MAGMA COPPER CO
SC 13D/A, 1995-12-05
PRIMARY SMELTING & REFINING OF NONFERROUS METALS
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                        SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C.  20549


                                   SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                                (Amendment No. 12)

                               Magma Copper Company  
                                 (Name of Issuer)


                                   Common Stock         
                          (Title of Class of Securities)


                                    559177 20 9  
                                  (CUSIP Number)



                               Andrew R. Brownstein
                        c/o Wachtell, Lipton, Rosen & Katz
                               51 West 52nd Street
                               New York, NY  10019
                                  (212) 403-1000
                                                                     
          (Name, address and telephone number of person authorized
                      to receive notices and communications)


                               November 30, 1995                      
            (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 which is the subject
         of this Schedule 13D, and is filing this schedule because of
         Rule 13d-1(b) (3) or (4), check the following box:    

         Check the following box if a fee is being paid with this
         statement:     <PAGE>
         CUSIP NO. 559177 20 9                 


                                                                      
         1.   Name of Reporting Person
              S.S. or I.R.S. Identification No. of Above Person

              Warburg, Pincus Capital Company, L.P.   06-1183391
                                                                      
         2.   Check the Appropriate Box if a Member of a Group
                                                         (a)     
                                                         (b)   X 
                                                                      
         3.   SEC Use Only

                                                                      
         4.   Source of Funds

              00
                                                                      
         5.   Check Box if Disclosure of Legal Proceedings is Required
              Pursuant to Items 2(d) or 2(e)
                                                             
                                                                      
         6.   Citizenship or Place of Organization

              Delaware
                                                                     
         Number of           7.   Sole Voting Power
         Shares                                               
         Beneficially        8.   Shared Voting Power
         Owned by                     16,899,616* Common    
         Each Reporting      9.   Sole Dispositive Power
         Person With                                          
                             10.  Shared Dispositive Power
                                      16,899,616* Common    

         * Subject to the restrictions previously described in Item 4
         of Schedule 13D.  See also Item 5.
                                                                     
         11.  Aggregate Amount Beneficially Owned by Each Reporting
              Person:  16,899,616
                       Common
                                                     See Item 5
                                                                     
         12.  Check if the Aggregate Amount in Row (11) Excludes Cer-
              tain Shares
                                                             
                                                                     
         13.  Percent of Class Represented by Amount in Row (11)

              35.8%     See Item 5
                                                                     
         14.  Type of Reporting Person

              PN
                                                                     <PAGE>
         CUSIP NO. 559177 20 9                 


                                                                      
         1.   Name of Reporting Person
              S.S. or I.R.S. Identification No. of Above Person

              E.M. Warburg, Pincus & Co., Inc.     13-2649089
                                                                      
         2.   Check the Appropriate Box if a Member of a Group
                                                         (a)     
                                                         (b)   X 
                                                                      
         3.   SEC Use Only

                                                                      
         4.   Source of Funds

              Not applicable
                                                                      
         5.   Check Box if Disclosure of Legal Proceedings is Required
              Pursuant to Items 2(d) or 2(e)
                                                             
                                                                      
         6.   Citizenship or Place of Organization

              Delaware
                                                                     
         Number of           7.   Sole Voting Power
         Shares                                              
         Beneficially        8.   Shared Voting Power
         Owned by                    16,899,616* Common   
         Each Reporting      9.   Sole Dispositive Power
         Person With                                         
                             10.  Shared Dispositive Power
                                     16,899,616* Common    
                                                                     
         11.  Aggregate Amount Beneficially Owned by Each Reporting
              Person:  16,899,616
                       Common
                                                     See Item 5
                                                                     
         12.  Check if the Aggregate Amount in Row (11) Excludes Cer-
              tain Shares
                                                             
                                                                     
         13.  Percent of Class Represented by Amount in Row (11)

              35.8%     See Item 5
                                                                     
         14.  Type of Reporting Person

              CO
                                                                     <PAGE>
         CUSIP NO. 559177 20 9                 


                                                                      
         1.   Name of Reporting Person
              S.S. or I.R.S. Identification No. of Above Person

              Warburg, Pincus Ventures, Inc.   13-3040492
                                                                      
         2.   Check the Appropriate Box if a Member of a Group
                                                         (a)     
                                                         (b)   X 
                                                                      
         3.   SEC Use Only

                                                                      
         4.   Source of Funds

              Not applicable
                                                                      
         5.   Check Box if Disclosure of Legal Proceedings is Required
              Pursuant to Items 2(d) or 2(e)
                                                             
                                                                      
         6.   Citizenship or Place of Organization

              Delaware
                                                                     
         Number of           7.   Sole Voting Power
         Shares                                            
         Beneficially        8.   Shared Voting Power
         Owned by                    16,899,616* Common  
         Each Reporting      9.   Sole Dispositive Power
         Person With                                       
                             10.  Shared Dispositive Power
                                     16,899,616* Common  

         * Subject to the restrictions previously described in item 4
         of Schedule 13D.  See also Item 5.
                                                                     
         11.  Aggregate Amount Beneficially Owned by Each Reporting
              Person:  16,899,616
                       Common
                                                     See Item 5
                                                                     
         12.  Check if the Aggregate Amount in Row (11) Excludes Cer-
              tain Shares
                                                             
                                                                     
         13.  Percent of Class Represented by Amount in Row (11)

              35.8%      See Item 5
                                                                     
         14.  Type of Reporting Person

              CO
                                                                     <PAGE>
         CUSIP NO. 559177 20 9                 


                                                                      
         1.   Name of Reporting Person
              S.S. or I.R.S. Identification No. of Above Person

              Warburg, Pincus & Co.    13-6358475

                                                                      
         2.   Check the Appropriate Box if a Member of a Group
                                                         (a)     
                                                         (b)   X 

                                                                      
         3.   SEC Use Only

                                                                      
         4.   Source of Funds

              Not applicable
                                                                      
         5.   Check Box if Disclosure of Legal Proceedings is Required
              Pursuant to Items 2(d) or 2(e)
                                                             
                                                                      
         6.   Citizenship or Place of Organization

              Delaware
                                                                     
         Number of           7.   Sole Voting Power
         Shares                                            
         Beneficially        8.   Shared Voting Power
         Owned by                    16,899,616* Common  
         Each Reporting      9.   Sole Dispositive Power
         Person With                                       
                             10.  Shared Dispositive Power
                                     16,899,616* Common  

         * Subject to the restrictions previously described in item 4
         of Schedule 13D.  See also Item 5.
                                                                     
         11.  Aggregate Amount Beneficially Owned by Each Reporting
              Person:  16,899,616
                       Common
                                                     See Item 5
                                                                     
         12.  Check if the Aggregate Amount in Row (11) Excludes Cer-
              tain Shares
                                                             
                                                                     
         13.  Percent of Class Represented by Amount in Row (11)

              35.8%      See Item 5
                                                                     
         14.  Type of Reporting Person

              CO
                                                                     <PAGE>







                               AMENDMENT NO. 12 TO

                                   SCHEDULE 13D

                         RELATING TO THE COMMON STOCK OF

                               MAGMA COPPER COMPANY


                   This statement constitutes Amendment No. 12 to the
         Schedule 13D filed December 1, 1988, as amended December 30,
         1988, December 10, 1990, December 18, 1991, December 20, 1992,
         December 29, 1992, March 3, 1994, March 10, 1994, May 11, 1994,
         May 18, 1994, May 31, 1994 and June 10, 1994 by Warburg, Pincus
         Capital Company, L.P. ("WPCC"), a Delaware limited partnership,
         E.M. Warburg, Pincus & Co., Inc., a Delaware corporation, War-
         burg, Pincus Ventures, Inc., a Delaware corporation, and War-
         burg, Pincus & Co., a New York partnership, in connection with
         the ownership of common stock, par value $.01 (the "Common
         Stock"), of Magma Copper Company, a Delaware corporation (here-
         inafter referred to as the "Company").  

         Item 4.   Purpose of the Transaction, is hereby amended by add-
                   ing the following thereto:

                   After the close of business on November 30, 1995, the
         Company entered into an Agreement and Plan of Merger (the
         "Merger Agreement") with The Broken Hill Proprietary Company
         Limited, a Victoria, Australia corporation ("Parent"), BHP
         Holdings (USA) Inc., a subsidiary of Parent ("BHP") and BHP Sub
         Inc., a subsidiary of BHP ("Purchaser").  Pursuant to the
         Merger Agreement, and subject to the terms and conditions
         thereof, Purchaser has agreed to make a offer (the "Offer") to
         purchase all of the Company's outstanding Common Stock at a
         price of not less than U.S. $28.00 per share, to be followed by
         the merger (the "Merger") of Purchaser with and into the
         Company.  The Merger Agreement will be filed by the Company
         with the Securities and Exchange Commission on or about
         December 5, 1995 as an exhibit to the Company's Solicitation/
         Recommendation Statement on a Schedule 14D-9.  

                   Concurrently with the execution by the Company of the
         Merger Agreement, WPCC entered into a Tender Agreement (the
         "Tender Agreement") with Parent, pursuant to which WPCC agreed
         to tender pursuant to the Offer all of the shares of Common
         Stock owned (or subsequently acquired) by WPCC, and to vote
         such shares (i) in favor of the Merger, (ii) against any action
         or agreement that would result in a material breach under the
         Merger Agreement and (iii) against any action or agreement<PAGE>







         (other than the Merger Agreement and the transactions contem-
         plated thereby) that is intended or could reasonably be ex-
         pected to impede, interfere with, delay, postpone or attempt to
         discourage the Merger or the Offer.

                   The Tender Agreement and WPCC's obligation to tender
         and vote the shares covered thereby expires on the earliest of
         (i) the effective time of the Merger, (ii) termination of the
         Merger Agreement in accordance with its terms, (iii) the with-
         drawal by the Company's Board of Directors of its approval or
         recommendation of the Offer or the Merger, (iv) the modifica-
         tion by the Company's Board of Directors of its approval of the
         Offer or the Merger in a manner adverse to Parent and (v) writ-
         ten notice of termination of the Tender Agreement by Parent to
         WPCC.

                   Pursuant to the Tender Agreement, WPCC has also
         agreed, among other things, not to transfer, pledge, grant
         proxies or effect similar transactions involving the shares of
         Common Stock owned by it, and not to solicit, encourage or take
         an other action to facilitate inquiries or proposals which
         could lead to a takeover proposal by a third party involving
         the Company.

                   The foregoing description of the Tender Agreement is
         qualified in its entirety by reference to the Tender Agreement,
         which is attached hereto as Exhibit 14 and is incorporated
         herein by reference.

         Item 5.   Interest in Securities of the Issuer, is hereby
                   amended by deleting the paragraph beginning "Accord-
                   ingly, WPCC now holds 16,007,143 shares..." and add-
                   ing the following thereto:

                   On November 28, 1995, Warburg exercised all of the
         892,473 warrants it held at an exercise price of $8.50 per war-
         rant, or an aggregate exercise price of $7,586,020, and upon
         such exercise received 892,473 shares of Common Stock.  Accord-
         ingly, as of November 30, 1995, WPCC held 16,889,616 shares of
         Common Stock, and no warrants to purchase Common Stock, which
         shares represent approximately 35.8% of the total outstanding
         shares of Common Stock, based upon the 46,376,384 shares of
         Common Stock reported outstanding as of the date of the
         Company's Form 10-Q for the quarterly period ended September
         30, 1995, and calculated in accordance with Rule 13d-3.  







                                       -2-<PAGE>







         Item 6.   Contracts, Arrangements, Understandings or
                   Relationships With Respect to Securities of the
                   Issuer, is hereby amended by adding the following
                   thereto:

                   On November 30, 1995, WPCC entered into the Tender
         Agreement with Parent, pursuant to which, among other things,
         WPCC agreed to tender the shares of Common Stock owned by it in
         the Offer.  See Item 4, and Exhibits 14 and 15.

         Item 7.   Material to be Filed as Exhibits, is hereby amended
                   by adding the following thereto:


                   14   Tender Agreement, dated November 30, 1995, by
                        and between WPCC and Parent.




































                                       -3-<PAGE>








                                    SIGNATURE


                   After reasonable inquiry and to the best of my knowl-
         edge and belief, I certify that the information set forth in
         this statement is true, complete and correct.

                                 WARBURG, PINCUS CAPITAL COMPANY, L.P.
                                   By:  WARBURG, PINCUS & CO.,
                                          General Partner


                                 By:   /s/ Stephen Distler               
                                    Name:  Stephen Distler
                                    Title: Partner


                                 E.M. WARBURG, PINCUS & CO., INC.


                                 By:   /s/ Stephen Distler               
                                    Name:  Stephen Distler
                                    Title: Managing Director


                                 WARBURG, PINCUS VENTURES, INC.


                                 By:   /s/ Stephen Distler                
                                    Name:  Stephen Distler
                                    Title: Managing Director


                                 WARBURG, PINCUS & CO.


                                 By:   /s/ Stephen Distler               
                                    Name:  Stephen Distler
                                    Title: Partner

         Dated:  December 4, 1995<PAGE>







                                   SCHEDULE I


                   Set forth below is the name, position and present
         principal occupation of each of the directors and executive
         officers of E.M. Warburg, Pincus & Co., Inc. ("EMW") and War-
         burg, Pincus Ventures, Inc. ("WPV") and of each of the gen-
         eral partners of Warburg, Pincus Capital Company, L.P.
         ("WPCC"), and Warburg, Pincus & Co. ("WP").  EMW, WPV, WPCC
         and WP are hereinafter collectively referred to as the "Re-
         porting Entities".  Except as otherwise indicated, the busi-
         ness address of each of such persons is 466 Lexington Avenue,
         New York, New York 10017, and each of such persons is a citi-
         zen of the United States.

                      Directors and Executive Officers of
                        E.M. Warburg, Pincus & Co., Inc.

                                          Present Principal Occupation in
                                          Addition to the Position with
                                          EMW, if any, and Positions with
         Name and Position                the Reporting Entities         


         Lionel I. Pincus, Chairman       Chairman of the Board and Chief
         of the Board and Chief           Executive Officer, WPV;
         Executive Officer                Managing Partner, WP; Managing
                                          Partner, Pincus & Co.  (See
                                          Partners of WP.)

         John L. Vogelstein, Vice         President and Director, WPV;
         Chairman of the Board            Partner, WP.
         and President

         John L. Furth, Vice              Director and Managing Director,
         Chairman of the Board            WPV; Partner, WP.

         Harold Brown,                    Managing Director, WPV;
         Senior Managing Director         Partner, WP.

         Rodman W. Moorhead III,          Managing Director, WPV;
         Senior Managing Director         Partner, WP.

         Susan Black,                     Partner, WP.
         Managing Director

         Christopher W. Brody,            Managing Director, WPV;
         Managing Director                Partner, WP.<PAGE>







         Dale C. Christensen1
         Managing Director

         Errol M. Cook                    Managing Director, WPV;
         Managing Director                Partner, WP.

         Elizabeth B. Dater               Managing Director, WPV;
         Managing Director                Partner, WP.

         Stephen Distler, Managing        Managing Director and Controller
         Director and Treasurer           WPV; Partner, WP.

         Louis G. Elson                   Managing Director, WPV;
         Managing Director                Partner, WP.

         Stuart M. Goode,                 Managing Director, WPV;
         Managing Director                Partner, WP.

         Stewart K.P. Gross,              Managing Director, WPV;
         Managing Director                Partner, WP.

         Patrick T. Hackett,              Managing Director, WPV;
         Managing Director                Partner, WP.

         Jeffrey A. Harris,               Managing Director, WPV;
         Managing Director                Partner, WP.

         Robert S. Hillas,                Managing Director, WPV;
         Managing Director                Partner, WP.

         A. Michael Hoffman,              Managing Director, WPV;
         Managing Director                Partner, WP.

         William H. Janeway,              Managing Director, WPV;
         Managing Director                Partner, WP.

         Douglas M. Karp,                 Managing Director, WPV;
         Managing Director                Partner, WP.

         Charles R. Kaye,                 Managing Director, WPV;
         Managing Director                Partner, WP.




         ____________________
         1    Citizen of Canada.<PAGE>







         Richard H. King,2
         Managing Director

         Henry Kressel,                   Managing Director, WPV;
         Managing Director                Partner, WP.

         Joseph P. Landy,                 Managing Director, WPV;
         Managing Director                Partner, WP.

         Sidney Lapidus,                  Managing Director, WPV;
         Managing Director                Partner, WP.

         Edwin F. LeGard, Jr.,            Partner, WP.
         Managing Director

         Reuben S. Leibowitz,             Managing Director, WPV;
         Managing Director                Partner, WP.

         Stephen J. Lurito,               Partner, WP.
         Managing Director

         Spencer S. Marsh III,            Partner, WP.
         Managing Director

         Edward J. McKinley,              Managing Director, WPV;
         Managing Director                Partner, WP.

         Howard H. Newman,                Managing Director, WPV;
         Managing Director                Partner, WP.

         Anthony G. Orphanos,             Partner, WP.
         Managing Director

         Judhvir Parmar,3                 Managing Director, WPV.
         Managing Director

         Eugene L. Podsiadlo              Partner, WP.
         Managing Director

         Ernest H. Pomerantz,             Managing Director, WPV;
         Managing Director                Partner, WP.


         ____________________
         2    Citizen of United Kingdom.

         3    Citizen of India.<PAGE>







         Arnold M. Reichman,              Managing Director, WPV;
         Managing Director                Partner, WP.

         Roger Reinlieb,                  Partner, WP.
         Managing Director

         Sheila N. Scott,                 Partner, WP.
         Managing Director

         Dominic H. Shorthouse,4          Managing Director, WPV.
         Managing Director

         Peter Stalker III,               Managing Director, WPV;
         Managing Director                Partner, WP.

         David A. Tanner,                 Managing Director, WPV;
         Managing Director                Partner, WP.

         James E. Thomas,                 Managing Director, WPV;
         Managing Director                Partner, WP.

         Joanne R. Wenig,                 Managing Director, WPV;
         Managing Director                Partner, WP.

         George U. Wyper                  Partner, WP.
         Managing Director



















         ____________________
         4    Citizen of United Kingdom.<PAGE>







                          Directors and Executive Officers
                          of Warburg, Pincus Ventures, Inc.


                                          Present Principal Occupation in
                                          Addition to the Position with
                                          WPV, if any, and Positions with
         Name and Position                the Reporting Entities         

         Lionel I. Pincus, Chairman       (See Directors and Executive
         of the Board and Chief           Officers of EMW.)
         Executive Officer

         John L. Vogelstein,              (See Directors and Executive
         President and Director           Officers of EMW.)

         John L. Furth, Managing          (See Directors and Executive
         Director and Director            Officers of EMW.)

         Christopher W. Brody,            (See Directors and Executive
         Managing Director                Officers of EMW.)

         Harold Brown,                    (See Directors and Executive
         Managing Director                Officers of EMW.)

         Errol M. Cook,                   (See Directors and Executive
         Managing Director                Officers of EMW.)

         Elizabeth B. Dater,              (See Directors and Executive
         Managing Director                Officers of EMW.)

         Stephen Distler, Managing        (See Directors and Executive
         Director and Treasurer           Officers of EMW.)

         Louis G. Elson                   (See Directors and Executive
         Managing Director                Officers of EMW.)

         Stuart M. Goode,                 (See Directors and Executive
         Managing Director                Officers of EMW.)

         Stewart K.P. Gross,              (See Directors and Executive
         Managing Director                Officers of EMW.)

         Patrick T. Hackett,              (See Directors and Executive
         Managing Director                Officers of EMW.)

         Jeffrey A. Harris,               (See Directors and Executive
         Managing Director                Officers of EMW.)<PAGE>







         Robert S. Hillas,                (See Directors and Executive
         Managing Director                Officers of EMW.)

         A. Michael Hoffman,              (See Directors and Executive
         Managing Director                Officers of EMW.)

         William H. Janeway,              (See Directors and Executive
         Managing Director                Officers of EMW.)

         Douglas M. Karp,                 (See Directors and Executive
         Managing Director                Officers of EMW.)

         Charles R. Kaye,                 (See Directors and Executive
         Managing Director                Officers of EMW.)

         Henry Kressel,                   (See Directors and Executive
         Managing Director                Officers of EMW.)

         Joseph P. Landy,                 (See Directors and Executive
         Managing Director                Officers of EMW.)

         Sidney Lapidus,                  (See Directors and Executive
         Managing Director                Officers of EMW.)

         Reuben S. Leibowitz,             (See Directors and Executive
         Managing Director                Officers of EMW.)

         Edward J. McKinley,              (See Directors and Executive
         Managing Director                Officers of EMW.)

         Rodman W. Moorhead III,          (See Directors and Executive
         Managing Director                Officers of EMW.)

         Howard H. Newman,                (See Directors and Executive
         Managing Director                Officers of EMW.)

         Judhvir Parmar,                  (See Directors and Executive
         Managing Director                Officers of EMW.)

         Ernest H. Pomerantz,             (See Directors and Executive
         Managing Director                Officers of EMW.)

         Arnold M. Reichman,              (See Directors and Executive
         Managing Director                Officers of EMW.)

         Dominic H. Shorthouse,           (See Directors and Executive
         Managing Director                Officers of EMW.)

         Peter Stalker III,               (See Directors and Executive
         Managing Director                Officers of EMW.)<PAGE>







         David A. Tanner,                 (See Directors and Executive
         Managing Director                Officers of EMW.)

         James E. Thomas,                 (See Directors and Executive
         Managing Director                Officers of EMW.)

         Joanne R. Wenig,                 (See Directors and Executive
         Managing Director                Officers of EMW.)<PAGE>







                      General Partners of Warburg, Pincus & Co.


                                          Present Principal Occupation in
                                          Addition to the Position with
                                          Warburg, Pincus & Co. and Posi-
         Name                             tions with the Reporting Entities

         Susan Black                      (See Directors and Executive
                                          Officers of EMW.)

         Christopher W. Brody             (See Directors and Executive
                                          Officers of EMW.)

         Harold Brown                     (See Directors and Executive
                                          Officers of EMW.)

         Errol M. Cook                    (See Directors and Executive
                                          Officers of EMW.)

         Elizabeth B. Dater               (See Directors and Executive
                                          Officers of EMW.)

         Stephen Distler                  (See Directors and Executive
                                          Officers of EMW.)

         Louis G. Elson                   (See Directors and Executive
                                          Officers of EMW.)

         John L. Furth                    (See Directors and Executive
                                          Officers of EMW.)

         Stuart M. Goode                  (See Directors and Executive
                                          Officers of EMW.)

         Stewart K.P. Gross               (See Directors and Executive
                                          Officers of EMW.)

         Patrick T. Hackett               (See Directors and Executive
                                          Officers of EMW.)

         Jeffrey A. Harris                (See Directors and Executive
                                          Officers of EMW.)

         Robert S. Hillas                 (See Directors and Executive
                                          Officers of EMW.)

         A. Michael Hoffman               (See Directors and Executive
                                          Officers of EMW.)<PAGE>







         William H. Janeway               (See Directors and Executive
                                          Officers of EMW.)

         Douglas M. Karp                  (See Directors and Executive
                                          Officers of EMW.)

         Charles R. Kaye                  (See Directors and Executive
                                          Officers of EMW.)

         Henry Kressel                    (See Directors and Executive
                                          Officers of EMW.)

         Joseph P. Landy                  (See Directors and Executive
                                          Officers of EMW.)

         Sidney Lapidus                   (See Directors and Executive Of-
                                          ficers of EMW.)

         Edwin F. LeGard, Jr.             (See Directors and Executive
                                          Officers of EMW.)

         Reuben S. Leibowitz              (See Directors and Executive
                                          Officers of EMW.)

         Stephen J. Lurito                (See Directors and Executive
                                          Officers of EMW.)

         Spencer S. Marsh III             (See Directors and Executive
                                          Officers of EMW.)

         Edward J. McKinley               (See Directors and Executive
                                          Officers of EMW.)

         Rodman W. Moorhead III           (See Directors and Executive
                                          Officers of EMW.)

         Howard H. Newman                 (See Directors and Executive
                                          Officers of EMW.)

         Anthony G. Orphanos              (See Directors and Executive
                                          Officers of EMW.)

         Lionel I. Pincus                 (See Directors and Executive
                                          Officers of EMW.)

         Eugene L. Podsiadlo              (See Directors and Executive
                                          Officers of EMW.)

         Ernest H. Pomerantz              (See Directors and Executive
                                          Officers of EMW.)<PAGE>







         Arnold M. Reichman               (See Directors and Executive
                                          Officers of EMW.)

         Roger Reinlieb                   (See Directors and Executive
                                          Officers of EMW.)

         Sheila N. Scott                  (See Directors and Executive
                                          Officers of EMW.)

         Peter Stalker III                (See Directors and Executive
                                          Officers of EMW.)

         David A. Tanner                  (See Directors and Executive
                                          Officers of EMW.)

         James E. Thomas                  (See Directors and Executive
                                          Officers of EMW.)

         John L. Vogelstein               (See Directors and Executive
                                          Officers of EMW.)

         Joanne R. Wenig                  (See Directors and Executive
                                          Officers of EMW.)

         George U. Wyper                  (See Directors and Executive
                                          Officers of EMW.)

         Pincus & Co.*

         NL & Co.*


                                 General Partner of
                        Warburg, Pincus Capital Company, L.P.

         Warburg, Pincus & Co.            (See General Partners of WP.)







         ____________________
         *    New York limited partnership; primary activity is owner-
              ship of partnership interest in WP.<PAGE>







                                Index to Exhibits


         Exhibit        Description

           14           Tender Agreement, dated November 30, 1995, by
                        and between Warburg Pincus Capital Company, L.P.
                        and The Broken Hill Proprietary Company Limited.








                                TENDER AGREEMENT

                   TENDER AGREEMENT (this "Agreement"), dated November
         30, 1995, by and between The Broken Hill Proprietary Company
         Limited, a Victoria, Australia corporation ("Parent"), and
         Warburg Pincus Capital Company, L.P., a Delaware limited
         partnership ("Seller").  


                                    RECITALS

                   Concurrently herewith, Parent, certain subsidiaries
         of Parent and Magma Copper Company (the "Company"), a
         Delaware corporation, are entering into an Agreement and Plan
         of Merger of even date herewith (the "Merger Agreement";
         capitalized terms used but not defined herein shall have the
         meanings set forth in the Merger Agreement), pursuant to
         which Sub will make a tender offer (the "Offer") for all
         outstanding shares of common stock, par value $.01 per share
         (the "Common Stock"), of the Company, at a price of $28 per
         share (the "Offer Price"), net to the seller in cash, to be
         followed by a merger (the "Merger") of Sub with and into the
         Company.

                   As of the date hereof, Seller beneficially owns
         shares of Common Stock (such shares, together with any shares
         of Common Stock acquired after the date hereof and prior to
         the termination hereof, whether upon the exercise of options,
         conversion of convertible securities or otherwise, collec-
         tively, referred to herein as the "Shares").  

                   As a condition to its willingness to enter into the
         Merger Agreement and Sub's willingness to make the Offer,
         Parent has required that Seller agree, and Seller has agreed,
         to tender in the Offer all of the Shares owned by Seller on
         the terms and conditions provided for herein.

                                    AGREEMENT

                   To implement the foregoing and in consideration of
         the mutual agreements contained herein, the parties agree as
         follows:

                   1.   Agreement to Tender and Vote.

                   1.1  Tender.  Seller hereby agrees to validly ten-
         der pursuant to the Offer, and not withdraw, all of the
         Shares.<PAGE>






                   1.2  Voting.  Seller hereby agrees that, during the
         time this Agreement is in effect, at any meeting of the
         stockholders of the Company, however called, Seller shall (a)
         vote the Shares in favor of the Merger; (b) vote the Shares
         against any action or agreement that would result in a breach
         in any material respect of any covenant, representation or
         warranty or any other obligation or agreement of the Company
         under the Merger Agreement; and (c) vote the Shares against
         any action or agreement (other than the Merger Agreement or
         the transactions contemplated thereby) that would impede,
         interfere with, delay, postpone or attempt to discourage the
         Merger or the Offer, including, but not limited to:  (i) any
         extraordinary corporate transaction, such as a merger, con-
         solidation or other business combination involving the Com-
         pany and its subsidiaries; (ii) a sale or transfer of a mate-
         rial amount of assets of the Company and its subsidiaries or
         a reorganization, recapitalization or liquidation of the Com-
         pany and its subsidiaries; or (iii) any change in the Com-
         pany's management or in the board of directors of the Company
         (the "Board"), except as otherwise agreed to in writing by
         Parent.

                   2.   Expiration.  This Agreement and Seller's obli-
         gation to tender and vote the Shares as provided hereto shall
         terminate on the Expiration Date.  As used herein, the term
         "Expiration Date" means the first to occur of (a) the Effec-
         tive Time, (b) termination of the Merger Agreement in accor-
         dance with its terms, (c) the Board of Directors of the
         Company having withdrawn its approval or recommendation of
         the Offer or the Merger, (d) the Board of Directors of the
         Company having modified its approval of the Offer or the
         Merger in a manner adverse to Parent, and (e) written notice
         of termination of this Agreement by Parent to Seller.

                   3.   Representations and Warranties.

                   3.1  Representations and Warranties of Parent.
         Parent hereby represents and warrants to Seller as follows:

                   (a)  Due Authorization.  This Agreement has been
              duly authorized by all necessary corporate action on the
              part of Parent, has been duly executed and delivered on
              behalf of Parent by a duly authorized officer of Parent,
              and is valid, binding and enforceable against Parent in
              accordance with its terms except to the extent that
              enforceability thereof may be limited by applicable
              bankruptcy, insolvency, reorganization, moratorium or 





                                       -2-<PAGE>






              other similar laws relating to or affecting the enforce-
              ment of creditors' rights generally or by equitable
              principles.  The execution, delivery and performance of
              this Agreement by Parent and the consummation by it of
              the transactions contemplated hereunder do not require
              the consent, waiver, approval, license or authorization
              of or any filing with any person or domestic public
              authority and will not violate, result in a breach of or
              the acceleration of any obligation under, or constitute
              a default under, any provision of Parent's charter or
              by-laws, or any indenture, mortgage, lease, agreement,
              contract, instrument, order, judgment, ordinance, regu-
              lation or decree specifically applicable to Parent, the
              effect of which could impair the ability of Parent to
              perform its obligations under this Agreement.  Parent is
              a corporation duly organized, validly existing and in
              good standing under the laws of Victoria, Australia and
              has the full corporate power and authority to execute,
              deliver and perform this Agreement.

                   (b)  Distribution.  Parent is acquiring the Shares
              for its own account for investment only and not with a
              view to the distribution or resale of the Shares so ac-
              quired.  Any sale, transfer or other disposition of the
              Shares by Parent will be made in compliance with all
              applicable provisions of the 1933 Act, and the rules and
              regulations thereunder.

                   3.2  Representations and Warranties of Seller.
         Seller hereby represents and warrants to Parent as follows:

                   (a)  Due Authorization.  This Agreement has been
              duly authorized by all necessary partnership action on
              the part of Seller, has been duly executed and delivered
              by a duly authorized officer of Seller, and is valid,
              binding and enforceable against Seller in accordance
              with its terms, except to the extent that enforceability
              thereof may be limited by applicable bankruptcy, insol-
              vency, reorganization, moratorium or other similar laws
              relating to or affecting the enforcement of creditors'
              rights generally or by equitable principles.  The execu-
              tion, delivery and performance of this Agreement by
              Seller and the consummation by it of the transactions
              contemplated hereunder do not require the consent,
              waiver, approval, license or authorization of or any
              filing (other than in compliance with the 1933 Act, the
              Exchange Act, the Hart-Scott-Rodino Act, the rules of
              the New York Stock Exchange, or securities or blue sky
              laws), with any person or domestic public authority and 



                                       -3-<PAGE>






              will not violate, result in a breach of or the accelera-
              tion of any obligation under, or constitute a default
              under, any provision of Seller's restriction set forth
              in the Certificate of Limited Partnership or Agreement
              of Limited Partnership, or any indenture, mortgage,
              lease, agreement, contract, instrument, order, judgment,
              ordinance, regulation or decree specifically applicable
              to Seller, the effect of which would be material and
              adverse to the ability of Seller to consummate the
              transactions contemplated in this Agreement.  Seller is
              a limited partnership duly organized, validly existing
              and in good standing under the laws of the State of Del-
              aware and has the full partnership power and authority
              to execute, deliver and perform this Agreement.

                   (b)  Consent of Independent Directors.  Prior to
              the execution and delivery of this Agreement, Seller has
              obtained written approval of the Company, in accordance
              with the terms of the Standstill Agreement dated
              November 30, 1988 between Seller and the Company (the
              "Standstill Agreement"), of the transactions contem-
              plated in this Agreement, including the approval of a
              majority (but not less than two) of the Independent
              Directors of the Company (as such term as defined in the
              Standstill Agreement) to tender and vote all of the
              Shares as contemplated by this Agreement.

                   (c)  Shares.  Seller beneficially owns all of the
              Shares, and has good and marketable title thereto, free
              and clear of all claims, liens, encumbrances, security
              interests and charges of any nature whatsoever
              (together, "Liens") other than the restrictions on
              transfer set forth in the Standstill Agreement.  Upon
              the tender of the Shares pursuant to the Offer, Seller
              shall transfer to the Parent good and valid title to the
              Shares free and clear of all Liens.

                   4.   Certain Covenants of Seller.  Except in ac-
         cordance with the terms of this Agreement, Seller hereby cov-
         enants and agrees as follows:

                   4.1  No Solicitation.  Seller shall not, directly
         or indirectly, solicit any proposal by any person or entity
         (other than Parent or any affiliate of Parent) which consti-
         tutes, or may reasonably be expected to lead to, an Acquisi-
         tion Proposal.  Seller will immediately cease and cause to be
         terminated any existing activities, discussions or negotia-
         tions with any parties conducted heretofore with respect to
         any of the foregoing.



                                       -4-<PAGE>






                   4.2  Restriction on Transfer, Proxies and Non- In-
         terference.  Seller hereby agrees, while this Agreement is in
         effect, and except as contemplated hereby, not to (i) sell,
         transfer, pledge, encumber, assign or otherwise dispose of,
         or enter into any contract, option or other arrangement or
         understanding with respect to the sale, transfer, pledge,
         encumbrance, assignment or other disposition of, any of the
         Shares or (ii) grant any proxies, deposit any Shares into a
         voting trust or enter into a voting agreement with respect to
         any Shares or (iii) take any action that would make any rep-
         resentation or warranty of Seller contained herein untrue or
         incorrect or have the effect of preventing or disabling
         Seller from performing his obligations under this Agreement.

                   4.3  Fiduciary Duties.  Notwithstanding anything in
         this Agreement to the contrary, the covenants and agreements
         set forth herein shall not prevent any of the Seller's desig-
         nees serving on the Company's Board of Directors from taking
         any action, subject to the applicable provisions of the
         Merger Agreement, while acting in such designee's capacity as
         a director of the Company.  

                   5.   Further Assurances.  From time to time, at the
         other party's request and without further consideration, each
         party hereto shall execute and deliver such additional docu-
         ments and take all such further action as may be necessary or
         desirable to consummate and make effective, in the most expe-
         ditious manner practicable, the transactions contemplated by
         this Agreement.

                   6.   Miscellaneous.

                   6.1  Entire Agreement; Assignment.  This Agreement
         (i) constitutes the entire agreement among the parties with
         respect to the subject matter hereof and supersedes all other
         prior agreements and understandings, both written and oral,
         between the parties with respect to the subject matter hereof
         and (ii) shall not be assigned by operation of law or other-
         wise, provided that Parent may assign its rights and obliga-
         tions hereunder to any direct or indirect wholly owned sub-
         sidiary of Parent, but no such assignment shall relieve Par-
         ent of its obligations hereunder if such assignee does not
         perform such obligations.

                   6.2  Amendments.  This Agreement may not be modi-
         fied, amended, altered or supplemented, except upon the ex-
         ecution and delivery of a written agreement executed by the
         parties hereto.




                                       -5-<PAGE>






                   6.3  Notices.  All notices, requests, claims, de-
         mands and other communications hereunder shall be in writing
         and shall be given (and shall be deemed to have been duly
         received if so given) by hand delivery, telegram, telex or
         telecopy, or by mail (registered or certified mail, postage
         prepaid, return receipt requested) or by any courier service,
         such as Federal Express, providing proof of delivery.  All
         communications hereunder shall be delivered to the respective
         parties at the following addresses:

              If to the Seller:

                   Warburg Pincus Capital Company, L.P.
                   466 Lexington Avenue
                   New York, New York  10017

                   Attention:  John L. Vogelstein

              copy to:

                   Wachtell, Lipton, Rosen & Katz
                   51 West 52nd Street
                   New York, New York  10019

                   Attention:  Andrew R. Brownstein, Esq.

              If to Parent:

                   The Broken Hill Proprietary
                     Company Limited
                   BHP Tower
                   600 Bourke Street
                   Melbourne, Victoria
                   3000, Australia

                   Attention:  Corporate Secretary

              copy to:

                   Arnold & Porter
                   399 Park Avenue
                   New York, New York 10022

                   Attention:  Joseph Handros, Esq.

         or to such other address as the person to whom notice is
         given may have previously furnished to the others in writing
         in the manner set forth above.




                                       -6-<PAGE>






                   6.4  Governing Law.  This Agreement shall be gov-
         erned by and construed in accordance with the laws of the
         State of Delaware, regardless of the laws that might other-
         wise govern under applicable principles of conflicts of laws
         thereof.

                   6.5  Specific Performance.  Each of the parties
         hereto recognizes and acknowledges that a breach by it of any
         covenants or agreements contained in this Agreement will
         cause the other party to sustain damages for which it would
         not have an adequate remedy at law for money damages, and
         therefore each of the parties hereto agrees that in the event
         of any such breach the aggrieved party shall be entitled to
         the remedy of specific performance of such covenants and
         agreements and injunctive and other equitable relief in addi-
         tion to any other remedy to which it may be entitled, at law
         or in equity.

                   6.6  Counterparts.  This Agreement may be executed
         in two counterparts, each of which shall be deemed to be an
         original, but both of which shall constitute one and the same
         Agreement.

                   6.7  Descriptive Headings.  The descriptive head-
         ings used herein are inserted for convenience of reference
         only and are not intended to be part of or to affect the
         meaning or interpretation of this Agreement.

                   6.8  Severability.  Whenever possible, each provi-
         sion or portion of any provision of this Agreement will be
         interpreted in such manner as to be effective and valid under
         applicable law but if any provision or portion of any provi-
         sion of this Agreement is held to be invalid, illegal or un-
         enforceable in any respect under any applicable law or rule
         in any jurisdiction, such invalidity, illegality or unen-
         forceability will not affect any other provision or portion
         of any provision in such jurisdiction, and this Agreement
         will be reformed, construed and enforced in such jurisdiction
         as if such invalid, illegal or unenforceable provision or
         portion of any provision had never been contained herein.












                                       -7-<PAGE>






                   IN WITNESS WHEREOF, Parent and Seller have caused
         this Agreement to be duly executed as of the day and year
         first above written.


                                       THE BROKEN HILL PROPRIETARY
                                         COMPANY LIMITED


                                       By:   /s/ Graeme W. McGregor   
                                          Name:  Graeme W. McGregor
                                          Title: Executive General
                                                   Manager


         WARBURG PINCUS CAPITAL
           COMPANY, L.P.


         By:  WARBURG, PINCUS & CO.,
              General Partner


              By:   /s/ John L. Vogelstein   
                 Name:  John L. Vogelstein
                 Title: General Partner


























                                       -8-


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