SCHEDULE 14A INFORMATION PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant |X| Filed by a Party other than the Registrant |_| Check the appropriate box: |_| Preliminary Proxy Statement |_| Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |_| Definitive Proxy Statement |X| Definitive Additional Materials |_| Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12 JOINT FILING BY: ASARCO INCORPORATED AND CYPRUS AMAX MINERALS COMPANY - ------------------------------------------------------------------------------ (Name of Registrant as Specified In Its Charter) N/A - ------------------------------------------------------------------------------ (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check the appropriate box): |X| No fee required. |_| Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11. (1) Title of each class of securities to which transaction applies: (2) Aggregate number of securities to which transaction applies: (3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11: (4) Proposed maximum aggregate value of transaction: (5) Total Fee paid: |_| Fee paid previously with preliminary materials. |_| Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing. (1) Amount Previously Paid:______________________________________ (2) Form, Schedule or Registration Statement No.:_________________ (3) Filing Party: ________________________________________________ (4) Date Filed: __________________________________________________ As filed with the Commission on September 20, 1999 SEPTEMBER 17, 1999 Dear Shareholders: THE ASARCO CYPRUS MERGER MEANS ENHANCED SHAREHOLDER VALUE. By VOTING FOR the Asarco Cyprus merger on September 30, you will: o own the largest publicly-traded copper company in the world; o receive a cash payment of $5.00 per Asarco Cyprus share after the merger's closing; and o realize ongoing value through Asarco Cyprus' global presence, world-class properties, enhanced financial strength and increased shareholder liquidity. By VOTING FOR the Asarco Cyprus merger, you are voting for a transaction that: o is accretive to shareholders; o positions shareholders to benefit from 100 percent of the $275 million of annual cost savings created by the merger; and o gives shareholders an investment unequalled in the copper industry in terms of the combination of a pipeline of growth properties, operating efficiencies and earnings power. By VOTING FOR the Asarco Cyprus merger YOU WILL SUBSTANTIALLY INCREASE THE POTENTIAL VALUE AND POWER OF YOUR INVESTMENT. This is why Phelps Dodge wants to breakup the Asarco Cyprus merger. PHELPS DODGE DOES NOT WANT YOU to create Asarco Cyprus. Phelps Dodge would rather have you GIVE UP MUCH OF WHAT YOU WOULD REALIZE IN AN ASARCO CYPRUS COMBINATION TO PHELPS DODGE'S SHAREHOLDERS. In the three-way deal proposed by Phelps Dodge, Asarco Cyprus would contribute: o 57% of production; o 61% of reserves; o lower cash costs; o 4 of the 5 lowest cost mines; o 60% of the copper margin; o 92% of the synergies; and o 91% of the cash. Yet, for all this, PHELPS DODGE WILL ONLY GIVE YOU 43% OF THE OWNERSHIP. In a virtually unprecedented action, Cyprus Amax and Asarco publicly stated the offer price at which they would consider a three-way combination with Phelps Dodge. Phelps Dodge ignored this response and proceeded with an expensive and hostile solicitation, including several lawsuits in an attempt to break up our merger. We think you should know that Phelps Dodge can't complete its exchange offer by September 30. Also, its offers are subject to numerous conditions, including anti-trust clearance and the approval of its own shareholders. THE CYPRUS AMAX AND ASARCO BOARDS UNANIMOUSLY REJECTED PHELPS DODGE'S EXCHANGE OFFERS AS INADEQUATE AND NOT IN THE BEST INTERESTS OF CYPRUS AMAX AND ASARCO SHAREHOLDERS. THE BOARDS UNANIMOUSLY RECOMMEND THAT SHAREHOLDERS VOTE FOR THE MERGER ON SEPTEMBER 30, 1999. It is the only transaction that assures you of value. It is the only transaction you can count on. We thank you for your support. We urge you to sign, date, and mail the WHITE proxy card today. /s/ Francis R. McAllister /s/ Milton H. Ward Francis R. McAllister Milton H. Ward Chairman and Chief Executive Chairman, Chief Executive officer Officer and President ASARCO Incorporated of Cyprus Amax Minerals Company IMPORTANT If your shares of Common Stock are held in the name of a bank or brokerage firm, only that firm can execute a proxy card on your behalf. Please contact the person responsible for your account and give instructions for a WHITE proxy card to be voted FOR the merger. If you need assistance or information, please call our proxy solicitors: Asarco Shareholders: Cyprus Amax Shareholders: MORROW & CO., INC. GEORGESON at (800) 662-5200 SHAREHOLDER or CHRIS SCHULTZ, Treasurer, Asarco COMMUNICATIONS INC at (212) 510-2329 at (800) 223-2064 or JOHN TARABA, VP and Controller, Cyprus Amax at (303) 643-5244 TO ALL ASARCO CYPRUS SHAREHOLDERS SINCE ASARCO CYPRUS BRINGS THIS TO A THREE WAY COMBINATION WITH PHELPS DODGE...... COPPER PRODUCTION CASH [Pie chart depicting copper production [Pie chart depicting cash brought brought by Asarco Cyprus (57%) and by Asarco Cyprus (91%) and Phelps Phelps Dodge (43%)] Dodge (9%)] COPPER RESERVES COPPER MARGIN [Pie chart depicting copper reserves [Pie chart depicting copper margin brought by Asarco Cyprus (61%) and brought by Asarco Cyprus (60%) and Phelps Dodge (39%)] Phelps Dodge (40%)] LOW COST MINES SYNERGIES [Pie chart depicting low cost mines [Pie chart depicting synergies brought by Asarco Cyprus (80%) and brought by Asarco Cyprus (92%) Phelps Dodge (20%)] and Phelps Dodge (8%)] WHY SHOULD YOU BECOME A MINORITY OWNER? OWNERSHIP [Pie chart depicting ownership of Asarco Cyprus (43%) and Phelps Dodge (57%)] VOTE "FOR" THE ASARCO CYPRUS MERGER ON SEPTEMBER 30