RIO ALGOM LTD/NEW/
SC 13D/A, 2000-08-25
METALS SERVICE CENTERS & OFFICES
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<PAGE>   1
=============================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
     TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a)

                                (Amendment No. 3)

                                RIO ALGOM LIMITED
                                (Name of Issuer)

                                  Common Shares
                         (Title of Class of Securities)

                                    766889109
                                 (CUSIP Number)

                                Kevin N. Thompson
                  Vice-President, Secretary and General Counsel
                                  Noranda Inc.
               P.O. Box 755, BCE Place, 181 Bay Street, Suite 4100
                            Toronto, Ontario M5J 2T3
                                 (416) 982-7475
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 August 22, 2000
             (Date of Event Which Requires Filing of This Statement)

         If the filing person has previously filed a statement on Schedule 13G
to report the acquisition that is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box [ ].

                         (Continued on following pages)

                              (Page 1 of 9 Pages)
================================================================================


<PAGE>   2



<TABLE>
<CAPTION>
<S>                                                                   <C>
------------------------------------------------                      ----------------------------------------------
CUSIP No. 766889109                                      13D                         Page 2 of 9 Pages
------------------------------------------------                      ----------------------------------------------

--------------------------------------------------------------------------------------------------------------------
1         NAME OF REPORTING PERSONS
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

          NORANDA INC.
--------------------------------------------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) [ ]
                                                                                                        (b) [ ]

          NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
3         SEC USE ONLY


--------------------------------------------------------------------------------------------------------------------
4         SOURCE OF FUNDS

          OO
--------------------------------------------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEM 2(d) or 2(e)                                                                             [ ]


--------------------------------------------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

          ONTARIO, CANADA
--------------------------------------------------------------------------------------------------------------------
                         7      SOLE VOTING POWER
       NUMBER OF                         5,406,038 SHARES
         SHARES          -------------------------------------------------------------------------------------------
     BENEFICIALLY        8      SHARED VOTING POWER
        OWNED BY                         NOT APPLICABLE
          EACH           -------------------------------------------------------------------------------------------
       REPORTING         9      SOLE DISPOSITIVE POWER
      PERSON WITH                        5,406,038 SHARES
                         -------------------------------------------------------------------------------------------
                         10     SHARED DISPOSITIVE POWER
                                         NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          5,406,038 SHARES
--------------------------------------------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                         [ ]

          NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          8.9%
--------------------------------------------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON

          CO
--------------------------------------------------------------------------------------------------------------------
</TABLE>





<PAGE>   3



<TABLE>
<CAPTION>
<S>                                                                   <C>
------------------------------------------------                      ----------------------------------------------
CUSIP No. 766889109                                      13D                         Page 3 of 9 Pages
------------------------------------------------                      ----------------------------------------------

--------------------------------------------------------------------------------------------------------------------
1         NAME OF REPORTING PERSONS
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

          BRASCAN CORPORATION
--------------------------------------------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) [ ]
                                                                                                        (b) [ ]

          NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
3         SEC USE ONLY


--------------------------------------------------------------------------------------------------------------------
4         SOURCE OF FUNDS

          NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEM 2(d) or 2(e)                                                                             [ ]

          NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

          ONTARIO, CANADA
--------------------------------------------------------------------------------------------------------------------
                         7      SOLE VOTING POWER
       NUMBER OF                         NOT APPLICABLE
         SHARES          -------------------------------------------------------------------------------------------
     BENEFICIALLY        8      SHARED VOTING POWER
        OWNED BY                         NOT APPLICABLE
          EACH           -------------------------------------------------------------------------------------------
       REPORTING         9      SOLE DISPOSITIVE POWER
      PERSON WITH                        NOT APPLICABLE
                         -------------------------------------------------------------------------------------------
                         10     SHARED DISPOSITIVE POWER
                                         NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          5,406,038 SHARES HELD INDIRECTLY THROUGH ITS INTEREST IN ITS AFFILIATE, NORANDA INC.
--------------------------------------------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                         [ ]

          NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          8.9%
--------------------------------------------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON

          CO
--------------------------------------------------------------------------------------------------------------------
</TABLE>




<PAGE>   4



<TABLE>
<CAPTION>
<S>                                                                   <C>
------------------------------------------------                      ----------------------------------------------
CUSIP No. 766889109                                      13D                         Page 4 of 9 Pages
------------------------------------------------                      ----------------------------------------------

--------------------------------------------------------------------------------------------------------------------
1         NAME OF REPORTING PERSONS
          I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

          EDPERPARTNERS LIMITED
--------------------------------------------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) [ ]
                                                                                                        (b) [ ]

          NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
3         SEC USE ONLY


--------------------------------------------------------------------------------------------------------------------
4         SOURCE OF FUNDS

          NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEM 2(d) or 2(e)                                                                             [ ]

          NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

          ONTARIO, CANADA
--------------------------------------------------------------------------------------------------------------------
                         7      SOLE VOTING POWER
       NUMBER OF                         NOT APPLICABLE
         SHARES          -------------------------------------------------------------------------------------------
     BENEFICIALLY        8      SHARED VOTING POWER
        OWNED BY                         NOT APPLICABLE
          EACH           -------------------------------------------------------------------------------------------
       REPORTING         9      SOLE DISPOSITIVE POWER
      PERSON WITH                        NOT APPLICABLE
                         -------------------------------------------------------------------------------------------
                         10     SHARED DISPOSITIVE POWER
                                         NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          5,406,038 SHARES HELD INDIRECTLY THROUGH ITS INTEREST IN ITS AFFILIATE, NORANDA INC.
--------------------------------------------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                         [ ]

          NOT APPLICABLE
--------------------------------------------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          8.9%
--------------------------------------------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON

          CO
--------------------------------------------------------------------------------------------------------------------
</TABLE>






<PAGE>   5

----------------------------                      ------------------------------
CUSIP No. 766889109                     13D             Page 5 of 9 Pages
----------------------------                      ------------------------------


         This Amendment No. 3 to Schedule 13D, which was originally filed on
April 24, 2000 (the "Original Schedule 13D") and amended on June 23, 2000
("Amendment No. 1") and July 20, 2000 ("Amendment No. 2"), relating to the
Common Shares of Rio Algom Limited ("Rio Algom"), a corporation incorporated
under the laws of the Province of Ontario, Canada, is being filed by Noranda
Inc. ("Noranda"), Brascan Corporation ("Brascan"), and EdperPartners Limited
("EdperPartners"), with Noranda, Brascan and EdperPartners being sometimes
referred to hereinafter as the "Reporting Persons." Except as set forth in this
Amendment No. 3, the information contained in the Original Schedule 13D, as
amended by Amendment No. 1 and Amendment No. 2, has not changed. All dollar
amounts shown in this Amendment No. 3 are in Canadian dollars.

         This Amendment No. 3 relates to an unsolicited tender offer announced
by Noranda to purchase all of the outstanding Common Shares of Rio Algom not
currently owned by it, at a purchase price of $24.50 per share, without
interest, upon the terms and conditions to be contained in the Offer and
Circular and related Letter of Transmittal to be sent to the shareholders of Rio
Algom (the "Offer"). The Offer will be effected by Noranda pursuant to Canadian
law.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         The total amount of funds used by Noranda to purchase the Common Shares
of Rio Algom purchased by it since the date of Amendment No. 2 (as listed in
Item 5(c) below) was approximately $7.2 million. Noranda obtained such funds
through the issuance of commercial paper. The notes mature within 365 days from
the date of issuance. Noranda maintains unused committed term credit facilities
and cash in amounts sufficient to meet payment at maturity of the aggregate
principal amount and accrued interest on all outstanding notes.

         The total amount of funds required by Noranda to purchase all of the
Common Shares of Rio Algom subject to the Offer will be approximately $1.5
billion. Noranda expects to fund the purchase price through a combination of
cash on hand, borrowings under committed credit facilities and advances under
the Agreement referred to below.

         Noranda has entered into an Agreement with Corporacion Nacional del
Cobre de Chile ("Codelco"), dated August 22, 2000 (the "Agreement"), pursuant to
which Noranda has agreed to sell to Codelco a 50% interest in Rio Algom's assets
upon the close of an amalgamation of Rio Algom into Noranda for an aggregate
price equal to one-half the amount paid by Noranda for the Common Shares of Rio
Algom plus one-half of the value of Rio Algom's publicly issued debt assumed in
the transaction. In the Agreement, Codelco has agreed to advance to Noranda 50%
of the funds necessary to purchase the Common Shares of Rio Algom tendered
pursuant to the Offer and 50% of the funds necessary to effect a compulsory
acquisition or second stage amalgamation transaction. In connection with such
advances, Noranda has agreed to pledge to Codelco 50% of the Common Shares of
Rio Algom held by Noranda at the time of each advance.

<PAGE>   6

--------------------------------                      --------------------------
CUSIP No. 766889109                    13D                Page 6 of 9 Pages
--------------------------------                      --------------------------


ITEM 4.  PURPOSE OF TRANSACTION.

         The purpose of the Offer is to enable Noranda to acquire the entire
equity interest in Rio Algom not currently owned by it, and thereby to acquire
control of Rio Algom.

         If at least 90% of the outstanding Common Shares of Rio Algom, on a
fully diluted basis (excluding Common Shares of Rio Algom owned by Noranda on
the date of the Offer) are validly tendered pursuant to the Offer, Noranda will
invoke its statutory right of compulsory acquisition in accordance with the
provisions of Section 188 of The Business Corporations Act (Ontario).

         If the Offer is successful and Noranda acquires at least two-thirds but
less than 90% of the outstanding Common Shares of Rio Algom, Noranda will seek
to hold as soon as practicable a meeting of Rio Algom's shareholders to vote
upon an acquisition by Noranda of Rio Algom's remaining Common Shares through an
amalgamation transaction in which Rio Algom becomes a wholly-owned subsidiary of
Noranda and the remaining shareholders of Rio Algom receive the same
consideration per share as was paid in the Offer.

         Noranda has agreed to sell a 50% interest in Rio Algom's assets upon
the close of a compulsory acquisition or second stage amalgamation transaction
to Codelco for an aggregate price equal to one-half the amount paid by Noranda
for the Common Shares of Rio Algom plus one-half of the value of Rio Algom's
publicly issued debt assumed in the transaction. Although Noranda has no current
intention to sell any Common Shares of Rio Algom held by it or purchased
pursuant to the Offer, it reserves the right, subject to applicable laws, to
make sales or enter into agreements to make sales at any time after the
expiration of the Offer.

         If the Offer is successful, Noranda will seek to cause Rio Algom's
Board of Directors to be reconstituted with an equal number of nominees of
Noranda and Codelco.

         Noranda and Codelco have agreed to jointly manage each of Rio Algom's
copper assets. Noranda and Codelco have also agreed that they will, after the
close of the transaction, endeavor to dispose of all of Rio Algom's non-copper
assets in an orderly and expeditious manner, and that the proceeds of such
dispositions will be divided equally between them.

         The purchase of Common Shares of Rio Algom by Noranda pursuant to the
Offer, by reducing the number of shares outstanding, might cause Rio Algom to be
de-listed from the Toronto Stock Exchange or the New York Stock Exchange. Such
purchase might also allow Rio Algom to terminate its registration under the
United States federal securities laws. If the Offer is successful, Noranda might
seek to cause such de-listings and de-registrations. If a compulsory acquisition
or second stage amalgamation transaction were to occur, Rio Algom's Common
Shares would likely no longer trade on any public market or exchange or be
subject to the reporting requirements of the United States federal securities
laws.

<PAGE>   7

----------------------------                         ---------------------------
CUSIP No. 766889109                       13D            Page 7 of 9 Pages
----------------------------                         ---------------------------


ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

         (a) Noranda owns 5,406,038 Common Shares of Rio Algom, representing
approximately 8.9% of the outstanding Common Shares of Rio Algom (based upon the
60,625,924 Common Shares reported as outstanding by Rio Algom in its Annual
Report for its fiscal year ended December 31, 1999). Brascan and EdperPartners
do not directly own any Common Shares of Rio Algom, but may be deemed to
beneficially own the Common Shares of Rio Algom held by Noranda.

         (b) Noranda has the sole power to direct the vote and sole power to
direct the disposition of all the Common Shares of Rio Algom held by it. The
other Reporting Persons have the indirect power to direct the vote and to direct
the disposition of the Common Shares of Rio Algom held by Noranda through their
respective direct and/or indirect interests in Noranda.

         (c) Since the date of Amendment No. 2, Noranda made the following
purchases of Common Shares of Rio Algom: 303,630 shares on July 21, 2000 at
$17.50 per share; 65,700 shares on July 26, 2000 at $17.266 per share; and
43,900 shares on July 27, 2000 at $17.40 per share. Noranda made each of these
purchases from a broker.

         (d)      Not applicable.

         (e)      Not applicable.

ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
TO SECURITIES OF THE ISSUER.

         Pursuant to the Agreement, Noranda has agreed to effect the Offer, a
compulsory acquisition or second stage amalgamation transaction and an
amalgamation of Rio Algom into Noranda and thereafter to sell a 50% interest in
Rio Algom's assets to Codelco for an aggregate price equal to one-half the
amount paid by Noranda for the Common Shares of Rio Algom plus one-half of the
value of Rio Algom's publicly issued debt assumed in the transaction. In the
Agreement, Codelco has agreed to advance to Noranda 50% of the funds necessary
to complete the Offer and the compulsory acquisition or second stage
amalgamation transaction, and Noranda has agreed to pledge to Codelco 50% of the
Common Shares of Rio Algom held by Noranda at the time of each advance, as
described in Item 3 above.
<PAGE>   8



--------------------------                           ---------------------------
CUSIP No. 766889109                      13D              Page 8 of 9 Pages
--------------------------                           ---------------------------


ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

         99.1     Press Release, dated August 22, 2000

         99.2     Agreement, dated August 22, 2000, by and between Noranda Inc.
                  and Corporacion Nacional del Cobre de Chile (portions of
                  which are subject to a request for confidential treatment, as
                  noted in the Agreement)

         99.3     Offer and Circular*

         99.4     Letter of Transmittal*

         99.5     Notice of Guaranteed Delivery*

         99.6     Schedule of Directors and Executive Officers of the Reporting
                  Persons (incorporated by reference to Exhibit 99.1 to
                  Amendment No. 1)

         99.7     Joint Filing Agreement Required by Rule 13d-1(k)(incorporated
                  by reference to Exhibit 99.2 to the Original Schedule 13D)


* Noranda will file these documents at such time as they are completed and
mailed to the shareholders of Rio Algom.


<PAGE>   9



                                   SIGNATURES

         After reasonable inquiry and to the best of our knowledge and belief,
we certify that the information set forth in this statement is true, complete
and correct.

August 25, 2000                             NORANDA INC.


                                            By: /s/ Aaron W. Regent
                                                -------------------------------
                                            Name:  Aaron W. Regent
                                            Title: Executive Vice-President,
                                            Chief Financial Officer


                                            EDPERPARTNERS LIMITED


                                            By: /s/ David W. Kerr
                                                -------------------------------
                                            Name:  David W. Kerr
                                            Title: Co-Chief Executive


                                            BRASCAN CORPORATION


                                            By: /s/ Jack L. Cockwell
                                                -------------------------------
                                            Name:  Jack L. Cockwell
                                            Title: President and Chief
                                            Executive Officer

<PAGE>   10
[NORANDA LOGO]

                                  NEWS RELEASE

FOR IMMEDIATE RELEASE



          NORANDA OFFERS TO ACQUIRE RIO ALGOM FOR CDN$1.5 BILLION CASH
      AT CLOSING, CODELCO TO PURCHASE 50% INTEREST IN ASSETS FROM NORANDA


TORONTO, AUGUST 22, 2000 - Noranda Inc. today announced that it will offer to
acquire all of the outstanding common shares of Rio Algom Limited (TSE and NYSE:
ROM) for CDN$24.50 cash per common share, for a total consideration of CDN$1.5
billion. Noranda expects to mail its offer to the Rio Algom shareholders within
the next 10 days. Rio Algom has approximately 60.6 million common shares
outstanding, of which Noranda already owns approximately 9%.

HIGHLIGHTS
--------------------------------------------------------------------------------
     -    Noranda will offer $24.50 per share cash for Rio Algom common shares,
          a 35% premium above its TSE closing price on August 21, 2000 of $18.10
     -    Completion of the acquisition will:
               -    Increase Noranda's copper production and copper reserves
               -    Complement Noranda's existing growth profile
               -    Raise Noranda's ownership in the Antamina project
               -    Provide opportunity for integrating Rio Algom's Spence
                    copper deposit with Noranda's Altonorte smelter in Chile
               -    Strengthen relationship with Codelco, the world's largest
                    copper producer
     -    On closing, Noranda has agreed to sell Codelco a 50% interest in Rio
          Algom's assets


--------------------------------------------------------------------------------
Rio Algom is a Toronto-headquartered mining and metals distribution company that
produced approximately 184,000 tonnes of copper in 1999. Its assets are located
in Chile, Argentina, Peru, Canada and the United States.

Noranda's offer will be conditional upon, among other things, the acquisition of
at least two-thirds of the outstanding common shares of Rio Algom, the receipt
of regulatory approvals, and Rio Algom's board of directors waiving the
application of its Shareholder Protection Rights Plan.

A COMPELLING OFFER TO RIO ALGOM COMMON SHAREHOLDERS
David W. Kerr, Noranda's President and Chief Executive Officer, commented: "We
believe that this is a compelling offer for the Rio Algom shareholders. In
particular, it provides Rio Algom common shareholders with the following
important benefits:


<PAGE>   11
                                       2

[LOGO]

     -    A premium of 35% over its TSE closing price on August 21, 2000 of
          $18.10 per share; and,

     -    An opportunity to receive immediate liquidity for their investment."

AGREEMENT WITH CODELCO
In a separate agreement, Noranda has agreed to sell to Corporacion Nacional del
Cobre (Codelco) a 50% interest in Rio Algom's assets, immediately upon closing
and at the same effective price paid by Noranda. The two companies will jointly
manage the assets. Codelco, 100%-owned by the Chilean State, is the world's
largest copper producer and controls approximately 20% of the world's proven and
probable copper reserves. In 1999, it produced 1.6 million tonnes or
approximately 16% of world copper production.

"Noranda already has a long-standing relationship with Codelco which this
transaction will further solidify. It will help Noranda to share risk, realize
operational synergies to maximize the value of its assets and may lead to other
opportunities," Kerr added.

Mr. Juan Villarzu R., Codelco's Executive President, stated: "This transaction
adds to Codelco's existing portfolio of long-life, high-quality assets and
executes on our previously announced intention of expanding internationally.
Furthermore, the location of several of Rio Algom's assets in the southern
hemisphere provides Codelco with the opportunity to achieve significant
synergies with our existing operations." He added that: "Noranda is a
well-established international mining and metals company with growing interests
in Latin America. We look forward to completing this transaction given the
complementary nature of Noranda's and Codelco's respective copper strategies."

A PORTFOLIO OF COPPER ASSETS TO SUSTAIN NORANDA'S GROWTH PROFILE
"This acquisition represents an attractive investment opportunity for Noranda.
It fits with our strategy to increase our exposure to long-life and low-cost
base-metal mining assets," Kerr said. "It will also generate meaningful
synergies, increase mineral reserves and complement Noranda's existing growth
profile with its major projects either nearing completion or well on track."

-    Cerro Colorado - Rio Algom's wholly-owned copper mine, Cerro Colorado, is
     located in northern Chile. The mine produced 220 million pounds of copper
     cathodes in 1999 through a copper leach SX-EW operation. Total reserves
     were 194.2 million tonnes grading 1.0% copper at January 1, 2000.

-    Antamina -- Noranda is already an owner along with Rio Algom, Teck
     Corporation and Mitsubishi Corporation of the Antamina copper/zinc mine
     project in Peru which, when completed in 2001, will be the largest
     copper/zinc mine in the world. Each of Noranda and


<PAGE>   12

                                       3

[LOGO]

     Rio Algom own 33.75% of the project. Through this transaction, Noranda will
     increase its effective interest in Antamina to 50.6% and will gain access
     to an additional 83 million tonnes of copper reserves at an average copper
     equivalent grade of 1.7%.

-    Spence -- The undeveloped Spence copper deposit is estimated to contain 398
     million tonnes of copper reserves with an average grade of 1.0%. It is
     located in northern Chile, near Noranda's Altonorte copper smelter. If
     operated on an integrated basis, capital investment, operating cost savings
     and revenue enhancements can be achieved.

-    Alumbrera - Rio Algom has a 25% interest in the Alumbrera open-pit
     copper/gold mine in Argentina. Rio's share of the mine's reserves amounts
     to 110.5 million tonnes with an average copper grade of 0.53%.

-    Highland Valley Copper - Rio Algom has a 33.6% interest in the Highland
     Valley copper mine in British Columbia. Rio Algom's share of the mine's
     reserves is 130 million tonnes with an average copper grade of 0.417%.

The acquisition of Rio Algom would increase Noranda's annual copper mine
production from approximately 250,000 tonnes to 500,000 tonnes by 2005. In
addition, Noranda's copper reserves would immediately increase by approximately
73% and help to better balance its copper mining and metallurgical assets.

OTHER RIO ALGOM NON-COPPER ASSETS
Rio Algom also owns a variety of other assets, including wholly-owned Rio Algom
Metals Distribution (RAMD), a distributor of stainless steel and aluminum in
North America; 100% of a uranium mining operation in Wyoming and New Mexico; and
29% of Bullmoose Coal, located in British Columbia.

FINANCING
The total value of the transaction, including debt, is estimated to be
approximately $2.6 billion. Noranda is expected to fund its share of the
purchase price from cash on hand and committed credit facilities.

STRATEGY FOCUSED ON INCREASED RETURNS
"Noranda's strategy is to combine ownership of low-cost base-metal mines with
our industry-leading metallurgical technologies to deliver superior returns to
common shareholders. This will position Noranda as a premier base-metal producer
and provide meaningful benefits for our shareholders."


<PAGE>   13

                                       4

[LOGO]

The information relating to Rio Algom in this press release has been taken from
Rio Algom's public disclosure documents. Once mailed to Rio Algom shareholders,
Noranda's circular will be posted on its website at: www.noranda.com and
available by contacting Noranda at 1-888-551-5485.

NORANDA INC. is a leading international mining and metals company with more than
30 mining and metallurgical operations and projects under development in eight
countries. Noranda is one of the world's largest producers of zinc and nickel
and is a significant producer of copper, primary and fabricated aluminum, lead,
silver, gold, sulfuric acid and cobalt. Noranda is also a major recycler of
secondary copper, nickel and precious metals. Noranda employs over 17,000
people. It is listed on The Toronto Stock Exchange (NOR).

CODELCO is the world's largest producer of copper -- producing 1.6 million mft
in 1999, or approximately 16% of the western world's copper production -- and is
one of the world's lowest-cost copper producers. Codelco controls approximately
20% of the world's known copper reserves and is also the world's second largest
producer of molybdenum.

THIS NEWS RELEASE CONTAINS CERTAIN FORWARD-LOOKING STATEMENTS THAT REFLECT THE
CURRENT VIEWS AND/OR EXPECTATIONS OF NORANDA INC. WITH RESPECT TO ITS
PERFORMANCE, BUSINESS AND FUTURE EVENTS. SUCH STATEMENTS ARE SUBJECT TO A NUMBER
OF RISKS, UNCERTAINTIES AND ASSUMPTIONS. ACTUAL RESULTS AND EVENTS MAY VARY
SIGNIFICANTLY.

                                    -- 30 --

For more information:
NORANDA (www.noranda.com):

<TABLE>
<S>                                                       <C>
Mr. Aaron Regent                                          Mr. Denis Couture

Executive Vice-President and Chief Financial Officer      Vice-President, Public Affairs and Communications
416-982-7271                                              416-982-7020
[email protected]                                       [email protected]
-------------------                                       --------------------
</TABLE>


CODELCO (www.codelco.com):


Mr. Ivan Badilla

Coordinator of Communications
011-562-690-3221




<PAGE>   14




         THIS AGREEMENT (as it may be amended from time to time, this
"Agreement") is made as of August 22, 2000.

B E T W E E N:

                  CORPORACION NACIONAL DEL COBRE DE CHILE, a corporation
                  existing under the laws of Chile

                  (hereinafter referred to "C")

                                     - and -

                  NORANDA INC., a corporation existing under the laws of Canada

                  (hereinafter referred to as "N")

         WHEREAS the parties wish to enter into this Agreement to set out the
arrangements agreed between them with respect to a proposed takeover bid by N
for Rio Algom Limited, a corporation existing under the laws of Canada (the
"Target"), and the subsequent reorganisation and management of the assets of the
Target.

         NOW THEREFORE, for good and valuable consideration, the receipt and
adequacy of which is hereby acknowledged, the parties agree as follows:


                                    ARTICLE I


                              PROPOSED TRANSACTION
                              --------------------

1.1      ACQUISITION OF THE TARGET
         -------------------------

         N currently owns 8.9% of the total outstanding common shares of the
Target and will offer to acquire all of the remaining outstanding common shares
of the Target by way of (a) a takeover bid (the "Bid") and (b) if less than 100%
of the outstanding common shares shall have been acquired pursuant to the Bid, a
corporate compulsory acquisition or, if necessary, a second stage "squeeze-out"
amalgamation transaction (any such transaction or acquisition being a "Follow-up
Transaction"). A common share of the Target is hereinafter referred to as a
"Share".

1.2      FINANCING OF THE ACQUISITION OF SHARES
         --------------------------------------

         1.2.1    Subject to and in accordance with the terms of this Agreement,
                  N will sell to C (or, at the option of C, one or more of its
                  subsidiaries) and C will purchase (or, at


<PAGE>   15

                                      -2-

                  its option, will cause its subsidiary or subsidiaries to
                  purchase), in accordance with Article IV hereof, the interest
                  in each of the assets of the Target set forth in Schedule I
                  hereto plus a one-half interest in each of the Target's other
                  assets (including tax benefits), other than the Initially
                  Excluded Assets (as defined in section 4.2 hereof). The assets
                  shall be transferred by N to C (or, at C's option, one or more
                  subsidiaries of C) pursuant to an instrument or instruments of
                  transfer reflecting the terms and conditions set forth in this
                  Agreement and other customary terms.

         1.2.2    C commits to advance (or to cause a subsidiary to advance) to
                  N 50% of the Acquisition Costs (as defined in section 1.2.5
                  hereof) incurred by N in acquiring Shares in accordance with
                  this Agreement (the "Acquisition Financing"). The Acquisition
                  Financing shall be provided in two tranches. The first tranche
                  shall be advanced at the completion of the Bid and shall be in
                  an amount equal to 50% of (i) the Acquisition Costs of the
                  Shares tendered and acquired by N in the Bid and the Shares
                  held by N on the date of this Agreement and (ii) the
                  Acquisition Costs of any 5.5% Convertible Unsecured
                  Subordinated Debentures due February 1, 2007 of the Target
                  (the "Convertible Debentures) acquired at such time. The
                  second tranche shall be advanced upon completion of the
                  Follow-up Transaction and shall be in an amount equal to 50%
                  of the Acquisition Costs of the Shares acquired in such
                  transaction.

         1.2.3    The advances contemplated by section 1.2.2 ("Advances") shall
                  be made in Canadian dollars, shall bear no interest and shall
                  be evidenced by a promissory note or promissory notes and an
                  agreement reflecting the terms and conditions set forth in
                  this Agreement and other customary terms. As a condition to
                  each Advance, N shall ensure that C (or its subsidiary, as the
                  case may be) receives a first priority, perfected security
                  interest (the "Pledge") in 50% of the Shares and Convertible
                  Debentures held by N at the time of (a) in the case of the
                  first Advance, the completion of the Bid and (b) in the case
                  of the second Advance, the consummation of the Follow-up
                  Transaction (the "Collateral"). The Pledge shall secure N's
                  obligations in respect of the Advances and under this
                  Agreement and shall entitle C to vote the Shares and
                  Convertible Debentures included as part of the Collateral. The
                  Pledge shall be evidenced by a pledge agreement reflecting the
                  terms and conditions set forth in this Agreement and other
                  customary terms.

         1.2.4    The Advances shall be required to be repaid in full by N on
                  the earlier of (a) the date on which the amalgamation of the
                  Target with N as required by section 1.3 hereof occurs and (b)
                  ninety (90) days following the completion of the Bid, unless
                  the parties otherwise agree. A breach by N of any
                  representation, warranty, covenant or other agreement set
                  forth herein or in any other agreement entered into between N
                  and C (or any of C's subsidiaries) in connection herewith
                  shall



<PAGE>   16

                                      -3-

                  constitute an event of default under the terms of the Advances
                  which shall entitle C (or its subsidiary, as the case may be)
                  to exercise any and all of its remedies with respect to the
                  Pledge and the Advances.

         1.2.5    For all purposes of this Agreement, the "Acquisition Cost" of
                  any Share or Convertible Debenture acquired by N shall mean
                  (a) in the case of any Share, the purchase price per Share
                  acquired in or during the pendency of the Bid and (b) in the
                  case of any Convertible Debenture, the purchase price for such
                  Convertible Debentures.

1.3      POST-ACQUISITION ARRANGEMENTS
         -----------------------------

         Upon successfully completing the acquisition of all of the outstanding
Shares of the Target, N will, as expeditiously as possible but in no event later
than ninety (90) days following the completion of the Bid, unless the parties
shall otherwise agree, amalgamate the Target with N and immediately following
and on the same day as such amalgamation transfer to C (or, at C's option, one
or more subsidiaries of C), in accordance with Article IV hereof, the interest
in each of the assets of the Target set forth in Schedule I hereto plus a
one-half interest in each of the Target's other assets (including tax benefits),
except for the Initially Excluded Assets.


                                   ARTICLE II


                                 THE ACQUISITION
                                 ---------------

2.1      CONDUCT OF THE BID AND THE FOLLOW-UP TRANSACTION
         ------------------------------------------------

         2.1.1    The purchase price per share offered by N in the Bid shall be
                  Cdn.$24.50. The making of the Bid and the conduct of any
                  Follow-up Transaction by N, including the timing and specific
                  terms and conditions of the Bid and any Follow-up Transaction
                  (and including any amendments or modifications thereto, or
                  waivers of a condition thereof), shall be subject to the prior
                  written approval of C, in order to preserve C's right to
                  acquire interests in the assets of the Target in accordance
                  with Article IV hereof. The Bid and any Follow-up Transaction
                  shall be made in compliance with applicable Canadian and U.S.
                  securities and other laws.

         2.1.2    Notwithstanding clause 2.1.1, N shall have the right, without
                  the prior written approval of C, to extend the expiration date
                  of the Bid for such period or periods as may be required to
                  satisfy the conditions set forth in paragraphs (a), (b), (d)
                  or (e) of Schedule II hereto; provided that N shall not be
                  permitted to extend the expiration date of the Bid beyond
                  December 31, 2000 without the prior written approval of C.



<PAGE>   17
                                      -4-

2.2      STRUCTURE
         ---------

         2.2.1    The Bid will be conducted by N itself and not by a subsidiary
                  of N, unless the parties shall otherwise agree.

         2.2.2    The Bid shall be designed and conducted to eliminate
                  non-tendered Shares through a Follow-up Transaction.

         2.2.3    It is the express intention of the parties that N be able to,
                  and N will endeavor to, obtain an increase to fair market
                  value in the tax cost of all capital property (other than
                  depreciable property) of the Target upon the amalgamation of
                  the Target with N.

2.3      CONSIDERATION
         -------------

         The consideration offered for the Shares under the Bid and any
Follow-up Transaction shall consist solely of cash.

2.4      CONDITIONS TO THE BID
         ---------------------

         The Bid shall contain and be subject to the conditions substantially as
set forth in Schedule II hereto. To the extent that the satisfaction of any such
condition depends upon the sole judgment of N, N shall not, without the consent
of C, determine that such condition has been satisfied.

2.5      REPRESENTATIVES
         ---------------

         Each party shall nominate two representatives who together (but not
separately) shall be empowered to bind that party for all purposes under this
Agreement until such time as such party notifies the other party of a
replacement of one or both of its representatives.

2.6      EXPENSES
         --------

         All agreed joint expenses of the Bid shall be borne by the parties in
equal amounts. All expenses set forth in Schedule III hereto shall be for the
account of the party that incurred such expenses.

2.7      PRE-BID EVENTS
         --------------

         Each party will notify the other party promptly upon becoming aware of
any material, unanticipated transaction or event relating to or affecting the
Target. If any such event or transaction occurs and becomes known to the parties
after the announcement of the Bid and prior to its mailing (a "Pre-Bid Event"),
then C and N shall promptly consult with each other regarding the prospective
Bid and the proposed terms and conditions thereof. If at the end of the
seven-day


<PAGE>   18
                                      -5-


period following the date that they became aware of the Pre-Bid Event, N wishes
to proceed with the Bid on terms and conditions that C does not wish to approve
or N does not wish to proceed with the Bid (or does not wish to proceed on the
basis of terms and conditions that C is willing to approve), then either party
will have the right to terminate this Agreement upon written notice to the other
party. The parties acknowledge and agree that a Pre-Bid Event may include, but
is not limited to, an alternative bid by a third party or the Target or a
competing alternative transaction (a "Third-Party Bid") or a change that has or
is reasonably likely to have a material adverse effect on the structure,
business, affairs, operations, financial condition, liabilities or prospects of
the Target or its assets.

2.8      POST-BID EVENTS
         ---------------

         If an event occurs during the course of the Bid which would (a) relieve
N from a legal obligation to take up and pay for Shares tendered in the Bid or
(b) require an improvement to the economic terms of the Bid to make it
competitive with a Third-Party Bid (a "Post-Bid Event"), then C and N shall
promptly consult with each other regarding whether or not any amendments or
waivers should be made or given with respect to the terms and conditions of the
Bid. If, at the end of the seven-day period following the date that they became
aware of the Post-Bid Event, the parties have not agreed to the terms of any
such amendment or waiver, then either party will have the right to terminate
this Agreement upon written notice to the other party.

2.9      OPTION FOLLOWING TERMINATION
         ----------------------------

         2.9.1    If, within 90 days following the termination of this Agreement
                  as a result of a Third-Party Bid pursuant to section 2.7 or
                  2.8, N or C acquires, either alone or with any third party
                  pursuant to an agreement similar to this Agreement, 100% of
                  the Shares or all of the assets of the Target, such party (the
                  "Acquiring Party") shall, subject to all required consents and
                  regulatory approvals and the completion of the amalgamation of
                  the Target, offer to the other party (the "Non-Acquiring
                  Party") (a) one-half of the interest that the Acquiring Party
                  has acquired (the "Spence Interest") in Compania Minera
                  Riochilex S.A. (the "Spence project") and (b) one-half of the
                  interest that the Acquiring Party has acquired (the "Antamina
                  Interest") in the holding company for Compania Minera Antamina
                  S.A. (the "Antamina project") for an all-cash Canadian dollar
                  purchase price (the "Purchase Price") equal to (x) the Spence
                  Interest or the Antamina Interest, as the case may be,
                  multiplied by (y) the final Canadian dollar value (the "Final
                  Valuation") to be determined for the Target's total interest
                  in the Spence project or the Antamina project, as the case may
                  be, pursuant to the valuation procedure set forth in Schedule
                  IV hereto; PROVIDED that (I) if the Final Valuation for the
                  Target's total interest in the Spence project is less than
                  [confidential treatment requested] it shall be deemed to be
                  equal to [confidential treatment requested] and if it is more
                  than [confidential treatment requested] it shall be deemed to
                  be equal to [confidential treatment requested] and (II) if
                  the Final Valuation for the Target's total interest in the
                  Antamina project is less than [confidential treatment
                  requested] it


<PAGE>   19
                                      -6-


                  shall be deemed to be equal to [confidential treatment
                  requested] and if it is more than [confidential treatment
                  requested] it shall be deemed to be equal to [confidential
                  treatment requested].

         2.9.2    The Non-Acquiring Party shall have the right, for a period of
                  not more than 30 days following the offer described in section
                  2.9.1 (the "Valuation Request Period"), to make a written
                  request for a valuation of the Spence project, the Antamina
                  project or both (the "Valuation Request"). The parties shall
                  thereafter complete such valuation or valuations, in the
                  manner described in Schedule IV. After completion of the
                  valuation or valuations, the Non-Acquiring Party shall have an
                  additional 30 days (the "Acquisition Notice Period") in which
                  to notify the Acquiring Party of its election to acquire the
                  Spence Interest, the Antamina Interest, or both, at the
                  Purchase Price determined for such asset or assets (the
                  "Acquisition Notice"). If the Non-Acquiring Party delivers the
                  Acquisition Notice within the Acquisition Notice Period, the
                  parties shall, subject to all required consents and regulatory
                  approvals and the completion of the amalgamation of the
                  Target, complete the purchase and sale of the relevant assets
                  as soon as practicable following the date of the Acquisition
                  Notice. If the Non-Acquiring Party fails to make a Valuation
                  Request for a particular asset within the Valuation Request
                  Period or fails to deliver an Acquisition Notice for such
                  asset within the Acquisition Notice Period, the Acquiring
                  Party shall have no further obligations with respect to such
                  asset. Prior to the transfer of any asset pursuant to this
                  section 2.9, the parties shall enter into a shareholders'
                  agreement or shareholders' agreements containing the terms set
                  forth in Schedule VII hereto with respect to such asset and
                  such other terms as may be agreed between the parties.

         2.9.3    During the 90-day period following the termination of this
                  Agreement as a result of a Third-Party Bid pursuant to section
                  2.7 or 2.8, the terminating party shall not make any bid for,
                  or enter into any competing transaction involving, the Target
                  with the third-party offeror in such Third-Party Bid.

         2.9.4    The parties agree that so long as the Acquiring Party acquires
                  at least 50% of the assets of the Target in a transaction
                  contemplated by section 2.9.1, (a) the Spence Interest shall
                  not be less than 25% of the Spence project and (b) the
                  Antamina Interest shall not be less than 8.4375% of the
                  Antamina project.

2.10     TERMINATION OF AGREEMENT
         ------------------------

         2.10.1   Notwithstanding any other provision of this Agreement, if (i)
                  the Bid has not been mailed on or before November 7, 2000 for
                  any reason or (ii) the Bid has not been completed on or before
                  December 31, 2000 for any reason, then, subject to Section 7.1
                  hereof, this Agreement will terminate without any further
                  action being required on the part of either party unless
                  otherwise agreed between the parties.


<PAGE>   20
                                      -7-


         2.10.2   Notwithstanding any other provision of this Agreement, if
                  either party is in breach in any material respect of any
                  representation, warranty, covenant or other agreement under
                  this Agreement or any other agreement entered into between the
                  parties and/or any of their affiliates in connection with this
                  Agreement, then, subject to Section 7.1 hereof, the other
                  party will have the right to terminate this Agreement upon
                  written notice to the breaching party.

2.11     USE OF BID MATERIALS
         --------------------

         In the event of termination of this Agreement, either party shall be
permitted to make use of any materials, information, advice or documents
prepared or received by it or the other party or by the parties jointly as part
of or pursuant to the planning or implementation of the Bid, provided that such
party shall, except as may be required by applicable law, including in
connection with a subsequent bid by such party for the Target, keep confidential
any information relating exclusively to the other party or the Target in
accordance with Section 5.1


                                   ARTICLE III


                 POST-BID OWNERSHIP AND MANAGEMENT OF THE TARGET
                 -----------------------------------------------

3.1      TRANSITIONAL ARRANGEMENTS
         -------------------------

         3.1.1    On the date that N obtains control of the Target or as soon as
                  practicable thereafter, N shall cause the Board of Directors
                  of the Target to be reconstituted with an equal number of
                  nominees of C and N (the "New Board"). The New Board will meet
                  as often as may be necessary during the period following the
                  date on which N obtains control of the Target until the
                  successful implementation of the permanent arrangements
                  described in Section 4 (the "Transitional Period"). N shall
                  not permit the Target to take any action without the consent
                  of at least one of the Directors nominated by C.

         3.1.2    Each of the parties agrees to exercise all voting rights and
                  use its best efforts to cause its nominees to the New Board to
                  act at all times to further the provisions of and the
                  principles set forth in this Agreement to the fullest extent
                  possible. Each of the parties acknowledges and agrees that it
                  is responsible for ensuring that its nominees to the New Board
                  abide by the high standard of corporate conduct and governance
                  expected by and currently in place at both C and N.

         3.1.3    The key issues during the Transitional Period for which the
                  New Board shall have primary responsibility (the "Transitional
                  Issues") shall include the following:


<PAGE>   21
                                      -8-


                  (a)      completion of the acquisition of the remaining Shares
                           of the Target not tendered under the Bid;

                  (b)      making decisions with respect to the assets of the
                           Target pending implementation of the permanent
                           arrangements described in Section 4 hereof, including
                           decisions with respect to capital expenditures and
                           the exercise of rights and privileges as owner or
                           part owner of such assets;

                  (c)      dealing with existing public and non-public debt
                           obligations of the Target and its status as a
                           Canadian public company;

                  (d)      dealing with management and employee issues and
                           managing the Target's pension fund; and

                  (e)      banking, cash management and funding requirements.

         3.1.4    Notwithstanding that the New Board will have ultimate
                  responsibility for the Transitional Issues, day-to-day
                  management during the Transitional Period shall be conducted
                  by a small team comprised of an equal number of nominees of C
                  and N.

         3.1.5    Each of the parties acknowledges and agrees that for so long
                  as the Target remains a public company, it will use its best
                  efforts to ensure that the Target complies with all applicable
                  public company reporting, filing and other similar
                  requirements.


                                   ARTICLE IV


                             PERMANENT ARRANGEMENTS
                             ----------------------

4.1      ACKNOWLEDGED INTENTIONS
         -----------------------

         4.1.1    C and N acknowledge and agree that they shall proceed to
                  implement the permanent arrangements set forth herein in a
                  manner which maximises the long-term benefits to both C and N
                  of their ownership of the assets of the Target.

         4.1.2    The parties shall consult with each other regarding, and
                  complete, the restructuring of the ownership of the Target's
                  assets contemplated by this Article IV so as to minimize
                  costs, including taxes, to C and N wherever possible and to
                  maximize the amount of financing that each party can obtain,
                  at its option, at the level of its assets of the Target.
                  Without limiting the generality of the foregoing,


<PAGE>   22
                                      -9-


                  it is the express intention of the parties, and N will
                  endeavor to ensure, that C's interest in the non-Canadian
                  assets of the Target may be held outside of Canada.

4.2      TRANSFER OF INITIAL INTERESTS IN TARGET'S ASSETS TO C
         -----------------------------------------------------

         4.2.1    Immediately following and on the same day as the amalgamation
                  of the Target with N (which amalgamation shall occur as
                  expeditiously as possible but in no event later than the
                  ninetieth (90th) day following the completion of the Bid,
                  unless the parties otherwise agree), N shall effect such
                  transfers to C (or at C's option, one or more of its
                  subsidiaries) resulting in C (or such subsidiary or
                  subsidiaries) owning the interests in each of the assets of
                  the Target identified in Schedule I and one-half of all other
                  assets of the Target (including tax benefits), except for the
                  assets set forth in Schedule V (the "Initially Excluded
                  Assets"), together with the equivalent percentage of all
                  liabilities associated with such transferred assets. The total
                  purchase price for the interests in such assets shall be equal
                  to (a) one-half of the value of the then-outstanding public
                  debt of the Target to be assumed by N in connection with the
                  amalgamation as set forth on Schedule VI (the "Debt Amount")
                  PLUS (b) the aggregate amount outstanding under the Advances
                  In consideration of, and subject to, the completion of the
                  transfers contemplated by the first sentence of this section
                  4.2.1, (I) C shall pay to N the Canadian dollar amount equal
                  to the Debt Amount and (II) the parties shall set off off
                  outstanding amount of the Advances against the balance of the
                  purchase price. The parties shall agree on the allocation of
                  the purchase price among the transferred assets.

         4.2.2    Notwithstanding the foregoing, N shall not be permitted to
                  consummate the amalgamation of the Target with N, and C shall
                  not be obligated to release the Pledge, unless and until C
                  shall be satisfied (in its sole discretion) that the transfers
                  contemplated by section 4.2.1 will occur immediately following
                  and on the same day as the amalgamation.

         4.2.3    The parties acknowledge and agree that they shall, prior to
                  the amalgamation of the Target with N, enter into a
                  shareholders' agreement as owners of interests in the Target's
                  assets (or, if the parties so determine or if necessary to
                  implement the terms of such agreement, separate shareholders'
                  agreements or other arrangements for each asset), the
                  principal terms of which are set forth in Schedule VII (the
                  "Shareholders' Agreement"). The parties shall as soon as
                  possible following the date of this Agreement, and subject to
                  Article V hereof, share with one another all information,
                  whether or not confidential, in such party's possession with
                  regard to any assets of the Target to be transferred
                  hereunder.


<PAGE>   23
                                      -10-


4.3      TRANSFER OF INITIALLY EXCLUDED ASSETS
         -------------------------------------

         4.3.1    The parties shall cooperate and use their reasonable best
                  efforts to ensure that, as soon as practicable following the
                  amalgamation of the Target with N, N shall effect such
                  transfers to C (or, at C's option, one or more of its
                  subsidiaries) resulting in C (or such subsidiary or
                  subsidiaries) owning one-half of the Target's interest in each
                  of the Initially Excluded Assets. To the extent that the
                  Target's interest in an Initially Excluded Assets is held in a
                  special purpose vehicle organized outside of Canada, N shall
                  continue to hold such asset in such special purpose vehicle
                  and N will endeavor to transfer 50% of its interest in such
                  special purpose vehicle to C. If N is permitted to and does
                  transfer to C (or at C's option, such subsidiary or
                  subsidiaries) (a) one-half of the Target's interest in the
                  Antamina project within two years following the date of the
                  amalgamation of the Target with N (the "Amalgamation Date"),
                  then C shall transfer to N a 20% interest in Compania Minera
                  Cerro Colorado Limitada (the "Cerro Colorado project"), (b)
                  one-half of the Target's interest in Minera Alumbrera Limited
                  (the "Alumbrera project") within 180 days following the
                  Amalgamation Date, then C shall transfer to N a 5% interest in
                  the Cerro Colorado project and (c) one-half of the Target's
                  interest in Highland Valley Copper (the "Highland Valley
                  project") within 180 days following the Amalgamation Date,
                  then C shall transfer to N a 7% interest in the Cerro Colorado
                  project. Such assets shall be transferred, to C and to N, in
                  the manner described in section 4.3.4.

         4.3.2    If on the 181st day following the Amalgamation Date, N has not
                  transferred to C or its subsidiaries (or such transfer would
                  result in C or its subsidiaries having a diminution in voting
                  or other rights in such interest) (a) one-half of the Target's
                  interest in the Alumbrera project or (b) one-half of the
                  Target's interest in the Highland Valley project, then N shall
                  sell, in a manner acceptable to C, 100% of the Target's
                  interest in such asset or assets in a BONA FIDE, arms'-length
                  transaction for cash at the highest price offered at such
                  time. Upon receipt by C (or, at its option, one of its
                  subsidiaries) of 50% of the net proceeds of such sale, C shall
                  transfer to N, in the manner described in section 4.3.4, (i)
                  in the case of the Target's interest in the Alumbrera project,
                  a 5% interest in the Cerro Colorado project and (ii) in the
                  case of the Target's interest in the Highland Valley project,
                  a 7% interest in the Cerro Colorado project.

         4.3.3    If prior to the second anniversary of the Amalgamation Date, N
                  has not transferred to C or its subsidiaries one-half of the
                  Target's interest in the Antamina project, then the parties
                  shall have no further obligations to one another with respect
                  to the Antamina project pursuant to this section 4; provided
                  that if N has been unable to transfer to C one-half of the
                  Target's interest in the Antamina project solely as a result
                  of restrictions placed by the Government of Peru on the
                  ownership of the Antamina project, then N shall have the
                  option, exercisable only


<PAGE>   24
                                      -11-


                  during the 30-day period following the second anniversary of
                  the Amalgamation Date, to acquire from C, in the manner
                  described in section 4.3.4, a 20% interest in the Cerro
                  Colorado project for an all-cash Canadian dollar purchase
                  price equal to [confidential treatment requested] of the
                  sum of (x) the total equity value (on a fully diluted basis
                  taking into account all outstanding options on the Shares of
                  the Target) based on the Acquisition Cost of the Shares and
                  (y) Cdn.$800 million.

         4.3.4    The transfer of an interest in an Initially Excluded Asset by
                  N to C or one of its subsidiaries, and the transfer of any
                  interest in the Cerro Colorado project by C to N, shall be
                  made pursuant to an instrument or instruments of transfer
                  reflecting the terms and conditions set forth in this
                  Agreement and other customary terms. Prior to such transfer,
                  the parties shall amend the Shareholders' Agreement to include
                  such Initially Excluded Asset or shall enter into a separate
                  shareholders' agreement for such Initially Excluded Asset with
                  the same terms as the Shareholders' Agreement. The interests
                  in such assets shall be transferred with the equivalent
                  percentage of all associated liabilities. On the date of any
                  such transfer, the transferee shall reimburse the transferor
                  for the U.S. dollar equivalent amount of the sum of all cash
                  capital contributions and investments made in respect of the
                  interest being transferred (with each such contribution and
                  investment converted into U.S. dollars at the exchange rate in
                  effect at the time of such contribution or investment) from
                  the Amalgamation Date through the transfer date plus interest
                  on any such amounts accruing at a rate per annum equal to
                  three-month LIBOR plus 2.0% (reset and compounded quarterly on
                  the first business day of each calendar quarter), and the
                  transferor shall account to the transferee for the U.S. dollar
                  equivalent amount of any amount of cash received (after
                  deduction of all allocable taxes and expenses) by the
                  transferor (with each such amount converted into U.S. dollars
                  at the exchange rate in effect at the time of the receipt of
                  such cash) as a result of owning such interest prior to the
                  transfer date plus interest on any such amounts accruing at a
                  rate per annum equal to three-month LIBOR plus 2.0% (reset and
                  compounded quarterly on the first business day of each
                  calendar quarter). For greater clarity, upon the transfer of
                  any interest in accordance with this section 4.3, the parties
                  shall endeavor to place one another in the same economic
                  position with respect to such interest as if the transferee
                  had owned, and the transferor had not owned, such interest
                  from the Amalgamation Date through the transfer date.

         4.3.5    For so long as transfers are contemplated under this Article
                  IV but have not occurred, (a) the parties shall keep each
                  other fully informed regarding the Cerro Colorado project and
                  the projects relating to the Initially Excluded Assets and (b)
                  N shall not take any action, and C shall not take any action
                  with respect to the Cerro Colorado project, that would have an
                  adverse effect on the rights, interests, obligations or
                  liabilities of the other party with respect to any such
                  project upon


<PAGE>   25
                                      -12-


                  completion of such transfer. In addition, prior to the
                  transfer of an interest in the Antamina project, N shall have
                  complied with the provisions set forth under "Voting and Other
                  Rights in Antamina" in Schedule VII hereto.

4.4      INDEMNITY
         ---------

         4.4.1    The parties acknowledge and agree that, except as otherwise
                  set forth herein, each of them is responsible for 50% of the
                  obligations and liabilities of the Target and further agree
                  that they shall, prior to the completion of the Bid, enter
                  into an indemnity agreement to further evidence such
                  responsibility which, for greater certainty, shall include all
                  expenses, losses, costs, claims, actions, damages, penalties
                  or liabilities incurred by N or C, as the case may be,
                  including taxes, as a result of:

                  (i)      the Amalgamation and the assumption by N, as a matter
                           of law, of all liabilities and obligations of the
                           Target;

                  (ii)     the ownership by N of the Target, the security
                           interest held by C in Shares of the Target and the
                           exercise by C and N of rights with respect to the
                           voting of Shares in and appointment of directors of
                           the Target commencing upon completion of the Bid
                           through the amalgamation of the Target with N; and

                  (iii)    any breach by the other party of this Agreement or
                           any other agreement or instrument entered into by the
                           parties in connection herewith.

                  Notwithstanding the foregoing, the aforementioned indemnity
                  agreement shall not include indemnification for: (A) any
                  expenses that are to be borne by each party under section 2.6
                  hereof, (B) any obligations and liabilities in respect of the
                  debt instruments set forth on Schedule VI hereto, (C) any
                  liabilities and obligations associated with any of the assets
                  set forth in Schedules I and V hereto.

         4.4.2    The indemnity agreement to be entered into by the parties
                  shall provide, among other things, for (a) an exclusion for
                  liabilities and/or obligations if and to the extent that such
                  liabilities and/or obligations arose as a result of a failure
                  by the indemnified party to comply with this Agreement or any
                  of the other agreements entered into by the parties in
                  connection herewith or a failure by it to use reasonable best
                  efforts to avoid or otherwise mitigate the loss resulting from
                  any such liabilities or obligations, (b) indemnification
                  obligations to be net of any insurance or other third party
                  recoveries, (c) requirements for reasonably detailed and
                  prompt disclosure of claims, (d) a process providing for joint
                  control of the defense and settlement of third party claims
                  and an obligation of the parties to cooperate and share
                  information in respect of the defense of any claim, (e)
                  interest


<PAGE>   26
                                      -13-


                  on amounts owing to an indemnified party, (f) a right of
                  set-off between the parties, (g) sharing of tax or other
                  refunds or recoveries with respect to any indemnified amount,
                  and (h) a right of subrogation by the indemnifying party in
                  respect of any third-party claims relating to the indemnified
                  liability.

         4.4.3    Liabilities and obligations associated with assets of the
                  Target which are transferred to C pursuant to the terms of
                  Article IV shall be governed from the time of such transfer by
                  the terms of the documentation effecting such transfer.
                  Liabilities and obligations associated with assets that remain
                  the property of N shall remain liabilities and obligations of
                  N, and shall not be subject to any indemnity by C.


                                    ARTICLE V


                                 CONFIDENTIALITY
                                 ---------------

5.1      GENERAL
         -------

         The parties acknowledge that each party has provided and may provide
the other party with access to information, plans, proposals, reports, data and
materials ("Information") relating to such party and its affairs (collectively
"Confidential Information"). The term "Confidential Information" does not
include Information which: (i) was already in the possession of either party or
its advisors prior to its disclosure pursuant to this Agreement, (ii) becomes
generally available to the public other than as a result of a disclosure by the
relevant party or its directors, officers, employees or agents or (iii) becomes
available to such party on a non-confidential basis from a source other than the
other party. Each party agrees that, except as otherwise specifically provided
herein, it shall keep all Confidential Information provided to it by the other
party strictly confidential and shall not disclose such Confidential Information
to any person other than such of its directors, officers, employees and agents
as require such Confidential Information in connection with the transactions
contemplated by this Agreement. Each party shall take all reasonable steps to
minimize the risk of disclosure of the Confidential Information, by ensuring
that:

                  (a)      it restricts access to the Confidential Information
                           to those persons in its organization who are
                           essential to the implementation of the transactions
                           contemplated by this Agreement, and instructing and
                           requiring such person to keep the Confidential
                           Information confidential;

                  (b)      it provides proper and secure storage for written
                           Confidential Information; and


<PAGE>   27
                                      -14-


                  (c)      it does not make, permit or cause to be made
                           unnecessary copies of the Confidential Information.

5.2      RETURN OF INFORMATION
         ---------------------

         Upon the termination of this Agreement, Confidential Information
disclosed by one party to the other shall be returned to it immediately upon
request.

5.3      DISCLOSURE REQUIRED BY LAW
         --------------------------

         Notwithstanding anything contained herein, either party may disclose
any Confidential Information if, in the opinion of the disclosing party's legal
counsel:

                  (a)      such disclosure is legally required to be made in a
                           judicial, administrative or governmental proceeding,
                           or

                  (b)      such disclosure is legally required to be made
                           pursuant to the rules or regulations of a securities
                           commission, stock exchange or similar authority
                           applicable to the disclosing party, including in
                           connection with a bid by the disclosing party for the
                           Target.

         Prior to any disclosure of Confidential Information under this Section,
the disclosing party shall, except in the case of a bid by the disclosing party
for the Target, give the other party at least 10 (ten) days' prior written
notice (unless less time is permitted for disclosure by such rules, regulations
or proceedings) and, in making such disclosure, the disclosing party shall
disclose only that portion of the Confidential Information required to be
disclosed and shall take all reasonable steps to preserve the confidentiality
thereof, including, without limitation, obtaining protective orders and
supporting the other party in intervention in any such proceeding.


                                   ARTICLE VI


                         REPRESENTATIONS AND WARRANTIES
                         ------------------------------

6.1      REPRESENTATIONS AND WARRANTIES OF N
         -----------------------------------

         6.1.1    N has been duly incorporated and is validly existing as a
                  corporation in good standing under the laws of the Province of
                  Ontario, and has full corporate power and authority to own,
                  lease and operate its assets, properties and business and to
                  carry on its business as now being and as heretofore
                  conducted.

         6.1.2    N has all requisite corporate power and authority to enter
                  into and perform all of its obligations hereunder, and N is
                  duly authorized to execute, deliver and perform


<PAGE>   28
                                      -15-


                  this Agreement; this Agreement has been duly executed by N, is
                  a valid and binding agreement of N, and is enforceable against
                  N in accordance with its terms, except as such enforceability
                  may be limited by bankruptcy, insolvency, receivership or
                  other similar laws applicable to creditors' rights and other
                  equitable remedies.

         6.1.3    The execution, delivery and performance by N of this Agreement
                  do not violate or conflict with or result in a breach of or
                  constitute (or with notice or lapse of time or both would
                  constitute) a default under (i) N's constituent documents,
                  (ii) any indenture, mortgage, bond, license, lease, permit,
                  loan agreement or other agreement to which N is a party or by
                  which N or any of its subsidiaries or properties is bound or
                  (iii) any law, rule, regulation, judgment, decree or order of
                  any court applicable to or affecting the business or
                  operations of N or any of its subsidiaries.

         6.1.4    As of the date of this Agreement, N is the beneficial owner of
                  Shares representing 8.9% of the total outstanding Shares of
                  the Target. The average purchase price for all such Shares by
                  N was not less than the purchase price per Share in the Bid as
                  set forth in section 2.1.1.

         6.1.5    Except for Trilon Securities Corporation and CIBC World
                  Markets, whose fees shall be paid by N, no broker, finder or
                  investment or commercial banker is or will be entitled to any
                  broker's or finder's or similar fee or commission in
                  connection with the Bid or the transactions contemplated by
                  this Agreement from N.

         6.1.6    N has financing (excluding obligations of C under this
                  Agreement) sufficient to fund one-half of the sum of the
                  Acquisition Costs of Shares to be acquired in the Bid and in
                  any Follow-up Transaction, and has obtained from Trilon
                  Financial Corporation a financing commitment for such purpose.
                  N has provided to C a true and complete copy of such financing
                  commitment, such financing commitment remains in full force
                  and effect and N has no reason to believe that the conditions
                  to such financing commitment will not be satisfied.

6.2      REPRESENTATIONS AND WARRANTIES OF C
         -----------------------------------

         6.2.1    C has been duly incorporated and is validly existing as a
                  corporation under the laws of Chile, and has full corporate
                  power and authority to own, lease and operate its assets,
                  properties and business and to carry on its business as now
                  being and as heretofore conducted.

         6.2.2    C has all requisite corporate power and authority to enter
                  into and perform all of its obligations hereunder, and C is
                  duly authorized to execute, deliver and perform


<PAGE>   29
                                      -16-


                  this Agreement; this Agreement has been duly executed by C, is
                  a valid and binding agreement of C, and is enforceable against
                  C in accordance with its terms, except as such enforceability
                  may be limited by bankruptcy, insolvency, receivership or
                  other similar laws applicable to creditors' rights and other
                  equitable remedies.

         6.2.3    The execution, delivery and performance by C of this Agreement
                  do not violate or conflict with or result in a breach of or
                  constitute (or with notice or lapse of time or both would
                  constitute) a default under (i) C's constituent documents,
                  (ii) any indenture, mortgage, bond, license, lease, permit,
                  loan agreement or other agreement to which C is a party or by
                  which C or any of its subsidiaries or properties is bound or
                  (iii) any law, rule, regulation, judgment, decree or order of
                  any court applicable to or affecting the business or
                  operations of C or any of its subsidiaries.

         6.2.4    As of the date of this Agreement, C does not own any Shares of
                  the Target.

         6.2.5    Except for Morgan Stanley Dean Witter, whose fees shall be
                  paid by C, no broker, finder or investment or commercial
                  banker is or will be entitled to any broker's or finder's or
                  similar fee or commission in connection with the Bid or the
                  transactions contemplated by this Agreement from C.

         6.2.6    C has financing sufficient to fund its obligations under this
                  Agreement, and has obtained from Morgan Stanley Senior
                  Funding, Inc. a financing commitment for such purpose. C has
                  provided to N a true and complete copy of such financing
                  commitment, such financing commitment remains in full force
                  and effect and C has no reason to believe that the conditions
                  to such financing commitment will not be satisfied.


                                   ARTICLE VII


                               GENERAL PROVISIONS
                               ------------------

7.1      TERM OF AGREEMENT
         -----------------

         Subject to earlier termination pursuant to subsections 2.7, 2.8 or
2.10, this Agreement shall continue until the transactions contemplated herein
have been consummated. Upon a termination of this Agreement, the parties shall
cease to have any obligations or liabilities hereunder other than (a) any
obligations or liabilities that arose as a result of a breach of this Agreement
prior to or in connection with the termination and (b) any obligations under
Article V, Section 2.6 and Section 2.9 hereof.


<PAGE>   30
                                      -17-


7.2      NO PARTNERSHIP OR AGENCY
         ------------------------

         Nothing in this Agreement shall be deemed in any way or for any purpose
to constitute either party to this Agreement a partner or agent of the other
party.

7.3      ENTIRE AGREEMENT
         ----------------

         This Agreement constitutes the entire agreement between the parties
pertaining to the subject matter hereof and replaces all prior agreements,
understandings, negotiations and discussions, whether oral or written, of the
parties pertaining thereto. There are no conditions, representations, warranties
or other agreements between the parties in connection with the subject matter of
this Agreement, whether oral or written, express or implied, statutory or
otherwise, except as specifically set out in this Agreement.

7.4      AMENDMENT AND WAIVER
         --------------------

         This Agreement may be amended or supplemented from time to time by
instrument in writing executed by both parties. Any waiver of a default by
either party to this Agreement in the observance or the performance of any part
of this Agreement must be in writing and shall not extend to or be taken in any
manner to affect any other default.

7.5      DELIVERY OF DOCUMENTS AND NOTICE
         --------------------------------

         Any notice, request, demand and other communication under this
Agreement must be in writing and be furnished, given or delivered, by way of
personal delivery (including courier) or fax to the other party at its address
or fax number set out below:

         To Napa Inc.

                  181 Bay Street, Suite 4100
                  PO Box 755, BCE Place
                  Toronto, Ontario
                  Canada M5J 2T3

                  Attention: Aaron Regent
                  Fax No:    001 416 982 7490
<PAGE>   31
                                      -18-


         To Cabernet

                  Huerfanos 1270 Floor 6
                  P.O. Box 150-D
                  Santiago, Chile

                  Attention:  Mario Espinoza Duran
                  Fax No:     011 56 2 690 3289

         Any notice or other communication so given shall be deemed to have been
given and received on the day of delivery if delivered, or on the day of faxing,
provided that such day is a business day in the place of receipt and such notice
or other communication is so delivered, faxed or sent before 4:30 p.m. (local
time) on such day. Otherwise, such notice or communication shall be deemed to
have been given and received on the next following business day. Any such notice
or other communication given in any other manner shall be deemed to have been
given and received only upon actual receipt. Either party may from time to time
change its address under this section by notice to the other party given in the
manner provided by this section.

7.6      TIME OF ESSENCE
         ---------------

         Time shall be of the essence of this Agreement in all respects.

7.7      SEVERABILITY
         ------------

         If one or more of the provisions of this Agreement are determined to be
invalid, illegal or unenforceable in any respect under any law, the validity,
legality or enforceability of the remaining provisions of this Agreement shall
not be affected or impaired. Each provision of this Agreement is declared to be
separate and distinct.

7.8      GOVERNING LAW
         -------------

         This Agreement is governed by the laws of the Province of Ontario and
the laws of Canada applicable therein. Each party attorns to the nonexclusive
jurisdiction of the courts of the Province of Ontario in connection with the
enforcement of this Agreement.

7.9      FURTHER ASSURANCES
         ------------------

         Each party shall from time to time take any and all steps, and execute,
acknowledge and deliver any other and further deeds, documents, instruments and
assurances as may be necessary to give full force and effect to the purpose and
intent of this Agreement.


<PAGE>   32
                                      -19-


7.10     NO ASSIGNMENT
         -------------

         Except as otherwise expressly provided herein, this Agreement
(including any interest in this Agreement) and the rights of any party to this
Agreement may not be assigned or made the subject of any trust in favour of any
person without the prior written consent of all other parties hereto.

7.11     INUREMENT
         ---------

         This Agreement shall inure to the benefit of the parties to this
Agreement and their respective successors and permitted assigns. Nothing in this
Agreement, express or implied, is intended to or shall confer upon any other
person any rights, benefits or remedies of any nature whatsoever under or by
reason of this Agreement.

7.12     EXECUTION IN COUNTERPARTS
         -------------------------

         This Agreement may be executed in one or more counterparts, each of
which shall be deemed to be an original and all of which taken together shall be
deemed to constitute one and the same Agreement executed either in original or
faxed form and the parties adopt any signatures by a receiving fax machine as
original signatures of the parties; provided, however, that any party providing
its signature in such manner shall promptly forward to the other parties an
original of the signed copy of this Agreement which was so faxed.

7.13     SPECIFIC PERFORMANCE
         --------------------

         The parties hereto acknowledge and agree that irreparable damage would
occur and that the parties hereto would not have an adequate remedy at law in
the event that any of the provisions of this Agreement were not performed in
accordance with their specifications or otherwise breached. It is accordingly
agreed that the parties shall be entitled to, and each hereby consents to, the
entry of an injunction or injunctions to prevent breaches of the provisions of
this Agreement and to enforce specifically the terms and provisions hereof in
any court having jurisdiction, this being in addition to any other remedy to
which they may be entitled at law or in equity.

7.14     RIGHTS OF SET-OFF AND COUNTERCLAIM
         ----------------------------------

         All payments to be made by one party to another under this Agreement or
any other agreement contemplated herein to be executed by the parties may be
made subject to a right of set-off or counterclaim for any amounts owing by the
other party to such party under this Agreement or any other such agreement.

<PAGE>   33




         IN WITNESS whereof the parties to this Agreement have executed this
Agreement by their duly authorized officers in that behalf, as of the date first
written above.

                                             NORANDA INC.

                                             By:  _____________________________

                                             Name:  ___________________________

                                             Title:  __________________________

                                             CORPORACION NACIONAL DEL
                                             COBRE DE CHILE

                                             By:  _____________________________

                                             Name:  ___________________________

                                             Title:  __________________________






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