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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Recoverable Reserves) (Details) oz in Millions, lb in Millions | Dec. 31, 2016 USD ($) lb oz
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Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated recoverable proven and probable copper reserves in leach stockpiles (in pounds) | 2,200
Estimated recoverable proven and probable copper reserves in mill stockpiles (in pounds) | 1,000
Copper |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 104,600
Long Term Average Price Used To Estimate Recoverable Reserves | $ | $ 2.00
Gold (ounces) [Member] |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 37.6
Long Term Average Price Used To Estimate Recoverable Reserves | $ | $ 1,000
Molybdenum mines |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 2,990
Long Term Average Price Used To Estimate Recoverable Reserves | $ | $ 10
Silver |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Long Term Average Price Used To Estimate Recoverable Reserves | $ | $ 15
Net Equity Interest [Member] | Copper |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 70,500
Net Equity Interest [Member] | Gold (ounces) [Member] |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 23.7
Net Equity Interest [Member] | Molybdenum mines |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 2,650
Net Equity Interest [Member] | Silver |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 226.0
Consolidated Basis [Member] | Copper |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 86,800
Consolidated Basis [Member] | Copper | North America |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 30,400
Consolidated Basis [Member] | Copper | South America |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 29,500
Consolidated Basis [Member] | Copper | Indonesia |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 26,900
Consolidated Basis [Member] | Gold (ounces) [Member] |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 26.1
Consolidated Basis [Member] | Gold (ounces) [Member] | North America |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 0.3
Consolidated Basis [Member] | Gold (ounces) [Member] | South America |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 0.0
Consolidated Basis [Member] | Gold (ounces) [Member] | Indonesia |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 25.8
Consolidated Basis [Member] | Molybdenum mines |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 2,950
Consolidated Basis [Member] | Molybdenum mines | North America |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 2,310
Consolidated Basis [Member] | Molybdenum mines | South America |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 640
Consolidated Basis [Member] | Molybdenum mines | Indonesia |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 0
Consolidated Basis [Member] | Silver |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 281.8

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