000
    Payments on long-term debt...........      (130,845)       --           (100,000)         --            --           (230,845)
    Payment of deferred financing
      costs..............................       (11,985)       --               (312)         --            --            (12,297)
    Loan from parent.....................         9,888         3,448        (13,336)         --            --            --
    Payment of dividends.................          (189)       --             --              --            --               (189)
    Redemption of preferred stock........        (2,500)       --             --              --            --             (2,500)
                                           ---------------  ---------       --------      -----------  ------------  -------------
    Net cash provided by financing
      activities.........................       124,050         3,448          8,352           5,000        --            140,850
                                           ---------------  ---------       --------      -----------  ------------  -------------
    Net increase (decrease) in cash......        (1,579)       --                689           4,089        --              3,199
 
Cash at beginning of period..............         1,579        --              2,351           5,013        --              8,943
                                           ---------------  ---------       --------      -----------  ------------  -------------
Cash at end of period....................     $  --         $  --          $   3,040       $   9,102    $   --        $    12,142
                                           ---------------  ---------       --------      -----------  ------------  -------------
                                           ---------------  ---------       --------      -----------  ------------  -------------
</TABLE>
    
 
                                      F-35
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Shareholders of
    DOE RUN PERU S.R. LTDA.:
 
    We have audited the accompanying consolidated balance sheet of DOE RUN PERU
S.R. LTDA. (a Peruvian company) as of October 31, 1997 and the related
consolidated statements of income, changes in shareholders' equity and cash
flows for the period from October 23, 1997 (inception date) to October 31, 1997.
These consolidated financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these consolidated
financial statements based on our audit.
 
    We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statements presentation.
We believe that our audit provides a reasonable basis for our opinion.
 
    In our opinion, the consolidated financial statements referred to above,
present fairly, in all material respects, the consolidated financial position of
DOE RUN PERU S.R. LTDA. as of October 31, 1997 and its consolidated results of
operations and cash flows for the period from October 23, 1997 (inception date)
to October 31, 1997, in conformity with accounting principles generally accepted
in the United States of America.
 
                                          MEDINA, ZALDIVAR Y ASOCIADOS
                                          a member firm of Andersen Worldwide SC
 
Countersigned by:
 
Marco Antonio Zaldivar
C.P.C. Register 12477
 
Lima, Peru
December 5, 1997
 
                                      F-36
<PAGE>
   
                             DOE RUN PERU S.R. LTDA
    
 
   
                           CONSOLIDATED BALANCE SHEET
    
 
   
                             AS OF OCTOBER 31, 1997
    
 
   
                         (IN THOUSANDS OF U.S. DOLLARS)
    
 
   
<TABLE>
<S>                                                                                 <C>
                                           ASSETS
CURRENT ASSETS:
  Cash............................................................................  $   5,013
  Trade accounts receivable.......................................................        390
  Inventory.......................................................................     59,032
  Prepaid expenses and other assets...............................................      2,729
                                                                                    ---------
    Total current assets..........................................................     67,164
DUE FROM SHAREHOLDER..............................................................    125,000
PROPERTY, PLANT AND EQUIPMENT, net................................................     97,739
                                                                                    ---------
    Total assets..................................................................  $ 289,903
                                                                                    ---------
                                                                                    ---------
                            LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES:
  Trade accounts payable..........................................................  $  23,151
  Accrued liabilities.............................................................      9,375
  Due to related party............................................................      1,214
                                                                                    ---------
    Total current liabilities.....................................................     33,740
LONG-TERM LIABILITIES.............................................................      8,346
                                                                                    ---------
    Total liabilities.............................................................     42,086
                                                                                    ---------
SHAREHOLDERS' EQUITY
  Capital stock...................................................................    247,926
  Retained loss...................................................................       (109)
                                                                                    ---------
    Total shareholders' equity....................................................    247,817
                                                                                    ---------
    Total liabilities and shareholders' equity....................................  $ 289,903
                                                                                    ---------
                                                                                    ---------
</TABLE>
    
 
   
       The accompanying notes are an integral part of this balance sheet.
    
 
                                      F-37
<PAGE>
   
                             DOE RUN PERU S.R.LTDA.
    
 
   
                        CONSOLIDATED STATEMENT OF INCOME
    FOR THE PERIOD FROM OCTOBER 23, 1997 (INCEPTION DATE) TO OCTOBER 31,1997
                         (IN THOUSANDS OF U.S. DOLLARS)
    
 
   
<TABLE>
<S>                                                                                   <C>
NET SALES...........................................................................  $   2,571
                                                                                      ---------
OPERATING COSTS AND EXPENSES:
  Costs of sales....................................................................      2,048
  Depreciation expense..............................................................        151
  Administrative and general expenses...............................................         32
                                                                                      ---------
                                                                                          2,231
                                                                                      ---------
    Operating income................................................................        340
 
OTHER EXPENSES:
  Exchange loss.....................................................................         28
                                                                                      ---------
    Income before provision for
      income tax....................................................................        312
 
PROVISION FOR INCOME TAX............................................................        421
                                                                                      ---------
    Net loss........................................................................  $    (109)
                                                                                      ---------
                                                                                      ---------
</TABLE>
    
 
   
    The accompanying notes are an integral part of this financial statement.
    
 
                                      F-38
<PAGE>
   
                             DOE RUN PERU S.R.LTDA.
    
 
   
           CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY
    FOR THE PERIOD FROM OCTOBER 23, 1997 (INCEPTION DATE) TO OCTOBER 31,1997
                         (IN THOUSANDS OF U.S. DOLLARS)
    
 
   
<TABLE>
<CAPTION>
                                                                                              CAPITAL     RETAINED
                                                                                               STOCK        LOSS
                                                                                             ----------  -----------
<S>                                                                                          <C>         <C>
Capital contributions......................................................................  $  247,924   $  --
Net loss...................................................................................      --            (109)
                                                                                             ----------       -----
BALANCE AS OF OCTOBER 31, 1997.............................................................  $  247,924   $    (109)
                                                                                             ----------       -----
                                                                                             ----------       -----
</TABLE>
    
 
   
    The accompanying notes are an integral partof this financial statement.
    
 
                                      F-39
<PAGE>
   
                             DOE RUN PERU S.R.LTDA.
    
 
   
                      CONSOLIDATED STATEMENT OF CASH FLOWS
    
 
   
   FOR THE PERIOD FROM OCTOBER 23, 1997 (INCEPTION DATE) TO OCTOBER 31, 1997
    
 
   
                         (IN THOUSANDS OF U.S. DOLLARS)
    
 
   
<TABLE>
<S>                                                                                 <C>
OPERATING ACTIVITIES:
  Net loss........................................................................  $    (109)
  Add:
    Depreciation..................................................................        151
    Deferred provision of income tax and workers' profit sharing..................          3
  Net changes in assets and liabilities:
    Increase in trade accounts receivable.........................................       (390)
    Increase in inventory.........................................................     (3,465)
    Increase in prepaid expenses and other assets.................................     (1,347)
    Increase in trade accounts payable............................................      5,025
    Increase in accrued liabilities...............................................      3,005
    Increase in long-term liabilities.............................................      1,146
                                                                                    ---------
  Net cash provided by operating activities.......................................      4,019
                                                                                    ---------
INVESTING ACTIVITIES:
  Increase in due from shareholder................................................   (125,000)
  Acquisition of net assets of Metaloroya.........................................   (123,015)
  Additions of property, plant and equipment......................................       (129)
                                                                                    ---------
  Net cash used in investing activities...........................................   (248,144)
                                                                                    ---------
FINANCING ACTIVITIES:
  Capital contributions...........................................................    247,924
  Increase in due to related party................................................      1,214
                                                                                    ---------
  Net cash provided by financing activities.......................................    249,138
                                                                                    ---------
NET INCREASE IN CASH AND DEPOSITS IN BANKS........................................      5,013
CASH AND DEPOSITS IN BANKS AT BEGINNING OF PERIOD.................................     --
                                                                                    ---------
CASH AND DEPOSITS IN BANKS AT END OF PERIOD.......................................  $   5,013
                                                                                    ---------
                                                                                    ---------
</TABLE>
    
 
   
    The accompanying notes are an integral part of this financial statement.
    
 
                                      F-40
<PAGE>
   
                             DOE RUN PERU S.R.LTDA.
    
 
   
                 NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
    
 
   
                             AS OF OCTOBER 31, 1997
    
 
   
1. BUSINESS ACTIVITY AND ACQUISITION
    
 
   
    Doe Run Peru S.R.Ltda. ("Doe Run Peru" or the "Company"), is a Peruvian
Company incorporated on September 8, 1997 and 99.9% owned by Doe Run Mining
S.R.Ltda. On October 23, 1997, Doe Run Peru acquired substantially all of the
outstanding shares of Metaloroya S.A. ("Metaloroya"), a Peruvian company which
was formed for purposes of consummating the sale of certain assets and
liabilities of La Oroya, a division of Centromin Peru S.A. ("CENTROMIN"), an
entity owned by the Peruvian government.
    
 
   
    The acquisition was made through a Contract of Stock Transfer, Capital
Increase and Stock Subscription (the "Contract"), which required a capital
increase in Metaloroya of US$126.5 million in exchange for the 51% for the
shares and a payment of US$121.4 million for the transfer of the remaining 49%.
The acquisition has been accounted for as a purchase and the effective purchase
price of US$123 million, including transaction costs of approximately US$2.5
million, has been allocated to the fair value of the assets acquired and
liabilities assumed. Because of the "bargain purchase" inherent in the
acquisition, the excess of the fair values of the net assets acquired over the
purchase price of approximately US$157 million has been mainly used to reduce
the value of the fixed assets acquired.
    
 
   
    Doe Run Peru and its subsidiary are engaged in the smelting and refining of
polymetalic concentrates, mainly copper, lead and zinc, which are sold as
refined metals primarily to customers located outside of Peru. Substantially all
of the Company's assets and liabilities are denominated in U.S. dollars.
    
 
   
2. BASIS OF PRESENTATION
    
 
   
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities, the
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
    
 
   
    The consolidated financial statements of the Company have been prepared in
accordance with the accounting principles generally accepted in the United
States of America ("U.S. GAAP").
    
 
   
    Unless otherwise indicated, all amounts in the financial statements and in
these notes are presented in thousands of U.S. dollars (US$).
    
 
   
    The consolidated financial statements include all the accounts of the
Company and its subsidiary, after eliminating intercompany balances and
transactions, including gains and losses resulting from such transactions. The
minority interest is not significant and represents a minimal ownership by
Metaloroya's employees.
    
 
   
    Doe Run Peru had no operations prior to the acquisition of Metaloroya.
Accordingly, the accompanying consolidated statements of income and cash flows
reflect the results of operations for the period from October 23, 1997 to
October 31, 1997.
    
 
                                      F-41
<PAGE>
   
                             DOE RUN PERU S.R.LTDA.
    
 
   
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
   
                             AS OF OCTOBER 31, 1997
    
 
   
3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
    
 
   
INVENTORY
    
 
   
    Inventory is stated at the lower of cost or net realizable value. The cost
of refined metals and concentrates for sale, as well as metals and concentrates
in process are determined under the first-in, first-out method (FIFO). Inventory
costs include concentrates purchased, labor, depreciation and other production
costs. The cost of materials, supplies and spare parts are determined using the
average cost method.
    
 
   
PROPERTY, PLANT AND EQUIPMENT
    
 
   
    Property, plant and equipment are stated at cost. Depreciation is calculated
on a straight-line basis at the rates indicated in Note 7. Maintenance and minor
repairs are charged to expenses as incurred. Material improvements and renewals
are capitalized.
    
 
   
REVENUE RECOGNITION
    
 
   
    Sales are recorded when title passes to the customer, which occurs at the
time of shipment. With respect to concentrates, sales are recorded based on
estimated weights, assays and prices. All such concentrate sales are adjusted
when final weights, assays and prices are known. Adjustments to the provisional
billings are made in the period during which additional information becomes
available.
    
 
   
INCOME TAX AND WORKERS' PROFIT SHARING
    
 
   
    Under Statement of Financial Accounting Standard N DEG.109, "Accounting for
Income Taxes" ("SFAS 109"), which designates the liability method as the
required accounting method for taxes under U.S. GAAP, the Company recognizes the
tax effect of the temporary differences between the financial reporting basis of
assets and liabilities and the related tax basis.
    
 
   
    The Company also recognizes the effect of the temporary differences between
book and tax basis of assets and liabilities related to workers' profit sharing
on a basis similar to that used for income tax.
    
 
   
4. REMEASUREMENT INTO U.S. DOLLAR
    
 
   
    The accounting records of Doe Run Peru and Metaloroya, which are kept in
Peruvian nuevos soles, have been re-measured into U. S. dollars, their
functional currency, following the methodology established by SFAS 52:
    
 
   
    (a) Non-monetary accounts have been re-measured at historical exchange
rates.
    
 
   
    (b) Monetary accounts in Peruvian currency have been re-measured at free
market average exchange rate in effect at October 31,1997, which is S/2.71 per
each US$1.
    
 
   
    (c) Income and expenses have been re-measured at the average monthly
exchange rates. Cost of sales was determined from its components once
re-measured. The net effect of foreign exchange difference has been reflected in
the accompanying statement of income.
    
 
                                      F-42
<PAGE>
   
                             DOE RUN PERU S.R.LTDA.
    
 
   
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
   
                             AS OF OCTOBER 31, 1997
    
 
   
5. FOREIGN CURRENCY TRANSACTIONS AND EXCHANGE RISK EXPOSURE
    
 
   
    Under current law, foreign currency transactions are made through the
Peruvian financial banking system at free market exchange rates.
    
 
   
    As of October 31,1997, the assets and liabilities denominated in Peruvian
nuevos soles are as follows (in thousands):
    
 
   
<TABLE>
<S>                                                                  <C>
Assets -
  Prepaid expenses and other assets................................    S/7,396
                                                                     ---------
Liabilities -
    Accrued liabilities............................................      6,229
                                                                     ---------
Net position.......................................................    S/1,167
                                                                     ---------
                                                                     ---------
</TABLE>
    
 
   
    The net effect of exchange differences applicable to the net assets position
denominated in Peruvian nuevos soles was a loss of US$28 for the period from
October 23, 1997 to October 31, 1997, which has been reflected in the
accompanying statement of income.
    
 
   
6. INVENTORY
    
 
   
    Inventory consists of the following as of October 31, 1997:
    
 
   
<TABLE>
<S>                                                                  <C>
Refined metals and concentrates for sale...........................  $   5,324
Metals and concentrates in process.................................     43,188
Materials, supplies and spare parts................................     10,520
                                                                     ---------
                                                                     $  59,032
                                                                     ---------
                                                                     ---------
</TABLE>
    
 
   
7. PROPERTY, PLANT AND EQUIPMENT
    
 
   
    Property, plant and equipment consists of the following as of October 31,
1997:
    
 
   
<TABLE>
<CAPTION>
                                                                     ANNUAL
                                                                  DEPRECIATION
                                                                      RATE
                                                                 ---------------
<S>                                                              <C>              <C>
Land...........................................................        --         $   5,866
Buildings......................................................  5% and 10%          16,619
Machinery and equipment........................................  6.67%               70,388
Transportation units...........................................  33.33%               1,955
Other equipments...............................................  10%                  2,933
Work in progress...............................................        --               129
                                                                                  ---------
                                                                                     97,890
Less--Accumulated depreciation.................................                        (151)
                                                                                  ---------
                                                                                  $  97,739
                                                                                  ---------
                                                                                  ---------
</TABLE>
    
 
                                      F-43
<PAGE>
   
                 NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
    
 
   
                             AS OF OCTOBER 31, 1997
    
 
   
8. ACCRUED LIABILITIES
    
 
   
    Accrued liabilities consists of the following as of October 31, 1997:
    
 
   
<TABLE>
<CAPTION>
Remunerations payable...............................................................  $   3,856
<S>                                                                                   <C>
Taxes payable.......................................................................      1,521
Fees and expenses payable...........................................................      1,286
Severance indemnities...............................................................      1,238
Other...............................................................................      1,476
                                                                                      ---------
                                                                                      $   9,377
                                                                                      ---------
                                                                                      ---------
</TABLE>
    
 
   
    Severance indemnities are determined according to legal regulations and are
provided for on an accrual basis for the amount, which would be paid if all
personnel were to retire at the balance sheet date. Under Legislative Decree
650, liabilities relating to severance indemnities earned currently by employees
are accrued and semi-annually deposited into workers' individual bank accounts
designated by the employees.
    
 
   
9. LONG-TERM LIABILITIES
    
 
   
    Long-term liabilities consists primarily of estimated closure costs of a
zinc ferrite site of US$7.2 million, as explained in Note 12.
    
 
   
10. TAXATION AND WORKERS' PROFIT SHARING
    
 
   
    The Company and its subsidiary are subject to the Peruvian tax regulations.
The statutory income tax rate in Peru is 30% of taxable income.
    
 
   
    Metaloroya has signed a Tax Stabilization Agreement with the Peruvian
Government for a ten- year period effective November 6, 1997. The benefits are
the following:
    
 
   
    - Utilization of the tax rules prevailing on April 25, 1994. In exercise of
      the regulation permitted in the tenth clause of the Tax Stabilization
      Agreement, Metaloroya has adopted the tax rules prevailing on November 6,
      1997.
    
 
   
    - Custom duties will be calculated at rates ranging from 15% to 25%.
    
 
   
    - Free commercialization of its products.
    
 
   
    - No restrictions on the use of proceeds from export sales.
    
 
   
    - Free conversion of foreign currency generated by local sales.
    
 
   
    - No discrimination in foreign currency transactions.
    
 
   
    In accordance with current workers' profit sharing regulations in Peru, the
Company's workers have the right to receive 8 percent of the Company's taxable
income, of which 50 percent is distributed among all employees based on the
number of days worked by each employee and the remaining amount is distributed
in proportion to their salaries. Such profit sharing, which is taxable, is
limited to 18 times the annual salary for each worker. Any excess is to be
reserved and expensed for training of the workers.
    
 
                                      F-44
<PAGE>
   
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
   
                             AS OF OCTOBER 31, 1997
    
 
   
10. TAXATION AND WORKERS' PROFIT SHARING (CONTINUED)
    
   
    The provision for income tax and workers' profit sharing is comprised of the
following for the period from October 23, 1997 to October 31, 1997:
    
 
   
<TABLE>
<CAPTION>
                                                                                                        WORKERS' PROFIT
                                                                                         INCOME TAX         SHARING
                                                                                        -------------  -----------------
 
<S>                                                                                     <C>            <C>
Current provision.....................................................................    $     419        $     121
Deferred provision....................................................................            2                1
                                                                                              -----            -----
    Total.............................................................................    $     421        $     122
                                                                                              -----            -----
                                                                                              -----            -----
</TABLE>
    
 
   
    The effective income tax rate recorded on a U.S. GAAP basis is 135% because
of difference between inflation and devaluation of US$1,002, which is taxable.
    
 
   
11. SHAREHOLDERS' EQUITY
    
 
   
    The capital stock is comprised of 648,672,941 authorized, totally subscribed
and paid-in common shares, with a face value of one Peruvian nuevos soles each.
    
 
   
    Under Peruvian current regulations, there are no restrictions on dividend
remittance abroad or the repatriation of foreign capital. Dividend distribution
is exempt from Peruvian income tax.
    
 
   
12. COMMITMENTS AND CONTINGENCIES
    
 
   
INVESTMENT COMMITMENT
    
 
   
    According to the Contract described in Note 1, Metaloroya is obligated to
invest US$120 million through October 23, 2002 to expand and modernize its
operations, including certain expenditures to comply with environmental
regulations within Peru, as discussed below. In the event that Metaloroya has
not fulfilled its obligations under the investment commitment by the end of
October 23, 2002, it will be obligated to pay in 2002 a penalty to CENTROMIN
equal to 30% of any shortfall.
    
 
   
ENVIRONMENTAL MATTERS
    
 
   
    On October 17, 1997, Metaloroya signed with the Peruvian government an
Administrative Environmental Stabilization Contract, the purpose of which is to
provide environmental stability to resolve the environmental matters included in
the Environmental Protection Adequacy and Management Program (PAMA).
Accordingly, future changes in legal rules and maximum permissible levels would
not affect Metaloroya for ten years from the date of the Contract.
    
 
                                      F-45
<PAGE>
   
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
   
                             AS OF OCTOBER 31, 1997
    
 
   
12. COMMITMENTS AND CONTINGENCIES (CONTINUED)
    
   
    Metaloroya's management estimates that it will invest US$107.6 million
during the next nine years in order to meet its obligations under the PAMA. Also
under this agreement, Metaloroya is obligated to invest a minimum of 1% of
annual sales each year on such commitments. The schedule follows:
    
 
   
<TABLE>
<CAPTION>
                                                                                    ESTIMATED
YEAR                                                                                  COSTS
- ----------------------------------------------------------------------------------  ----------
<S>                                                                                 <C>
1998..............................................................................  $    2,700
1999..............................................................................       3,612
2000..............................................................................       4,963
2001..............................................................................       3,300
2002..............................................................................       3,000
2003..............................................................................       3,800
2004..............................................................................       2,775
2005..............................................................................      38,700
2006..............................................................................      44,725
                                                                                    ----------
                                                                                    $  107,575
                                                                                    ----------
                                                                                    ----------
</TABLE>
    
 
   
    Management expects that the cost of future investments will be capitalized
in future periods and depreciated over periods to be benefited.
    
 
   
    In accordance with the Contract described in Note 1, damages caused to the
environment on or prior to October 23, 1997, as well as any future claims
originated by those damages are responsibility of CENTROMIN. These obligations
of CENTROMIN have been guaranteed by the Republic of Peru through a Supreme
Decree.
    
 
   
POTENTIAL TAX ASSESSMENTS
    
 
   
    All existing and pending tax contingencies at the time of the acquisition of
Metaloroya were retained by CENTROMIN.
    
 
   
    Income tax and value added tax from October 23, 1997 to the date of this
report are pending examination by the tax authorities. If tax assessments were
made, any taxes or surcharges that must be paid would be charged to expenses in
the years in which they are assessed. In the opinion of the Company's
management, there are no matters that should result in significant tax
contingencies.
    
 
   
LITIGATIONS
    
 
   
    All existing and pending litigations at the time of the acquisition of
Metaloroya were retained by CENTROMIN.
    
 
   
ZINC FERRITE DISPOSAL
    
 
   
    According to the Contract described in Note 1, the Company has the option to
continue to use the existing zinc ferrite disposal site for three years, after
which it can either take ownership of the site or develop a new site. If the
Company decides to take ownership of the site, it will be responsible for its
ultimate closure costs, which have been estimated at US$7.2 million and recorded
as a reserve in the
    
 
                                      F-46
<PAGE>
   
           NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
    
 
   
                             AS OF OCTOBER 31, 1997
    
 
   
12. COMMITMENTS AND CONTINGENCIES (CONTINUED)
    
   
caption long-term liabilities in the accompanying consolidated balance sheet. If
the Company decides to develop a new site, it is required to pay to CENTROMIN
the US$7.2 million estimated closure costs.
    
 
   
13. RELATED PARTY TRANSACTION
    
 
   
    On October 23, 1997, Metaloroya granted to its shareholder, Doe Run Mining
S.R.Ltda., a US$125 million loan which does not accrue interest and matures on
October 23, 2002.
    
 
   
    In addition, Doe Run Peru has a payable to Doe Run Resources Corporation of
US$1.2 million related to payments made on behalf of the Company for the
acquisition of Metaloroya. This payable does not accrue interest.
    
 
   
14. SUBSEQUENT EVENT
    
 
   
    In the Extraordinary Shareholders' Meetings of Doe Run Peru and Metaloroya
held on November 3, 1997, the merger of Metaloroya into Doe Run Peru was
approved, being the surviving company Doe Run Peru. The merger will become
effective on December 30, 1997.
    
 
                                      F-47
<PAGE>
                             DOE RUN PERU S.R. LTDA
 
                           CONSOLIDATED BALANCE SHEET
 
                              AS OF APRIL 30, 1998
 
                         (IN THOUSANDS OF U.S. DOLLARS)
                                  (UNAUDITED)
   
<TABLE>
<CAPTION>
                                           ASSETS
<S>                                                                                 <C>
CURRENT ASSETS:
  Cash............................................................................  $   9,102
  Accounts receivable.............................................................     23,767
  Inventory.......................................................................     64,308
  Prepaid expenses and other current assets.......................................     21,977
  Due from parent.................................................................    134,054
                                                                                    ---------
      Total current assets........................................................    253,208
PROPERTY, PLANT AND EQUIPMENT, net................................................     95,921
                                                                                    ---------
      Total assets................................................................  $ 349,129
                                                                                    ---------
                                                                                    ---------
 
<CAPTION>
                            LIABILITIES AND SHAREHOLDERS' EQUITY
<S>                                                                                 <C>
CURRENT LIABILITIES:
  Short-term borrowing............................................................  $   5,000
  Trade accounts payable..........................................................     38,673
  Accrued liabilities.............................................................     16,743
  Net deferred tax liabilities....................................................      1,634
  Due to parent...................................................................     12,279
                                                                                    ---------
      Total current liabilities...................................................     74,329
 
RECLAMATION AND ENVIRONMENTAL COSTS...............................................      7,200
 
OTHER NON-CURRENT LIABILITIES.....................................................      1,249
                                                                                    ---------
      Total liabilities...........................................................     82,778
                                                                                    ---------
 
SHAREHOLDERS' EQUITY..............................................................
  Capital stock...................................................................    247,926
  Retained earnings...............................................................     18,425
                                                                                    ---------
      Total shareholders' equity..................................................    266,351
                                                                                    ---------
      Total liabilities and shareholders' equity..................................  $ 349,129
                                                                                    ---------
                                                                                    ---------
</TABLE>
    
 
                                      F-48
<PAGE>
   
                            DOE RUN PERU S.R. LTDA.
    
 
                        CONSOLIDATED STATEMENT OF INCOME
 
                         (IN THOUSANDS OF U.S. DOLLARS)
 
                                  (UNAUDITED)
 
   
<TABLE>
<CAPTION>
                                                                                                      DOE RUN
                                                                                                     PERU S.R.
                                                                                        LA OROYA       LTDA.
                                                                                       --------------------------
                                                                                            SIX MONTHS ENDED
                                                                                               APRIL 30,
                                                                                       --------------------------
                                                                                          1997          1998
                                                                                       ----------  --------------
<S>                                                                                    <C>         <C>
NET SALES                                                                              $  217,731    $  227,359
 
OPERATING COSTS AND EXPENSES:
  Costs of sales.....................................................................     181,566       181,631
  Depreciation.......................................................................       2,753         3,396
  Selling, general and administrative expenses.......................................      10,112        18,130
                                                                                       ----------  --------------
                                                                                          194,431       203,157
                                                                                       ----------  --------------
    Income from operations...........................................................      23,300        24,202
 
OTHER INCOME (EXPENSE):
  Interest expense...................................................................        (770)          (35)
  Interest income....................................................................      --               456
  Other, net.........................................................................      (1,438)          579
                                                                                       ----------  --------------
                                                                                           (2,208)        1,000
                                                                                       ----------  --------------
    Income before income tax.........................................................      21,092        25,202
 
INCOME TAX EXPENSE                                                                          6,382         6,668
                                                                                       ----------  --------------
    Net income.......................................................................  $   14,710    $   18,534
                                                                                       ----------  --------------
                                                                                       ----------  --------------
</TABLE>
    
 
                                      F-49
<PAGE>
                            DOE RUN PERU S.R. LTDA.
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                         (IN THOUSANDS OF U.S. DOLLARS)
                                  (UNAUDITED)
   
<TABLE>
<CAPTION>
                                                                                                       DOE RUN
                                                                                                      PERU S.R.
                                                                                         LA OROYA       LTDA.
<S>                                                                                     <C>         <C>
                                                                                        --------------------------
 
<CAPTION>
                                                                                             SIX MONTHS ENDED
                                                                                                APRIL 30,
                                                                                        --------------------------
                                                                                           1997          1998
                                                                                        ----------  --------------
<S>                                                                                     <C>         <C>
OPERATING ACTIVITIES:
  Net cash provided by operating activities...........................................  $   14,148    $      625
 
INVESTING ACTIVITIES:
  Additions of property, plant and equipment..........................................      --            (1,536)
                                                                                        ----------       -------
  Net cash used in investing activities...............................................      --            (1,536)
 
FINANCING ACTIVITIES:
  Proceeds from short-term borrowing..................................................      --             5,000
  Repayment of bank loans, net........................................................     (10,572)       --
  Transfer to Centromin...............................................................      (4,098)       --
                                                                                        ----------       -------
  Net cash provided by (used in) financing activities.................................     (14,670)        5,000
                                                                                        ----------       -------
 
NET INCREASE (DECREASE) IN CASH.......................................................        (522)        4,089
 
CASH AT BEGINNING OF PERIOD...........................................................         572         5,013
                                                                                        ----------       -------
 
CASH AT END OF PERIOD.................................................................  $       50    $    9,102
                                                                                        ----------       -------
                                                                                        ----------       -------
</TABLE>
    
 
                                      F-50
<PAGE>
                            DOE RUN PERU S.R. LTDA.
 
                 NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
 
   
                              AS OF APRIL 30, 1998
    
 
   
1. BASIS OF PRESENTATION
    
 
   
COMPARABILITY OF FINANCIAL STATEMENTS
    
 
   
    The consolidated statement of income and the consolidated statement of cash
flows for the six months ended April 30, 1997 reflect the basis of assets and
liabilities of La Oroya, a division of Centromin Peru S.A. The consolidated
statement of income and the consolidated statement of cash flows for the six
months ended April 30, 1998 reflect the new basis of assets and liabilities of
the Company acquired as of October 23, 1997. The Company's results may not be
comparable in all respects to those of La Oroya.
    
 
   
UNAUDITED INTERIM FINANCIAL STATEMENTS
    
 
   
    In the opinion of management, the interim consolidated financial statements
contain all adjustments consisting of normal recurring accruals, necessary to
present fairly the consolidated financial position and results of operations for
the periods presented herein. Interim periods are not necessarily indicative of
results to be expected for the year.
    
 
   
2. INVENTORY
    
 
   
    Inventory consists of the following as of April 30, 1998:
    
 
   
<TABLE>
<S>                                                                  <C>
Refined metals and concentrates for sale...........................  $   4,163
Metals and concentrates in process.................................     40,198
Materials, supplies and spare parts................................     19,948
                                                                     ---------
                                                                     $  64,308
                                                                     ---------
                                                                     ---------
</TABLE>
    
 
                                      F-51
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Board of Directors
 
Empresa Minera del Centro del Peru S.A.--Centromin Peru S.A.:
 
    We have audited the accompanying statements of assets and liabilities of La
Oroya Metallurgical Complex (La Oroya), a division of the Peruvian state-owned
corporation Empresa Minera del Centro del Peru S.A.--Centromin Peru S.A.
(Centromin), as of December 31, 1995 and 1996 and October 23, 1997 and the
related statements of revenues and expenses, changes in net assets and cash
flows for each of the years in the three-year period ended December 31, 1996 and
the period from January 1 to October 23, 1997. These financial statements are
the responsibility of Centromin's management. Our responsibility is to express
an opinion on these financial statements based on our audits.
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    As explained in Note 2, the above financial statements which have been
prepared from Centromin's accounting records, remeasured into U.S. dollars and
prepared following generally accepted accounting principles in the United States
of America, are intended to reflect separately the assets, liabilities, revenues
and expenses of La Oroya, as if La Oroya had operated as a separate entity and
applying certain allocations by Centromin on the basis described in Note 4 and
therefore, they may not necessarily reflect the financial position and results
of operations of La Oroya as if it were effectively a separate legal entity for
the periods indicated above.
 
    In our opinion, the financial statements referred to above, present fairly,
for the purpose described in the preceding paragraph, the assets and liabilities
of La Oroya as of December 31, 1995 and 1996 and October 23, 1997, and its
revenues and expenses and cash flows for each of the years in the three-year
period ended December 31, 1996 and the period from January 1 to October 23,
1997, in conformity with accounting principles generally accepted in the United
States of America.
 
                                          MEDINA, ZALDIVAR Y ASOCIADOS,
 
                                          a member firm of Andersen Worldwide SC
 
Countersigned by:
 
Marco Antonio Zaldivar
C.P.C. Register 12477
 
Lima, Peru
December 5, 1997
 
                                      F-52
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
                               LA OROYA DIVISION
 
                      STATEMENTS OF ASSETS AND LIABILITIES
 
                         (IN THOUSANDS OF U.S. DOLLARS)
<TABLE>
<CAPTION>
                                                                                 AS OF DECEMBER 31,       AS OF
                                                                               ----------------------  OCTOBER 23,
                                                                                  1995        1996        1997
                                                                               ----------  ----------  -----------
<S>                                                                            <C>         <C>         <C>
 
<CAPTION>
                                                      ASSETS
<S>                                                                            <C>         <C>         <C>
CURRENT ASSETS:
  Cash and deposits in banks.................................................  $       62  $      582   $      79
  Trade accounts receivable..................................................      15,335      30,277      10,423
  Inventory:
    Refined metals and concentrates for sale.................................      12,333       8,930      14,115
    Metal and concentrates in process........................................      74,175      43,555      43,007
    Materials, supplies and spare parts......................................      28,488       8,303      11,226
                                                                               ----------  ----------  -----------
                                                                                  114,996      60,788      68,348
                                                                               ----------  ----------  -----------
  Prepaid expenses...........................................................       2,524       1,591       1,922
                                                                               ----------  ----------  -----------
      Total current assets...................................................     132,917      93,238      80,772
                                                                               ----------  ----------  -----------
DEFERRED TAX AND WORKERS' PROFIT SHARING.....................................      --           4,262       2,853
PROPERTY, PLANT AND EQUIPMENT, net...........................................      55,557      50,814      46,145
                                                                               ----------  ----------  -----------
Total assets.................................................................  $  188,474  $  148,314   $ 129,770
                                                                               ----------  ----------  -----------
                                                                               ----------  ----------  -----------
<CAPTION>
                                            LIABILITIES AND NET ASSETS
<S>                                                                            <C>         <C>         <C>
CURRENT LIABILITIES:
  Bank loans.................................................................  $   19,626  $   15,068      --
  Accounts payable...........................................................      17,810       9,026   $  16,732
  Remuneration and taxes payable.............................................       5,275       4,709       4,535
  Advances from customers....................................................       7,925      10,750      --
  Accrued liabilities........................................................       3,266       4,477       2,369
  Severance indemnities......................................................      21,228       2,186       1,185
  Deposits of personnel's severance indemnities..............................       3,579       1,973      --
  Current portion of environmental liabilities...............................      --             730       2,530
                                                                               ----------  ----------  -----------
      Total current liabilities..............................................      78,709      48,919      27,351
                                                                               ----------  ----------  -----------
DEFERRED TAX AND WORKERS' PROFIT SHARING.....................................       2,098      --          --
ENVIRONMENTAL LIABILITIES, net of current portion............................      --          20,820      19,020
                                                                               ----------  ----------  -----------
      Total liabilities......................................................      80,807      69,739      46,371
                                                                               ----------  ----------  -----------
NET ASSETS...................................................................     107,667      78,575      83,399
                                                                               ----------  ----------  -----------
Total liabilities and net assets.............................................  $  188,474  $  148,314   $ 129,770
                                                                               ----------  ----------  -----------
                                                                               ----------  ----------  -----------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-53
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
                               LA OROYA DIVISION
 
                      STATEMENTS OF REVENUES AND EXPENSES
 
                         (IN THOUSANDS OF U.S. DOLLARS)
 
<TABLE>
<CAPTION>
                                                                                                       FOR THE
                                                                                                        PERIOD
                                                                  FOR THE YEARS ENDED DECEMBER 31,   JANUARY 1 TO
                                                                 ----------------------------------  OCTOBER 23,
                                                                    1994        1995        1996         1997
                                                                 ----------  ----------  ----------  ------------
<S>                                                              <C>         <C>         <C>         <C>
NET SALES......................................................  $  367,057  $  450,929  $  456,797   $  352,805
OPERATING COSTS AND EXPENSES:
  Costs of sales...............................................     339,302     397,524     397,158      305,959
  Depreciation and amortization................................       4,448       4,729       5,353        4,730
  Administrative and general...................................       4,569       4,479       5,660        5,223
  Selling and marketing........................................       5,715       5,972       6,669        4,808
  Workers' profit sharing......................................         813       2,995       1,197        2,284
  Personnel reduction costs....................................      --           2,504       3,894        1,490
                                                                 ----------  ----------  ----------  ------------
                                                                    354,847     418,203     419,931      324,494
                                                                 ----------  ----------  ----------  ------------
      Operating income.........................................      12,210      32,726      36,866       28,311
                                                                 ----------  ----------  ----------  ------------
OTHER INCOME (EXPENSES):
  Interest and bank charges....................................      (6,784)     (2,100)     (3,332)        (832)
  Exchange gains, net..........................................       3,840       2,050       1,884          269
  Other, net (see Note 15).....................................      (4,242)     (3,848)    (25,401)      (1,486)
                                                                 ----------  ----------  ----------  ------------
                                                                     (7,186)     (3,898)    (26,849)      (2,049)
                                                                 ----------  ----------  ----------  ------------
      Income before provision for income tax...................       5,024      28,828      10,017       26,262
PROVISION FOR INCOME TAX.......................................       2,803      10,332       4,128        7,879
                                                                 ----------  ----------  ----------  ------------
      Net income...............................................  $    2,221  $   18,496  $    5,889   $   18,383
                                                                 ----------  ----------  ----------  ------------
                                                                 ----------  ----------  ----------  ------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-54
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
                               LA OROYA DIVISION
 
                      STATEMENTS OF CHANGES IN NET ASSETS
 
                         (IN THOUSANDS OF U.S. DOLLARS)
 
<TABLE>
<CAPTION>
                                                                                                        NET ASSETS
                                                                                                        ----------
<S>                                                                                                     <C>
BALANCE AS OF JANUARY 1, 1994.........................................................................  $  123,901
  Net income..........................................................................................       2,221
  Transfers to Centromin..............................................................................     (61,632)
                                                                                                        ----------
BALANCE AS OF DECEMBER 31, 1994.......................................................................      64,490
  Net income..........................................................................................      18,496
  Transfers from Centromin............................................................................      24,681
                                                                                                        ----------
BALANCE AS OF DECEMBER 31, 1995.......................................................................     107,667
  Net income..........................................................................................       5,889
  Transfers to Centromin..............................................................................     (34,981)
                                                                                                        ----------
BALANCE AS OF DECEMBER 31, 1996.......................................................................      78,575
  Net income..........................................................................................      18,383
  Transfers to Centromin..............................................................................     (13,559)
                                                                                                        ----------
BALANCE AS OF OCTOBER 23, 1997........................................................................  $   83,399
                                                                                                        ----------
                                                                                                        ----------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-55
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                            STATEMENTS OF CASH FLOWS
 
                         (IN THOUSANDS OF U.S. DOLLARS)
 
<TABLE>
<CAPTION>
                                                                                                     FOR THE
                                                                                                      PERIOD
                                                                FOR THE YEARS ENDED DECEMBER 31,   JANUARY 1 TO
                                                               ----------------------------------  OCTOBER 23,
                                                                  1994        1995        1996         1997
                                                               ----------  ----------  ----------  ------------
<S>                                                            <C>         <C>         <C>         <C>
OPERATING ACTIVITIES:
  Net income.................................................  $    2,221  $   18,496  $    5,889   $   18,383
    Add (less):
      Depreciation and amortization..........................       4,448       4,729       5,353        4,730
      Deferred provision (benefit) of income tax and workers'
        profit sharing.......................................         692       1,406      (6,360)       1,409
      Increase in environmental liabilities..................      --          --          21,550       --
      Other..................................................         337      (1,281)       (610)         (61)
    Net changes in assets and liabilities:
      Decrease (increase) in trade accounts receivables......      11,325       1,679     (14,942)      19,854
      Decrease (increase) in inventory.......................      26,686     (35,035)     54,208       (7,560)
      Decrease (increase) in prepaid expenses................         423         926         933         (331)
      Increase (decrease) in accounts payable................      16,972      (8,786)     (8,784)       7,706
      Increase (decrease) in remuneration and taxes
        payable..............................................         386       1,210        (566)        (174)
      Advances from (payments to) customers, net.............       2,302      (3,749)      2,825      (10,750)
      Increase (decrease) in accrued liabilities.............           2       1,004       1,211       (2,108)
      Decrease in severance indemnities......................         (51)     (5,324)    (19,042)      (1,001)
      Increase (decrease) in deposits of personnel's
        severance indemnities................................         143       3,579      (1,606)      (1,973)
                                                               ----------  ----------  ----------  ------------
    Net cash provided by (used in) operating activities......      65,886     (21,146)     40,059       28,124
                                                               ----------  ----------  ----------  ------------
FINANCING ACTIVITIES:
  Repayments of bank loans, net..............................      (4,262)     (3,534)     (4,558)     (15,068)
  Transfers (to) from Centromin..............................     (61,632)     24,681     (34,981)     (13,559)
                                                               ----------  ----------  ----------  ------------
  Net cash provided by (used in) financing activities........     (65,894)     21,147     (39,539)     (28,627)
                                                               ----------  ----------  ----------  ------------
NET INCREASE (DECREASE) IN CASH AND DEPOSITS IN BANKS........          (8)          1         520         (503)
CASH AND DEPOSITS IN BANKS AT BEGINNING OF THE PERIOD........          69          61          62          582
                                                               ----------  ----------  ----------  ------------
CASH AND DEPOSITS IN BANKS AT THE END OF THE PERIOD..........  $       61  $       62  $      582   $       79
                                                               ----------  ----------  ----------  ------------
                                                               ----------  ----------  ----------  ------------
CASH FLOWS ADDITIONAL INFORMATION
  Interest paid..............................................  $    6,163  $    2,096  $    3,017   $    1,776
  Income tax paid (see Note 3)...............................  $   --      $   --      $   --       $   --
                                                               ----------  ----------  ----------  ------------
                                                               ----------  ----------  ----------  ------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-56
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                       NOTES TO THE FINANCIAL STATEMENTS
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(1) BUSINESS AND DISPOSITION
 
    The metallurgical complex of La Oroya (hereinafter "La Oroya") a division of
Empresa Minera del Centro del Peru S.A.--Centromin Peru S.A. (hereinafter
"Centromin") is engaged in the smelting and refining of polymetalic concentrates
and marketing and sale of refined metals. La Oroya primarily smelts and refines
the concentrates of polymetalic ores from the mining units of Centromin, which
include copper, lead and zinc. The operations of La Orya are conducted through
the Centromin organization systems, which include administrative, legal,
operating tasks, and all other necessary functions that support its operations.
 
    Centromin is engaged in mining activities as specified by the General Mining
Law (Supreme Decree 014-92-EM), as well as in industrial activities necessary to
sustain mining operations.
 
    On October 23, 1997, Centromin Peru S.A. contributed certain assets and
liabilities of La Oroya to a newly formed company, Metaloroya S.A.
("Metaloroya"), in exchange for shares in Metaloroya. Concurrent with the
transfer, Centromin sold all of the shares received to Doe Run Peru S.R. Ltda.
("Doe Run Peru"), a wholly owned subsidiary of Doe Run Mining S.R. Ltda., an
indirect wholly owned subsidiary of The Doe Run Resources Corporation.
 
(2) BASIS OF PRESENTATION
 
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities, the
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
    The financial statements of La Oroya division have been prepared in
accordance with the accounting principles generally accepted in the United
States of America ("U.S. GAAP"), which differ in certain significant respects
from generally accepted accounting principles in Peru. In addition, these
financial statements were prepared based on Centromin's accounting records
related to the metallurgical complex of La Oroya as if La Oroya had operated as
a separate entity and applying certain allocation methodologies, as specified in
Note 4.
 
    Unless otherwise indicated, all amounts in the financial statements and in
these notes are presented in thousands of U.S. dollars (US$).
 
(3) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    INVENTORY
 
    Inventory is stated at the lower of cost or net realized value. The cost of
refined metals and concentrates for sale, as well as metal and concentrates for
sale, as well as metal and concentrates in process is determined under the
first-in, first-out method ("FIFO"). The cost of materials, supplies and spare
parts is determined using the average cost method.
 
                                      F-57
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(3) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    PROPERTY, PLANT AND EQUIPMENT
 
    Property, plant and equipment are stated at cost. Depreciation is calculated
on a straight-line basis at the rates indicated in Note 8. Maintenance and minor
repairs are charged to expenses as incurred. Material improvements and renewals
are capitalized.
 
    In accordance with the Statement of Financial Accounting Standard No. 121,
"Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to
be Disposed of" ("SFAS 121"), La Oroya's management has determined that there is
no impairment of its long-lived assets.
 
    SEVERANCE INDEMNITIES
 
    Severance indemnities are determined according to governmental regulations
and are provided for on an accrual basis for the amount, which would be paid if
all personnel were to retire at the date of each statement of assets and
liabilities. Under Legislative Decree 650, an accrued liability was established
to recognize the liability for personnel severance indemnities earned by
employees prior to December 31, 1990. These severance indemnities, which are
adjusted for subsequent wage increases, are required to be funded over a maximum
term of ten years, beginning in June 1991. The funding of this obligation
eliminates any adjustment for subsequent wages increases. In 1996, La Oroya
fully funded this obligation. Liabilities relating to personnel severance
indemnities earned by employees after 1991 are accrued and semi-annually
deposited into workers' individual bank accounts.
 
    REVENUE RECOGNITION
 
    Sales are recorded when title passes to the customer, which occurs at the
time of shipment. With respect to concentrates, sales are recorded based on
estimated weights, assays and prices. All such concentrate sales are adjusted
when final weights, assays and prices are known. Adjustments to the provisional
billings are made in the period during which additional information becomes
available.
 
    INTEREST CAPITALIZATION
 
    Interest expense allocable to the construction of the oxygen plant of US
$4,297 was capitalized until the start-up of its operations in 1994. Capitalized
interest is expensed over the depreciable life of the asset to which it relates.
 
    INCOME TAX AND WORKERS' PROFIT SHARING
 
    La Oroya is included in Centromin's income tax return. According, La Oroya
has provided income tax and remitted to Centromin any tax payable, calculated as
if it were filing separate tax returns.
 
    Under Statement of Financial Accounting Standard No. 109, "Accounting for
Income taxes" ("SFAS 109"), which designates the liability method as the
required accounting method for taxes under U.S. GAAP, La Oroya recognizes the
tax effect of certain temporary differences between the financial reporting
basis of assets and liabilities and the related tax basis.
 
                                      F-58
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(3) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    Likewise, La Oroya recognizes the effect of temporary differences between
book and tax basis of assets and liabilities related to workers' profit sharing
on a basis similar to that used for income taxes.
 
(4) ALLOCATION METHODOLOGIES
 
    As described in Note 2, La Oroya's transactions are recorded in Centromin's
accounting systems. The operations of La Oroya conducted through Centromin have
been presented using assumptions and allocations which management believes are
reasonable. They include the following:
 
    (a) Centromin's assets and liabilities not specifically identifiable to La
       Oroya have not been allocated in the accompanying financial statements.
       These are cash and bank accounts, credit on value-added tax and
       liabilities to certain suppliers of administrative services.
 
    (b) Sales have been allocated based on the preliminary and final billings of
       the exported refined metals and concentrates identified with La Oroya.
 
    (c) Costs of production have been allocated based on the following:
 
       -  Concentrates acquired from Centromin's mining units were transferred
           at market value as if La Oroya were an independent party.
 
       -  The depreciation charge was based on the fixed assets specifically
           identifiable to La Oroya.
 
       -  Other allocated costs, included power, were based on the ratio of La
           Oroya's usage to total usage by Centromin (mainly time incurred and
           consumption of goods and services).
 
    (d) Expenses relating to corporate accounting, finance and administrative
       services provided by Centromin have been allocated based on the ratio of
       La Oroya's usage to total usage by Centromin.
 
    (e) Selling and marketing expenses have been allocated based on usage
       estimated by management.
 
    (f) Interest and bank charges are those which are directly related to La
       Oroya's bank loans and overdrafts obtained during the year.
 
    (g) Workers' profit sharing and income tax were provided based on the actual
       results as if La Oroya had been operating as a separate entity.
 
(5) REMEASUREMENT INTO U.S. DOLLAR
 
    La Oroya maintains its accounting records in Peruvian Nuevos Soles. Those
financial statements have been remeasured into U.S. dollars, which is its
functional currency, for all periods presented, in accordance with SFAS 52 using
the following methodology:
 
    (a) Non-monetary accounts have been remeasured at historical exchange rates.
 
                                      F-59
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(5) REMEASUREMENT INTO U.S. DOLLAR (CONTINUED)
    (b) Monetary accounts in Peruvian currency have been remeasured at the
       following free market exchange rates for buying (assets) and selling
       (liabilities) in effect at the end of the respective period, which are in
       Peruvian Nuevos soles per U.S. dollar:
 
<TABLE>
<CAPTION>
                                                                 AS OF DECEMBER 31,             AS OF
                                                           -------------------------------   OCTOBER 23,
                                                             1994       1995       1996         1997
                                                           ---------  ---------  ---------  -------------
<S>                                                        <C>        <C>        <C>        <C>
Assets...................................................       2.16      2.299      2.596        2.667
Liabilities..............................................       2.19      2.322      2.603        2.669
</TABLE>
 
    (c) Income and expenses, other than depreciation, that have been remeasured
       at the historical exchange rates that applied to the related assets, have
       been remeasured at average monthly basis at average exchange rates. Cost
       of sales was determined from its components once remeasured.
 
    The net effect of foreign exchange difference for each period is reflected
in the accompanying statement of revenues and expenses.
 
(6) FOREIGN CURRENCY TRANSACTIONS AND EXCHANGE RISK EXPOSURE
 
    Under current law, foreign currency transactions are made through the
financial banking system at free market exchange rates.
 
    The assets and liabilities denominated in Peruvian Nuevos Soles are as
follows (in thousands):
 
<TABLE>
<CAPTION>
                                                               AS OF DECEMBER 31,      AS OF
                                                              --------------------  OCTOBER 23,
                                                                1995       1996        1997
                                                              ---------  ---------  -----------
<S>                                                           <C>        <C>        <C>
Assets--
  Cash and deposits in banks................................     --            184         169
  Accounts receivable.......................................      4,055      1,602       3,698
                                                              ---------  ---------  -----------
                                                                  4,055      1,786       3,867
                                                              ---------  ---------  -----------
 
Liabilities--
  Trade accounts payable....................................      7,549      6,919           6
  Remuneration and taxes payable............................     12,249     12,257      15,298
  Accrued liabilities.......................................      5,721      9,504       2,200
                                                              ---------  ---------  -----------
                                                                 25,519     28,680      17,504
                                                              ---------  ---------  -----------
    Net position............................................    (21,464)   (26,894)    (13,637)
                                                              ---------  ---------  -----------
                                                              ---------  ---------  -----------
</TABLE>
 
    The net effects of exchange differences were US$3,840, US$2,050 and US$1,884
for the 1994, 1995 and 1996 years, respectively and US$269 for the period from
January 1 to October 23, 1997.
 
                                      F-60
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(7) MATERIALS, SUPPLIES AND SPARE PARTS
 
    This account is comprised of the following:
 
<TABLE>
<CAPTION>
                                                               AS OF DECEMBER 31,      AS OF
                                                              --------------------  OCTOBER 23,
                                                                1995       1996        1997
                                                              ---------  ---------  -----------
<S>                                                           <C>        <C>        <C>
Materials, supplies and spare parts.........................  $  25,714  $   8,335   $  11,748
Supplies in transit.........................................      2,935        490      --
                                                              ---------  ---------  -----------
                                                                 28,649      8,825      11,748
                                                              ---------  ---------  -----------
Less--allowance for obsolescence............................       (161)      (522)       (522)
                                                              $  28,488  $   8,303   $  11,226
                                                              ---------  ---------  -----------
                                                              ---------  ---------  -----------
</TABLE>
 
    In management's opinion, the balance of the allowance for obsolescence
adequately covers the related risk as of each statement of assets and
liabilities date.
 
(8) PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION
 
    This account is comprised of the following:
 
<TABLE>
<CAPTION>
                                                                               AS OF DECEMBER 31,        AS OF
                                                            ANNUAL RATE OF   -----------------------  OCTOBER 23,
DESCRIPTION                                                  DEPRECIATION       1995        1996         1997
- ---------------------------------------------------------  ----------------  ----------  -----------  -----------
<S>                                                        <C>               <C>         <C>          <C>
Land.....................................................         --         $       97  $        97  $        97
Buildings and other premises.............................         3% to 10%      21,335       21,335       21,335
Machinery and equipment..................................      6.67% to 30%     112,072      112,072      112,072
Furniture and fixtures...................................        10% to 15%       1,388        1,388        1,388
Other equipment..........................................        10% to 20%      13,153       13,153       13,153
Construction in progress.................................         --              3,005        3,005        3,005
                                                                             ----------  -----------  -----------
                                                                                151,050      151,050      151,050
Accumulated depreciation.................................                       (95,493)    (100,236)    (104,905)
                                                                             ----------  -----------  -----------
                                                                             $   55,557  $    50,814  $    46,145
                                                                             ----------  -----------  -----------
                                                                             ----------  -----------  -----------
</TABLE>
 
    Fully depreciated assets amounted to US$80,684, US$80,857, and US$80,907 as
of December 31, 1995, 1996 and October 23, 1997.
 
    There were no significant additions to property, plant and equipment during
the period presented above. The accounting records of Centromin do not identify
the minor additions to fixed assets (other than construction in progress) by
specific year and, therefore, it is not possible to determine fixed asset
additions specifically related to La Oroya in each year. Accordingly, in the
preparation of the accompanying financial statements, the fixed assets in
service at October 23, 1997 have been assumed to be in service as of each
balance sheet date and for each period presented.
 
                                      F-61
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(9) BANK LOANS
 
    Bank loans are short-term obligations, which were obtained from local and
foreign financial institutions for working capital purposes. As of December 31,
1995 and 1996 and as of October 23, 1997, 70 percent, 100 percent and 100
percent, respectively, of bank loans were denominated in U.S. dollars. The fair
value of these loans approximate their carrying value.
 
    The loans bear interest at international market rates. The weighted average
interest rate on bank loans at December 31, 1995 and 1996 and October 23, 1997
was 8.1 percent, 6.5 percent and 6.7 percent, respectively.
 
(10) REMUNERATIONS AND TAXES PAYABLE
 
    This account is comprised of the following:
 
<TABLE>
<CAPTION>
                                                                 AS OF DECEMBER 31,        AS OF
                                                              ------------------------  OCTOBER 23,
                                                                 1995         1996         1997
                                                              -----------  -----------  -----------
<S>                                                           <C>          <C>          <C>
Remunerations:
  Bonus.....................................................      --           --        $   1,023
  Vacations.................................................   $   1,691    $   1,465        1,248
  Vacation bonus............................................       1,747        1,229        1,109
  Payroll and other.........................................         552          544          102
                                                              -----------  -----------  -----------
                                                                   3,990        3,238        3,482
                                                              -----------  -----------  -----------
Taxes and contributions:
  Social security...........................................         694          669          275
  National housing fund.....................................         339          263          150
  Private pension system....................................      --              202          161
  Income tax withholdings...................................          92          211          240
  Others....................................................         160          126          227
                                                              -----------  -----------  -----------
                                                                   1,285        1,471        1,053
                                                              -----------  -----------  -----------
    Total...................................................   $   5,275    $   4,709    $   4,535
                                                              -----------  -----------  -----------
                                                              -----------  -----------  -----------
</TABLE>
 
(11) ADVANCES FROM CUSTOMERS
 
    Advances from customers located abroad are denominated in U.S. dollars.
Advances bore interest at the rate of 8.5% per annum and are offset against
receivables resulting from subsequent sales. The fair value of these advances
approximate their carrying value at each date.
 
                                      F-62
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(12) ACCRUED LIABILITIES
 
    This account is comprised of the following:
 
<TABLE>
<CAPTION>
                                                                 AS OF DECEMBER 31,        AS OF
                                                              ------------------------  OCTOBER 23,
                                                                 1995         1996         1997
                                                              -----------  -----------  -----------
<S>                                                           <C>          <C>          <C>
Contingencies (see Note 17).................................   $   1,808    $   1,808    $   1,706
Interest and bank charges payable...........................   $     525    $     855       --
Withholdings to contractors.................................         454          284          122
Personnel reduction accrual.................................      --              953       --
Other.......................................................         479          577          541
                                                              -----------  -----------  -----------
                                                               $   3,266    $   4,477    $   2,369
                                                              -----------  -----------  -----------
                                                              -----------  -----------  -----------
</TABLE>
 
(13) SEVERANCE INDEMNITIES
 
    According to current government regulations, the liability for personnel
severance indemnities earned by employees prior to December 31, 1990, as
adjusted for subsequent wage increases until such time as the liability is
funded, must be accrued and funded over a maximum term of 10 years, beginning in
June 1991. The funding of this obligation eliminates any retroactive adjustments
from subsequent wage increases. In 1996, La Oroya fully funded this obligation.
Obligations relating to personnel severance indemnities accrued subsequent to
1990 are paid semi-annually through deposits in workers' individual bank
accounts. The analysis of the account is as follows:
 
<TABLE>
<CAPTION>
                                                              AS OF DECEMBER 31,      AS OF
                                                             --------------------  OCTOBER 23,
                                                               1995       1996        1997
                                                             ---------  ---------  -----------
<S>                                                          <C>        <C>        <C>
Balance at the beginning of period.........................  $  22,540  $  21,228   $   2,186
  Provision................................................  $   6,040  $   5,926       2,154
  Payments and advances....................................     (5,750)   (23,365)     (2,960)
  Exchange difference......................................     (1,602)    (1,603)       (195)
                                                             ---------  ---------  -----------
Balance at the end of period...............................  $  21,228  $   2,186   $   1,185
</TABLE>
 
    In addition, as of December 31, 1995 and 1996, certain employees had elected
to deposit their indemnity payments amounting to US$3,579 and US$1973
respectively, with Centromin. In 1997, all such indemnity liabilities were
transferred to banks as directed by each employee.
 
(14) TAXATION AND WORKERS' PROFIT SHARING
 
    Centromin is subject to the Peruvian tax regulations, which require that
income tax be determined based on financial statements adjusted to reflect the
changes in the wholesale price level, following the methodology prescribed by
Legislative Decree 797. The statutory income tax rate in Peru is 30% of the
taxable income. In 1992, the Peruvian law established an alternative minimum tax
of 2 percent, which is calculated based on the total assets. Beginning in 1994,
exporting corporations may deduct from the
 
                                      F-63
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(14) TAXATION AND WORKERS' PROFIT SHARING (CONTINUED)
minimum income tax base the accounts receivable and inventories related to
export activities and the value of fixed assets acquired during the current
year, for two consecutive years. In May 1997, the minimum income tax was
abrogated and an extraordinary tax was imposed equal to 0.5% of the net assets
declared in the 1996 income tax return. This tax constitutes a credit against
the monthly income tax prepayments made from July through December 1997 and the
regularization payment for the 1997 year.
 
    La Oroya is included in Centromin's tax return. As such it has provided
income tax, and remitted any tax due to Centromin, based upon the statutory tax
rate in effect for each period, applied as if La Oroya filed a separate income
tax return.
 
    In May 1994, Centromin signed a Tax Stabilization Agreement with the
Peruvian government for a ten-year period beginning in 1997.
 
    The following conditions would be guaranteed to Centromin:
 
    -  Utilization of the tax rules prevailing on April 25, 1994.
 
    -  Custom duties will be calculated at rates ranging from 15% to 25%.
 
    -  Free commercialization of its products.
 
    -  No restriction in the use of proceeds from export sales.
 
    -  Free conversion of foreign currency generated by local sales.
 
    -  No discrimination in foreign currency transactions.
 
    In accordance with current workers' profit sharing government regulations,
La Oroya's workers have the right to receive 8 percent of La Oroya's taxable
income, of which 50 percent is distributed among all employees based on the
number of days worked by each employee and the remaining amount is distributed
in proportion to their salaries. Such profit sharing is limited to 18 times the
annual salary for each worker. Any excess is to be reserved and expended for
training of workers.
 
    The provision for income tax and workers' profit sharing is comprised of the
following for each of the years in the period ended December 31, 1996 and for
the period from January 1 to October 23, 1997:
 
<TABLE>
<CAPTION>
                                                     1994       1995       1996       1997
                                                  ----------  ---------  ---------  ---------
<S>                                               <C>         <C>        <C>        <C>
Current provision...............................  $    2,924  $  11,921  $  11,685  $   8,754
Deferred provision (benefit)....................         692      1,406     (6,360)     1,409
                                                  ----------  ---------  ---------  ---------
Total...........................................  $    3,616  $  13,327  $   5,325  $  10,163
                                                  ----------  ---------  ---------  ---------
                                                  ----------  ---------  ---------  ---------
Breakdown--
 
Income tax......................................  $    2,803  $  10,332  $   4,128  $   7,879
Workers' profit sharing.........................         813      2,995      1,197      2,284
                                                  ----------  ---------  ---------  ---------
                                                  $    3,616  $  13,327  $   5,325  $  10,163
                                                  ----------  ---------  ---------  ---------
                                                  ----------  ---------  ---------  ---------
</TABLE>
 
                                      F-64
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(14) TAXATION AND WORKERS' PROFIT SHARING (CONTINUED)
    The following are the components of deferred tax and workers' profit sharing
assets (liability) at December 31, 1995 and 1996 and October 23, 1997:
 
<TABLE>
<CAPTION>
                                                                  1995       1996       1997
                                                                ---------  ---------  ---------
<S>                                                             <C>        <C>        <C>
Environmental costs not deducted in tax return................  $  --      $   7,672  $   7,672
Tax depreciation in excess of book depreciation...............     (2,656)    (4,104)    (5,283)
Contingencies not deducted in tax return......................        644        644        644
Other.........................................................        (86)        50       (180)
                                                                ---------  ---------  ---------
                                                                $  (2,098) $   4,262  $   2,853
                                                                ---------  ---------  ---------
                                                                ---------  ---------  ---------
</TABLE>
 
    The reconciliation of the income tax provision computed at the statutory
Peruvian income tax rate to the provision for income tax recorded on a U.S. GAAP
basis in the statements of revenues and expenses is as follows:
 
<TABLE>
<CAPTION>
                                                       1994       1995       1996       1997
                                                     ---------  ---------  ---------  ---------
<S>                                                  <C>        <C>        <C>        <C>
Income before income tax...........................  $   5,024  $  28,828  $  10,017  $  26,262
Statutory tax rate.................................         30%        30%        30%        30%
                                                     ---------  ---------  ---------  ---------
Income tax provision at statutory tax rate.........      1,507      8,648      3,005      7,879
Effects of items increasing (decreasing) the
  effective tax rate:
  Permanent items
    Write off of unrecoverable taxes...............     --            883     --         --
    Tax penalties and assessments..................      1,266     --            335     --
  Adjustment of inventory affecting years prior to
    1994...........................................     --          1,270     --         --
  Adjustment of inventory affecting 1995 and
    1996...........................................     --           (616)       616     --
  Other............................................         30        147        172     --
                                                     ---------  ---------  ---------  ---------
Actual provision for income tax....................  $   2,803  $  10,332  $   4,128  $   7,879
                                                     ---------  ---------  ---------  ---------
                                                     ---------  ---------  ---------  ---------
</TABLE>
 
                                      F-65
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(15) OTHER INCOME AND (EXPENSES)
 
    This caption includes the following:
 
<TABLE>
<CAPTION>
                                                                                                         FOR THE
                                                                                                          PERIOD
                                                                     FOR THE YEARS ENDED DECEMBER 31,  JANUARY 1 TO
                                                                     --------------------------------  OCTOBER 23,
                                                                       1994       1995        1996         1997
                                                                     ---------  ---------  ----------  ------------
<S>                                                                  <C>        <C>        <C>         <C>
Income:
  Storage and other services.......................................  $     136  $     470  $    1,038   $    1,226
  Other............................................................        417        434          --          706
                                                                     ---------  ---------  ----------  ------------
                                                                           553        904       1,038        1,932
                                                                     ---------  ---------  ----------  ------------
Expenses:
  Privatization costs..............................................     --         --          (3,570)      (3,200)
Environmental program..............................................     --         --         (21,550)      --
  Write off of unrecoverable taxes.................................     --         (2,944)     --           --
  Contingencies....................................................     --         (1,808)     --           --
  Tax penalties and assessments....................................     (4,219)    --          (1,116)      --
  Other............................................................       (576)    --            (203)        (218)
                                                                     ---------  ---------  ----------  ------------
                                                                        (4,795)    (4,752)    (26,439)      (3,418)
                                                                     ---------  ---------  ----------  ------------
        Other, net.................................................  $  (4,242) $  (3,848) $  (25,401)  $   (1,486)
                                                                     ---------  ---------  ----------  ------------
                                                                     ---------  ---------  ----------  ------------
</TABLE>
 
    The privatization costs include costs related to moving La Oroya's personnel
away from the metallurgical complex of Centromin. These costs consist mainly of
demolition and construction of apartments, colleges and parks at the new
location.
 
(16) PERSONNEL REDUCTION COSTS
 
    La Oroya recognized a charge in 1995 of US$2,504 related to the first part
of its personnel reduction program. This amount was fully paid in 1995. In
January 1996, the Board of Directors approved a second personnel reduction
program which applied to an additional 600 workers. The estimated cost of
US$3,894 was recorded in expenses in 1996. An additional provision of US$1,490
was recorded in the period from January 1 to October 23, 1997, in connection
with the second personnel reduction program.
 
(17) COMMITMENTS AND CONTINGENCIES
 
    ENVIRONMENTAL MATTERS
 
    In 1995, in compliance with Supreme Decree 016-93-EM, amended by Supreme
Decree 059-93-EM, (Regulation for the Environmental Protection in the Mining and
Metallurgical Activities), Centromin filed a preliminary evaluation of its
mining units and of the smelter and refineries in La Oroya, which were approved
by the Ministry of Energy and Mining (the competent authority).
 
                                      F-66
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(17) COMMITMENTS AND CONTINGENCIES (CONTINUED)
    At the date of that report, in compliance with the provisions of such
decrees and according to the preliminary evaluation above mentioned, Centromin
prepared a Programa de Adecuacion y Manejo Ambiental (Environmental Adjustment
and Management Program) (the "PAMA") for La Oroya metallurgical complex. The
program comprises the development of engineering projects to remediate any
existing environmental problems and to comply with current environmental
regulations. This program, which was approved by the competent authority in
January 1997, establishes total future disbursements of US$21.5 million to
remediate the damages to the environment and to establish methods of compliance
with current environmental regulations. The Company recognized a charge to
operations in 1996 for the estimated cost of such remedial actions (see Note
15).
 
    The remediation program and the investment in environmental control
equipment required to comply with current regulations is to be implemented over
a ten year period beginning in 1997. Management expects that the cost of future
investments, principally for pollution control equipment, will be capitalized in
future periods and depreciated over the periods to be benefited.
 
    In accordance with a revised program approved by the Ministry of Energy and
Mining, the disbursements are estimated by management to be as follows:
 
<TABLE>
<CAPTION>
                                                                                            FUTURE
                                                                                          EXPENDITURE
                                                                             REMEDIATION  FOR CONTROL
                                                                                COSTS      EQUIPMENT     TOTAL
                                                                             -----------  -----------  ----------
<S>                                                                          <C>          <C>          <C>
1997.......................................................................   $     730       --       $      730
1998.......................................................................       1,800    $   2,700        4,500
1999.......................................................................       1,950        3,612        5,562
2000.......................................................................       4,000        4,963        8,963
2001.......................................................................       3,750        3,300        7,050
2002.......................................................................       2,050        3,800        5,850
2003.......................................................................       2,100        3,000        5,100
2004.......................................................................       2,100        2,775        4,875
2005.......................................................................       3,070       38,700       41,770
2006.......................................................................      --           44,725       44,725
                                                                             -----------  -----------  ----------
    Total..................................................................   $  21,550    $ 107,575   $  129,125
                                                                             -----------  -----------  ----------
                                                                             -----------  -----------  ----------
</TABLE>
 
    In addition, PAMA estimated the cost to eventually close the metallurgical
complex of La Oroya at US$24 million. No provision has been recorded for this
amount, since there are no plans to close the complex.
 
    The timing and amounts listed in the above table are estimates and actual
amounts and timing of payments could vary from the estimates. Furthermore, in
accordance with the Article 9 of the rules of the General Law on Mining, annual
expenditures for environmental remediation and control cannot be less than 1
percent of total sales.
 
                                      F-67
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(17) COMMITMENTS AND CONTINGENCIES (CONTINUED)
    POTENTIAL TAX ASSESSMENTS
 
    Centromin's income tax returns of 1993 through 1996, as well as the net
worth tax returns of 1992 and 1993, are pending review by the National
Superintendency of Tax Administration. No significant liabilities arose as a
result of the 1992 income tax return review. If tax assessments were made, any
tax, interest or surcharges would be charged to expense in the years in which
the assessment is known. In the opinion of Centromin's management there are no
matters that should result in significant additional tax assessments.
 
    INVESTMENT PROGRAM
 
    As discussed in Note 14, in May 1994 Centromin signed a Tax Stabilization
Agreement with the Peruvian Government for a ten-year period beginning the year
in which Centromin meets the Investment Program for La Oroya metallurgical
complex, which was then estimated at US$11.1 million. The investment program was
completed in December, 1996. In March 1997, the Mining Bureau approved the
completion of the Investment Program. Actual expenditures amounted to
approximately US$11.5 million.
 
    CONTINGENCIES
 
    At October 23, 1997, La Oroya metallurgical complex has legal suits
aggregating US$15.7 million related to labor matters. The financial statements
include a reserve of US$1.7 million (see note 12) estimated to cover the cost of
defending and settling such matters. In management and legal advisors' opinion,
the ultimate outcome of these suits will not result in a material adverse effect
on La Oroya's financial position and results of operations.
 
    In addition, there is a contingency amounting to approximately US$12
million, related to demands filed by 19 local mining companies, which are
claiming the refund of value-added-tax withheld by La Oroya from 1975 to 1980.
In opinion of La Oroya's management and its legal advisors, the ultimate outcome
of these demands will be favorable to La Oroya.
 
    SALES COMMITMENTS AND CONCENTRATION
 
    La Oroya derives its revenue from the sale of its refined metals and
concentrates to several customers. La Oroya's three largest customers accounted
for: 11%, 6% and 6%, respectively, of net sales in the period from January 1 to
October 23, 1997. The percentages in 1994 were 13%, 11% and 10%; in 1995 were
15%, 14% and 12% and in 1996 were 11%, 7% and 6%. These customers have sales
contracts, which guarantee their supply at prices derived from international
market quotations.
 
(18) RELATED PARTY TRANSACTIONS
 
    Expenses allocated from Centromin to the operations of La Oroya related
primarily to accounting and administrative support services. These expenses
amounted to US$5,223 in the period from January 1 to October 23, 1997, US$5,660
in 1996, US$4,479 in 1995 and US$4,569 in 1994.
 
                                      F-68
<PAGE>
          EMPRESA MINERA DEL CENTRO DEL PERU S.A.--CENTROMIN PERU S.A.
 
                               LA OROYA DIVISION
 
                 NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)
 
                           AS OF OCTOBER 23, 1997 AND
                        DECEMBER 31, 1996, 1995 AND 1994
 
(18) RELATED PARTY TRANSACTIONS (CONTINUED)
    Purchases of concentrates of polymetalic ores from the mining units of
Centromin were:
 
<TABLE>
<CAPTION>
                                                                                   PERCENTAGE OF
                                                                     VALUE OF     THE TOTAL VALUE
PERIOD                                                              PURCHASES       OF PURCHASE
- ------------------------------------------------------------------  ----------  -------------------
<S>                                                                 <C>         <C>
1994..............................................................  $  146,673              60%
1995..............................................................     182,218              58
1996..............................................................     178,018              67
For the period from January 1 to October 31, 1997.................     135,644              59
</TABLE>
 
(19) GEOGRAPHIC DATA
 
    The following is an analysis of net sales by geographic region:
 
<TABLE>
<CAPTION>
                                                                                                       FOR THE
                                                                                                        PERIOD
                                                                  FOR THE YEARS ENDED DECEMBER 31,   JANUARY 1 TO
                                                                 ----------------------------------  OCTOBER 23,
                                                                    1994        1995        1996         1997
                                                                 ----------  ----------  ----------  ------------
<S>                                                              <C>         <C>         <C>         <C>
USA............................................................  $  131,644  $  105,837  $  184,546   $   94,050
Latin America..................................................     177,627     201,631     162,620      165,866
Asia...........................................................      28,672     112,401      84,964       65,975
Europe.........................................................      29,114      31,060      24,667       26,914
                                                                 ----------  ----------  ----------  ------------
                                                                 $  367,057  $  450,929  $  456,797   $  352,805
                                                                 ----------  ----------  ----------  ------------
                                                                 ----------  ----------  ----------  ------------
</TABLE>
 
(20) SUBSEQUENT EVENT
 
    In the Extraordinary Shareholders' Meetings of Doe Run Peru and Metaloroya
held on November 3, 1997, the merger of Metaloroya into Doe Run Peru was
approved, the surviving company being Doe Run Peru. The merger will be on
December 30, 1997.
 
                                      F-69
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors of
ASARCO Incorporated
 
    In our opinion, the accompanying balance sheets and the related statements
of income and statements of divisional equity and of cash flows present fairly,
in all material respects, the financial position of the Missouri Lead Division
at December 31, 1997 and 1996, and the results of their operations and their
cash flows for each of the three years in the period ended December 31, 1997, in
conformity with generally accepted accounting principles. These financial
statements are the responsibility of the Company's management; our
responsibility is to express an opinion on these financial statements based on
our audits. We conducted our audits of these statements in accordance with
generally accepted auditing standards which require that we plan and perform the
audit to obtain reasonable assurance about whether the financial statements are
free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements,
assessing the accounting principles used and significant estimates made by
management, and evaluating the overall financial statement presentation. We
believe that our audits provide a reasonable basis for the opinion expressed
above.
 
                                          PricewaterhouseCoopers LLP
 
New York, New York
July 28, 1998
 
                                      F-70
<PAGE>
                             MISSOURI LEAD DIVISION
 
                            STATEMENTS OF OPERATIONS
 
                        FOR THE YEARS ENDED DECEMBER 31,
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                    1997        1996       1995
                                                                                  ---------  ----------  ---------
<S>                                                                               <C>        <C>         <C>
Revenues........................................................................  $  85,308  $  104,247  $  97,455
Cost of sales...................................................................     68,429      69,501     60,546
General and administrative......................................................      4,605       4,160      4,235
Depreciation and depletion......................................................      8,209       6,543      7,723
Research........................................................................        349         327        370
                                                                                  ---------  ----------  ---------
Operating expenses..............................................................     81,592      80,531     72,874
                                                                                  ---------  ----------  ---------
Earnings before income taxes....................................................      3,716      23,716     24,581
Income tax expense (benefit)....................................................       (168)      5,018      5,758
                                                                                  ---------  ----------  ---------
Net earnings....................................................................  $   3,884  $   18,698  $  18,823
                                                                                  ---------  ----------  ---------
                                                                                  ---------  ----------  ---------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-71
<PAGE>
                             MISSOURI LEAD DIVISION
 
                                 BALANCE SHEETS
 
                               AS OF DECEMBER 31,
 
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                1997       1996
                                                                                              ---------  ---------
<S>                                                                                           <C>        <C>
Cash........................................................................................  $     232  $      92
Receivables, net of allowance for doubtful accounts of $150 for 1997 and 1996...............      9,414     16,967
Metal inventories...........................................................................      5,635      8,010
Supply inventories..........................................................................      5,564      6,266
Other current assets........................................................................         86        188
                                                                                              ---------  ---------
  Current assets............................................................................     20,931     31,523
 
Mineral land................................................................................     30,542     30,209
Buildings...................................................................................     37,069     34,937
Machinery and equipment.....................................................................     86,689     83,384
                                                                                              ---------  ---------
  Total cost................................................................................    154,300    148,530
Accumulated depreciation and depletion......................................................    (89,380)   (81,553)
                                                                                              ---------  ---------
  Property, net.............................................................................     64,920     66,977
                                                                                              ---------  ---------
  Total assets..............................................................................  $  85,851  $  98,500
                                                                                              ---------  ---------
                                                                                              ---------  ---------
 
Accounts payable and accrued expenses.......................................................  $   5,976  $   7,337
Salaries and wages accrued..................................................................      1,096        916
Reserve for workers compensation............................................................      1,432      1,506
Other current liabilities...................................................................        704        821
                                                                                              ---------  ---------
  Current liabilities.......................................................................      9,208     10,580
Reclamation reserves........................................................................        534     --
Other non-current liabilities...............................................................          7     --
Deferred tax liability......................................................................      8,227      9,241
                                                                                              ---------  ---------
  Total liabilities.........................................................................     17,976     19,821
 
Commitments and contingencies
Divisional equity...........................................................................     67,875     78,679
                                                                                              ---------  ---------
  Total liabilities and equity..............................................................  $  85,851  $  98,500
                                                                                              ---------  ---------
                                                                                              ---------  ---------
</TABLE>
 
   The accompanying notes are an integral part to these financial statements.
 
                                      F-72
<PAGE>
                             MISSOURI LEAD DIVISION
 
                            STATEMENTS OF CASH FLOWS
 
                        FOR THE YEARS ENDED DECEMBER 31,
 
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                    1997       1996        1995
                                                                                 ----------  ---------  ----------
<S>                                                                              <C>         <C>        <C>
OPERATING ACTIVITIES
Net Earnings...................................................................  $    3,884  $  18,698  $   18,823
Adjustments to reconcile net earnings to to net cash provided from operating
  activities:
  Deferred income taxes........................................................      (1,014)     1,336       1,595
  Depreciation and depletion...................................................       8,209      6,543       7,723
  Cash provided from operating assets and liabilities:
    Accounts receivable........................................................       7,553     (7,214)      4,699
    Accounts payable and accrued expenses......................................      (1,298)    (3,285)      6,134
    Inventories................................................................       3,077      1,072      (3,189)
    Other assets and liabilities...............................................         570         35         240
                                                                                 ----------  ---------  ----------
Net cash provided from operating activities....................................      20,981     17,185      36,025
 
INVESTING ACTIVITIES
Capital expenditures...........................................................      (6,153)   (15,858)     (7,431)
                                                                                 ----------  ---------  ----------
Net cash used for investing activities.........................................      (6,153)   (15,858)     (7,431)
 
FINANCING ACTIVITIES
Net distributions to Asarco....................................................     (14,688)    (1,252)    (28,615)
                                                                                 ----------  ---------  ----------
Net cash used for financing activities.........................................     (14,688)    (1,252)    (28,615)
Increase (decrease) in cash....................................................         140         75         (21)
Cash at beginning of year......................................................          92         17          38
                                                                                 ----------  ---------  ----------
Cash at end of year............................................................  $      232  $      92  $       17
                                                                                 ----------  ---------  ----------
                                                                                 ----------  ---------  ----------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-73
<PAGE>
                             MISSOURI LEAD DIVISION
 
                   STATEMENTS OF CHANGES IN DIVISIONAL EQUITY
 
                        FOR THE YEARS ENDED DECEMBER 31,
 
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                    1997       1996        1995
                                                                                 ----------  ---------  ----------
<S>                                                                              <C>         <C>        <C>
Balance at beginning of year...................................................  $   78,679  $  61,233  $   71,025
Net earnings...................................................................       3,884     18,698      18,823
Net distribution to Asarco.....................................................     (14,688)    (1,252)    (28,615)
                                                                                 ----------  ---------  ----------
Balance at end of year.........................................................  $   67,875  $  78,679  $   61,233
                                                                                 ----------  ---------  ----------
                                                                                 ----------  ---------  ----------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-74
<PAGE>
                             MISSOURI LEAD DIVISION
 
                         NOTES TO FINANCIAL STATEMENTS
 
                             (DOLLARS IN THOUSANDS)
 
(1) BASIS OF PRESENTATION
 
    The Missouri Lead Division ("the Company") is an unincorporated division of
Asarco Incorporated ("Asarco"). The financial statements reflect the financial
position, results of operations, changes in divisional equity and cash flows of
the Company as if it were a separate entity for all periods presented. The
financial statements include allocations of certain Asarco corporate
headquarters expenses (including cash management, legal, accounting, tax,
employee benefits, insurance services, data services and other Asarco corporate
overhead). Management believes these allocations are reasonable. However, the
costs of these services and benefits charged to the Company are not necessarily
indicative of the costs that would have been incurred if the Company had
performed or provided these functions as a separate entity.
 
    The financial information included herein may not necessarily reflect the
results of operations, financial position, changes in divisional equity and cash
flows of the Company in the future or what they would have been had it been a
separate stand-alone entity during the periods presented.
 
(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    Use of Estimates: The preparation of financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets, liabilities,
revenues and expenses and the disclosure of contingent assets and liabilities.
Actual results could differ from those estimates. Estimates are used in the
determination of allowances for doubtful accounts, depreciation and depletion,
expense accruals, taxes and contingencies, among others.
 
    Cash and cash equivalents: Cash equivalents include highly liquid
investments with a maturity of less than three months at the time of investment.
 
    Inventories: Metal inventories are valued at the lower of first-in,
first-out (FIFO) cost or market. Supply inventories are valued at the lower of
average cost or net realizable value.
 
    Long-lived assets: Long-lived assets are valued at cost. In accordance with
Statement of Financial Accounting Standards ("SFAS") No. 121, "Accounting for
the Impairment of Long-Lived Assets and for Long-Lived Assets To Be Disposed
Of," the Company reviews long-lived assets for impairment whenever events or
changes in circumstances indicate that the carrying amount of the assets may not
be recoverable.
 
    The Company evaluates the carrying value of assets based on undiscounted
future cash flows and also considers expected metal prices based on historical
metal prices and price trends.
 
    Depreciation, amortization and betterments: Plant assets are depreciated
over their estimated useful lives, generally by the units-of-production method.
Depreciation and depletion of mine assets are computed generally by the
units-of- production method using proven and probable ore reserves. Other non-
plant assets are depreciated using the straight-line method. Renewals and the
cost of major development programs at existing mines are capitalized as mineral
land. Maintenance, repairs, normal development costs at existing mines, and
gains or losses on assets retired or sold are reflected in earnings as incurred.
 
    Revenue Recognition: Revenue is recognized in the month product is shipped
to customers. Substantially all of the Company's lead production is sold to
customers pursuant to annual contracts which provide for pricing at the average
price for lead, on the London Metal Exchange (LME), during the month of shipment
plus a fixed premium. The Company's zinc production is sold in the form of
concentrates under contracts of one to three years which provide for pricing at
the average price for zinc, on the LME, during the month of shipment.
 
                                      F-75
<PAGE>
                             MISSOURI LEAD DIVISION
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    Financial Instruments: The Company may use derivative instruments to manage
its exposure to market risk from changes in commodity prices or the value of its
assets and liabilities. Derivative instruments which are designated as hedges
must be deemed effective at reducing the risk associated with the exposure being
hedged and must be designated as a hedge at the inception of the contract. Gains
and losses on such instruments are reported as a component of the underlying
transaction. Pre-tax earnings include a gain of $216 in 1996, and a loss of $250
in 1995, related to lead hedging contracts. At December 31, 1997, the Company's
financial instruments also include cash, receivables and accounts payable. At
December 31, 1997 the fair value of cash, receivables and accounts payable
approximates carrying values because of the short-term nature of these
instruments.
 
    Exploration: Tangible and intangible costs incurred in the search for
mineral properties are charged to expense when incurred.
 
    Taxes on Income: The Company's results of operations have been included in
the federal and certain state income tax returns of Asarco. The provisions for
income taxes in the financial statements has been calculated on a separate
- --company basis; income taxes paid on behalf of the Company are included in
divisional equity. Deferred income taxes reflect the future tax consequences of
differences between the tax bases of assets and liabilities and their financial
reporting amounts at each year-end.
 
    Reclamation Reserve: As the Company's mines approach the end of their ore
reserves and the costs of reclamation are estimable, the Company establishes a
reclamation reserve for restoration of mineral land to usable conditions. The
reserve is accrued for monthly, over the remaining life of the mine, based on
production.
 
    Impact of New Accounting Standards: In June 1997, the Financial Accounting
Standards Board ("FASB") issued SFAS No. 130, "Reporting Comprehensive Income."
This statement, which is effective for fiscal years beginning after December 15,
1997, requires the Company to make certain disclosures but will have no impact
on the Company's financial statements.
 
    In June 1997, the FASB issued SFAS No. 131 "Disclosures about Segments of an
Enterprise and Related Information." This statement, which is effective for
fiscal years beginning after December 15, 1997, is not expected to have any
impact on the Company's financial statements.
 
    In March 1998, the FASB issued SFAS No. 132 "Employers Disclosure about
Pensions and other Postretirement Benefits". This statement, which is effective
for fiscal years beginning after December 15, 1997, revises employers'
disclosures about pensions and other postretirement benefit plans but does not
change the measurement or recognition of those plans.
 
    In June 1998, the FASB issued SFAS No. 133 "Accounting for Derivative
Instruments and Hedging Activities". This statement, which is effective for all
fiscal quarters of fiscal years beginning after June 15, 1999, establishes
accounting and reporting standards for derivative instruments including certain
derivative instruments embedded in other contracts and hedging activities.
Management has not fully assessed what effect, if any, this statement will have
on the financial statements.
 
    Nature of Business and Concentration of Credit Risk: The Company's principal
business is the mining and processing of lead. The Company's primary product is
refined lead, the majority of which is consumed in storage batteries for
automobiles and other equipment, principally in the United States. A change in
refined lead consumption could have a material impact on the Company. The
Company's four largest
 
                                      F-76
<PAGE>
                             MISSOURI LEAD DIVISION
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
customers accounted for 19.3%, 19.1%, 13.2% and 10.4% of revenues in 1997 and
13.5%, 8.5%, 23.8% and 0% of accounts receivable at December 31, 1997.
 
(3) TAXES ON INCOME
 
    The components of the income tax expense (benefit) was:
 
<TABLE>
<CAPTION>
FOR THE YEARS ENDED DECEMBER 31,                                                          1997       1996       1995
- --------------------------------------------------------------------------------------  ---------  ---------  ---------
<S>                                                                                     <C>        <C>        <C>
U.S. Federal:
  Current.............................................................................  $     768  $   3,056  $   3,520
  Deferred............................................................................       (910)     1,199      1,431
                                                                                        ---------  ---------  ---------
                                                                                             (142)     4,255      4,951
                                                                                        ---------  ---------  ---------
State:
  Current.............................................................................         78        626        643
  Deferred............................................................................       (104)       137        164
                                                                                        ---------  ---------  ---------
                                                                                              (26)       763        807
                                                                                        ---------  ---------  ---------
Total income tax expense (benefit)....................................................  $    (168) $   5,018  $   5,758
                                                                                        ---------  ---------  ---------
                                                                                        ---------  ---------  ---------
</TABLE>
 
    Total taxes paid by Asarco and charged to the Company were: 1997--$846;
1996--$3,682; 1995-- $4,163.
 
    Following is a reconciliation of the U.S statutory income tax rate to the
Company's effective tax rate:
 
<TABLE>
<CAPTION>
FOR THE YEARS ENDED DECEMBER 31,                                                         1997       1996       1995
- -------------------------------------------------------------------------------------  ---------  ---------  ---------
<S>                                                                                    <C>        <C>        <C>
U.S. statutory income tax rate.......................................................       35.0%      35.0%      35.0%
Percentage depletion.................................................................      (39.1)     (16.2)     (15.9)
Fines and penalties..................................................................     --            0.3        2.2
State taxes, net of federal effect...................................................       (0.5)       2.1        2.1
                                                                                       ---------  ---------  ---------
Effective income tax rate............................................................       (4.6)%      21.2%      23.4%
                                                                                       ---------  ---------  ---------
                                                                                       ---------  ---------  ---------
</TABLE>
 
    Deferred income taxes arise from temporary differences between the tax bases
of assets and liabilities and their reported amounts in the financial
statements. The deferred tax liability relates to the depreciation and depletion
of property, plant and equipment.
 
(4) INTERCOMPANY TRANSACTIONS
 
    Asarco uses a centralized cash management system to finance its operations.
Cash deposits from the Company's business are transferred to Asarco on a daily
basis and Asarco funds the Company's disbursement bank accounts as required. No
interest has been charged on these transactions.
 
    Asarco provided certain centralized services (see Note 1 to the financial
statements) to the Company. Expenses related to these services were allocated to
the Company based on utilization of specific services or, where an estimate
could not be determined, based on the Company's operating expenses in proportion
to Asarco's total operating expenses. Management believes these allocation
methods are reasonable.
 
                                      F-77
<PAGE>
                             MISSOURI LEAD DIVISION
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(4) INTERCOMPANY TRANSACTIONS (CONTINUED)
However, the costs of these services and benefits charged to the Company are not
necessarily indicative of the costs that would have been incurred if the Company
had performed or provided these services and benefits as a separate entity.
These allocations were $6,048, $8,449 and $8,826 in 1997, 1996 and 1995,
respectively and are included in the Statement of Operations. Amounts due to
Asarco for these expenses are included in divisional equity.
 
    The following table summarizes the expenses allocated to the Company by
Asarco.
 
<TABLE>
<CAPTION>
FOR THE YEARS ENDED DECEMBER 31,                                                         1997       1996       1995
- -------------------------------------------------------------------------------------  ---------  ---------  ---------
<S>                                                                                    <C>        <C>        <C>
General & administrative.............................................................  $   4,114  $   3,663  $   3,819
Pension expense......................................................................        411        454        316
Postretirement benefit expense.......................................................        360        360        266
Current income taxes.................................................................        846      3,682      4,163
Savings plan contributions...........................................................        317        290        262
</TABLE>
 
    The Company has a contract with an environmental services subsidiary of
Asarco for the treatment and disposal of an intermediate product. The net
treatment cost paid by the Company is dependent upon the quantities and value of
salable metal contained in the material. The Company paid $1,800, $2,100 and
$100 in 1997, 1996 and 1995, respectively, to the subsidiary under the contract.
In addition, the Company sells refined lead to a specialty metals subsidiary of
Asarco. Total revenues received for these sales were $1,033, $904 and $767 in
1997, 1996 and 1995, respectively. Contracts between the Company and related
parties are at market terms.
 
(5) COMMITMENTS
 
    Minimum future rental payments under non-cancelable operating leases having
remaining terms in excess of one year as of December 31, 1997 for each of the
next five years and in the aggregate are:
 
<TABLE>
<CAPTION>
YEAR                                                             AMOUNT
- ----------------------------------------------------------  -----------------
<S>                                                         <C>
1998......................................................      $      91
1999......................................................             91
2000......................................................             91
2001......................................................             28
2002......................................................              8
Thereafter................................................             25
                                                                $     334
</TABLE>
 
    Total rental expense was $305 in 1997, $211 in 1996 and $254 in 1995.
 
    At December 31, 1997 the Company was committed to the completion of
construction on equipment projects with a value of $448.
 
    The Company is subject to a lease agreement with an owner of land which
contains a portion of the Company's Sweetwater mine. Under the terms of the
lease, the lessors are entitled to certain royalties. A monthly royalty is paid
based on a net profit per ton of ore subject to certain limitation, as defined.
In addition, an annual royalty is paid based upon the number of acres leased, as
defined. The lease expires in
 
                                      F-78
<PAGE>
                             MISSOURI LEAD DIVISION
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(5) COMMITMENTS (CONTINUED)
June 2012 and is renewable at the option of the Company for an additional fifty
years. The total royalties paid by the Company were $27, $86 and $95 in 1997,
1996 and 1995, respectively.
 
(6) BENEFIT PLANS
 
    The Company participates in the Asarco non-contributory, defined benefit
pension plan which covers substantially all domestic employees. Benefits for
salaried employees are based on salary and years of service. Benefits for hourly
employees are based on negotiated benefits and years of service. The Company
accounts for the plan as a multi-employer plan. Accordingly, the Company has
recorded pension costs as allocated by Asarco totaling $411, $454 and $316 in
1997, 1996 and 1995, respectively. The assumptions of the multi-employer plan
are described below.
 
    The weighted average expected long-term rate of return on pension plan
assets was 10% for 1997 and 1996 and 8% for 1995. At December 31, 1997 and 1996,
the projected benefit obligations were determined using a weighted average
discount rate of 7% and weighted average rates of increase in future
compensation levels of 4%. Plan assets are invested principally in commingled
stock funds, mutual funds and securities issued by the United States.
 
    In addition to providing pension benefits, Asarco provides health care
coverage under the Asarco Health Plan to substantially all U.S. retirees not
eligible for Medicare. A cost sharing Medicare supplemental plan is available
for retired salaried employees and life insurance coverage is provided to
substantially all retirees. Employees are eligible for these benefits if they
reach normal retirement age while working for the Company.
 
    The Company accounts for the plan as a multi-employer plan. Accordingly, the
Company has recorded post-retirement benefits costs as allocated by Asarco
totaling $360 in 1997 and 1996 and $226 in 1995. The accumulated post-retirement
benefit obligation at December 31, 1997 and 1996 was determined using discount
rates of 7%. The assumed rate of future increases in per capita cost of covered
health care benefits is 6% for 1997, decreasing to 5% by 1999 and remaining at
that level thereafter.
 
    EMPLOYEE SAVINGS PLAN:
 
    The Company participates in the employee savings plans for salaried and
hourly employees maintained by Asarco. These plans permit employees to make
contributions by salary reduction pursuant to section 401(k) of the Internal
Revenue Code. Asarco matches contributions up to 3% of compensation. In
connection with the required match, Asarco's contributions, totalling $317 in
1997, $290 in 1996 and $262 in 1995, were allocated to the Company and charged
to expense.
 
(7) CONTINGENCIES AND LITIGATION
 
    The operations of the Company are subject to stringent federal, state and
local laws and regulations, including those relating to improving or maintaining
environmental quality and those relating to plant and mine safety and health
conditions. Although the Company believes that it is currently in substantial
compliance with material laws and regulations, it is possible that substantial
additional expenditures in the future may be required to comply with such
legislation and regulations. In light of the frequent changes in such laws and
regulations and the uncertainty inherent in this area, the Company is unable to
estimate accurately the total amount of future expenditures.
 
                                      F-79
<PAGE>
                             MISSOURI LEAD DIVISION
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                             (DOLLARS IN THOUSANDS)
 
(7) CONTINGENCIES AND LITIGATION (CONTINUED)
    The Company is involved in pending litigation in the ordinary course of its
business. It is the opinion of management that the outcome of the legal
proceedings and environmental contingencies mentioned will not materially
adversely affect the financial position of the Company. However, it is possible
that litigation and environmental contingencies could have a material effect on
quarterly or annual operating results, when they are resolved in future periods.
This opinion is based on considerations including experience related to previous
court judgments and settlements and remediation costs and terms.
 
(8) SUBSEQUENT EVENT
 
    On July 28, 1998, Asarco entered into an asset purchase and sale agreement
pursuant to which Asarco will sell certain assets of the Company to The Doe Run
Resources Corporation, a subsidiary of The Renco Group, Inc. The assets to be
sold include the lead smelter and refinery and two mines and associated
equipment.
 
                                      F-80
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors of
ASARCO Incorporated
 
We have reviewed the accompanying interim condensed balance sheet of the
Missouri Lead Division as of March 31, 1998 and the related interim condensed
statements of operations and cash flows for the three month period ended March
31, 1998 and 1997. These interim condensed consolidated financial statements are
the responsibility of the Company's management.
 
We conducted our review in accordance with standards established by the American
Institute of Certified Public Accountants. A review of interim financial
information consists principally of applying analytical procedures to financial
data and making inquiries of persons responsible for financial and accounting
matters. It is substantially less in scope than an audit conducted in accordance
with generally accepted auditing standards, the objective of which is the
expression of an opinion regarding the financial statements taken as a whole.
Accordingly, we do not express such an opinion.
 
Based on our review, we are not aware of any material modifications that should
be made to the accompanying interim condensed consolidated financial statements
for them to be in conformity with generally accepted accounting principles.
 
New York, New York
July 28, 1998
 
                                      F-81
<PAGE>
                             MISSOURI LEAD DIVISION
 
                       CONDENSED STATEMENTS OF OPERATIONS
 
                                  (UNAUDITED)
 
                      FOR THE THREE MONTHS ENDED MARCH 31,
 
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                1998       1997
                                                                                              ---------  ---------
<S>                                                                                           <C>        <C>
Revenues....................................................................................  $  17,165  $  20,296
                                                                                              ---------  ---------
Cost of sales...............................................................................     14,944     15,717
General and administrative..................................................................      1,074      1,148
Depreciation and depletion..................................................................      2,097      1,938
Research....................................................................................         69         87
                                                                                              ---------  ---------
Operating expenses..........................................................................     18,184     18,890
                                                                                              ---------  ---------
Earnings (loss) before income taxes.........................................................     (1,019)     1,406
Income tax benefit..........................................................................       (437)      (106)
                                                                                              ---------  ---------
Net earnings (loss).........................................................................  $    (582) $   1,512
                                                                                              ---------  ---------
                                                                                              ---------  ---------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-82
<PAGE>
                             MISSOURI LEAD DIVISION
 
                            CONDENSED BALANCE SHEETS
 
                                  (UNAUDITED)
 
                                AS OF MARCH 31,
 
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                             1998         1997
                                                                                          -----------  -----------
<S>                                                                                       <C>          <C>
Cash....................................................................................  $        86  $        33
Receivables, net of allowance for doubtful accounts
  of $150 for 1998 and 1997.............................................................        8,407        7,640
Metal inventories.......................................................................        5,053        9,429
Supply inventories......................................................................        5,669        5,948
Other current assets....................................................................          149          167
                                                                                          -----------  -----------
      Current assets....................................................................       19,364       23,217
                                                                                          -----------  -----------
 
Mineral land............................................................................       30,542       30,505
Buildings...............................................................................       37,283       35,112
Machinery and equipment.................................................................       87,387       83,846
                                                                                          -----------  -----------
      Total cost........................................................................      155,212      149,463
Accumulated depreciation and depletion..................................................      (91,477)     (83,491)
                                                                                          -----------  -----------
      Property, net.....................................................................       63,735       65,972
                                                                                          -----------  -----------
      Total assets......................................................................  $    83,099  $    89,189
                                                                                          -----------  -----------
                                                                                          -----------  -----------
 
Accounts payable and accrued expenses...................................................  $     4,328  $     7,808
Salaries and wages accrued..............................................................        1,084          771
Reserve for workers compensation........................................................        1,432        1,479
Other current liabilities...............................................................        1,419        1,442
                                                                                          -----------  -----------
      Current liabilities...............................................................        8,263       11,500
Reclamation reserve.....................................................................          675          134
Other non-current liabilities...........................................................           12           75
Deferred income taxes...................................................................        8,086        8,987
                                                                                          -----------  -----------
      Total liabilities.................................................................       17,036       20,696
      Divisional equity.................................................................       66,063       68,493
                                                                                          -----------  -----------
      Total liabilities and divisional equity...........................................  $    83,099  $    89,189
                                                                                          -----------  -----------
                                                                                          -----------  -----------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-83
<PAGE>
                             MISSOURI LEAD DIVISION
 
                       CONDENSED STATEMENTS OF CASH FLOWS
 
                                  (UNAUDITED)
 
                      FOR THE THREE MONTHS ENDED MARCH 31,
 
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                1997        1996
                                                                                              ---------  ----------
<S>                                                                                           <C>        <C>
OPERATING ACTIVITIES
Net earnings (loss).........................................................................  $    (582) $    1,512
Adjustments to reconcile net earnings (loss) to net cash provided from operating activities:
  Deferred income taxes.....................................................................       (141)       (254)
  Depreciation..............................................................................      2,097       1,938
  Cash provided from operating assets and liabilities:
      Accounts receivables..................................................................      1,007       9,327
      Accounts payable and accrued expenses.................................................       (945)       (947)
      Inventories...........................................................................        477      (1,101)
      Other assets and liabilities..........................................................         83         203
                                                                                              ---------  ----------
Net cash provided from operating activities.................................................      1,996      12,572
INVESTING ACTIVITIES
Capital expenditures........................................................................       (912)       (933)
                                                                                              ---------  ----------
Net cash used for investing activities......................................................       (912)       (933)
FINANCING ACTIVITIES
Net distributions to Asarco.................................................................     (1,230)    (11,698)
                                                                                              ---------  ----------
Net cash used for financing activities......................................................     (1,230)    (11,698)
Decrease in cash............................................................................       (146)        (59)
Cash at beginning of the period.............................................................        232          92
                                                                                              ---------  ----------
Cash at end of the period...................................................................  $      86  $       33
                                                                                              ---------  ----------
                                                                                              ---------  ----------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.
 
                                      F-84
<PAGE>
                             MISSOURI LEAD DIVISION
 
                    NOTES TO CONDENSED FINANCIAL STATEMENTS
                                  (UNAUDITED)
 
A.
 
    The Missouri Lead Division ("the Company") is an unincorporated division of
Asarco Incorporated ("Asarco"). The financial statements reflect the financial
position, results of operations, and cash flows of the Company as if it were a
separate entity for all periods presented. The financial statements include
allocations of certain Asarco corporate headquarters expenses (including cash
management, legal, accounting, tax, employee benefits, insurance services, data
services and other Asarco corporate overhead). Management believes these
allocations are reasonable. However, the costs of these services and benefits
charged to the Company are not necessarily indicative of the costs that would
have been incurred if the Company had performed or provided these functions as a
separate entity.
 
    The financial information included herein may not necessarily reflect the
results of operations, financial position, changes in shareholder equity and
cash flows of the Company in the future or what they would have been had it been
a separate stand-alone entity during the periods presented.
 
B.
 
    In the opinion of the Company, the accompanying unaudited financial
statements contain all adjustments necessary to present fairly the Company's
financial position as of March 31, 1998 and 1997 and the results of operations
and cash flows for the three months ended March 31, 1998 and 1997. This
financial data has been subjected to a review by PricewaterhouseCoopers L.L.P.,
the Company's independent accountants. The results of operations for the three
month period are not necessarily indicative of the results to be expected for
the full year.
 
C. FINANCIAL INSTRUMENTS:
 
    The Company may use derivative instruments to manage its exposure to market
risk from changes in commodity prices or the value of its assets and
liabilities. Derivative instruments which are designated as hedges must be
deemed effective at reducing the risk associated with the exposure being hedged
and must be designated as a hedge at the inception of the contract. Gains and
losses on such instruments are reported as a component of the underlying
transaction. There were no hedging gains or losses for the three months ended
March 31, 1998 or 1997. At March 31, 1998, the Company's financial instruments
also include cash, receivables and accounts payable. At March 31, 1998 the fair
value of cash, receivables and accounts payable approximates carrying values
because of the short-term nature of these instruments.
 
D. INCOME TAXES:
 
    The income tax benefit in 1997 is primarily a result of the percentage
depletion benefit arising from the Company's mine earnings.
 
E. CONTINGENCIES AND LITIGATION:
 
    The operations of the Company are subject to stringent federal, state and
local laws and regulations, including those relating to improving or maintaining
environmental quality and those relating to plant and mine safety and health
conditions. Although the Company believes that it is currently in substantial
compliance with material laws and regulations, it is possible that substantial
additional expenditures in the future may be required to comply with such
legislation and regulations. In light of the frequent changes in
 
                                      F-85
<PAGE>
                             MISSOURI LEAD DIVISION
 
                    NOTES TO CONDENSED FINANCIAL STATEMENTS
                            (UNAUDITED) (CONTINUED)
 
E. CONTINGENCIES AND LITIGATION: (CONTINUED)
such laws and regulations and the uncertainty inherent in this area, the Company
is unable to estimate accurately the total amount of future expenditures.
 
    The Company is involved in pending litigation in the ordinary course of its
business. It is the opinion of management that the outcome of the legal
proceedings and environmental contingencies mentioned, will not materially
adversely affect the financial position of the Company. However, it is possible
that litigation and environmental contingencies could have a material effect on
quarterly or annual operating results, when they are resolved in future periods.
This opinion is based on considerations including experience related to previous
court judgments and settlements and remediation costs and terms.
 
F. SUBSEQUENT EVENTS:
 
    On July 28, 1998, Asarco entered into an asset purchase and sale agreement
pursuant to which Asarco will sell certain assets of the Company to The Doe Run
Resources Corporation, a subsidiary of The Renco Group, Inc. The assets to be
sold include the lead smelter and refinery and two mines and associated
equipment.
 
                                      F-86
<PAGE>
                      GLOSSARY OF CERTAIN METALLURGY TERMS
 
    "Anode copper" means copper blister that, in a furnace, has been blown with
air and natural gas to upgrade its purity to approximately 99.0% copper, which
is then cast into keystone shaped slabs that are shipped to an electrolytic
refinery.
 
    "Bullion" means unrefined raw metals containing impurities.
 
    "By-products" means the products recovered during the refining process, such
as silver, germanium and indium, which may produce gains for the smelter.
 
    "Cathode" means the electrolytically refined form of copper removed from the
refining cells in the refining process that are sold "as is" or melted and cast
into cakes, billets, wirebar or rods.
 
    "Concentrates" means ores that have been crushed, ground and treated in a
flotation process that separates and concentrates the minerals creating the raw
material for smelting.
 
    "Converter" means a principal phase of the smelting process that involves
the blowing of oxygen-enriched air through molten metal, causing oxidation and
the removal of sulfur and other impurities.
 
    "Copper blister" means the material resulting from passing copper
concentrates through a converter that is approximately 98.5% copper and takes
its name from "blisters" that form on the surface.
 
    "Electrolytic refining" means the process of placing copper anodes
alternately with refined copper sheets in a tank through which a copper sulfate
solution and sulfuric acid are circulated and a low voltage current is
introduced that causes the copper metal to transfer from the anodes to the pure
copper sheets, producing 99.9% copper cathodes.
 
    "Electrowinning" means the process of removing metal from solution by the
action of electric currents.
 
    "Flotation" means the process by which minerals attach themselves to the
bubbles in an oily froth and rise to the top where they are skimmed off.
 
    "Flux" means inert oxides of iron, calcium, silica added to the charge to be
smelted or pyrometallurgically converted to assist with the creation of a molten
slag to assist separation of the metal from the low melting molten oxides.
 
    "Galvanizing" means the anti-corrosion process for steel components that
consists of dipping components in a molten zinc bath after chemically stripping
off impurities.
 
    "Leaching" means the process of extracting a metal from ores via
hydrometallurgical techniques by dissolving the metal into a solution for
subsequent treatment or recovery.
 
    "Lead/zinc bullion" means unrefined raw metals containing impurities.
 
    "Ore" means a mineral or aggregate of minerals from which metal can be
economically mined or extracted.
 
    "Refining" means the chemical or metallurgical steps required to purify a
metal or compound into a commercially usable product.
 
    "Reverberatory furnace" means a furnace with a shallow hearth and a roof
which deflects the flame and radiates heat toward the hearth or the surface of
the charge.
 
    "Residues" means impurities remaining after the metallurgical treatment of
concentrates.
 
    "Secondary materials" means products obtained from residues resulting from
the primary smelting process or other industrial activities containing metals
which can be recycled.
 
                                      G-1
<PAGE>
    "Sintering" means the agglomeration and desulfurization of concentrates into
a lumpy product suitable for smelting in a blast furnace.
 
    "Slag" means complex silicates formed mainly by silica, iron oxide and lime
that are residues collected from the blast furnace.
 
    "Smelting" means a pyrometallurgical process of separating metal by fusion
from, those impurities with which it may be chemically combined or physically
mixed.
 
    "Treatment charges" means the amount of money charged per ton of concentrate
by the smelter (buyer) to the miner (seller) to cover the cost (plus profit) for
processing the concentrate.
 
    "Zinc electrolytic process" means the hydrometallurgical process consisting
of the electrolysis of a purified zinc sulfate solution (which is obtained by
dissolving zinc oxidized concentrates in sulfuric acid) and obtaining a zinc
deposit on aluminum cathodes.
 
    "Zinc oxide" means the oxide of zinc normally produced as a fine white power
used mainly as a catalyst for the vulcanization of rubber and also used in paint
pigments and as compounds in the pharmaceutical industry.
 
                                      G-2
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
    NO DEALER, SALESPERSON, OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS IN CONNECTION WITH THE OFFER
CONTAINED HEREIN, OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN
OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING
BEEN AUTHORIZED BY DOE RUN OR THE GUARANTORS. THIS PROSPECTUS DOES NOT
CONSTITUTE AN OFFER TO SELL, OR THE SOLICITATION OF AN OFFER TO BUY, TO ANY
PERSON IN ANY JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION IS NOT
AUTHORIZED, OR IN WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION IS NOT
QUALIFIED TO DO SO, OR TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER
OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE
HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS
BEEN NO CHANGE IN THE AFFAIRS OF DOE RUN OR THE GUARANTORS SINCE THE DATE HEREOF
OR THAT THE INFORMATION CONTAINED HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO
THE DATE HEREOF.
 
                           --------------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
Available Information..........................           3
Special Note Regarding Forward-Looking
  Statements...................................           3
Enforceability of Civil Liabilities............           3
Presentation of Certain Financial Information..           4
Exchange Rates.................................           4
Prospectus Summary.............................           6
Risk Factors...................................          21
Use of Proceeds................................          29
Capitalization.................................          30
Unaudited Pro Forma Consolidated Financial
  Data.........................................          31
Selected Historical Consolidated Financial
  Data.........................................          38
The Exchange Offer.............................          42
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations...................................          49
Industry.......................................          60
Business.......................................          64
Management.....................................          99
Security Ownership.............................         103
Certain Transactions...........................         104
Description of New Revolving Credit
  Facilities...................................         106
Description of the Notes.......................         109
Certain U.S. Federal Income Tax
  Considerations...............................         136
Plan of Distribution...........................         136
Legal Matters..................................         137
Experts........................................         137
Index to Consolidated Financial Statements.....         F-1
Glossary of Certain Metallurgy Terms...........         G-1
</TABLE>
    
 
                           --------------------------
 
    UNTIL            , 1998 (40 DAYS AFTER THE DATE OF THIS PROSPECTUS) ALL
DEALERS EFFECTING TRANSACTIONS IN THE EXCHANGE NOTES, WHETHER OR NOT
PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS.
THIS IS IN ADDITION TO THE OBLIGATION OF DEALERS TO DELIVER A PROSPECTUS WHEN
ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR
SUBSCRIPTIONS.
 
                                     [LOGO]
 
                             OFFER TO EXCHANGE ITS
                              11 1/4% SENIOR NOTES
                               DUE 2005, SERIES B
                                      AND
                      FLOATING INTEREST RATE SENIOR NOTES
                              DUE 2003, SERIES B,
                        WHICH HAVE BEEN REGISTERED UNDER
                          THE SECURITIES ACT OF 1933,
                                  AS AMENDED,
                       FOR ANY AND ALL OF ITS OUTSTANDING
                              11 1/4% SENIOR NOTES
                               DUE 2005, SERIES A
                                      AND
                      FLOATING INTEREST RATE SENIOR NOTES
                              DUE 2003, SERIES A,
                                  RESPECTIVELY
 
                             ---------------------
 
                                   PROSPECTUS
 
                             ---------------------
 
                                          , 1998
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
    Sections 722 and 723 of the Business Corporation Law of New York (the
"NYBCL") empower The Doe Run Resources Corporation, a New York corporation ("Doe
Run"), to indemnify, subject to the limitations and standards set forth therein,
any person made or threatened to be made a party to an action or proceeding
brought or threatened by reason of the fact that such person is or was a
director or officer of Doe Run, Section 726 of the NYBCL provides that Doe Run
may purchase insurance on behalf of any such director or officer. Article V of
Doe Run's By-Laws provides, in effect, for the indemnification by Doe Run of
each director, officer, employee or agent of Doe Run to the full extent
permitted by the NYBCL.
 
    The By-Laws of Doe Run provide, in effect, that Doe Run shall indemnify any
person made, or threatened to be made, a party to an action or proceeding,
whether civil or criminal, including an action by or in the right of Doe Run to
procure a judgment in its favor and an action by or in the right of any other
corporation of any type or kind, domestic or foreign, or any partnership, joint
venture, trust, employee benefit plan or any other enterprise which any director
or officer of Doe Run served in any capacity at the request of Doe Run, by
reason of the fact that he, his testator or intestate is or was a director or
officer of Doe Run, or served such other corporation, partnership, joint
venture, trust, employee benefit plan or other enterprise in any capacity,
against judgments, fines, amounts paid in settlement and reasonable expenses,
including attorneys' fees, actually and necessarily incurred as a result of such
action or proceeding or any appeal therein.
 
    Subsection (a) of Section 145 of the General Corporation Law of Delaware
(the "DGCL") empowers a corporation to indemnify any person who was or is a
party or is threatened to be made a party to any threatened, pending or complete
action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation) by
reason of the fact that he is or was a director, employee or agent of the
corporation or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement actually and reasonably
incurred by him in connection with such action, suit or proceeding if he acted
in good faith and in a manner he reasonably believed to be in or not opposed to
the best interests of the corporation and, with respect to any criminal action
or proceeding, had no cause to believe his conduct was unlawful.
 
    Subsection (b) of Section 145 of the DGCL empowers a corporation to
indemnify any person who was or is a party or is threatened to be made a party
to any threatened, pending or completed action or suit by or in the right of the
corporation to procure a judgment in its favor by reason of the fact that such
person acted in any of the capacities set forth above, against expenses
(including attorneys' fees) actually and reasonably incurred by him in
connection with the defense or settlement of such action or suit if he acted in
good faith and in a manner he reasonably believed to be in or not opposed to the
best interests of the corporation and except that no indemnification may be made
in respect to any claim, issue or matter as to which such person shall have been
adjudged to be liable to the corporation unless and only to the extent that the
Court of Chancery or the court in which such action or suit was brought shall
determine that despite the adjudication of liability such person is fairly and
reasonably entitled to indemnity for such expenses which the court shall deem
proper.
 
    Section 145 of the DGCL further provides that to the extent a director,
officer, employee or agent of a corporation has been successful in the defense
of any action, suit or proceeding referred to in subsections (a) and (b) or in
the defense of any claim, issue or matter therein, he shall be indemnified
against expenses
 
                                      II-1
<PAGE>
(including attorneys' fees) actually and reasonably incurred by him in
connection therewith; that indemnification or advancement of expenses provided
for by Section 145 shall not be deemed exclusive of any other rights to which
the indemnified party may be entitled; and empowers the corporation to purchase
and maintain insurance on behalf of a director, officer, employee or agent of
the corporation against any liability asserted against him or incurred by him in
any such capacity or arising out of his status as such whether or not the
corporation would have the power to indemnify him against such liabilities under
Section 145.
 
    The Certificate of Incorporation of Fabricated Products, Inc., a Delaware
corporation ("FPI"), provides that a director of FPI shall not be personally
liable to FPI or its stockholders for monetary damages for breach of fiduciary
duty as a director except for liability (i) for any breach of the director's
duty of loyalty to FPI or its stockholders, (ii) for acts or omissions not in
good faith or which involve intentional misconduct or a knowing violation of
law, (iii) under Section 174 of the DGCL or (iv) for any transaction from which
the director derives an improper personal benefit.
 
    The Bylaws of FPI provide, in effect, that FPI shall indemnify every person
who was or is a party, or is or was threatened to be made a party, to any
action, suit, or proceeding, whether civil, criminal, administrative, or
investigative, by reason of the fact that he or she is or was a director,
officer, employee, or agent of FPI, or is or was serving at the request of FPI
as a director, officer, employee, or agent of another corporation, partnership,
joint venture, trust, employee benefit plan, or other enterprise, against
expenses (including attorneys' fees), judgments, fines, and amounts paid in
settlement actually and reasonably incurred by him in connection with such
action, suit, or proceedings, to the fullest extent permitted by applicable law.
Such indemnifications may, in the discretion of the board of directors, include
advances of the person's expenses in advance of final disposition of such
action, suit, or proceeding, subject to the provisions of any applicable
statute. FPI is empowered to purchase and maintain insurance on behalf of any
person who is or was a director, officer, employee, or agent of FPI, or is or
was serving at the request of FPI as a director, officer, employee, or agent of
another corporation, partnership, joint venture, trust, or other enterprise,
against any liability incurred by such person in such capacity, or arising out
of such person's capacity.
 
    The Companies Law (1995 Revision) of the Cayman Islands does not set out any
specific restrictions on the ability of a company to indemnify officers or
directors. However, the application of basic principles and certain Commonwealth
case law, which is likely to be persuasive in the Cayman Islands, would indicate
that indemnification is generally permissible except in the event that there had
been fraud or willful default on the part of the officer or director or reckless
disregard of his duties and obligations to the company.
 
    Article 123 of the Articles of Association of Doe Run Cayman Ltd., a Cayman
Islands company ("Doe Run Cayman"), provides, in effect, that Doe Run Cayman
shall indemnify the directors and officers of Doe Run Cayman and any trustees
acting in relation to any of the affairs of Doe Run Cayman and their heirs,
executors, administrators and personal representatives respectively from and
against all actions, proceedings, costs, charges, losses, damages and expenses
which they or any of them shall or may incur or sustain by reason of any act
done or omitted in or about the execution of their duty in their respective
offices or trusts, except such (if any) as they shall incur or sustain by or
through their own wilful neglect or default respectively.
 
    Peruvian law does not provide for the indemnification of officers of
companies organized as Sociedades de Responsibilidad Limitada, which do not have
directors. The Constituciones de Sociedad Comercial de Responsibilidad Limitada
for Doe Run Mining S.R. Ltda. and Doe Run Peru S.R. Ltda. do not contain any
provisions regarding the indemnification of officers.
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
    (a) Exhibits.
 
                                      II-2
<PAGE>
 
   
<TABLE>
<CAPTION>
  EXHIBIT
    NO.                                                             DESCRIPTION
- -----------             ----------------------------------------------------------------------------------------------------
<S>          <C>        <C>
       2.1   --         Asset Purchase and Sale Agreement, dated as of July 28, 1998, between ASARCO Incorporated and The
                        Doe Run Resources Corporation for the Missouri Lead Division and the Sugar Creek Project.*
       3.1   --         Certificate of Incorporation of The Doe Run Resources Corporation.*
       3.2   --         Amended and Restated By-laws of The Doe Run Resources Corporation.*
       3.3   --         Certificate of Incorporation of Fabricated Products, Inc.*
       3.4   --         Bylaws of Fabricated Products, Inc.*
       3.5   --         Certificate of Incorporation of Doe Run Cayman Ltd.*
       3.6   --         Memorandum and Articles of Association of Doe Run Cayman Ltd.*
       3.7   --         Constitucion de Sociedad Comercial de Responsibilidad Limitada de Doe Run Mining S.R. Ltda. (with
                        English translation)*
       3.8   --         Constitucion de Sociedad Comercial de Responsibilidad Limitada de Doe Run Peru S.R. Ltda. (with
                        English translation)*
       4.1   --         Indenture, dated as of March 12, 1998, by and among the Registrants and State Street Bank and Trust
                        Company, as trustee, relating to the 11 1/4% Senior Notes due 2005, Series A, Floating Interest Rate
                        Senior Notes due 2003, Series A, 11 1/4% Senior Notes due 2005, Series B and Floating Interest Rate
                        Senior Notes due 2003, Series B and the Guarantees thereof (containing, as exhibits, specimens of
                        the Notes and the Guarantees).*
       4.2   --         Purchase Agreement, dated March 6, 1998, among the Registrants, BT Alex. Brown Incorporated,
                        Donaldson, Lufkin and Jenrette Securities Corporation and UBS Securities LLC, relating to the
                        11 1/4% Senior Notes due 2005 and Floating Interest Rate Senior Notes due 2003.*
       4.3   --         Registration Rights Agreement, dated as of March 12, 1998, by and among the Registrants, BT Alex.
                        Brown Incorporated, Donaldson, Lufkin & Jenrette Securities Corporation and UBS Securities LLC,
                        relating to the 11 1/4% Senior Notes due 2005 and Floating Interest Rate Senior Notes due 2003.*
       4.4   --         Form Letter of Transmittal.*
       5.1   --         Opinion of Cadwalader, Wickersham & Taft.*
       8.1   --         Opinion of Cadwalader, Wickersham & Taft (included in Exhibit 5.1).*
    10.1.1   --         Employment Agreement, dated as of April 7, 1994, between The Doe Run Resources Corporation and
                        Jeffrey L. Zelms.*
    10.1.2   --         Employment Agreement, dated as of April 7, 1994, between The Doe Run Resources Corporation and
                        Marvin K. Kaiser.*
    10.1.3   --         Employment Agreement, dated as of April 7, 1994, between The Doe Run Resources Corporation and
                        Richard L. Amistadi.*
    10.1.4   --         Employment Agreement, dated as of April 7, 1994, between The Doe Run Resources Corporation and Gary
                        E. Boyer.*
    10.1.5   --         Employment Agreement, dated as of January 1, 1996, between The Doe Run Resources Corporation and
                        Kenneth R. Buckley.*
    10.2.1   --         Net Worth Appreciation Agreement, dated as of April 7, 1994, as amended, between The Doe Run
                        Resources Corporation and Jeffrey L. Zelms.*
    10.2.2   --         Net Worth Appreciation Agreement, dated as of April 7, 1994, as amended, between The Doe Run
                        Resources Corporation and Marvin K. Kaiser.*
    10.2.3   --         Net Worth Appreciation Agreement, dated as of April 7, 1994, as amended, between The Doe Run
                        Resources Corporation and Richard L. Amistadi.*
    10.2.4   --         Net Worth Appreciation Agreement, dated as of April 7, 1994, as amended, between The Doe Run
                        Resources Corporation and Gary E. Boyer.*
    10.2.5   --         Net Worth Appreciation Agreement, dated as of April 7, 1994, as amended, between The Doe Run
                        Resources Corporation and Kenneth R. Buckley.*
      10.3   --         The Doe Run Resources Corporation Supplemental Employee Retirement Plan.*
      10.4   --         The Doe Run Company Executive Tax Services Plan.*
      10.5   --         Loan and Security Agreement, dated March 12, 1998, by and among The Doe Run Resources Corporation,
                        Fabricated Products, Inc. and Congress Financial Corporation.*
</TABLE>
    
 
                                      II-3
<PAGE>
   
<TABLE>
<CAPTION>
  EXHIBIT
    NO.                                                             DESCRIPTION
- -----------             ----------------------------------------------------------------------------------------------------
<S>          <C>        <C>
      10.6   --         Contrato de Transferencia de Acciones, Aumento del Capital Social y Suscripcion de Acciones de La
                        Empresa Metalurgica La Oroya S.A. (Contract of Stock Transfer, Capital Increase and Stock
                        Subscription) (with English translation).*
      10.7   --         Programa de Adecuacion y Manejo Ambiental (Environmental Remedy and Management Program) (with
                        English translation).*
    10.8.1   --         Convenio de Estabilidad Juridica Entre el Estado y La Empresa Metalurgica La Oroya S.A. (Legal
                        Stability Agreement between the State and Empresa Metalurgica La Oroya S.A.) (with English
                        translation).*
    10.8.2   --         Convenio de Estabilidad Juridica con Doe Run Mining S.R. Ltda. (Legal Stability Agreement with Doe
                        Run Mining S.R. Ltda.--Commission for Foreign Investments and Technologies) (with English
                        translation).*
    10.8.3   --         Convenio de Estabilidad Juridica con Doe Run Mining S.R. Ltda. (Legal Stability Agreement with Doe
                        Run Mining S.R. Ltda.--Ministry of Energy and Mines) (with English translation).*
    10.8.4   --         Convenio de Estabilidad Juridica con Doe Run Peru S.R. Ltda. (Legal Stability Agreement with Doe Run
                        Peru S.R. Ltda.--Minister of Energy and Mines) (with English translation).*
    10.8.5   --         Convenio de Estabilidad Juridica con Doe Run Peru S.R. Ltda. (Legal Stability Agreement with Doe Run
                        Peru S.R. Ltda.--Vice Minister of Mines) (with English translation).*
    10.8.6   --         Convenio de Estabilidad Juridica con Doe Run Cayman Ltd. (Legal Stability Agreement with Doe Run
                        Cayman Ltd.--Commission for Foreign Investments and Technologies) (with English translation).*
    10.8.7   --         Remite Contrato de Estabilidad Administrativa Ambiental (Environmental Stability Agreement) (with
                        English translation).*
      10.9   --         Contrato de Linea de Credito en Moneda Extranjero, (Contract for a Line of Credit in Foreign
                        Currency) dated June 11, 1998, between Banco de Credito del Peru and Doe Run Peru S.R. Ltda. (with
                        English translation).*
     10.10   --         Contrato de Afectacion en Garantia de Pagos y/o Cobranzas y de Cuentas Cobranza (Collection Account
                        Agreement) dated June 11, 1998, between Banco de Credito del Peru and Doe Run Peru Ltda. (with
                        English translation.)*
     10.11   --         Contrato de Prenda de Minerales (Ore Collateral Agreement) dated June 11, 1998, between Banco de
                        Credito del Peru and Doe Run Peru Ltda. (with English translation.)*
        12   --         Statement regarding computation of ratios.
      15.1   --         Letter from PricewaterhouseCoopers LLP regarding unaudited interim financial information.*
        21   --         List of Subsidiaries of Registrant.*
      23.1   --         Consent of Cadwalader, Wickersham & Taft (included in Exhibit 5.1).*
      23.2   --         Consent of KPMG Peat Marwick LLP.
      23.3   --         Consent of Medina, Zaldivar y Asociados S. Civ. R.L., a member firm of Andersen Worldwide SC.
      23.4   --         Consent of Pincock, Allen & Holt.
      23.5   --         Consent of PricewaterhouseCoopers LLP.
        24   --         Power of Attorney (included on the signature page).*
        25   --         Statement of Eligibility and Qualification on Form T-1 of State Street Bank and Trust Company.*
</TABLE>
    
 
- ------------------------
 
*   Previously filed.
 
                                      II-4
<PAGE>
    (b) Financial Statement Schedules.
 
    All schedules are omitted because they are not applicable or the required
information is shown in the consolidated financial statements or the notes
thereto.
 
ITEM 22. UNDERTAKINGS
 
    Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers or persons controlling any
Registrant pursuant to the foregoing provisions, each Registrant has been
informed that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is therefore unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by a Registrant of expenses
incurred or paid by a director, officer or controlling person of a Registrant in
the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, each Registrant will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question of whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.
 
    The undersigned Registrants hereby undertake:
 
        (1) To file, during any period in which offers or sales are being made,
    a post-effective amendment to this registration statement:
 
           (i) To include any prospectus required by section 10(a)(3) of the
       Securities Act of 1933;
 
           (ii) To reflect in the prospectus any facts or events arising after
       the effective date of the registration statement (or the most recent
       post-effective amendment thereof) which, individually or in the
       aggregate, represent a fundamental change in the information set forth in
       the registration statement. Notwithstanding the foregoing, any increase
       or decrease in volume of securities offered (if the total dollar value of
       securities offered would not exceed that which was registered) and any
       deviation from the low or high end of the estimated maximum offering
       range may be reflected in the form of prospectus filed with the
       Commission pursuant to Rule 424(b) if, in the aggregate, the changes in
       volume and price represent no more than a 20% change in the maximum
       aggregate offering price set forth in the "Calculation of Registration
       Fee" table in the effective registration statement.
 
           (iii) To include any material information with respect to the plan of
       distribution not previously disclosed in the registration statement or
       any material change to such information in the registration statement.
 
        (2) That, for the purpose of determining any liability under the
    Securities Act of 1933, each such post-effective amendment shall be deemed
    to be a new registration statement relating to the securities offered
    therein, and the offering of such securities at that time shall be deemed to
    be the initial bona fide offering thereof.
 
        (3) To remove from registration by means of a post-effective amendment
    any of the securities being registered which remain unsold at the
    termination of the offering.
 
    The undersigned Registrants hereby undertake to supply by means of a
post-effective amendment all information concerning a transaction, and the
company being acquired involved therein, that was not the subject of and
included in the registration statement when it became effective.
 
                                      II-5
<PAGE>
                                   SIGNATURES
 
   
    Pursuant to the requirements of the Securities Act of 1933, each of the
registrants has duly caused this registration statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of St. Louis,
State of Missouri, on August 13, 1998.
    
 
<TABLE>
<S>        <C>
THE DOE RUN RESOURCES CORPORATION
 
BY:                   /S/ JEFFREY L. ZELMS
           ------------------------------------------
                        JEFFREY L. ZELMS
              President and Chief Executive Officer
 
FABRICATED PRODUCTS, INC.
 
BY:                    /S/ DAVID A. CHAPUT
           ------------------------------------------
                         DAVID A. CHAPUT
                            President
 
DOE RUN CAYMAN LTD.
 
BY:                   /S/ JEFFREY L. ZELMS
           ------------------------------------------
                        JEFFREY L. ZELMS
                            President
 
DOE RUN MINING S.R. LTDA.
 
BY:                  /S/ KENNETH R. BUCKLEY
           ------------------------------------------
                       KENNETH R. BUCKLEY
                         General Manager
 
DOE RUN PERU S.R. LTDA.
 
BY:                  /S/ KENNETH R. BUCKLEY
           ------------------------------------------
                       KENNETH R. BUCKLEY
                         General Manager
</TABLE>
 
                                      II-6
<PAGE>
   
    Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities indicated on August 13, 1998
    
 
<TABLE>
<CAPTION>
          SIGNATURE                       TITLE
- ------------------------------  --------------------------
 
<C>                             <S>                         <C>
                       THE DOE RUN RESOURCES CORPORATION
 
     /s/ IRA LEON RENNERT
- ------------------------------  Chairman of the Board and
       IRA LEON RENNERT           Director
 
                                President and Chief
     /s/ JEFFREY L. ZELMS         Executive Officer
- ------------------------------    (Principal Executive
       JEFFREY L. ZELMS           Officer)
 
                                Vice President and Chief
     /s/ MARVIN K. KAISER         Financial Officer
- ------------------------------    (Principal Financial and
       MARVIN K. KAISER           Accounting Officer)
 
                FABRICATED PRODUCTS, INC.
 
     /s/ IRA LEON RENNERT
- ------------------------------  Chairman of the Board and
       IRA LEON RENNERT           Director
 
     /s/ DAVID A. CHAPUT
- ------------------------------  President (Principal
       DAVID A. CHAPUT            Executive Officer)
 
                                Vice President and Chief
     /s/ MARVIN K. KAISER         Financial Officer
- ------------------------------    (Principal Financial and
       MARVIN K. KAISER           Accounting Officer)
 
                   DOE RUN CAYMAN LTD.
 
     /s/ IRA LEON RENNERT
- ------------------------------  Chairman of the Board and
       IRA LEON RENNERT           Director
 
     /s/ JEFFREY L. ZELMS
- ------------------------------  President (Principal
       JEFFREY L. ZELMS           Executive Officer)
 
     /s/ MARVIN K. KAISER       Vice President (Principal
- ------------------------------    Financial and Accounting
       MARVIN K. KAISER           Officer)
</TABLE>
 
                                      II-7
<PAGE>
<TABLE>
<CAPTION>
          SIGNATURE                       TITLE
- ------------------------------  --------------------------
 
<C>                             <S>                         <C>
                DOE RUN MINING S.R. LTDA.
 
    /s/ KENNETH R. BUCKLEY
- ------------------------------  General Manager (Principal
      KENNETH R. BUCKLEY          Executive Officer)
 
     /s/ MARVIN K. KAISER       Finance Manager (Principal
- ------------------------------    Financial and Accounting
       MARVIN K. KAISER           Officer)
 
                 DOE RUN PERU S.R. LTDA.
 
    /s/ KENNETH R. BUCKLEY
- ------------------------------  General Manager (Principal
      KENNETH R. BUCKLEY          Executive Officer)
 
     /s/ MARVIN K. KAISER       Finance Manager (Principal
- ------------------------------    Financial and Accounting
       MARVIN K. KAISER           Officer)
</TABLE>
 
                                      II-8
<PAGE>
   
                                 EXHIBIT INDEX
    
 
   
<TABLE>
<CAPTION>
  EXHIBIT
    NO.                                                             DESCRIPTION
- -----------             ----------------------------------------------------------------------------------------------------
<S>          <C>        <C>
       2.1   --         Asset Purchase and Sale Agreement, dated as of July 28, 1998, between ASARCO Incorporated and The
                        Doe Run Resources Corporation for the Missouri Lead Division and the Sugar Creek Project.*
       3.1   --         Certificate of Incorporation of The Doe Run Resources Corporation.*
       3.2   --         Amended and Restated By-laws of The Doe Run Resources Corporation.*
       3.3   --         Certificate of Incorporation of Fabricated Products, Inc.*
       3.4   --         Bylaws of Fabricated Products, Inc.*
       3.5   --         Certificate of Incorporation of Doe Run Cayman Ltd.*
       3.6   --         Memorandum and Articles of Association of Doe Run Cayman Ltd.*
       3.7   --         Constitucion de Sociedad Comercial de Responsibilidad Limitada de Doe Run Mining S.R. Ltda. (with
                        English translation)*
       3.8   --         Constitucion de Sociedad Comercial de Responsibilidad Limitada de Doe Run Peru S.R. Ltda. (with
                        English translation)*
       4.1   --         Indenture, dated as of March 12, 1998, by and among the Registrants and State Street Bank and Trust
                        Company, as trustee, relating to the 11 1/4% Senior Notes due 2005, Series A, Floating Interest Rate
                        Senior Notes due 2003, Series A, 11 1/4% Senior Notes due 2005, Series B and Floating Interest Rate
                        Senior Notes due 2003, Series B and the Guarantees thereof (containing, as exhibits, specimens of
                        the Notes and the Guarantees).*
       4.2   --         Purchase Agreement, dated March 6, 1998, among the Registrants, BT Alex. Brown Incorporated,
                        Donaldson, Lufkin and Jenrette Securities Corporation and UBS Securities LLC, relating to the
                        11 1/4% Senior Notes due 2005 and Floating Interest Rate Senior Notes due 2003.*
       4.3   --         Registration Rights Agreement, dated as of March 12, 1998, by and among the Registrants, BT Alex.
                        Brown Incorporated, Donaldson, Lufkin & Jenrette Securities Corporation and UBS Securities LLC,
                        relating to the 11 1/4% Senior Notes due 2005 and Floating Interest Rate Senior Notes due 2003.*
       4.4   --         Form Letter of Transmittal.*
       5.1   --         Opinion of Cadwalader, Wickersham & Taft.*
       8.1   --         Opinion of Cadwalader, Wickersham & Taft (included in Exhibit 5.1).*
    10.1.1   --         Employment Agreement, dated as of April 7, 1994, between The Doe Run Resources Corporation and
                        Jeffrey L. Zelms.*
    10.1.2   --         Employment Agreement, dated as of April 7, 1994, between The Doe Run Resources Corporation and
                        Marvin K. Kaiser.*
    10.1.3   --         Employment Agreement, dated as of April 7, 1994, between The Doe Run Resources Corporation and
                        Richard L. Amistadi.*
    10.1.4   --         Employment Agreement, dated as of April 7, 1994, between The Doe Run Resources Corporation and Gary
                        E. Boyer.*
    10.1.5   --         Employment Agreement, dated as of January 1, 1996, between The Doe Run Resources Corporation and
                        Kenneth R. Buckley.*
    10.2.1   --         Net Worth Appreciation Agreement, dated as of April 7, 1994, as amended, between The Doe Run
                        Resources Corporation and Jeffrey L. Zelms.*
    10.2.2   --         Net Worth Appreciation Agreement, dated as of April 7, 1994, as amended, between The Doe Run
                        Resources Corporation and Marvin K. Kaiser.*
    10.2.3   --         Net Worth Appreciation Agreement, dated as of April 7, 1994, as amended, between The Doe Run
                        Resources Corporation and Richard L. Amistadi.*
    10.2.4   --         Net Worth Appreciation Agreement, dated as of April 7, 1994, as amended, between The Doe Run
                        Resources Corporation and Gary E. Boyer.*
    10.2.5   --         Net Worth Appreciation Agreement, dated as of April 7, 1994, as amended, between The Doe Run
                        Resources Corporation and Kenneth R. Buckley.*
      10.3   --         The Doe Run Resources Corporation Supplemental Employee Retirement Plan.*
</TABLE>
    
<PAGE>
   
<TABLE>
<CAPTION>
  EXHIBIT
    NO.                                                             DESCRIPTION
- -----------             ----------------------------------------------------------------------------------------------------
<S>          <C>        <C>
      10.4   --         The Doe Run Company Executive Tax Services Plan.*
      10.5   --         Loan and Security Agreement, dated March 12, 1998, by and among The Doe Run Resources Corporation,
                        Fabricated Products, Inc. and Congress Financial Corporation.*
      10.6   --         Contrato de Transferencia de Acciones, Aumento del Capital Social y Suscripcion de Acciones de La
                        Empresa Metalurgica La Oroya S.A. (Contract of Stock Transfer, Capital Increase and Stock
                        Subscription) (with English translation).*
      10.7   --         Programa de Adecuacion y Manejo Ambiental (Environmental Remedy and Management Program) (with
                        English translation).*
    10.8.1   --         Convenio de Estabilidad Juridica Entre el Estado y La Empresa Metalurgica La Oroya S.A. (Legal
                        Stability Agreement between the State and Empresa Metalurgica La Oroya S.A.) (with English
                        translation).*
    10.8.2   --         Convenio de Estabilidad Juridica con Doe Run Mining S.R. Ltda. (Legal Stability Agreement with Doe
                        Run Mining S.R. Ltda.--Commission for Foreign Investments and Technologies) (with English
                        translation).*
    10.8.3   --         Convenio de Estabilidad Juridica con Doe Run Mining S.R. Ltda. (Legal Stability Agreement with Doe
                        Run Mining S.R. Ltda.--Ministry of Energy and Mines) (with English translation).*
    10.8.4   --         Convenio de Estabilidad Juridica con Doe Run Peru S.R. Ltda. (Legal Stability Agreement with Doe Run
                        Peru S.R. Ltda.--Minister of Energy and Mines) (with English translation).*
    10.8.5   --         Convenio de Estabilidad Juridica con Doe Run Peru S.R. Ltda. (Legal Stability Agreement with Doe Run
                        Peru S.R. Ltda.--Vice Minister of Mines) (with English translation).*
    10.8.6   --         Convenio de Estabilidad Juridica con Doe Run Cayman Ltd. (Legal Stability Agreement with Doe Run
                        Cayman Ltd.--Commission for Foreign Investments and Technologies) (with English translation).*
    10.8.7   --         Remite Contrato de Estabilidad Administrativa Ambiental (Environmental Stability Agreement) (with
                        English translation).*
      10.9   --         Contrato de Linea de Credito en Moneda Extranjero, (Contract for a Line of Credit in Foreign
                        Currency) dated June 11, 1998, between Banco de Credito del Peru and Doe Run Peru S.R. Ltda. (with
                        English translation).*
     10.10   --         Contrato de Afectacion en Garantia de Pagos y/o Cobranzas y de Cuentas Cobranza (Collection Account
                        Agreement) dated June 11, 1998, between Banco de Credito del Peru and Doe Run Peru Ltda. (with
                        English translation.)*
     10.11   --         Contrato de Prenda de Minerales (Ore Collateral Agreement) dated June 11, 1998, between Banco de
                        Credito del Peru and Doe Run Peru Ltda. (with English translation.)
        12   --         Statement regarding computation of ratios.
      15.1   --         Letter from PricewaterhouseCoopers LLP regarding unaudited interim financial information.*
        21   --         List of Subsidiaries of Registrant.*
      23.1   --         Consent of Cadwalader, Wickersham & Taft (included in Exhibit 5.1).*
      23.2   --         Consent of KPMG Peat Marwick LLP.
      23.3   --         Consent of Medina, Zaldivar y Asociados S. Civ. R.L., a member firm of Andersen Worldwide SC.
      23.4   --         Consent of Pincock, Allen & Holt.
      23.5   --         Consent of PricewaterhouseCoopers LLP.
        24   --         Power of Attorney (included on the signature page).*
        25   --         Statement of Eligibility and Qualification on Form T-1 of State Street Bank and Trust Company.*
</TABLE>
    
 
- ------------------------
 
*   Previously filed.

<PAGE>

                                                           Exhibit 12


                       RATIO OF EARNINGS TO FIXED CHARGES
                             (Dollars in Thousands)

<TABLE>
<CAPTION>
                                                  The Doe Run Resources Corporation
                                   ---------------------------------------------------------------
                                  Seven Months
                                     Ended        Year Ended October 31,         Six Months Ended
                                   October 31,   --------------------------         April 30,
                                      1994      1995       1996       1997       1997       1998
                                    -------    -------    -------    -------    -------    -------
<S>                                   <C>        <C>       <C>         <C>        <C>        <C>  
Earnings
- --------
Income before taxes                   1,018      7,575     18,916      3,978      5,375     16,759
Fixed charges                         8,088     13,551     14,624     15,771      8,618     12,484
Less: capitalized interest              (4)        (8)      (253)      (461)      (208)      (110)
                                    -------    -------    -------    -------    -------    -------
  Earnings                            9,102     21,118     33,287     19,288     13,785     29,133
Fixed Charges
  -------------
Interest Expense, net of 
  interest income                     8,363     14,221     14,235     13,719      7,566     12,146
Plus:
  Capitalized interest                    4          8        253        461        208        110
  Rental/lease interest                 181        462      1,034      1,848        976      1,072
Less:
  Amortization of financing costs      (460)    (1,140)      (898)      (257)      (132)      (844)
                                    -------    -------    -------    -------    -------    -------

  Fixed charges                       8,088     13,551     14,624     15,771      8,618     12,484
Ratio of earnings to fixed charges     1.13 x     1.56 x     2.28 x     1.22 x     1.60 x     2.33 x
                                    =======    =======    =======    =======    =======    =======  
</TABLE>


<PAGE>
                                                                    EXHIBIT 23.2
 
                         INDEPENDENT AUDITORS' CONSENT
 
   
The Board of Directors
The Doe Run Resources Corporation
and Subsidiaries:
    
 
We consent to the use of our report, which was based on our audits and the
audits of other auditors, dated December 19, 1997, except for note 15 as to
which the date is March 12, 1998, included herein and to the reference to our
firm under the heading "Experts" in the prospectus.
 
                                          KPMG Peat Marwick LLP
 
   
St. Louis, Missouri
August 12, 1998
    

<PAGE>

                                                                    Exhibit 23.3



                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

August 12, 1998

Dear Sirs:

As independent public accountants, we hereby consent to the use of our 
auditors' report dated December 5, 1997, on the financial statements of La 
Oroya Division of Empresa Minera del Centro del Peru S.A. as of October 23, 
1997 and December 31, 1996 and 1995 and for the period from January 1 to 
October 23, 1997 and the three-year period ended December 31, 1996; and our 
auditors' report dated December 5, 1997 on the financial statements of Doe 
Run Cayman Ltd. and Doe Run Peru S.R. Ltda as of October 31, 1997 and the 
period from October 23, 1997 to October 31, 1997 (included in the audited 
financial statements of The Doe Run Resources Corporation as of October 31, 
1997 and for the year then ended) which were prepared in accordance with U.S. 
generally accepted accounting principles, and to all references to our firm, 
in connection with the Registration Statement on Form S-4 to be filed by The 
Doe Run Resources Corporation.

MEDINA, ZALDIVAR Y ASOCIADOS, a Member Firm
  of Andersen Worldwide S.C.

/s/ Marco Antonio Zaldivar
          Partner

<PAGE>
                                                                    EXHIBIT 23.4
 
                   CONSENT OF INDEPENDENT MINING CONSULTANTS
 
   
                                              August 12, 1998
    
 
Mr. Marvin Kaiser
Chief Financial Officer
The Doe Run Resources Corporation
1801 Park 270 Drive
Suite 300
St. Louis, Missouri 63146
Dear Sirs:
 
    Pincock, Allen & Holt, a mining consulting firm based in Lakewood, Colorado,
hereby consents to the incorporation by reference the reserve statement entitled
"The Doe Run Resources Corporation--Reserve Audit--Mineable Reserves as of March
31, 1998" and all references to our firm included in or made part of The Doe Run
Resources Corporation's Registration Statement on Form S-4.
 
   
                                          Sincerely,
                                          PINCOCK, ALLEN & HOLT
                                          /s/ John W. Rozelle
                                          John W. Rozelle, P.G.
                                          Principal Geologist
    

<PAGE>
                                                                    EXHIBIT 23.5
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
   
    We consent to the inclusion in this registration statement on Amendment No.
2 to Form S-4 (File No. 333-52285) of our report dated July 28, 1998, on our
audits of the financial statements of the Missouri Lead Division. We also
consent to the reference to our firm under the caption "Expert".
    
 
                                          PricewaterhouseCoopers LLP
 
   
New York, New York
August 12, 1998
    


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