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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Recoverable Reserves) (Details) | Dec. 31, 2014 lb
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Copper (pounds) [Member] | North America [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 35,600,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Copper (pounds) [Member] | South America [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 31,800,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [1]
Copper (pounds) [Member] | Indonesia [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 29,000,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Copper (pounds) [Member] | Africa [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 7,100,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | [1]
Gold (ounces) [Member] | North America [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 300,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember |
Gold (ounces) [Member] | South America [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember |
Gold (ounces) [Member] | Indonesia [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 28,200,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / us-gaap_StatementGeographicalAxis = country_ID |
Gold (ounces) [Member] | Africa [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember |
Molybdenum (pounds) [Member] | North America [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 2,420,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember |
Molybdenum (pounds) [Member] | South America [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 690,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember |
Molybdenum (pounds) [Member] | Indonesia [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / us-gaap_StatementGeographicalAxis = country_ID |
Molybdenum (pounds) [Member] | Africa [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember |
Consolidated Basis [Member] | Copper (pounds) [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 103,500,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_ConsolidatedBasisMember | [1],[2]
Consolidated Basis [Member] | Gold (ounces) [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 28,500,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_ConsolidatedBasisMember | [2]
Consolidated Basis [Member] | Molybdenum (pounds) [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 3,110,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_ConsolidatedBasisMember | [2]
Consolidated Basis [Member] | Cobalt (pounds) [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 850,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CobaltMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_ConsolidatedBasisMember |
Consolidated Basis [Member] | Silver (ounces) [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 282,900,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_SilverMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_ConsolidatedBasisMember |
Net Equity Interest [Member] | Copper (pounds) [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 82,800,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_NetEquityInterestMember | [1],[3]
Net Equity Interest [Member] | Gold (ounces) [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 25,900,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_NetEquityInterestMember | [3]
Net Equity Interest [Member] | Molybdenum (pounds) [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 2,790,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_NetEquityInterestMember | [3]
Net Equity Interest [Member] | Cobalt (pounds) [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 470,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CobaltMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_NetEquityInterestMember |
Net Equity Interest [Member] | Silver (ounces) [Member] |  |
Estimated Recoverable Proven and Probable Reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 232,400,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_SilverMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_NetEquityInterestMember |
[1] | Consolidated recoverable copper reserves included 3.6 billion pounds in leach stockpiles and 0.9 billion pounds in mill stockpiles.
[2] | Consolidated reserves represent estimated metal quantities after reduction for joint venture partner interests at the Morenci mine in North America and the Grasberg minerals district in Indonesia. Excluded from the table above were FCX’s estimated recoverable proven and probable reserves of 0.85 billion pounds of cobalt at Tenke and 282.9 million ounces of silver in Indonesia, South America and North America, which were determined using long-term average prices of $10 per pound for cobalt and $15 per ounce for silver.
[3] | Net equity interest reserves represent estimated consolidated metal quantities further reduced for noncontrolling interest ownership. Excluded from the table above were FCX’s estimated recoverable proven and probable reserves of 0.47 billion pounds of cobalt at Tenke and 232.4 million ounces of silver in Indonesia, South America and North America.

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