MAGMA COPPER CO
SC 14D1/A, 1996-01-17
PRIMARY SMELTING & REFINING OF NONFERROUS METALS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                                 ------------
                                SCHEDULE 14D-1

                                Amendment No.4

              TENDER OFFER STATEMENT PURSUANT TO SECTION 14(D)(1)
                    OF THE SECURITIES EXCHANGE ACT OF 1934
                                 ------------
                             MAGMA COPPER COMPANY
                           (NAME OF SUBJECT COMPANY)

                                 BHP SUB INC.
                         A WHOLLY OWNED SUBSIDIARY OF

                            BHP HOLDINGS (USA) INC.
                      AN INDIRECT WHOLLY OWNED SUBSIDIARY
                                      OF
                  THE BROKEN HILL PROPRIETARY COMPANY LIMITED
                                   (BIDDERS)
                         COMMON STOCK, $0.01 PAR VALUE
            5 5/8% CUMULATIVE CONVERTIBLE PREFERRED STOCK, SERIES D
                                $0.01 PAR VALUE
              6% CUMULATIVE CONVERTIBLE PREFERRED STOCK, SERIES E
                                $0.01 PAR VALUE

                                  559177 20 9
                                 -------------
                        (CUSIP NUMBER OF COMMON STOCK)

                                  559117 30 8
                                 -------------
                  (CUSIP NUMBER OF SERIES D PREFERRED STOCK)

                                  559117 40 7
                                 -------------
                  (CUSIP NUMBER OF SERIES E PREFERRED STOCK)

                          T. Rognald Dankmeyer, Esq.
                   Senior Vice President and General Counsel
                                 BHP Minerals
                             550 California Street
                        San Francisco, California 94104
          (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON AUTHORIZED TO
           RECEIVE NOTICES AND COMMUNICATIONS ON BEHALF OF BIDDERS)

                                  copies to:

                             Joseph Handros, Esq.
                                Arnold & Porter
                                399 Park Avenue
                           New York, New York 10022

                                 (212)715-1125
                                 -------------

                               Page 1 of 4 Pages
                    THE EXHIBIT INDEX IS LOCATED ON PAGE 4
<PAGE>
 
  This Statement constitutes Amendment No. 4 to the Tender Offer Statement on 
Schedule 14D-1, dated December 5, 1995, filed by BHP Sub Inc., a Delaware 
corporation ("Purchaser"), which is a wholly owned subsidiary of BHP Holdings 
(USA) Inc., a Delaware corporation, which in turn is an indirect wholly owned 
subsidiary of The Broken Hill Proprietary Company Limited, a Victoria, Australia
corporation, relating to Purchaser's offer to purchase (1) all outstanding 
shares of Common Stock, par value $0.01 per share (the "Common Shares"), (2) all
outstanding shares of 5 5/8% Cumulative Convertible Preferred Stock, Series D, 
par value $0.01 per share (the "Series D Preferred Shares") and (3) all 
outstanding shares of 6% Cumulative Convertible Preferred Stock, Series E, par 
value $0.01 per share (the "Series E Preferred Shares"), of Magma Copper 
Company, a Delaware corporation, upon the terms and subject to the conditions 
set forth in the Offer to Purchase, dated December 5, 1995, and in the related 
Letter of Transmittal.

  Unless otherwise indicated, capitalized terms contained herein have the same 
meanings as set forth in the Offer to Purchase.

  1.  Item 10 is hereby amended to add the following to paragraphs (g) and (h) 
      thereof:

Item 10. Additional Information
         ----------------------

                                     * * *

(i)  On Friday, January 12, 1996, BHP issued a press release, a copy of which is
annexed hereto as Exhibit (g)(3) and incorporated herein by reference. Because 
the Series D Preferred Shares and Series E Preferred Shares are convertible at
any time into Common Shares, the number of shares outstanding of any class is
subject to change.

Item 11. Material to be Filed as Exhibits
         --------------------------------

(g)(3) Form of Press Release, issued January 12, 1996.

<PAGE>
 
                                   SIGNATURE

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

Dated: January 17, 1996

                                        BHP SUB INC.

                                        By: /s/ T. ROGNALD DANKMEYER
                                           ---------------------------
                                           Name:  T. Rognald Dankmeyer
                                           Title: Vice President

                                        BHP HOLDINGS (USA) INC.

                                        BY: /s/ T. ROGNALD DANKMEYER
                                           ---------------------------
                                           Name:  T. Rognald Dankmeyer
                                           Title: Vice President

                                        THE BROKEN HILL PROPRIETARY
                                        COMPANY LIMITED

                                        By: /s/ T. ROGNALD DANKMEYER
                                           ---------------------------
                                           Name:  T. Rognald Dankmeyer
                                                  Attorney-in-Fact


<PAGE>
 
                                 EXHIBIT INDEX


EXHIBIT                           DESCRIPTION                 PAGE NO.
- -------                  -----------------------------        --------
g(3)                     Form of Press Release, issued
                         January 12, 1996

<PAGE>
 
                                                              EXHIBIT (g)(3)

                             BHP Merger With Magma
                             ---------------------

San Francisco--January 12, 1996--The Broken Hill Proprietary Company Limited 
announced today that its subsidiary has acquired approximately 97 percent of all
the stock of Magma Copper Company (on a fully diluted basis) including more than
90 percent of each class of stock which will allow it to complete its merger 
with Magma next week. As of now approximately 400,000 shares of common stock 
remain outstanding.

The next step will be the integration of BHP and Magma's copper operations to 
form the BHP Copper Group led by Magma's President and CEO, Mr. J. Burgess 
Winter.

For further information contact:

BHP Media:        Jay Rhodes, San Francisco      (415) 774-2449 (work)
                                                 (415) 567-3600 (home)

BHP Investors:    Pierre Hirsch, San Francisco   (415) 774-2030 (work)

Magma:            Robbie Stephen, Tucson         (520) 575-5710 (work)
                  Sandy Cole, Tucson             (520) 575-4758 (work)


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