SUMMARY

This summary highlights information contained elsewhere in this document and may not contain all of the information that is important to you. We urge you to carefully read the entire document and the other documents to which we refer in order to fully understand the merger and the related transactions. See “Where You Can Find More Information.”

The Merger

The terms and conditions of the merger are contained in the merger agreement, which is attached as Annex A to this document. Please carefully read the merger agreement as it is the legal document that governs the merger.

PXP Will Merge with and into IMONC LLC, a Wholly Owned Subsidiary of FCX

We are proposing the merger of PXP with and into Merger Sub, with Merger Sub continuing as the surviving company and a wholly owned subsidiary of FCX.

PXP Stockholders Will Receive Cash and/or Shares of FCX Common Stock in the Merger Depending on Their Election and Any Proration

You will have the right to elect to receive merger consideration, without interest, for each of your shares of PXP common stock in the form of cash or shares of FCX common stock, subject to proration in the circumstances described below. In the event of proration, you may receive all or a portion of the merger consideration in a form other than that which you elected.

The implied value of the merger consideration will fluctuate with the market price of FCX common stock and will be determined based on the average closing price of FCX common stock on the NYSE for the ten trading days immediately preceding the date which is five trading days immediately prior to the completion date of the merger. As explained in more detail in this document, whether you make a cash election or a stock election, the value of the consideration you receive as of the completion date of the merger will be substantially the same based on the average FCX closing price used to calculate the merger consideration. You may specify different elections with respect to different shares that you hold (if, for example, you own 100 shares of PXP common stock, you could make a cash election with respect to 50 shares and a stock election with respect to the other 50 shares).

As an example, based on the average of the closing prices of FCX common stock on the NYSE for the ten trading days ending on                 , 2013, for each share of PXP common stock held, you would receive either approximately $             in cash or                  shares of FCX common stock, subject to possible proration. We will compute the actual amount of cash and number of shares of FCX common stock that each PXP stockholder will receive in the merger using the formula contained in the merger agreement. For a summary of the formula contained in the merger agreement, see “The Merger Agreement—Consideration To Be Received in the Merger.”

Set forth below is a table showing the consideration that you would receive in a cash election, on the one hand, or in a stock election, on the other hand, under the merger consideration formula if the actual average of the closing prices of FCX common stock on the NYSE for the ten trading days immediately preceding the date which is five trading days immediately prior to the completion date of the merger were equal to the hypothetical range contained in the table. The table does not reflect the fact that cash will be paid instead of fractional shares.

As described below, regardless of whether you make a cash election or a stock election, you may nevertheless receive a mix of cash and stock.

The examples above are illustrative only. The value of the merger consideration that you actually receive will be based on the actual average closing price of FCX common stock on the NYSE for the ten trading days immediately preceding the date which is five trading days immediately prior to the completion date of the merger, as described below. The actual average closing price may be outside the range of the amounts set forth above, and as a result, the actual value of the merger consideration per share of FCX common stock may not be shown in the above table.

Regardless of Whether You Make a Cash Election or a Stock Election, You May Nevertheless Receive a Mix of Cash and Stock

The aggregate number of shares of FCX common stock that will be issued in the merger is approximately 86.6 million, and the aggregate amount of cash that will be paid in the merger will be approximately $3.31 billion, in each case subject to adjustment for changes in the number of PXP shares held in treasury and for exercises and forfeitures of certain PXP equity-based awards prior to the completion date of the merger and exclusive of certain shares of PXP common stock and PXP RSUs subject to the terms of certain letter agreements entered into by PXP, FCX and PXP’s named executive officers as described under “Proposal No. 1—The Merger—PXP’s Directors and Officers Have Financial Interests in the Merger—Employment Agreements and Letter Agreements.” As a result, if more PXP stockholders make valid elections to receive either FCX common stock or cash than is available as merger consideration under the merger agreement, those PXP stockholders electing the oversubscribed form of consideration will have the oversubscribed consideration proportionately reduced and substituted with consideration in the other form, despite their election.

What Holders of PXP Equity-Based Awards Will Receive

Pursuant to the terms of the merger agreement, each restricted share of PXP common stock that is outstanding immediately prior to the effective time of the merger (the “PXP Restricted Stock”), and each PXP restricted stock unit that has been granted or contractually promised by PXP as of the date of the merger agreement and that is outstanding immediately prior to or upon the effective time of the merger (the “PXP RSUs”) that would be settled in shares of PXP common stock absent the merger (collectively, the “Stock-Settled PXP RSUs”) (except for certain PXP RSUs held by each of the PXP named executive officers identified below) will become fully vested and be converted into the right to receive, at the election of the holder, cash consideration or stock consideration, subject to proration. Certain PXP RSUs held by each of the named executive officers of PXP as of the date of the merger agreement will become fully vested and will be converted into the right to receive cash consideration or stock consideration, subject to the terms and conditions set forth in certain letter agreements among each such named executive officer, FCX and PXP, which are described in further detail below. Each PXP RSU that would be settled in cash absent the merger (collectively, the “Cash-Settled PXP RSUs”) will become fully vested in accordance with the terms of the applicable award agreement and be converted into the right to receive cash in an amount equal to the cash consideration.

Each stock appreciation right relating to shares of PXP common stock outstanding and unexercised as of the effective time of the merger will become fully vested and be converted into a stock appreciation right relating to shares of FCX common stock as described in the merger agreement.

Each compensatory equity award granted or issued by PXP after the date of the merger agreement and prior to the effective time of the merger will be converted into the same type of award covering shares of FCX common stock as described in the merger agreement, with the same terms and conditions as prior to the completion of the merger.

In Order To Make a Valid Election, You Must Properly Complete and Deliver the Form of Election

If you wish to elect the type of merger consideration you prefer to receive in the merger, you should carefully review and follow the instructions set forth in the form of election, which is also being mailed to PXP stockholders. You will need to sign, date and complete the election form and transmittal materials and return them to the exchange agent at the address given in the materials, together with the certificates representing shares of PXP common stock (or a properly completed notice of guaranteed delivery) prior to the election deadline. The form of election also includes delivery instructions for shares held in book-entry form. You should NOT send your stock certificates with your proxy card.

The election deadline will be                 , 2013 or such other date as the parties agree. If you do not submit a properly completed and signed form of election to the exchange agent by the election deadline, you will have no control over the type of merger consideration you may receive, and, consequently, may receive only cash, only FCX common stock or a combination of cash and FCX common stock in the merger. If you hold shares in “street name,” you will have to follow your broker’s instructions to make an election.

Once you have tendered your PXP stock certificates to the exchange agent, you may not transfer your shares of PXP common stock represented by those stock certificates until the merger is completed, unless you revoke your election by written notice to the exchange agent that is received prior to the election deadline. If the merger is not completed and the merger agreement is terminated, stock certificates will be returned by the exchange agent.

If you are a registered PXP stockholder and fail to submit a properly completed form of election, together with your PXP stock certificates (or a properly completed notice of guaranteed delivery), prior to the election

deadline, you will be deemed not to have made an election. As a non-electing holder, you will be paid merger consideration in an amount per share that is equivalent in value to the amount paid per share to holders making elections, but you may be paid all in cash, all in FCX common stock, or in part cash and in part FCX common stock, depending on the remaining pool of cash and FCX common stock available for paying the merger consideration after honoring the cash elections and stock elections that other stockholders have made, and without regard to your preference.

The Merger Has Been Structured to Be Tax-Free to PXP Stockholders to the Extent They Receive FCX Common Stock

The exchange by U.S. holders of PXP common stock for FCX common stock has been structured to be generally tax-free for U.S. federal income tax purposes, except that:

For further information, please refer to “Material United States Federal Income Tax Consequences of the Merger.”

The United States federal income tax consequences described above may not apply to all holders of PXP common stock. Your tax consequences will depend on your individual situation. Accordingly, we strongly urge you to consult your tax advisor for a full understanding of the particular tax consequences of the merger to you.

Comparative Market Prices and Share Information

FCX common stock is quoted on the NYSE under the symbol “FCX.” PXP common stock is quoted on the NYSE under the symbol “PXP.” The following table shows the closing sale prices of FCX common stock and PXP common stock as reported on the NYSE on December 4, 2012, the last trading day before we announced the merger, and on April 1, 2013, the last practicable trading day prior to the date of this document. The table also presents the equivalent value of the merger consideration per share of PXP common stock on December 4, 2012 and April 1, 2013, calculated by multiplying the closing price of FCX common stock on those dates by 1.3062 and 1.4252, respectively, each representing the number of shares of FCX common stock that PXP stockholders electing to receive FCX common stock would receive in the merger for each share of PXP common stock, assuming that the average of the closing prices of FCX common stock on the NYSE for the ten trading days immediately preceding the date which is five trading days immediately prior to the completion date of the merger was the closing price of FCX common stock on December 4, 2012 and April 1, 2013, respectively, and assuming no proration.

The market price of FCX common stock and PXP common stock will fluctuate prior to the merger. You should obtain current stock price quotations for FCX common stock and PXP common stock.

Barclays Capital Inc. (“Barclays”) has Provided an Opinion to the PXP Board of Directors Regarding the Merger Consideration

PXP’s financial advisor, Barclays, has conducted financial analyses and delivered an opinion to the PXP board of directors that, as of the date of the merger agreement and based upon and subject to the qualifications, limitations and assumptions stated in its opinion, from a financial point of view, the consideration to be offered to PXP stockholders was fair to PXP stockholders. The full text of Barclays’ written opinion, dated as of December 5, 2012, is attached as Annex B to this document and is incorporated by reference herein in its entirety. Barclays’ written opinion sets forth, among other things, the assumptions made, procedures followed, factors considered and limitations upon the review undertaken by Barclays in rendering its opinion. PXP stockholders are encouraged to read the opinion and the description carefully and in their entirety. This summary and the description of the opinion are qualified in their entirety by reference to the full text of the opinion.

The PXP Board of Directors Recommends that PXP Stockholders Vote “FOR” Adoption of the Merger Agreement

The PXP board of directors believes that the merger is in the best interests of PXP and its stockholders and has unanimously approved the merger and the merger agreement. The PXP board of directors recommends that PXP stockholders vote “FOR” adoption of the merger agreement.

PXP’s Directors and Officers Have Financial Interests in the Merger That May Differ From Your Interests

In considering the information contained in this document, you should be aware that the executive officers and directors of PXP have financial interests in the merger that may be different from, or in addition to, the interests of other PXP stockholders. These additional interests of the executive officers and directors of PXP may create potential conflicts of interest and cause some of these persons to view the proposed transaction differently than you may view it as a stockholder.

For example, please be aware of the following interests:

The PXP board of directors was aware of these interests and took them into account in its decision to approve the merger agreement. For information concerning these interests, please see the discussion under the caption “Proposal No. 1—The Merger—PXP’s Directors and Officers Have Financial Interests in the Merger.”

Appraisal Rights

Under Section 262 of the General Corporation Law of the State of Delaware (the “DGCL”), holders of PXP common stock may have the right to obtain an appraisal of the fair value of their shares of PXP common stock in connection with the merger. To perfect appraisal rights, a PXP stockholder must not vote for the adoption of the merger agreement, must continue to hold their shares of common stock through the effective date of the merger and must strictly comply with all of the procedures required under Delaware law, including submitting a written demand for appraisal to PXP prior to the special meeting. Failure to strictly comply with Section 262 of the DGCL by a PXP stockholder may result in the loss or waiver of that stockholder’s appraisal rights. Because of the complexity of Delaware law relating to appraisal rights, if any PXP stockholder is considering exercising his, her or its appraisal rights, FCX and PXP encourage such PXP stockholder to seek the advice of his, her or its own legal counsel. A summary of the requirements under Delaware law to exercise appraisal rights is included in this document under “Proposal No. 1—The Merger—Appraisal Rights” and the text of Section 262 of the DGCL as in effect with respect to this transaction is included as Annex C to this document.

Conditions That Must Be Satisfied or Waived for the Merger to Occur

Currently, we expect to complete the merger in the second quarter of 2013. As more fully described in this document and in the merger agreement, the completion of the merger depends on a number of conditions being satisfied or, where legally permissible, waived. These conditions include, among others, approval by PXP stockholders, the receipt of all required regulatory approvals (including Merger Sub obtaining the necessary qualifications required by the Bureau of Ocean Energy Management and the Bureau of Safety and Environmental Enforcement to hold or operate oil and gas interests in the Gulf of Mexico), and the receipt of legal opinions by each company regarding the tax treatment of the merger. We cannot be certain when, or if, the conditions to the merger will be satisfied or waived, or that the merger will be completed.

Termination of the Merger Agreement

The merger agreement can be terminated at any time prior to completion by:

If the merger agreement is terminated, there will be no liability on the part of FCX or PXP, except that (1) both FCX and PXP will remain liable for any willful or intentional breach of any covenant or agreement or willful or intentional breach of any representation or warranty in the merger agreement occurring prior to termination or as provided for in the Confidentiality Agreement between PXP and FCX and (2) PXP may be required to pay FCX a termination fee and/or reimburse certain expenses of FCX.

Termination Fee

If the merger agreement is terminated:

PXP will pay FCX up to $69,000,000 in respect of its expenses within two business days of such termination.

If the merger agreement is terminated by FCX because PXP changes its recommendation to stockholders due to an alternative takeover proposal or materially breaches its non-solicitation obligations in the merger agreement, then PXP will pay FCX a termination fee of $207,000,000 (less any amounts previously paid in respect of expenses).

If the merger agreement is terminated by PXP because the merger has not closed by the End Date and at the time of termination (1) the PXP stockholders’ meeting has concluded and the PXP stockholder approval was not

obtained, and (2) FCX would have been permitted to terminate the merger agreement because the PXP board of directors has changed its recommendation to stockholders due to an alternative takeover proposal or has materially breached its non-solicitation obligations, then PXP will pay FCX a termination fee of $207,000,000 (less any amounts previously paid in respect of expenses).

If the merger agreement is terminated:

and, in each case, (i) a “company takeover proposal” (as defined in the description of the non-solicitation provisions herein, except that for purposes of the termination fee provisions references to 15% are changed to references to 50%) is publicly announced and not withdrawn at least 15 business days prior to the PXP stockholders’ meeting AND (ii) at any time on or prior to the twelve month anniversary of such termination PXP enters into a definitive agreement with respect to or completes the transaction contemplated by any company takeover proposal, then PXP will pay FCX up to $69,000,000 in respect of expenses (less any amounts previously paid in respect of expenses) within two business days of such termination and a termination fee of $207,000,000 (less any amounts paid in respect of expenses) upon the earlier of entering into such definitive agreement or completing such company takeover proposal.

Regulatory Approvals Required for the Merger

PXP and FCX have agreed to use their reasonable best efforts to obtain all regulatory approvals required to complete the transactions contemplated by the merger agreement. These approvals include approval (or a waiver from the application requirement) from the Bureau of Ocean Energy Management, the Bureau of Safety and Environmental Enforcement, the Federal Trade Commission and the Antitrust Division of the Department of Justice, as well as various other federal and regulatory authorities. FCX and PXP have completed, or will complete, the filing of applications and notifications to obtain the required regulatory approvals. On December 26, 2012, the Federal Trade Commission granted early termination of the waiting period with respect to the merger.

Although we do not know of any reason why we cannot obtain these regulatory approvals in a timely manner, we cannot be certain when or if we will obtain them.

The Rights of PXP Stockholders who Receive the Stock Consideration will be Governed by the FCX Certificate of Incorporation and Bylaws after the Merger

The rights of PXP stockholders will change as a result of the merger due to differences in FCX’s and PXP’s governing documents. This document contains a description of stockholder rights under each of the FCX and PXP governing documents and describes the material difference between them.

PXP will Hold its Special Meeting on                  , 2013

The special meeting will be held at                 , at                 , local time, on                 , 2013. At the special meeting, PXP stockholders will be asked to:

Record Date. Only holders of record of PXP common stock at the close of business on                 , 2013 will be entitled to vote at the special meeting. Each share of PXP common stock is entitled to one vote. As of the record date of                 , 2013, there were approximately             shares of PXP common stock entitled to vote at the special meeting.

Required Vote. The affirmative vote of holders of a majority of the outstanding shares of PXP’s common stock entitled to vote as of the record date is required to adopt the merger agreement. The affirmative vote of holders of a majority of the shares of PXP’s common stock present at the meeting, in person or by proxy, and entitled to vote is required to approve any adjournment of the special meeting, if necessary, to solicit additional proxies in favor of the proposal to adopt the merger agreement. Abstentions and any broker non-votes will have the same effect as a vote cast against such proposals.

A majority of the votes cast is required to approve, on an advisory (non-binding) basis, the specified compensation that may be received by PXP’s named executive officers in connection with the merger. The vote to approve the specified compensation is not a condition to the completion of the merger, and the vote of PXP’s stockholders on the proposal is advisory in nature and will not be binding on FCX or PXP. Accordingly, regardless of the outcome of the advisory vote, if the merger is approved and completed, specified compensation may be paid. Abstentions and any broker non-votes will not be counted “for” or “against” a proposal and, accordingly, will not have an effect on the outcome of the advisory vote.

As of the record date, directors and executive officers of PXP and its affiliates had the right to vote approximately             shares of PXP common stock, or         % of the outstanding PXP common stock entitled to be voted at the special meeting.

Litigation Relating to the Merger

Following the announcement of the merger on December 5, 2012, seventeen putative class and derivative actions challenging the transaction were filed by purported PXP and FCX stockholders. Three putative class actions were filed on behalf of PXP stockholders in the Court of Chancery of the State of Delaware. The Delaware class actions have been consolidated into a single action. The action names as defendants PXP, PXP’s directors, FCX, and an FCX subsidiary. The action alleges that PXP’s directors breached their fiduciary duties because they, among other things, pursued their own interests at the expense of stockholders, failed to maximize stockholder value with respect to the merger, and failed to disclose material facts regarding the merger, and that FCX and an FCX subsidiary aided and abetted the purported breach of fiduciary duties by PXP’s directors. The action seeks as relief an injunction barring or rescinding the merger, damages, and attorneys’ fees and costs. The court has scheduled a hearing on the PXP stockholder plaintiffs’ request for an injunction of the transaction for April 12, 2013.

Fourteen derivative actions challenging both the merger and the MMR merger were filed on behalf of FCX by purported FCX stockholders in the Court of Chancery of the State of Delaware and in the Superior Court of the State of Arizona, County of Maricopa. All but one of the Delaware derivative actions have been consolidated into a single action and the Arizona actions have been consolidated. The parties stipulated to allow the Arizona plaintiffs to intervene in the consolidated Delaware action, and the court granted that stipulation on March 18, 2013. The Arizona plaintiffs have agreed to seek a permanent stay of the Arizona actions. The actions name some or all of the following as defendants: the directors and certain officers of FCX, two FCX subsidiaries, PXP and certain of its directors, and MMR and certain of its directors. The actions allege that the FCX directors breached their fiduciary duties because they, among other things, pursued their own interests at the expense of stockholders in approving the

merger and the MMR merger. The complaints also allege that some or all of the following parties aided and abetted the wrongful acts allegedly committed by the directors and certain officers of FCX board: two FCX subsidiaries, PXP and certain of its directors, and MMR and certain of its directors. The actions seek as relief, among other things, an injunction barring or rescinding both the merger and the MMR merger transactions and requiring submission of the proposed merger and MMR merger to a vote of FCX stockholders, damages, and attorneys’ fees and costs. The plaintiffs in the Delaware derivative actions informed the court on March 21, 2013 that they will not seek a preliminary injunction barring either the merger or the MMR merger.

In addition, ten putative class actions challenging the MMR merger were filed on behalf of MMR stockholders in the Court of Chancery of the State of Delaware and in the Civil District Court for the Parish of Orleans of the State of Louisiana. Defendants moved for a stay in the Louisiana action on March 28, 2013. The Delaware actions have been consolidated into a single action. The actions allege that MMR’s directors breached their fiduciary duties because they, among other things, pursued their own interests at the expense of stockholders, failed to maximize stockholder value with respect to the MMR merger, and failed to disclose material facts regarding the MMR merger, and that PXP, FCX, or both, aided and abetted the breach of fiduciary duty by MMR’s directors. The Delaware action also asserts breach of contract claims against FCX and PXP derivatively on behalf of MMR. The actions seek, among other things, injunctive relief barring or rescinding the MMR merger, damages, and attorneys’ fees and costs. The PXP and FCX defendants believe the lawsuits are without merit and intend to defend vigorously against them. The court presiding over the Delaware action has scheduled a hearing on the MMR stockholder plaintiffs’ request for an injunction of the MMR merger for April 12, 2013.

Information about the Companies

Freeport-McMoRan Copper & Gold Inc.

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. FCX’s portfolio of assets includes the Grasberg minerals district in Indonesia, 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 minerals district in North America and the Cerro Verde and El Abra operations in South America, and the highly prospective Tenke Fungurume minerals district in the Democratic Republic of Congo. At December 31, 2012, consolidated recoverable proven and probable reserves included 116.5 billion pounds of copper, 32.5 million ounces of gold and 3.42 billion pounds of molybdenum. FCX’s global workforce includes approximately 34,000 employees. FCX’s stock trades on the NYSE under the ticker symbol “FCX”. As of December 31, 2012, FCX had total consolidated assets of approximately $35.4 billion and total consolidated equity of approximately $21.3 billion. The principal executive offices of FCX are located at 333 North Central Avenue, Phoenix, AZ 85004-2189, and its telephone number is (602) 366-8100.

Plains Exploration & Production Company

PXP is an independent energy company engaged in the upstream oil and gas business. The upstream business acquires, develops, explores for and produces oil and gas. PXP’s upstream activities are located in the United States. PXP owns oil and gas properties with principal operations in:

As of December 31, 2012, PXP’s proved reserves were 440.4 million barrels of oil equivalent, of which 82% was comprised of oil and 63% was proved developed. PXP common stock trades on the NYSE under the symbol “PXP”. PXP’s principal executive offices are located at 700 Milam, Suite 3100, Houston, Texas 77002, and its telephone number is (713) 579-6000.

Executive Officers and Directors

Certain executive officers and directors of each of FCX and PXP serve as executive officers and/or directors of MMR, as set forth below.

In addition, each of FCX and PXP own shares of MMR’s outstanding capital stock, as set forth below as of March 22, 2013.

FREEPORT-McMoRan COPPER & GOLD INC.

SELECTED HISTORICAL CONSOLIDATED FINANCIAL AND OPERATING DATA

The following selected historical consolidated financial data is derived from FCX’s audited consolidated financial statements for each of the years ended December 31, 2012, 2011, 2010, 2009 and 2008. These historical results are not necessarily indicative of results that you can expect for any future period. You should read this data in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations and FCX’s consolidated financial statements and notes thereto contained in FCX’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012, which is incorporated by reference in this proxy statement/prospectus. See “Where You Can Find More Information.”

FREEPORT-McMoRan COPPER & GOLD INC.

SELECTED CONSOLIDATED HISTORICAL FINANCIAL AND OPERATING DATA (CONTINUED)