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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Recoverable Reserves) (Details) oz in Millions, lb in Millions | Dec. 31, 2017 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) | 2,100
Estimated recoverable proven and probable copper reserves in mill stockpiles (in pounds) | 700
Copper |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 103,700
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 | 34.2
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 | 2,880
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 | 71,300
Net Equity Interest [Member] | Gold (ounces) [Member] |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 21.3
Net Equity Interest [Member] | Molybdenum mines |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 2,560
Net Equity Interest [Member] | Silver |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 218.2
Consolidated Basis [Member] | Copper |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 86,700
Consolidated Basis [Member] | Copper | North America |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 33,500
Consolidated Basis [Member] | Copper | South America |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 28,100
Consolidated Basis [Member] | Copper | Indonesia |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 25,100
Consolidated Basis [Member] | Gold (ounces) [Member] |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | oz | 23.5
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 | 23.2
Consolidated Basis [Member] | Molybdenum mines |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 2,840
Consolidated Basis [Member] | Molybdenum mines | North America |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 2,220
Consolidated Basis [Member] | Molybdenum mines | South America |
Estimated Recoverable Proven and Probable Reserves [Line Items] |
Estimated Recoverable Proven And Probable Reserves | 620
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 | 273.4

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