FILED BY FREEPORT-MCMORAN COPPER & GOLD INC.

PURSUANT TO RULE 425 UNDER THE SECURITIES ACT OF 1933

SUBJECT COMPANY: PLAINS EXPLORATION & PRODUCTION COMPANY

REGISTRATION STATEMENT NO. 333-185747

333 North Central Avenue ¡ Phoenix, AZ 85004 Financial Contacts: Kathleen L. Quirk (602) 366-8016 David P. Joint (504) 582-4203 Media Contact: Eric E. Kinneberg (602) 366-7994

Freeport-McMoRan Copper & Gold Inc.

Comments on Plains Exploration & Production Company
Transaction – Agreed terms are “best and final”

PHOENIX, AZ, May 9, 2013 – Freeport-McMoRan Copper & Gold Inc. (NYSE: FCX) today reiterated its support for its proposed transaction with Plains Exploration & Production Co. (NYSE:PXP) and its commitment to completing the transaction on the terms agreed with the PXP Board of Directors. FCX and a Special Committee of its Board of Directors formed to consider the transaction also announced that the agreed terms are “best and final” and that Freeport did not intend to increase the consideration offered to PXP shareholders.

Pursuant to the merger agreement, FCX is offering PXP stockholders per-share consideration consisting of 0.6531 shares of FCX common stock and $25.00 in cash. The merger agreement and the merger are described in the definitive proxy statement, which was mailed to stockholders of PXP beginning on or about April 18, 2013 in connection with PXP’s special meeting scheduled for May 20, 2013.

James R. Moffett, Chairman of the Board and Richard C. Adkerson, President and Chief Executive Officer said, “The combined company would be a leading global resources company with long-lived and geographically diverse minerals and oil and gas reserves, strong margins and cash flows, an attractive growth pipeline and a strong balance sheet. We look forward to adding the PXP organization and shareholders to the combined company and to pursuing the opportunities that the combined businesses will provide for shareholders.”

FCX is a leading international mining company with headquarters in Phoenix, Arizona. FCX operates large, long-lived, geographically diverse assets with significant proven and probable reserves of copper, gold and molybdenum. FCX has a dynamic portfolio of operating, expansion and growth projects in the copper industry and is the world’s largest producer of molybdenum.

The company’s portfolio of assets includes the Grasberg minerals district, one of the world’s largest copper and gold mines in terms of recoverable reserves; significant mining operations in the Americas, including the large scale Morenci and Safford minerals districts in North America and the Cerro Verde and El Abra operations in South America; and the Tenke Fungurume minerals district in the Democratic Republic of Congo. Additional information about FCX is available on FCX’s website at www.fcx.com.

Cautionary Statement Regarding Forward Looking Statements: This press release contains forward-looking statements concerning the proposed transaction, the expected timetable for completing the proposed transaction, and other matters. Forward-looking statements are all statements other than statements of historical facts. The words “anticipates,” “may,” “can,” “plans,” “believes,” “estimates,” “expects,” “projects,” “intends,” “likely,” “will,” “should,” “to be,” and any similar expressions or other words of similar meaning are intended to identify those assertions as forward-looking statements. It is uncertain whether the events anticipated will transpire, or if they do occur what impact they will have on the results of operations and financial condition of FCX, PXP or of the combined company. These forward-looking statements involve significant risks and uncertainties that could cause actual results to differ materially from those anticipated, including but not limited to the ability of the parties to satisfy the conditions precedent and consummate the proposed transaction, the timing of consummation of the proposed transaction, the ability of the parties to secure regulatory approvals in a timely manner or on the terms desired or anticipated, the ability of FCX to integrate the acquired operations, the ability to implement the anticipated business plans following closing

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and achieve anticipated benefits and savings, and the ability to realize opportunities for growth. Other important economic, political, regulatory, legal, technological, competitive and other uncertainties are identified in the documents filed with the Securities and Exchange Commission (the “SEC”) by FCX and PXP from time to time, including their respective Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, and Current Reports on Form 8-K. The forward-looking statements including in this press release are made only as of the date hereof. Neither FCX nor PXP undertakes any obligation to update the forward-looking statements included in this press release to reflect subsequent events or circumstances.

Additional Information about the Proposed Transaction and Where to Find It: In connection with the proposed transaction, FCX has filed with the SEC a registration statement on Form S-4 that includes a definitive proxy statement of PXP that also constitutes a prospectus of FCX. FCX and PXP also plan to file other relevant documents with the SEC regarding the proposed transaction. INVESTORS ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND OTHER RELEVANT DOCUMENTS FILED WITH THE SEC, BECAUSE THEY CONTAIN IMPORTANT INFORMATION. You may obtain a free copy of the definitive proxy statement/prospectus and other relevant documents filed by FCX and PXP with the SEC at the SEC’s website at www.sec.gov. In addition, you may obtain free copies of the registration statement and the proxy statement/prospectus by phone, e-mail or written request by contacting the investor relations department of FCX or PXP at the following:

Freeport-McMoRan Copper & Gold Inc.	Plains Exploration & Production Company
333 N. Central Ave. Phoenix, AZ 85004 Attention: Investor Relations Phone: (602) 366-8400 Email: ir@fmi.com	700 Milam, Suite 3100 Houston, TX 77002 Attention: Investor Relations Phone: (713) 579-6000 Email: investor@pxp.com

FCX and PXP and their respective directors and executive officers and other members of management and employees may be deemed to be participants in the solicitation of proxies in respect of the proposed transaction. Information about FCX’s directors and executive officers is available in FCX’s 2012 Annual Report on Form 10-K, filed with the SEC on February 22, 2013, as amended on April 23, 2013. Information about PXP’s directors and executive officers is available in PXP’s 2012 Annual Report on Form 10-K filed with the SEC on February 21, 2013, as amended on February 25, 2013 and April 29, 2013. Other information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, is contained in the proxy statement/prospectus and other relevant materials which may be filed with the SEC regarding the merger. Investors should read the proxy statement/prospectus carefully before making any voting or investment decisions. You may obtain free copies of these documents from FCX or PXP using the sources indicated above.

This document shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the U.S. Securities Act of 1933, as amended.

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