ASARCO INC
SC 14D1/A, 1999-10-18
PRIMARY SMELTING & REFINING OF NONFERROUS METALS
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                            ------------------------

                                 SCHEDULE 14D-1

                               (AMENDMENT NO. 2)

                             TENDER OFFER STATEMENT

      PURSUANT TO SECTION 14(D) (1) OF THE SECURITIES EXCHANGE ACT OF 1934

                                      AND
                               AMENDMENT NO. 6 TO
                                  SCHEDULE 13D
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                            ------------------------

                              ASARCO INCORPORATED

                           (Name of Subject Company)

                               ASMEX CORPORATION
                                      AND
                           GRUPO MEXICO, S.A. DE C.V.
                                   (Bidders)

                            ------------------------

                           COMMON STOCK, NO PAR VALUE
                        (INCLUDING THE ASSOCIATED JUNIOR
                 PARTICIPATING PREFERRED STOCK PURCHASE RIGHTS)
                         (Title of Class of Securities)

                            ------------------------

                                    04341310
                     (CUSIP Number of Class of Securities)

                            ------------------------

                            Daniel Tellechea Salido
                Managing Director for Administration and Finance
                           Grupo Mexico, S.A. de C.V.
                              Baja California 200
                                Colonia Roma Sur
                           06760 Mexico City, Mexico

                          Telephone: 011-525-574-2067

          (Name, Address and Telephone Number of Person Authorized To
            Receive Notices and Communications on Behalf of Bidders)

                                    COPY TO:

                            Lori Anne Czepiel, Esq.
                                Brown & Wood LLP
                             One World Trade Center
                            New York, New York 10048
                           Telephone: (212) 839-5300
                           Facsimile: (212) 839-5599

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
    This amendment constitutes Amendment No. 2 to the Tender Offer Statement on
Schedule 14D-1 as the same may have been amended from time to time (as amended
hereby, the "Statement") and the Amendment No. 6 to the Schedule 13D and relates
to the offer by Grupo Mexico, S.A. de C.V., a Mexican corporation ("Parent")
through its wholly owned subsidiary, ASMEX Corporation, a Delaware corporation
("Purchaser"), to purchase all of the outstanding shares of common stock,
without par value (together with the associated junior participating preferred
stock purchase rights, the "Common Stock"), of ASARCO Incorporated, a New Jersey
corporation ("ASARCO") at a purchase price of $29.50 per share of Common Stock,
net to the seller in cash, without interest thereon, upon the terms and subject
to the conditions set forth in the Offer to Purchase dated September 27, 1999
(as amended, the "Offer to Purchase"), a copy of which is attached to this
Statement as Exhibit (a)(1), as amended and supplemented by the Supplement dated
October 8, 1999 (the "Supplement"), a copy of which is attached to this
Statement as Exhibit (a)(10) (the Statement, along with the Offer to Purchase
and the Supplement, as each have been amended or supplemented from time to time,
constitute the "Offer"). Capitalized terms not defined herein have the meanings
ascribed in the Offer to Purchase and the Supplement. The item numbers and
responses thereto below are in accordance with the requirements of
Schedule 14D-1.

ITEM 3. PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS WITH THE SUBJECT COMPANY.

    Item 3 is hereby amended by the following:

    The discussion set forth in the "INTRODUCTION" and "Section 11--Background
of the Offer; Contacts with ASARCO" of the Offer to Purchase is hereby amended
as follows:

    On October 8, 1999, Parent filed Amendment No. 1 to its Schedule 14D-1,
reflecting the fact that Parent had revised the Offer to, among other things,
increase the Offer Price from $26.00 per share of Common Stock to $29.50 per
share of Common Stock. Also on October 8, 1999, ASARCO filed an amendment to the
ASARCO Schedule 14D-9 that contained and discussed the PD Merger Agreement and
stated that ASARCO was considering Parent's revised bid.

    Later on October 8, 1999, Phelps Dodge issued a press release stating that
Phelps Dodge would not raise its offer for ASARCO.

    ASARCO issued a press release on October 8, 1999, announcing that the ASARCO
Board met to consider Parent's revised Offer. The press release stated that at
the meeting, the ASARCO Board considered, together with advice from its
financial and legal advisors, the terms of Parent's revised Offer, ASARCO's
rights and obligations under the PD Merger Agreement and its fiduciary duties to
shareholders of ASARCO under applicable law. The press release stated that, in
accordance therewith, the ASARCO Board determined in good faith, after
consultation with its legal and financial advisors, that it was necessary in
order to comply with its fiduciary duties under applicable law to recommend to
the ASARCO shareholders that they not tender their shares pursuant to the Phelps
Dodge Offer, and if necessary ASARCO would furnish information to Parent
pursuant to a customary confidentiality agreement and participate in discussions
or negotiations regarding the Offer, as revised.

    Later that day, ASARCO filed another amendment to the ASARCO 14D-9
reflecting this change. According to the amendment, the ASARCO Board notified
Phelps Dodge in accordance with the terms of the PD Merger Agreement of its
intention to take these actions.

    On the evening of Friday, October 8, 1999, Parent's legal advisors delivered
to ASARCO Parent's proposed revisions to the agreement relating to the Proposed
Merger (the "Proposed Merger Agreement"), which revisions set forth the basis
upon which Parent was prepared to consummate the Proposed Merger.

    Over the course of the next few days, Parent's and ASARCO's respective
financial and legal advisors conducted negotiations relating to the Proposed
Merger Agreement.

                                       2
<PAGE>
    ASARCO issued a press release on October 11, 1999 stating that on
October 12, 1999, the ASARCO Board would meet to discuss Parent's latest offer.

    On October 13, 1999, Phelps Dodge issued a press release reiterating its
previous decision not to raise its offer for ASARCO.

    On Thursday, October 14, 1999, Parent notified ASARCO that it would be
willing to increase its tender offer price to $29.75 per share of Common Stock
in cash subject to Parent entering into the Proposed Merger Agreement with
ASARCO prior to 5:00 P.M. New York City time on October 23, 1999. In connection
therewith, Parent submitted a revised bid package to ASARCO detailing its
willingness to increase the Offer Price to $29.75 per share of Common Stock in
the event ASARCO were to agree to increase the termination fee indicated in the
Proposed Merger Agreement to $40 million and to deliver notice to Phelps Dodge
that it is prepared to execute the Proposed Merger Agreement with Parent. The
letter stated that the revised Offer would remain outstanding until 5:00 P.M. on
October 23, 1999. The bid package included Parent's proposed revisions to the
Proposed Merger Agreement, which incorporated comments made during negotiations
that transpired earlier in the week between ASARCO and Parent and the legal and
financial advisors of ASARCO and Parent.

    On October 15, 1999, ASARCO issued a press release stating that earlier that
day, the ASARCO Board met to consider Parent's revised proposal. According to
the press release, at the meeting, the ASARCO Board authorized ASARCO's
management to provide notice to Phelps Dodge that ASARCO is prepared to accept
the revised Offer and that ASARCO intended to terminate the PD Merger Agreement
on Saturday, October 23, 1999 at or after 9:00 A.M. Later that day, ASARCO filed
an amendment to the Schedule 14D-9 relating to the Offer reflecting these
occurrences.

ITEM 4. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

    Item 4 is hereby amended by the following:

    The discussion set forth in "Section 10--Source and Amount of Funds" of the
Offer to Purchase is hereby amended as follows:

    On October 15, 1999, the commitment letter, dated as of September 24, 1999
(the "Commitment Letter") and as amended and revised on October 5, 1999 (the
"First Amended and Restated Commitment Letter") and October 7, 1999 (the "Second
Amended and Restated Commitment Letter"), by and among Parent, The Chase
Manhattan Bank and Chase Securities Inc. (collectively, "Chase") was further
amended and restated (the "Third Amended and Restated Commitment Letter"), a
copy of which is which is filed as Exhibit (b)(4) and incorporated herein by
reference, to modify certain conditions to the obligations of Chase under the
Credit Facilities to, among other things, provide a revised condition with
respect to market disruptions that is more narrow than the prior such condition
until December 18, 1999, or that date that is the same number of days after
November 30, 1999 as the date of execution and delivery of a definitive merger
agreement is after October 5, 1999, whichever is earlier, and that reverts to
its prior form thereafter. Such amendments to the commitment letter were subject
to a satisfactory merger agreement being entered into with ASARCO not later than
5:00 P.M. New York City time on October 23, 1999.

    The foregoing description of the Credit Facilities is qualified in its
entirety by reference to the full text of the Third Amended and Restated
Commitment Letter, a copy of which is filed as Exhibit (b)(4) and incorporated
herein by reference.

ITEM 5. PURPOSE OF THE TENDER OFFER AND PLANS OR PROPOSALS OF THE BIDDER.

    Item 5 is hereby amended by the information set forth in Item 3 above.

ITEM 6. INTEREST IN SECURITIES OF THE SUBJECT COMPANY.

    Item 6 is hereby amended by the information set forth in Item 3 above.

                                       3
<PAGE>
ITEM 7. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
  THE SUBJECT COMPANY'S SECURITIES.

    Item 7 is hereby amended by the information set forth in Item 3 above.

ITEM 9. FINANCIAL STATEMENTS OF CERTAIN BIDDERS.

    Item 9 is hereby amended by the following:

    The information set forth in "Section 9--Certain Information Concerning
Purchaser, Parent and Certain Affiliates" under the heading "Differences Between
Mexican GAAP and U.S. GAAP" is amended by the following:

    A. The second paragraph under the subheading "Cash flow information" is
amended and restated as follows:

    Statement of Financial Accounting Standard No. 95, "Statement of Cash Flows"
(SFAS No. 95), requires that the effects of inflation on cash flows be shown
separately.

    B. The second paragraph under the subheading "Cost of pension plans and
other employee benefits" is amended and restated as follows:

    Parent provides health care benefits for the retired and active employees of
Mexicana de Cananea, S.A. de C.V. ("Mexcananea") as well as their family members
through a subsidiary of Mexcananea (Hospital del Ronquillo, S. de R.L. de C.V.).
During 1995 Parent adopted SFAS 106, "Employers' Accounting for Postretirement
Benefits Other than Pensions". Due to the fact that Parent in previous years had
few employees that were eligible for this benefit, the liability based on the
actuarial calculation was considered immaterial and therefore the related effect
was not included in the U.S. GAAP reconciliation. In 1998 Parent terminated 600
union and 400 non-union employees, thus accelerating the related postretirement
benefits for such employees and resulting in a charge of Ps. 34,880 which was
included in the U.S. GAAP reconciliation.

    C. The fourth paragraph under the subheading "Property and equipment" is
amended and restated as follows:

    In accordance with the fifth amendment to Bulletin B-10, the value of
machinery and equipment of foreign origin may be restated based on the
devaluation and inflation of the country of origin. Parent does not utilize this
option to restate the value of its property and equipment.

    D. The second paragraph under the subheading "Financial Statement
translation for foreign subsidiaries" is amended and restated as follows:

    Under U.S. GAAP, the translation of financial statements of subsidiaries
with operations in hyper inflationary economies should be remeasured into the
reporting currency. The process requires monetary assets and liabilities to be
remeasured at the year-end exchange rate, while non-monetary assets and
liabilities and income and expense accounts are remeasured at the historical
exchange rate. Resulting exchange differences are included in income.

    E. The paragraph under the subheading "Available for sale security" is
amended and restated as follows:

    Available for sales security. Under Mexican GAAP, the investment in ASARCO
is included in cash and marketable securities in the amounts of Ps. 614,802 and
Ps. 665,672 as of December 31, 1998 and 1997, respectively. Changes in the
market value of the investment were recorded as interest income (loss) in the
statement of income and amounted to 271,650 and (5,565) for the years ended
December 31, 1998 and 1997, respectively. Under U.S. GAAP and in accordance with
Statement of Financial Accounting Standard No. 115, this investment should be
classified as an "available for sale security" and reported at fair value, with
unrealized gains and losses excluded from earnings and reported in other
comprehensive income.

                                       4
<PAGE>
F. RECONCILIATION OF MEXICAN GAAP TO U.S. GAAP

    Net income and stockholders' equity, adjusted to take into account the
significant differences between Mexican GAAP and U.S. GAAP, except for the
comprehensive effects of price-level changes, are as follows:

<TABLE>
<CAPTION>
                                                        1998            1997             1996
                                                    -------------   -------------   --------------
<S>                                                 <C>             <C>             <C>
NET INCOME:
Consolidated net income under Mexican GAAP........   Ps.  806,638   Ps. 2,921,045    Ps. 4,004,570
  U.S. GAAP adjustments:
  Deferred income tax asset (liability)...........       (335,854)       (378,325)      (1,567,349)
  Deferred employee profit sharing liability......       (450,515)       (404,732)        (219,286)
  Amortization of capitalized exchange loss and
    gain on monetary position.....................          4,769           4,769            4,769
  Capitalized interest............................        206,170         269,199               --
  Amortization of negative goodwill...............        583,029         689,983          598,319
  Pension plan cost...............................          2,037             445              772
  Gain (loss) in permanent investment.............        271,650          (5,565)              --
  Postretirement plan costs.......................        (34,880)             --               --
  Adoption of SOP 98-5............................       (222,321)       (110,888)              --
  Gain on extinguishment of debt..................         82,787              --               --
  Effects of inflation accounting on U.S. GAAP
    adjustments and monetary gain on labor
    liabilities...................................      1,250,231       1,119,208        1,900,509
                                                    -------------   -------------   --------------
                                                        1,357,103       1,184,094          717,734
                                                    -------------   -------------   --------------
Consolidated net income under U.S. GAAP...........  Ps. 2,163,741   Ps. 4,105,139    Ps. 4,722,304
                                                    =============   =============   ==============
</TABLE>

<TABLE>
<CAPTION>
                                                                   1998              1997
                                                              ---------------   ---------------
<S>                                                           <C>               <C>
STOCKHOLDERS' EQUITY:
  Stockholders' equity under Mexican GAAP...................   Ps. 29,635,784    Ps. 29,642,490
  U.S. GAAP adjustments:
  Deferred income taxes.....................................       (4,967,527)       (5,523,988)
  Deferred employee profit sharing..........................       (2,151,540)       (2,058,836)
  Capitalized exchange loss and gain on monetary position...         (185,958)         (190,727)
  Capitalized interest......................................          475,369           269,199
  Accumulated pension plan cost.............................           (1,066)            1,034
  Postretirement plan costs.................................          (34,880)               --
  Negative goodwill (previously amortized for Mexican GAAP
    purposes)...............................................       (3,513,541)       (4,096,570)
  Adoption of SOP 98-5......................................         (333,209)         (110,888)
  Gain on extinguishment of debt............................           82,787                --
  Investment in common stock of a parent company............       (1,303,637)       (1,947,718)
                                                              ---------------   ---------------
                                                                  (11,933,202)      (13,658,494)
                                                              ---------------   ---------------
Stockholders' equity under U.S. GAAP........................   Ps. 17,702,582    Ps. 15,983,996
                                                              ===============   ===============
</TABLE>

ITEM 10. ADDITIONAL INFORMATION.

    Item 10 is hereby amended by the information set forth in Item 3 and by the
following:

    CONDITIONS OF THE OFFER.  The discussion set forth in the Introduction to
the Offer to Purchase and Section 14 of the Offer to Purchase is amended and
supplemented as follows:

                                       5
<PAGE>
    A. The second paragraph on page 13 in the Offer to Purchase under
"Section 1--Terms of the Offer; Expiration Date" is restated as follows:

    The Offer is conditioned upon, among other things, satisfaction of the
Minimum Condition, the Rights Condition and the Merger Agreement Condition. If
prior to the Expiration Date any or all of such conditions, or if any or all of
the other events set forth in Section 14 are not satisfied, other than events
relating to regulatory approvals (which must be satisfied prior to acceptance
for payment of shares of Common Stock), Purchaser reserves the right (but shall
not be obligated) to (i) decline to purchase any of the shares of Common Stock
tendered in the Offer and to terminate the Offer and return all tendered shares
of Common Stock to the tendering shareholders, (ii) waive or reduce the Minimum
Condition or waive or amend any or all other conditions to the Offer to the
extent permitted by applicable law, and, subject to complying with applicable
rules and regulations of the SEC, purchase all shares of Common Stock validly
tendered, or (iii) extend the Offer and, subject to the right of shareholders to
withdraw shares of Common Stock until the Expiration Date, retain the shares of
Common Stock that have been tendered during the period or periods for which the
Offer is extended.

    B. The first paragraph on page 50 of the Offer to Purchase under
"Section 14--Conditions of the Offer" is restated as follows:

    Notwithstanding any other provisions of the Offer, and in addition to (and
not in limitation of) Purchaser's rights to extend and amend the Offer at any
time in its sole discretion, Purchaser shall not be required to accept for
payment or, subject to any applicable rules and regulations of the SEC,
including Rule 14e-1(c) under the Exchange Act (relating to Purchaser's
obligation to pay for or return tendered shares of Common Stock promptly after
termination or withdrawal of the Offer), pay for, and may delay the acceptance
for payment of or, subject to the restriction referred to above, the payment
for, any tendered shares of Common Stock, and may terminate the Offer as to any
shares of Common Stock not then paid for, if, in the sole judgment of Purchaser
at or prior to (i) the acceptance for payment of shares of Common Stock, any
required regulatory approvals have not been obtained or (ii) the Expiration Date
(x) any one or more of the Minimum Condition, the Rights Condition or the Merger
Agreement Condition shall not have been satisfied or (y) any of the following
events shall occur or shall be deemed by Purchaser to have occurred:

    C. The Merger Agreement Condition is amended and restated to read as
follows:

    "THE MERGER AGREEMENT CONDITION. CONSUMMATION OF THE OFFER IS CONDITIONED
UPON PURCHASER BEING SATISFIED, IN ITS SOLE DISCRETION, THAT THE PD MERGER
AGREEMENT HAS BEEN TERMINATED AND ASARCO HAVING ENTERED INTO A DEFINITIVE MERGER
AGREEMENT WITH PARENT AND PURCHASER THAT WOULD PROVIDE FOR THE ACQUISITION OF
ASARCO BY PARENT OR PURCHASER (THE "MERGER AGREEMENT CONDITION").

    In order for the Merger Agreement Condition to be satisfied, the PD Merger
Agreement must be terminated. Depending on ASARCO's willingness to enter into
negotiations with Parent and Purchaser and the then pending status of any such
negotiations, Purchaser may extend the Offer from time to time until the Merger
Agreement Condition is satisfied.

    In the event the Merger Agreement Condition is satisfied prior to 5:00 P.M.
New York City time on October 23, 1999, Purchaser and Parent, in accordance with
the terms of the Third Amended and Restated Commitment Letter, will be in the
position to substantially limit its conditions to the following:

    "Notwithstanding any other provisions of the Offer, and in addition to (and
not in limitation of) Purchaser's rights to extend and amend the Offer at any
time in its sole discretion (subject to the provisions of the Proposed Merger
Agreement), Purchaser shall not be required to accept for payment or, subject to
any applicable rules and regulations of the SEC, including Rule 14e-1(c) under
the Exchange Act (relating to Purchaser's obligation to pay for or return
tendered Common Stock promptly after termination or withdrawal of the Offer),
pay for, and may delay the acceptance for payment of or, subject

                                       6
<PAGE>
to the restriction referred to above, the payment for, any tendered shares of
Common Stock, and may terminate or amend the Offer (but only subject to and in
accordance with the Proposed Merger Agreement) if (i) the HSR Act Condition (as
defined in the Proposed Merger Agreement) has not been satisfied, (ii) the
Minimum Condition has not been satisfied or (iii) at any time on or after
October 23, 1999 and before the Expiration Date for payment pursuant to the
Offer, any of the following events shall occur:

    (a) there shall have been any statute, rule, regulation, judgment, order or
injunction promulgated, entered, enforced, enacted, issued or rendered
applicable to the Offer or the Proposed Merger by any domestic or foreign,
federal or state governmental regulatory or administrative agency or authority
or court or legislative body or commission which (i) prohibits, or imposes any
material limitations on, Parent's or Purchaser's ownership or operation of all
or a material portion of ASARCO's businesses or assets, (ii) prohibits, or makes
illegal the acceptance for payment, payment for or purchase of Common Stock or
the consummation of the Offer or the Proposed Merger, (iii) results in a
material delay in or restricts the ability of Purchaser, or renders Purchaser
unable, to accept for payment, pay for or purchase some or all of the tendered
shares of Common Stock, or (iv) imposes material limitations on the ability of
Purchaser or Parent effectively to exercise full rights of ownership of the
Common Stock, including, without limitation, the right to vote the Common Stock
purchased by it on all matters properly presented to ASARCO's shareholders,
PROVIDED that Parent and Purchaser shall have used all reasonable efforts to
cause any such judgment, order or injunction to be vacated or lifted;

    (b) the representations and warranties of ASARCO set forth in the Proposed
Merger Agreement shall not be true and correct as of the date of consummation of
the Offer as though made on or as of such date except, in each case, (i) for
changes specifically permitted by the Proposed Merger Agreement and
(ii) (A) those representations and warranties that address matters only as of a
particular date which are true and correct as of such date or (B) where the
failure of such representations and warranties to be true and correct (without
giving effect to any qualifications as to "materiality" or "Material Adverse
Effect" set forth therein) would not reasonably be expected to have,
individually or in the aggregate, a Material Adverse Effect on ASARCO, or ASARCO
shall have materially breached or failed in any material respect to perform or
comply with any material obligation, agreement or covenant required by the
Agreement to be performed or complied with by it;

    (c) the Proposed Merger Agreement shall have been terminated in accordance
with its terms prior to the Expiration Date;

    (d) ASARCO shall have entered into a definitive agreement or agreement in
principle with any person with respect to an ASARCO Takeover Proposal or similar
business combination with ASARCO;

    (e) (i) The Chase Manhattan Bank and Chase Securities Inc. shall have
terminated the commitment letter as a result of there having occurred after the
date the Proposed Merger Agreement is executed to that date that is the same
number of days after November 30, 1999 as the date of execution and delivery of
the Proposed Merger Agreement is after October 5 (the "Agreed Date"), a general
banking moratorium established by Federal or state authorities, a generally
recognized capital markets crisis, as evidenced by a cumulative 20% decline in
the Dow Industrial Average over a period of five (5) consecutive trading days,
or a virtual cessation in bank and other private debt financings or the
introduction of additional material government restrictions imposed by lending
institutions which materially affect the type of transactions contemplated by
the Proposed Merger Agreement, and (ii) The Chase Manhattan Bank and Chase
Securities Inc. shall have terminated the commitment letter as a result of there
having occurred after the Agreed Date a material disruption of or material
adverse change in U.S. or developed country financial, banking or capital market
conditions that is reasonably likely to materially impair the syndication of the
Credit Facilities; or

    (f) the ASARCO Board of Directors shall have withdrawn, or amended, modified
or changed in a manner adverse to Parent or the Purchaser (including by
amendment of the Schedule 14D-9), its recommendation of the Offer, the Proposed
Merger Agreement or the Proposed Merger, or recommended

                                       7
<PAGE>
another proposal or offer from any person other than Parent or Purchaser, or
shall have resolved to do any of the foregoing; which in the reasonable judgment
of Parent or Purchaser, in any such case, and regardless of the circumstances
giving rise to such condition, makes it inadvisable to proceed with the Offer
and/or with such acceptance for payment or payments;

which in the reasonable judgment of Parent or the Purchaser, in any such case,
and regardless of the circumstances giving rise to such condition, makes it
inadvisable to proceed with the Offer and/or with such acceptance for payment or
payments.

    The foregoing conditions will be for the sole benefit of Purchaser and
Parent and may be waived by Parent or Purchaser, in whole or in part at any time
and from time to time in the sole discretion of Parent or Purchaser.

ITEM 11. MATERIAL TO BE FILED AS EXHIBITS

<TABLE>
<S>             <C>
(a)(1)          Offer to Purchase dated September 27, 1999.*

(a)(2)          Form of Letter of Transmittal.*

(a)(3)          Form of Notice of Guaranteed Delivery.*

(a)(4)          Form of Letter to Brokers, Dealers, Commercial Banks, Trust
                Companies and Other Nominees.*

(a)(5)          Form of Letter to Clients for use by Brokers, Dealers,
                Commercial Banks, Trust Companies and Other Nominees.*

(a)(6)          Form of Guidelines for Certification of Taxpayer
                Identification Number on Substitute Form W-9.*

(a)(7)          Form of Summary Advertisement dated September 27, 1999.*

(a)(8)          Press release of Parent dated September 24, 1999.*

(a)(9)          Press release of Parent dated September 27, 1999.*

(a)(10)         Supplement to the Offer to Purchase dated October 8, 1999.*

(a)(11)         Press release of Parent dated October 7, 1999.*

(b)(1)          Commitment Letter from The Chase Manhattan Bank and Chase
                Securities Inc. dated September 24, 1999.*

(b)(2)          First Amended and Restated Commitment Letter from The Chase
                Manhattan Bank and Chase Securities Inc. dated October 5,
                1999.*

(b)(3)          Second Amended and Restated Commitment Letter from The Chase
                Manhattan Bank and Chase Securities Inc. dated October 15,
                1999.*

(b)(4)          Third Amended and Restated Commitment Letter from The Chase
                Manhattan Bank and Chase Securities Inc. dated October 15,
                1999.

(c)             Not applicable.

(d)             Not applicable.

(e)             Not applicable.

(f)             None.

(g)(1)          1997 Annual Report of Parent.*

(g)(2)          1998 Annual Report of Parent.*
</TABLE>

                                       8
<PAGE>
                                   SIGNATURE

    After due inquiry and to the best of its knowledge and belief, the
undersigned certifies that the information set forth in this statement is true,
complete and correct.

Dated: October 18, 1999

<TABLE>
<S>                                               <C>  <C>
                                                  GRUPO MEXICO, S.A. DE C.V.

                                                  By:  /s/ DANIEL TELLECHEA SALIDO
                                                       ----------------------------------------------
                                                       Name: Daniel Tellechea Salido
                                                       Title:  Managing Director for Administration
                                                               and Finance

                                                  GRUPO MEXICO, S.A. DE C.V.

                                                  By:  /s/ HECTOR CALVA RUIZ
                                                       ----------------------------------------------
                                                       Name: Hector Calva Ruiz
                                                       Title:  Managing Director for Exploration
                                                               and Projects

                                                  ASMEX CORPORATION

                                                  By:  /s/ DANIEL TELLECHEA SALIDO
                                                       ----------------------------------------------
                                                       Name: Daniel Tellechea Salido
                                                       Title:  Vice President and Treasurer
</TABLE>

                                       9
<PAGE>
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT NO.
- -----------
<S>          <C>
(a)(1)       Offer to Purchase dated September 27, 1999.*

(a)(2)       Form of Letter of Transmittal.*

(a)(3)       Form of Notice of Guaranteed Delivery.*

(a)(4)       Form of Letter to Brokers, Dealers, Commercial Banks, Trust
             Companies and Other Nominees.*

(a)(5)       Form of Letter to Clients for use by Brokers, Dealers,
             Commercial Banks, Trust Companies and Other Nominees.*

(a)(6)       Form of Guidelines for Certification of Taxpayer
             Identification Number on Substitute Form W-9.*

(a)(7)       Form of Summary Advertisement dated September 27, 1999.*

(a)(8)       Press release of Parent dated September 24, 1999.*

(a)(9)       Press release of Parent dated September 27, 1999.*

(a)(10)      Supplement to the Offer to Purchase dated October 8, 1999.*

(a)(11)      Press release of Parent dated October 7, 1999.*

(b)(1)       Commitment Letter from The Chase Manhattan Bank and Chase
             Securities Inc. dated September 24, 1999.*

(b)(2)       First Amended and Restated Commitment Letter from The Chase
             Manhattan Bank and Chase Securities Inc. dated October 5,
             1999.*

(b)(3)       Second Amended and Restated Commitment Letter from The Chase
             Manhattan Bank and Chase Securities Inc. dated October 7,
             1999.*

(b)(4)       Third Amended and Restated Commitment Letter from The Chase
             Manhattan Bank and Chase Securities Inc. dated October 15,
             1999.

(c)          Not applicable.

(d)          Not applicable.

(e)          Not applicable.

(f)          None.

(g)(1)       1997 Annual Report of Parent.*

(g)(2)       1998 Annual Report of Parent.*
</TABLE>

- ------------------------

*   Previously filed.

<PAGE>



[GRAPHIC OMITTED]



THE CHASE MANHATTAN BANK                                 CHASE SECURITIES INC.
270 Park Avenue                                               270 Park Avenue
New York, New York  10017                           New York, New York  10017



                                October 15, 1999


                                ASMEX Corporation
                        Senior Secured Credit Facilities
                  Third Amended and Restated Commitment Letter

Grupo Mexico, S.A. de C.V.
Baja California 200
Colonia Roma Sur
Mexico, D.F.  Mexico
06760

Attention:  Daniel Tellechea

Ladies and Gentlemen:

         This Third Amended and Restated Commitment Letter hereby, subject to
the terms and conditions set forth herein, amends and restates the Second
Amended and Restated Commitment Letter dated October 7, 1999 (the "SECOND
AMENDED AND RESTATED COMMITMENT"), among Grupo Mexico, Chase and CSI (each as
defined below). You have advised The Chase Manhattan Bank ("CHASE") and Chase
Securities Inc. ("CSI") that ASMEX Corporation, a Delaware corporation (the
"BORROWER"), a wholly-owned subsidiary of Grupo Mexico, S.A. de C.V., a Mexican
corporation ("GRUPO MEXICO"), intends to make a cash tender offer (the "TENDER
OFFER") for common stock of Asarco Incorporated, a New Jersey corporation
("ASARCO"), representing at least 80% of the ordinary voting power of all of the
shares of capital stock of Asarco on a fully diluted basis (including stock of
Asarco owned by Grupo Mexico and

- --------------------------------------------------------------------------------
[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       2


subsidiaries prior to the Tender Offer), to be followed by the merger of the
Borrower into Asarco, with Asarco thereby becoming a wholly-owned subsidiary of
Grupo Mexico.

         We understand that to provide funds for the Tender Offer and to pay
related fees and expenses, Grupo Mexico requires that senior secured financing
be made available to the Borrower in the amount of up to $823 million (the "A
TENDER FACILITY"). We further understand that, following the successful
completion of the Tender Offer, the Borrower is to be merged into Asarco with
Asarco thereby becoming a wholly-owned subsidiary of Grupo Mexico (the "MERGER"
and, together with the Tender Offer, the "TRANSACTIONS"), and that (whether or
not the Merger is immediately effected) Grupo Mexico will require senior
financing for Asarco (the "R/C FACILITIES") in an aggregate amount equal to $250
million in order to refinance certain indebtedness of Asarco and to provide
funds for ongoing general corporate purposes. The A Tender Facility and the R/C
Facilities are herein collectively referred to as the "FACILITIES".

         In that connection, you have requested that CSI agree to structure,
arrange and syndicate the Facilities, and that Chase commit to provide the
entire principal amount of the Facilities and to serve as administrative agent
for the Facilities.

         CSI is pleased to advise you that it is willing to act as exclusive
advisor, lead arranger and book manager for the Facilities.

         Furthermore, Chase is pleased to advise you of its commitment to
provide the entire amount of the Facilities upon the terms and subject to the
conditions set forth or referred to in this third amended and restated
commitment letter (the "THIRD AMENDED AND RESTATED COMMITMENT LETTER"), in the
Third Amended and Restated Summary of Terms and Conditions attached hereto as
Exhibit A (the "TERM SHEET") and in the Amended and Restated Fee Letter dated
October 15, 1999 (the "AMENDED AND RESTATED FEE LETTER"). We intend to syndicate
the Facilities to a group of financial institutions (together with Chase, the
"LENDERS") identified by us in consultation with you. Chase shall be relieved of
its obligation to provide the entire amount of the Facilities to the extent that
the offers of Lenders other than Chase to provide any portion of the Facilities
are accepted.

         CSI intends to commence syndication efforts promptly, and you agree
actively to assist CSI in its efforts to complete a syndication satisfactory to
it prior to the Tender Closing Date referred to in the Term Sheet. Such
assistance shall include (a) your using commercially reasonable efforts to
ensure that the syndication efforts benefit materially from your existing
lending relationships, (b) direct contact between senior management and advisors
of yourselves and the Borrower and the proposed Lenders, (c) assistance in the
preparation of a Confidential Information Memorandum and other marketing
materials to be used in connection with the syndication and (d) the hosting,
with CSI, of one or more meetings of prospective Lenders.

         It is agreed that Chase will act as the sole and exclusive
Administrative Agent for the Facilities and as the Collateral Agent in
connection with the Facilities, and that CSI will act as the sole and exclusive
advisor, arranger and book manager for the Facilities, and each will, in such
capacities, perform the duties and exercise the authority customarily performed
and exercised by it in such roles. You agree that no other agents, co-agents,
arrangers or book


- --------------------------------------------------------------------------------
[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       3


managers will be appointed, no other titles will be awarded and no compensation
(other than that expressly contemplated by the Term Sheet and the Amended and
Restated Fee Letter referred to below) will be paid in connection with the
Facilities unless you and we shall so agree.

         CSI will (in consultation with you) manage all aspects of the
syndication, including decisions as to the selection of institutions to be
approached and when they will be approached, when their commitments will be
accepted, which institutions will participate, the allocations of the
commitments among the Lenders and the amount and distribution of fees among the
Lenders. To assist CSI in its syndication efforts, you agree promptly to prepare
and provide to CSI and Chase all information with respect to Grupo Mexico, Grupo
Minero Mexico, S.A. de C.V., a Mexican corporation ("GMM") , the Borrower and
their respective subsidiaries, the Transactions and the other matters
contemplated hereby, including all financial information and projections (the
"PROJECTIONS"), as we may reasonably request in connection with the arrangement
and syndication of the Facilities. You hereby represent and covenant that (a)
all information other than the Projections (the "INFORMATION") that has been or
will be made available to Chase or CSI by you or any of your representatives is
or will be, when furnished, complete and correct in all material respects and
does not or will not, when furnished, contain any untrue statement of a material
fact or omit to state a material fact necessary in order to make the statements
contained therein not materially misleading in light of the circumstances under
which such statements are made and (b) the Projections that have been or will be
made available to Chase or CSI by you or any of your representatives have been
or will be prepared in good faith based upon reasonable assumptions. You
understand that in arranging and syndicating the Facilities we may use and rely
on the Information and Projections without independent verification thereof.

         As consideration for Chase's commitment hereunder and CSI's agreement
to perform the services described herein, you agree to pay and to cause the
Borrower to pay to Chase the non-refundable fees set forth in Annex I to the
Term Sheet and in the Amended and Restated Fee Letter.

         Chase's commitment hereunder and CSI's agreement to perform the
services described herein are subject to

         (a) (i) there not occurring or becoming known to us any material
    adverse condition or material adverse change in or affecting the business,
    operations, property or financial condition of Grupo Mexico and its
    subsidiaries, GMM and its subsidiaries, or Asarco and its subsidiaries, in
    each case taken as a whole, which (in the case of Asarco and its
    subsidiaries) is not already disclosed and publicly available or otherwise
    known by any of our officers who is working with you on the Transactions;
    PROVIDED, HOWEVER, that any adverse effect that copper prices have had or
    may have on the business, operations, property or financial condition of
    Grupo Mexico and its subsidiaries, GMM and its subsidiaries, or Asarco and
    its subsidiaries, in each case taken as a whole, shall not be deemed to be
    such a material adverse condition or material adverse change for purposes of
    this clause (a)(i); and (ii) our not becoming aware after September 24,
    1999, of any information or other matter affecting Grupo Mexico and its
    subsidiaries, GMM


- --------------------------------------------------------------------------------
[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       4


    and its subsidiaries, Asarco and its subsidiaries, in each case taken as a
    whole, or the transactions contemplated hereby which is inconsistent in a
    material and adverse manner with any such information or other matter
    disclosed to us prior to September 24, 1999, and which (in the case of
    Asarco and its subsidiaries) is not already disclosed and publicly available
    or otherwise known by any of our officers who is working with you on the
    Transactions,

         (b) there shall not have been any statute, rule, regulation, judgment,
    order or injunction promulgated, entered, enforced, enacted, issued or
    applicable to the Tender Offer or the Merger by any domestic or foreign
    federal or state governmental regulatory or administrative agency or
    authority or court or legislative body or commission which (i) prohibits, or
    imposes any material limitations on, Grupo Mexico's or Asmex' ownership or
    operation of all or a material portion of Asarco's businesses or assets,
    (ii) prohibits, or makes illegal the acceptance for payment, payment for or
    purchase of Asarco common stock or the consummation of the Tender Offer or
    the Merger, (iii) results in a material delay in or restricts the ability of
    Grupo Mexico, or renders Grupo Mexico unable, to accept for payment, pay for
    or purchase some or all of the tendered shares of Asarco common stock, or
    (iv) imposes material limitations on the ability of Asmex or Grupo Mexico
    effectively to exercise full rights of ownership of the Asarco common stock,
    including, without limitation, the right to vote the Asarco common stock
    purchased by it on all matters properly presented to Asarco's shareholders,

         (c) there not having occurred (i) after the date hereof to the Agreed
    Date (as hereafter defined), a general banking moratorium established by
    Federal or state authorities, a generally recognized capital markets crisis,
    as evidenced by a cumulative 20% decline in the Dow Jones Industrial Average
    over a period of five (5) consecutive trading days, or a virtual cessation
    in bank and other private debt financings or the introduction of additional
    material government restrictions imposed upon lending institutions which
    materially affect the type of transactions contemplated thereby, and (ii)
    after the Agreed Date, a material disruption of or material adverse change
    in U.S. or developed country financial, banking or capital market conditions
    that, in our judgment, is reasonably likely to materially impair the
    syndication of the Facilities (it being agreed that, for purposes of this
    clause (c), the term "Agreed Date" shall mean the date, not later than
    December 18, 1999, that is the same number of days after November 30, 1999
    as the date of execution and delivery of a definitive Merger agreement is
    after October 5, 1999),

         (d) our satisfaction that prior to and during the syndication of the
    Facilities there shall be no competing offering, placement or arrangement of
    any debt securities or bank financing by or on behalf of Grupo Mexico or any
    affiliate thereof,

         (e) in the case of the A Tender Facility, our satisfaction with the
    conditions of the Tender Offer which will include, in any event (unless
    otherwise satisfied in connection with the definitive Merger agreement with
    Asarco), (i) invalidation, redemption or other inapplicability of the rights
    issued under Asarco's Shareholder Rights Agreement dated as of January 28,
    1998, as amended, (ii) invalidation or satisfaction of the requirements of


- --------------------------------------------------------------------------------
[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       5


    Article 7 of Asarco's Restated Certificate of Incorporation with respect to
    the Transactions such that following consummation of the Tender Offer the
    Merger may be consummated without the affirmative vote of the holders of any
    Asarco shares other than the Borrower, (iii) invalidity, inapplicability or
    satisfaction (if necessary) of Article 10 of Asarco's Restated Certificate
    of Incorporation with respect to the Transactions or the Facilities, (iv)
    satisfaction or inapplicability of the requirements of Section 14A:10A of
    the New Jersey Business Corporation Act with respect to the Merger such that
    following consummation of the Tender Offer the Merger may be consummated
    without the affirmative vote of the holders of any Asarco shares other than
    the Borrower and (v) obtaining all regulatory approvals and consents
    (including Hart-Scott-Rodino and other approvals or consents, if any)
    necessary to effect the Transactions,

         (f) in the case of the R/C Facilities, prior or concurrent disbursement
    of the A Tender Facility, successful consummation of the Tender Offer and
    our satisfaction with the terms and conditions of the definitive Merger
    agreement,

         (g) the negotiation, execution and delivery on or prior to the Tender
    Closing Date of definitive documentation with respect to the Facilities
    satisfactory to all parties, and

         (h) the other conditions set forth or referred to in the Term Sheet.

The terms and conditions of Chase's commitments hereunder and of the Facilities
are not limited to those set forth herein and in the Term Sheet and Amended and
Restated Fee Letter. Those matters that are not covered by the provisions hereof
and of the Term Sheet are subject to the approval and agreement of Chase, CSI
and Grupo Mexico. Notwithstanding the foregoing, the Term Sheet and Amended and
Restated Fee Letter are intended to reflect all material closing conditions,
representations and warranties, covenants and events of default, subject
however, in each case, to such additional provisions as shall be appropriate to
take into account developments after September 24, 1999.

         You agree (a) to indemnify and hold harmless Chase, CSI, their
affiliates and their respective officers, directors, employees, advisors, and
agents (each, an "INDEMNIFIED PERSON") from and against any and all losses,
claims, damages and liabilities to which any such indemnified person may become
subject arising out of or in connection with this Third Amended and Restated
Commitment Letter, the Facilities, the use of the proceeds thereof, the
Transactions or any related transaction or any claim, litigation, investigation
or proceeding relating to any of the foregoing, regardless of whether any
indemnified person is a party thereto, and to reimburse each indemnified person
upon demand for any legal or other expenses incurred in connection with
investigating or defending any of the foregoing, PROVIDED that the foregoing
indemnity will not, as to any indemnified person, apply to losses, claims,
damages, liabilities or related expenses to the extent they are found by a
final, non-appealable judgment of a court to arise from the willful misconduct
or gross negligence of such indemnified person, and (b) to reimburse Chase, CSI
and their affiliates on demand for all reasonable and documented out-of-pocket
expenses (including due diligence expenses, syndication expenses, consultant's
fees and expenses, travel expenses, and reasonable fees, charges and
disbursements of counsel) incurred in connection with the Facilities and any
related documentation (including this Third Amended and Restated


- --------------------------------------------------------------------------------
[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       6


Commitment Letter, the Term Sheet, the Amended and Restated Fee Letter and the
definitive financing documentation) or (without duplication of fees or costs for
administrative services covered in the Amended and Restated Fee Letter) the
administration, amendment, modification or waiver thereof. No indemnified person
shall be liable for any damages arising from the use by others of Information or
other materials obtained through electronic, telecommunications or other
information transmission systems, or for any special, indirect, consequential or
punitive damages in connection with the Facilities.

         You acknowledge that Chase and/or CSI may be providing debt financing,
equity capital or other services (including financial advisory services) to
other companies in respect of which you may have conflicting interests regarding
the transactions described hereby and otherwise. Neither Chase nor CSI will use
confidential information obtained from you by virtue of the transactions
contemplated hereby or other relationships with you in connection with the
performance by Chase or CSI of services for other companies, and neither Chase
nor CSI will furnish any such information to other companies. You also
acknowledge that neither Chase nor CSI has any obligation to use in connection
with the transactions contemplated hereby, or to furnish to you, confidential
information obtained from other companies.

         This Third Amended and Restated Commitment Letter shall not be
assignable by you without the prior written consent of Chase and CSI (and any
purported assignment without such consent shall be null and void), is intended
to be solely for the benefit of the parties hereto and is not intended to confer
any benefits upon, or create any rights in favor of, any person other than the
parties hereto. This Third Amended and Restated Commitment Letter may not be
amended or waived except by an instrument in writing signed by you, Chase and
CSI. This Third Amended and Restated Commitment Letter may be executed in any
number of counterparts, each of which shall be an original, and all of which,
when taken together, shall constitute one agreement. Delivery of an executed
signature page of this Third Amended and Restated Commitment Letter by facsimile
transmission shall be effective as delivery of a manually executed counterpart
hereof. This Third Amended and Restated Commitment Letter and the Amended and
Restated Fee Letter set forth the entire understanding of the parties with
respect thereto. This Third Amended and Restated Commitment Letter shall be
governed by, and construed in accordance with, the laws of the State of New
York.

         This Third Amended and Restated Commitment Letter is delivered to you
on the understanding that neither this Third Amended and Restated Commitment
Letter, the Term Sheet or the Amended and Restated Fee Letter nor any of their
terms or substance shall be disclosed, directly or indirectly, to any other
person except (a) to your officers, agents and advisors who are directly
involved in the consideration of this matter or (b) as may be compelled in a
judicial or administrative proceeding or as otherwise required by law (in which
case you agree to inform us promptly thereof), PROVIDED, that the foregoing
restrictions shall cease to apply (except in respect of the Amended and Restated
Fee Letter and its terms and substance) after this Third Amended and Restated
Commitment Letter has been accepted by you.

         The compensation, reimbursement, indemnification and confidentiality
provisions contained herein and in the Amended and Restated Fee Letter shall
remain in full force and


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[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       7


effect regardless of whether definitive financing documentation shall be
executed and delivered and notwithstanding the termination of this Third Amended
and Restated Commitment Letter or Chase's commitments hereunder.

         If the foregoing correctly sets forth our agreement, please indicate
your acceptance of the terms hereof and of the Term Sheet by returning to us
executed counterparts hereof not later than 9:00 a.m. New York City time, on
October 18, 1999 (at which time this Third Amended and Restated Commitment
Letter shall expire if not executed and delivered by you). Further, this Third
Amended and Restated Commitment Letter and the amendments of the Second Amended
and Restated Commitment and the Summary of Terms and Conditions attached thereto
as Exhibit A set forth herein and in the Term Sheet shall not become effective
UNLESS Grupo Mexico and Asarco execute and deliver a definitive Merger agreement
satisfactory to Chase and CSI, not later than 5:00 p.m., New York City time, on
October 23, 1999.

         Chase and CSI are pleased to have been given the opportunity to assist
you in connection with this important financing.


                                  Very truly yours,

                                  THE CHASE MANHATTAN BANK



                                  By:
                                     ------------------------------------
                                     Name:
                                     Title:

                                  CHASE SECURITIES INC.



                                  By:
                                     ------------------------------------
                                     Name:
                                     Title:


- --------------------------------------------------------------------------------
[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       8


Accepted and agreed to as of the
date first written above by:

GRUPO MEXICO, S.A. DE C.V.



By:
   -------------------------------
     Name:
     Title:



- --------------------------------------------------------------------------------
[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                                                     Exhibit A



                        SENIOR SECURED CREDIT FACILITIES
           Third Amended and Restated Summary of Terms and Conditions

                                October 15, 1999

         AS USED HEREIN, CAPITALIZED TERMS NOT OTHERWISE DEFINED HEREIN SHALL
HAVE THE RESPECTIVE MEANINGS ASCRIBED TO THEM IN THE THIRD AMENDED AND RESTATED
COMMITMENT LETTER TO WHICH THIS THIRD AMENDED AND RESTATED SUMMARY OF TERMS AND
CONDITIONS IS ATTACHED.

         This Third Amended and Restated Summary of Terms and Conditions hereby,
subject to the terms and conditions set forth in the Amended and Restated
Commitment Letter, amends and restates the Second Amended and Restated Summary
of Terms and Conditions dated October 7, 1999. The following sets forth the
terms and conditions for the senior secured credit facilities that will be made
available to ASMEX Corporation, a Delaware corporation ("ASMEX"), in connection
with Asmex' proposed cash tender offer (the "TENDER OFFER" and, together with
the Merger defined below, the "TRANSACTIONS") for shares of common stock of
Asarco Incorporated (the "SHARES"), a New Jersey corporation ("ASARCO"),
representing not less than 80% of the ordinary voting power of all of the shares
of capital stock of Asarco on a fully diluted basis, including stock of Asarco
owned by Grupo Mexico, S.A. de C.V., ("GRUPO MEXICO") and subsidiaries prior to
the Tender Offer (determined in a manner satisfactory to the Arranger). The
conditions precedent to the obligation of Asmex to purchase the Shares pursuant
to the Tender Offer will include, unless otherwise satisfied in connection with
the definitive Merger agreement with Asarco, the following: (i) invalidation,
redemption or other inapplicability of the rights issued under Asarco's
Shareholder Rights Agreement dated as of January 28, 1998, as amended, (ii)
invalidation or satisfaction of the requirements of Article 7 of Asarco's
Restated Certificate of Incorporation with respect to the Transactions such
that, following consummation of the Tender Offer, the Merger can be consummated
without the affirmative vote of the holders of any Asarco shares other than
Asmex, (iii) invalidity, inapplicability or satisfaction (if necessary) of
Article 10 of Asarco's Restated Certificate of Incorporation with respect to the
Transactions or the Facilities, (iv) satisfaction or inapplicability of the
requirements of Section 14A:10A of the New Jersey Business Corporation Act with
respect to the Merger such that following consummation of the Tender Offer the
Merger can be consummated without the affirmative vote of the holders of any
Asarco shares other than Asmex and (v) obtaining all regulatory approvals and
consents (including Hart-Scott-Rodino, and other approvals or consents, if any)
necessary to effect the Transactions. The purchase of shares will be funded
through credit facilities (the "A Tender Facility" referred to below) together
with certain cash from Grupo Minero Mexico, S.A. de C.V. ("GMM") and Grupo
Mexico. Following the purchase of the Shares pursuant to the Tender Offer,
Asmex, a direct wholly-owned subsidiary of Grupo Mexico, is to be merged into
Asarco with Asarco thereby becoming a wholly-owned subsidiary of Grupo Mexico
and with Asarco shareholders receiving solely cash consideration (the "MERGER").
The following also sets forth the terms and conditions for the other senior
credit facilities (the "R/C Facilities" referred to


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[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       2


below) that will be made available to Asarco upon and subsequent to consummation
of the Tender Offer.


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[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       3

I.       PARTIES

         Borrowers:                    Under the A Tender Facility, ASMEX
                                       Corporation ("ASMEX") and, after the
                                       Merger, Asarco; and under the R/C
                                       Facilities, Asarco (each of Asmex and
                                       Asarco being sometimes referred to below
                                       as a "BORROWER").

         Guarantor(s):                 Under the A Tender Facility, Grupo
                                       Mexico; and under the R/C Facilities,
                                       Grupo Mexico and, until consummation of
                                       the Merger, Asmex.

         Advisor, Lead Arranger
         and Book Manager:             Chase Securities Inc. (in such capacity,
                                       the "ARRANGER").

         Administrative Agent:         The Chase Manhattan Bank ("CHASE" and, in
                                       such capacity, the "ADMINISTRATIVE
                                       AGENT").

         Lenders:                      A syndicate of banks, financial
                                       institutions and other entities,
                                       including Chase, arranged by the Arranger
                                       in consultation with Grupo Mexico
                                       (collectively, the "LENDERS").

II.      TYPES AND AMOUNTS OF
         CREDIT FACILITIES

         1.   A TENDER FACILITY

              Type and Amount of
              Facility:                An aggregate principal amount of up to
                                       $823 million will be available to Asmex
                                       under a senior secured credit facility
                                       (the "A TENDER FACILITY").

              Availability:            The Loans under the A Tender Facility
                                       (the "A TENDER LOANS") shall be made in a
                                       single drawing on the Tender Closing Date
                                       (as defined below).

              Amortization:            The A Tender Loans shall be repayable in
                                       full on the date eighteen (18) months
                                       after the Tender Closing Date (the date
                                       on which


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[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       4

                                       the A Tender Loans are repayable, the
                                       "MATURITY DATE").

              Purpose:                 The proceeds of the A Tender Loans shall
                                       be used to purchase Shares.

         2.   R/C FACILITIES

              Type and Amount of
              Facility:                An aggregate principal amount of up to
                                       $250 million will be available to Asarco
                                       subsequent to consummation of the Tender
                                       Offer under a senior secured revolving
                                       credit facility (the "R/C FACILITIES").
                                       Such aggregate principal amount may,
                                       based on the actual amount of eligible
                                       accounts receivable of Asarco available
                                       to secure the R/C Facilities and in the
                                       sole discretion of the Arranger, be
                                       increased provided that the A Tender
                                       Loans are prepaid in an amount equal to
                                       the amount of such increase. Such
                                       aggregate principal amount may, based on
                                       the aggregate principal amount of
                                       Existing R/C Facilities (as defined
                                       below) available to Asarco and remaining
                                       in place subsequent to the consummation
                                       of the Tender Offer, be reduced in an
                                       amount equal to the amount of such
                                       Existing R/C Facilities.

              Availability:            The Loans under the R/C Facilities (the
                                       "R/C LOANS" and together with the A
                                       Tender Loans, the "LOANS") shall be
                                       available for borrowing, repayment and
                                       reborrowing during the period from the
                                       Tender Closing Date to the date
                                       thirty-three (33) months thereafter.

              Termination:             The R/C Facilities shall terminate, and
                                       all outstanding R/C Loans shall be
                                       repayable in full, on the date three (3)
                                       years after the Tender Closing Date.

              Purpose:                 The proceeds of the R/C Loans shall be
                                       used (i) to refinance outstanding
                                       indebtedness of Asarco under the Existing
                                       R/C Facilities (as defined below) and in
                                       the event of an increase in the amount of
                                       the R/C Facilities


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[GRAPHIC OMITTED]                                   Grupo Mexico, S.A. de C.V.


<PAGE>


                                       5


                                       above $250 million to repay a portion of
                                       outstanding A Tender Loans and (ii) for
                                       working capital purposes of Asarco. The
                                       "EXISTING R/C FACILITIES" means the
                                       credit facilities identified as such by
                                       Grupo Mexico and the Administrative Agent
                                       and which are on terms reasonably
                                       acceptable to the Arranger and Grupo
                                       Mexico. The aggregate principal amount of
                                       the Existing R/C Facilities is believed
                                       to total $800 million and to be for
                                       working capital purposes (based on
                                       publicly available information).

III.  CERTAIN PAYMENT PROVISIONS

      Fees and Interest Rates:         As set forth on Annex I.

      Optional Prepayments
      and Commitment Reductions:       All or a portion of the Loans may be
                                       prepaid at any time and the unutilized
                                       portion of the Facilities may be
                                       terminated in whole or in part (in
                                       minimum amounts to be agreed upon) at the
                                       respective Borrower's option (except, in
                                       the case of the R/C Facilities prior to
                                       the Tender Closing Date, at the option of
                                       Grupo Mexico). A Tender Loans once
                                       prepaid may not be reborrowed.

         Mandatory Prepayments and
         Commitment Reductions:        The A Tender Loans will be prepaid,
                                       undrawn commitments for A Tender Loans
                                       will be reduced and replaced, and R/C
                                       Loans will be prepaid, in that order, to
                                       the extent of the net cash proceeds
                                       received from the following (in each case
                                       subject to customary exclusions to be
                                       agreed):

                                       -- any asset sales by Asarco and
                                          designated subsidiaries

                                       -- any debt issuances by Asarco (other
                                          than R/C Loans, except for R/C Loans
                                          required to reduce the A Tender
                                          Facility)


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<PAGE>


                                       6


                                       -- any equity issuances by Asmex or
                                          Asarco (to any party other than Asmex
                                          or Grupo Mexico)

                                       -- any sale of Asarco stock

                                       -- any proceeds received by Asarco as a
                                          result of the exercise (by holders) of
                                          warrants relating to shares of Grupo
                                          Mexico held in a trust for the benefit
                                          of Asarco

IV.      GUARANTEES AND COLLATERAL

         Guarantees:                   (a) All obligations of Asmex (and, after
                                       the Merger, of Asarco) in respect of the
                                       A Tender Facility will be unconditionally
                                       guaranteed by Grupo Mexico.

                                       (b) All obligations of Asarco in respect
                                       of the R/C Facilities will be
                                       unconditionally guaranteed by Grupo
                                       Mexico until the A Tender Loans are
                                       repaid in full (except as otherwise noted
                                       below in the case of Alternative R/C
                                       Facilities, and provided the conditions
                                       for release of the collateral for such
                                       guarantee obligations have been met), and
                                       by Asmex until consummation of the
                                       Merger.

                                       The Borrowers and guarantors are
                                       collectively referred to herein as
                                       "CREDIT PARTIES."

         Collateral:                   (a) The obligations of Asmex in respect
                                       of the Facilities will be secured by a
                                       perfected first priority security
                                       interest in the Shares at any time owned
                                       by it.

                                       (b) The obligations of Grupo Mexico under
                                       its guarantees of the A Tender Facility
                                       and the R/C Facilities will be secured by
                                       a perfected first priority security
                                       interest in (1) shares of GMM
                                       representing 100% of the outstanding
                                       shares of GMM (other than shares not
                                       exceeding 1.50% held by others)


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                                       7


                                       and (2) all shares of Asarco held by
                                       Grupo Mexico, both immediately prior to
                                       the making of the A Tender Loans
                                       (presently representing approximately
                                       9.8% of the outstanding shares of Asarco)
                                       and after the Merger. In addition, Grupo
                                       Mexico will covenant to maintain at all
                                       times, in support of its guarantees (so
                                       long as they remain in effect), an amount
                                       of unencumbered cash and short-term
                                       authorized money market investments (to
                                       be agreed with the Arranger, including
                                       deposits with approved banks, which in
                                       Mexico shall include only Banamex and
                                       Bancomer) equal to the lower of (A) 6
                                       months of interest on the outstanding A
                                       Tender Loans and (B) $100 million.

                                       (c) The obligations of Asarco in respect
                                       of the R/C Facilities will be secured by
                                       accounts receivable of Asarco (except as
                                       otherwise provided below in the case of
                                       "Alternative R/C Facilities").

                                       The security documentation will provide
                                       that in the event of default and
                                       enforcement or foreclosure at a time when
                                       both Asarco shares and GMM shares are
                                       held as collateral for the defaulted
                                       obligation, the collateral agent will be
                                       instructed to exercise reasonable efforts
                                       (for a period of up to 45 days) to sell
                                       collateral consisting of Asarco shares
                                       before selling collateral consisting of
                                       GMM shares. Further, so long as any
                                       amounts under the A Tender Facility and
                                       the R/C Facilities remain outstanding,
                                       the proceeds of any sale of collateral
                                       consisting of shares shall be applied:
                                       first, to the payment of interest and
                                       principal on the A Tender Loans and the
                                       Alternative R/C Loans (if any), and
                                       second, to the payment of interest and
                                       principal on the R/C Loans.


Certain Releases of Collateral:        So long as no Default has occurred and
                                       is continuing:


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                                       8


                                       (a) The pledge of Asarco Shares securing
                                       guarantees of the R/C Loans will
                                       terminate when the A Tender Loans are
                                       repaid in full, PROVIDED that at such
                                       time (i) the R/C Loans and R/C Facilities
                                       are not Alternative R/C Loans and
                                       Alternative R/C Facilities, and (ii)
                                       Asarco is in compliance with its
                                       financial covenant relating to minimum
                                       EBITDA;

                                       (b) The pledge of Asarco Shares securing
                                       guarantees of the Alternative R/C Loans
                                       will terminate when (i) the A Tender
                                       Loans are repaid in full, and (ii)
                                       Asarco's senior unsecured long-term
                                       indebtedness is rated at or above BBB- by
                                       S&P and Baa3 by Moody's;

                                       (c) The pledge of GMM shares securing
                                       Grupo Mexico guarantees of the Facilities
                                       will be reduced pro rata (on a percentage
                                       basis) with reductions (by repayment) of
                                       the outstanding principal of the A Tender
                                       Loans, PROVIDED that (except as described
                                       in clause (d) below) the percentage of
                                       outstanding GMM shares remaining in
                                       pledge as security for guarantees of the
                                       Facilities may not thereby be reduced
                                       below 51% (or such higher percentage, if
                                       any, as is required for approval of
                                       corporate actions of GMM that are subject
                                       to shareholder consent and for election
                                       of a majority of the Board of Directors
                                       of GMM);

                                       (d) At such time as the outstanding
                                       principal of the A Tender Loans has been
                                       reduced (by repayment) to an amount equal
                                       to or less than 25% of the original
                                       principal amount of the A Tender Loans,
                                       all GMM shares remaining in pledge as
                                       security for guarantees of the Facilities
                                       will be released, PROVIDED that Asarco's
                                       senior unsecured long-term indebtedness
                                       is rated at or above BBB- by S&P and Baa3
                                       by Moody's.

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                                       9

V.       CERTAIN CONDITIONS            The availability of the Facilities shall
                                       be conditioned upon satisfaction of,
                                       among other things, the following
                                       conditions precedent (the date upon which
                                       all such conditions precedent shall be
                                       satisfied and the A Tender Facility is
                                       first utilized being herein called the
                                       "TENDER CLOSING DATE") and the occurrence
                                       of the first utilization of the A Tender
                                       Facility on or before the date nine (9)
                                       months after September 24, 1999, and
                                       other conditions precedent customary for
                                       facilities and transactions of this type,
                                       including evidence of authority and
                                       receipt of necessary consents and
                                       approvals:

                                       (a) Each Credit Party shall have executed
                                       and delivered satisfactory definitive
                                       financing documentation with respect to
                                       the Facilities (the "CREDIT
                                       DOCUMENTATION").

                                       (b) On or prior to the Tender Closing
                                       Date, cash in an amount not less than
                                       $270 million shall be contributed to the
                                       equity capital of Asmex through Grupo
                                       Mexico (i) from existing cash resources
                                       of GMM in an aggregate amount not less
                                       than $250 million, and (ii) from existing
                                       cash resources of Grupo Mexico, in an
                                       amount not less than $20 million;
                                       PROVIDED that in the event that Asmex
                                       requires cash in excess of such cash
                                       contributions and the A Tender Facility
                                       to consummate the Tender Offer, such
                                       additional cash shall be provided to
                                       Asmex through Grupo Mexico from other
                                       sources acceptable to the Arranger.

                                       (c) Satisfaction of the Arranger with all
                                       material terms and conditions of the
                                       Tender Offer and the definitive Merger
                                       agreement. In addition, the Tender Offer
                                       and the Merger shall have been, or shall
                                       be concurrently, consummated in a manner
                                       satisfactory to the Administrative Agent
                                       (including satisfaction of the
                                       Administrative Agent with all
                                       determinations as to the satisfaction of

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<PAGE>


                                       10


                                       material conditions thereunder) and no
                                       such condition of the Tender Offer or the
                                       definitive Merger agreement shall have
                                       been waived, amended, supplemented or
                                       otherwise modified without the prior
                                       written consent of the Administrative
                                       Agent; and Asmex shall have acquired
                                       shares of common stock of Asarco
                                       representing not less than 80% of the
                                       ordinary voting power of all of the
                                       shares of capital stock of Asarco on a
                                       fully diluted basis, including stock of
                                       Asarco owned by Grupo Mexico and
                                       subsidiaries prior to the Tender Offer
                                       (determined in a manner satisfactory to
                                       the Arranger).

                                       (d) Grupo Mexico and Asarco shall have
                                       entered into a definitive Merger
                                       agreement in form and substance
                                       satisfactory to the Administrative Agent,
                                       or Grupo Mexico shall have made
                                       satisfactory arrangements for the
                                       initiation of a statutory short-form
                                       merger, in each case pursuant to which
                                       Asarco will become a wholly-owned
                                       subsidiary of Grupo Mexico with Grupo
                                       Mexico able to exercise full control over
                                       the business and affairs of Asarco.

                                       (e) Invalidation or satisfaction of the
                                       requirements of Article 7 of Asarco's
                                       Restated Certificate of Incorporation
                                       with respect to the Transactions such
                                       that, following consummation of the
                                       Tender Offer, the Merger can be
                                       consummated without the affirmative vote
                                       of the holders of any Asarco shares other
                                       than Asmex; and invalidity,
                                       inapplicability or satisfaction (if
                                       necessary) of Article 10 of Asarco's
                                       Restated Certificate of Incorporation
                                       with respect to the Transactions or the
                                       Facilities.

                                       (f) Satisfaction or inapplicability of
                                       the requirements of Section 14A:10A of
                                       the New Jersey Business Corporation Act
                                       with respect to the Merger such that
                                       following consummation of the Tender
                                       Offer the Merger can be

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<PAGE>

                                      11


                                       consummated without the affirmative vote
                                       of the holders of any Asarco shares other
                                       than Asmex.

                                       (g) Invalidation, redemption or other
                                       inapplicability of the rights issued
                                       under Asarco's Shareholder Rights
                                       Agreement dated as of January 28, 1998,
                                       as amended.

                                       (h) There not being any statute, rule,
                                       regulation, judgment, order or injunction
                                       promulgated, entered, enforced, enacted,
                                       issued or applicable to the Tender Offer
                                       or the Merger by any domestic or foreign
                                       federal or state governmental regulatory
                                       or administrative agency or authority or
                                       court or legislative body or commission
                                       which (i) prohibits, or imposes any
                                       material limitations on, Grupo Mexico's
                                       or Asmex' ownership or operation of all
                                       or a material portion of Asarco's
                                       businesses or assets, (ii) prohibits, or
                                       makes illegal the acceptance for payment,
                                       payment for or purchase of Asarco common
                                       stock or the consummation of the Tender
                                       Offer or the Merger, (iii) results in a
                                       material delay in or restricts the
                                       ability of the Grupo Mexico, or renders
                                       Grupo Mexico unable, to accept for
                                       payment, pay for or purchase some or all
                                       of the tendered shares of Asarco common
                                       stock, or (iv) imposes material
                                       limitations on the ability of Asmex or
                                       Grupo Mexico effectively to exercise full
                                       rights of ownership of the Asarco common
                                       stock, including, without limitation, the
                                       right to vote the Asarco common stock
                                       purchased by it on all matters properly
                                       presented to Asarco's shareholders.

                                       (i) The Lenders, the Administrative Agent
                                       and the Arranger shall have received all
                                       fees required to be paid, and all
                                       expenses for which invoices have been
                                       presented, on or before the Tender
                                       Closing Date.

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<PAGE>


                                       12


                                       (j) The documents and materials filed
                                       publicly by Grupo Mexico (and its
                                       affiliates) and Asmex in connection with
                                       the Tender Offer shall have been
                                       furnished to the Administrative Agent and
                                       such documents and materials shall be
                                       reasonably satisfactory in form and
                                       substance to the Administrative Agent.

                                       (k) All regulatory and third party
                                       approvals and consents (including
                                       Hart-Scott-Rodino and other approvals and
                                       consents, if any) necessary in connection
                                       with the Transactions and the financing
                                       contemplated by the Third Amended and
                                       Restated Commitment Letter shall have
                                       been obtained and be in full force and
                                       effect and all applicable waiting periods
                                       shall have expired without any action
                                       being taken or threatened by any
                                       competent authority which could restrain,
                                       prevent or otherwise impose materially
                                       adverse conditions on the Transactions or
                                       the financing thereof, in each case on
                                       terms satisfactory to the Administrative
                                       Agent.

                                       (l) The Lenders shall have received (i)
                                       audited consolidated financial statements
                                       of Grupo Mexico, GMM and Grupo
                                       Ferroviario Mexicano, S.A. de C.V. ("RR")
                                       for the two most recent fiscal years (in
                                       the case of RR, one year) ended prior to
                                       the Tender Closing Date and (ii)
                                       unaudited interim consolidated financial
                                       statements of Grupo Mexico and of GMM for
                                       each quarterly period ended subsequent to
                                       the date of the latest financial
                                       statements delivered pursuant to clause
                                       (i) of this paragraph (l) as to which
                                       such financial statements are available.

                                       (m) The requisite Lenders shall be
                                       satisfied that upon making the initial A
                                       Tender Loans the requirements of
                                       Regulation U of the


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<PAGE>


                                       13


                                       Board of Governors of the Federal Reserve
                                       System shall have been complied with.

                                       (n) The Lenders shall have received such
                                       legal opinions (including opinions (i)
                                       from counsel to Grupo Mexico and its
                                       subsidiaries and (ii) from such special
                                       and local counsel as may be required by
                                       the Administrative Agent), documents and
                                       other instruments as are customary for
                                       transactions of this type or as they may
                                       reasonably request.

                                       (o) The negotiation, execution and
                                       delivery of definitive Credit
                                       Documentation with respect to the R/C
                                       Facilities satisfactory to all parties.
                                       Such Credit Documentation will contain a
                                       borrowing base condition to each
                                       utilization of the R/C Facilities,
                                       requiring that borrowings thereunder not
                                       exceed 85% of the amount of eligible
                                       receivables of Asarco securing the R/C
                                       Loans; provided that if such requirement
                                       renders the R/C Facilities initially
                                       unutilizable by Asarco in an amount
                                       sufficient to satisfy the financing needs
                                       of Asarco on the Tender Closing Date,
                                       such Credit Documentation will provide
                                       (until such time as such borrowing base
                                       and security requirement can be
                                       satisfied) for an alternative mechanism
                                       (referred to herein as the "ALTERNATIVE
                                       R/C FACILITIES") for utilization by
                                       Asarco of the R/C Facilities, with the
                                       following principal features (borrowings
                                       under such alternative mechanism being
                                       herein referred to as the "ALTERNATIVE
                                       R/C LOANS"):

                                       -- Alternative R/C Loans will not be
                                          secured by Asarco assets

                                       -- Alternative R/C Loans will be (i)
                                          guaranteed by Asmex (until the
                                          Merger), with such guarantee secured
                                          by the Shares, and (ii) guaranteed by
                                          Grupo Mexico,


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<PAGE>


                                       14


                                          with such guarantee secured by pledges
                                          of any Shares held by Grupo Mexico and
                                          of the shares of GMM; and such
                                          guarantee and pledges will not
                                          terminate or be fully released
                                          (notwithstanding contrary provisions
                                          elsewhere in this Term Sheet) until
                                          (in addition to other conditions noted
                                          above) Asarco's senior unsecured
                                          long-term indebtedness is rated at or
                                          above BBB- by S&P and Baa3 by Moody's.

                                       In the event that the working capital
                                       requirements of Asarco may be satisfied
                                       with Existing R/C Facilities subsequent
                                       to the consummation of the Tender Offer,
                                       the aggregate principal amount of the R/C
                                       Facilities may be reduced by the amount
                                       of such Existing R/C Facilities.

                                       (p) Hedging arrangements satisfactory to
                                       the Administrative Agent shall have been
                                       entered into (with counterparties
                                       acceptable to the Administrative Agent)
                                       for a "costless" collar covering
                                       production of GMM (with a minimum copper
                                       price of $0.75/lb with respect to 70,000
                                       tons per annum) and, upon the
                                       consummation of the Tender Offer,
                                       covering production of Asarco (with a
                                       minimum copper price of $0.75/lb with
                                       respect to 100,000 tons per annum), in
                                       each case for a period of at least one
                                       year from the Tender Closing Date.

         On-Going Conditions:          The making of each extension of credit
                                       shall be conditioned on (a) the accuracy
                                       of all representations and warranties in
                                       the Credit Documentation (including,
                                       without limitation, the material adverse
                                       change and litigation representations)
                                       and (b) there being no default or event
                                       of default in existence at the time of,
                                       or after giving effect to the making of,
                                       such extension of credit.


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                                       15


                                       As used herein and in the Credit
                                       Documentation a "MATERIAL ADVERSE CHANGE"
                                       shall mean (i) prior to the consummation
                                       of the Merger, any event, development or
                                       circumstance that has had or could
                                       reasonably be expected to have a material
                                       adverse effect on (a) the Transactions,
                                       (b) the business, assets, property or
                                       condition (financial or otherwise) of
                                       Grupo Mexico and its subsidiaries, GMM
                                       and its subsidiaries, or Asarco and its
                                       subsidiaries, in each case taken as a
                                       whole (including any material change,
                                       prior to consummation of the Tender
                                       Offer, in capital structure or
                                       indebtedness of Asarco and any material
                                       acquisition or divestiture of assets of
                                       Asarco or any of its subsidiaries taken
                                       as a whole, that in any such case has had
                                       or could reasonably be expected to have
                                       such a material adverse effect);
                                       PROVIDED, HOWEVER, that any adverse
                                       effect that copper prices have had or may
                                       have on the business, operations,
                                       property or financial condition of Grupo
                                       Mexico and its subsidiaries, GMM and its
                                       subsidiaries, or Asarco and its
                                       subsidiaries, in each case taken as a
                                       whole, shall not be deemed to have such a
                                       material adverse effect for purposes of
                                       this clause (i)(b), or (c) the validity
                                       or enforceability of any of the Credit
                                       Documentation or the rights and remedies
                                       of the Administrative Agent and the
                                       Lenders thereunder; and (ii) after the
                                       consummation of the Merger, any event,
                                       development or circumstance that has had
                                       or could reasonably be expected to have a
                                       material adverse effect on (a) the
                                       Transactions, (b) the business, assets,
                                       property, condition (financial or
                                       otherwise) or prospects of Grupo Mexico
                                       and its subsidiaries, GMM and its
                                       subsidiaries, or Asarco and its
                                       subsidiaries, in each case taken as a
                                       whole, or (c) the validity or
                                       enforceability of any of the Credit
                                       Documentation or the rights and remedies
                                       of

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<PAGE>


                                       16


                                       the Administrative Agent and the Lenders
                                       thereunder.

VI.      CERTAIN DOCUMENTATION MATTERS The Credit Documentation for the A Tender
                                       Facility and the R/C Facilities shall
                                       contain representations, warranties,
                                       covenants and events of default customary
                                       for financings of these types and other
                                       terms deemed appropriate by the Lenders,
                                       including, without limitation (but
                                       subject in appropriate cases to customary
                                       and other exceptions to be agreed), those
                                       specified below.

         Representations and
         Warranties:                   Financial statements (including pro forma
                                       financial statements); absence of
                                       undisclosed liabilities; no material
                                       adverse change; corporate existence;
                                       compliance with law; corporate power and
                                       authority; enforceability of Credit
                                       Documentation; no conflict with law or
                                       contractual obligations; no material
                                       litigation; no default; ownership of
                                       property; liens; intellectual property;
                                       no burdensome restrictions; taxes; margin
                                       stock regulations; Federal Reserve
                                       regulations; ERISA; Investment Company
                                       Act; subsidiaries; environmental matters;
                                       solvency; labor matters; accuracy of
                                       disclosure; and creation and perfection
                                       of security interests.

         Affirmative Covenants:        Delivery of financial statements,
                                       reports, accountants' letters, annual
                                       projections, officers' certificates and
                                       other information requested by the
                                       Lenders; payment of certain other
                                       obligations; all payments under the
                                       Facilities to be made free and clear of
                                       and without reduction by reason of
                                       present or future taxes (customary
                                       gross-up, indemnity and evidence of
                                       payment provisions); continuation of
                                       business and maintenance of existence and
                                       material rights and privileges;
                                       compliance with laws and material
                                       contractual obligations; maintenance of
                                       property and insurance; maintenance of
                                       books and records; right of


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<PAGE>


                                       17


                                       the Lenders to inspect property and books
                                       and records; notices of defaults,
                                       litigation and other material events;
                                       maintenance of required hedging
                                       arrangements; compliance with
                                       environmental laws; further assurances
                                       (including, without limitation, with
                                       respect to security interests in
                                       after-acquired property); ownership of
                                       GMM, of RR, of Asmex and, after the
                                       Merger, of Asarco; in the event of
                                       Asarco's utilization of the Alternative
                                       R/C Facility, Grupo Mexico to use its
                                       best efforts to cause Asarco to replace
                                       such utilization with R/C Loans that are
                                       not Alternative R/C Loans; and Grupo
                                       Mexico to use its best efforts to
                                       consummate the Merger as soon as
                                       practicable; and GMM to take reasonable
                                       steps to maintain investment grade
                                       ratings from S&P, Moody's and Duff &
                                       Phelps.

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<PAGE>


                                       18


         Financial Covenants:          Financial covenants relating to

                                       (a) Grupo Mexico (consolidated with all
                                       subsidiaries, and consolidated with all
                                       subsidiaries other than Southern Peru
                                       Copper Corporation)

                                          (i) Maximum Debt to EBITDA ratio

                                          (ii) Minimum ratio of EBITDA to
                                          interest expense

                                          (iii) Maximum Debt to Capital ratio

                                       (b) GMM and subsidiaries (for so long as
                                       any Grupo Mexico guarantee is in effect)

                                          (i) Debt to Capital ratio not
                                          exceeding 45%

                                          (ii) Minimum Tangible Net Worth

                                          (iii) Minimum Collections to Debt
                                          Service ratio

                                          (iv) Minimum annual level of export
                                          receivables

                                          (v) Minimum ratio of export
                                          receivables to SEN debt service

                                          (vi) Minimum ratio of EBITDA to
                                          interest expense

                                       (c) Asarco

                                          Minimum EBITDA levels

         Negative Covenants:           Limitations on: indebtedness (including
                                       preferred stock of subsidiaries);
                                       voluntary prepayments of indebtedness
                                       other than under the Facilities; liens
                                       (including negative pledge on stock of
                                       GMM, Asarco and RR); guarantee
                                       obligations; mergers, consolidations,
                                       liquidations and dissolutions; sales of
                                       assets; leases; capital expenditures;
                                       investments, loans and advances;
                                       dividends


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<PAGE>


                                       19


                                       and other payments in respect of capital
                                       stock; transactions with affiliates; sale
                                       and leasebacks; changes in fiscal year;
                                       and changes in lines of business.

         Special Covenant of Asmex:    Asmex shall covenant that it will not
                                       engage in any activity other than the
                                       Transactions, the A Tender Facility and
                                       activities necessary to effect the same.

         Events of Default:            (a) A Borrower shall fail to make any
                                       payment of principal of any Loan when
                                       due.

                                       (b) A Borrower shall fail to make any
                                       payment of interest or fees on any Loan,
                                       or any other payments required under the
                                       Credit Documentation, within 3 business
                                       days of due date.

                                       (c) Any representation or warranty by a
                                       Credit Party contained in the Credit
                                       Documentation or any certificate required
                                       to be delivered thereunder shall prove to
                                       have been incorrect in a material respect
                                       when made or deemed made.

                                       (d) A Credit Party (or any of its
                                       subsidiaries) shall fail to perform or
                                       observe any of its financial or other
                                       covenants under the Credit Documentation
                                       (subject to grace periods to be agreed).

                                       (e) Customary bankruptcy events of
                                       default, including (i) Grupo Mexico, GMM,
                                       Asarco or any of their subsidiaries
                                       (except for non-material subsidiaries (to
                                       be defined)) shall consent to the
                                       appointment of a receiver for itself or a
                                       substantial part of its property, (ii)
                                       Grupo Mexico, GMM, Asarco or any of their
                                       subsidiaries (except for non-material
                                       subsidiaries) shall seek relief under any
                                       applicable bankruptcy law or (iii) an
                                       involuntary bankruptcy or like proceeding
                                       shall have been commenced against Grupo
                                       Mexico, GMM, Asarco or any of their
                                       subsidiaries (except for non-material


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<PAGE>


                                       20


                                       subsidiaries) and such proceeding shall
                                       not have been stayed or vacated for a
                                       period of 60 days after the date it was
                                       commenced.

                                       (f) The security interest in any
                                       collateral furnished by a Credit Party
                                       listed above under "Guarantees and
                                       Collateral" shall cease to be a first
                                       priority perfected security interest as
                                       required hereunder.

                                       (g) Failure by a Credit Party to pay when
                                       due (after taking into account applicable
                                       grace periods) any unsecured or secured
                                       indebtedness (including capitalized lease
                                       obligations) or any default that permits
                                       the acceleration of the maturity of any
                                       such indebtedness and obligations or
                                       termination of any capital lease,
                                       aggregating in the case of all such
                                       indebtedness and obligations an amount
                                       equal to or exceeding threshold amounts
                                       to be agreed.

                                       (h) A final judgment or judgments for the
                                       payment of money shall be entered against
                                       Grupo Mexico, GMM, Asarco or any of their
                                       subsidiaries (except for non-material
                                       subsidiaries, and except, in the case of
                                       Asarco and its subsidiaries prior to
                                       consummation of the Tender Offer,
                                       judgments the existence of which was
                                       already disclosed and publicly available
                                       (or otherwise known by officers of the
                                       Arranger or Chase working on the
                                       Transactions) prior to September 24,
                                       1999) in an aggregate amount for all such
                                       persons equal to or exceeding threshold
                                       amounts to be agreed and which have not
                                       been bonded, stayed or satisfied for a
                                       period of 30 days or more.

                                       (i) There shall occur one or more ERISA
                                       Events which individually or in the
                                       aggregate results in or could reasonably
                                       be expected to result in a material
                                       adverse change; or there shall exist an
                                       amount of unfunded benefit liabilities
                                       (as defined in the


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<PAGE>


                                       21


                                       Statement of Financial Accounting
                                       Standards No. 87), individually or in the
                                       aggregate for all Plans (excluding for
                                       purposes of such computation any Plans
                                       with respect to which assets exceed
                                       benefit liabilities), which could
                                       reasonably be expected to result in a
                                       material adverse change.

                                       (j) There shall occur a change in control
                                       of GMM, Asmex or (after the consummation
                                       of the Tender Offer) Asarco; or Persons
                                       (to be identified) controlling Grupo
                                       Mexico (I.E., having the power to elect a
                                       majority of the members of the Board of
                                       Directors of Grupo Mexico) on September
                                       24, 1999, shall cease to maintain such
                                       control.

                                       (k) Default in the performance or
                                       observation of any term or condition in
                                       any material contract of Grupo Mexico,
                                       GMM or Asarco, or any of their
                                       subsidiaries, in each case taken as a
                                       whole, that could reasonably be expected
                                       to result in a material adverse change.

                                       (l) So long as any obligations under the
                                       A Tender Facility remain outstanding, any
                                       Default or acceleration under the A
                                       Tender Facility, or the R/C Facilities
                                       (including Alternative R/C Facilities) or
                                       the secured export note or other
                                       long-term debt obligations of GMM (with a
                                       threshold amount, in the case of GMM, of
                                       $30 million).

         Voting:                       Amendments and waivers with respect to
                                       the Credit Documentation shall require
                                       the approval of Lenders holding not less
                                       than a majority of the aggregate amount
                                       of the Loans thereunder and commitments
                                       under the related Facilities, except that
                                       (a) the consent of each Lender directly
                                       affected thereby shall be required with
                                       respect to (i) changes in the maturity of
                                       any Loan,


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<PAGE>


                                       22


                                       (ii) reductions in the rate of interest
                                       or any fee or extensions of any due date
                                       thereof, (iii) increases in the amount or
                                       extensions of the expiry date of any
                                       Lender's commitment and (iv)
                                       modifications to the pro rata provisions
                                       of the Credit Documentation and (b) the
                                       consent of 100% of the Lenders shall be
                                       required with respect to (i)
                                       modifications to any of the voting
                                       percentages and (ii) releases of any
                                       guarantee other than of a non-material
                                       subsidiary (to be defined) or all or any
                                       substantial part of the collateral.

         Assignments and
         Participations:               The Lenders shall be permitted to assign
                                       and sell participations in their Loans
                                       and commitments, subject, in the case of
                                       assignments (other than to another Lender
                                       or to an affiliate of a Lender), to the
                                       consent of the Administrative Agent and
                                       Grupo Mexico (which consent in each case
                                       shall not be unreasonably withheld,
                                       provided that if a default shall have
                                       occurred and be continuing Grupo Mexico's
                                       consent shall not be necessary). In the
                                       case of partial assignments (other than
                                       to another Lender or to an affiliate of a
                                       Lender of any interest in the A Tender
                                       Facility), the minimum assignment amount
                                       shall be $5,000,000 unless otherwise
                                       agreed by Grupo Mexico and the
                                       Administrative Agent. Each assignment
                                       shall be subject to payment to the
                                       Administrative Agent of a processing fee
                                       of $3,500. Participants shall have the
                                       same benefits as the Lenders from which
                                       they acquired their participations with
                                       respect to yield protection and increased
                                       cost provisions. Voting rights of
                                       participants shall be limited to those
                                       matters with respect to which the
                                       affirmative vote of the Lender from which
                                       it purchased its participation would be
                                       required as described in items (a) and
                                       (b) of the paragraph on "Voting" above.
                                       Pledges of Loans in accordance with
                                       applicable law shall be permitted without
                                       restriction.


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<PAGE>


                                       23


         Yield Protection:             The Credit Documentation shall contain
                                       customary provisions (a) protecting the
                                       Lenders against increased costs or loss
                                       of yield resulting from changes in
                                       reserve, tax, capital adequacy and other
                                       requirements of law and from the
                                       imposition of or changes in withholding
                                       or other taxes and (b) indemnifying the
                                       Lenders for "breakage costs" incurred in
                                       connection with, among other things, any
                                       prepayment of a Eurodollar Loan (as
                                       defined in Annex I) on a day other than
                                       the last day of an interest period with
                                       respect thereto.

         Expenses and
         Indemnification:              The Borrowers shall pay (a) all
                                       reasonable out-of-pocket expenses of the
                                       Administrative Agent and the Arranger
                                       associated with the syndication of the
                                       Credit Facilities and the preparation,
                                       execution, delivery and administration of
                                       the Credit Documentation and any
                                       amendment or waiver with respect thereto
                                       (including the reasonable fees,
                                       disbursements and other charges of
                                       counsel) and (b) all out-of-pocket
                                       expenses of the Administrative Agent and
                                       (after an Event of Default) of the
                                       Lenders (including the fees,
                                       disbursements and other charges of
                                       counsel) in connection with the
                                       enforcement of the Credit Documentation.

                                       The Administrative Agent, the Arranger
                                       and the Lenders (and their affiliates and
                                       their respective officers, directors,
                                       employees, advisors and agents) will have
                                       no liability for, and will be indemnified
                                       and held harmless against, any loss,
                                       liability, cost or expense incurred in
                                       respect of the financing contemplated
                                       hereby or the use or the proposed use of
                                       proceeds thereof (except to the extent
                                       resulting from the gross negligence or
                                       willful misconduct of the indemnified
                                       party).

         Governing Law and Forum:      State of New York.

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<PAGE>


                                       24


         Counsel to the Administrative
         Agent and the Arranger:       Milbank, Tweed, Hadley & McCloy LLP, and
                                       Ritch, Heather y Mueller S.C.






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