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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Details) oz in Millions, lb in Millions | Dec. 31, 2016 USD ($) lb oz $ / lb
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Copper |
Estimated Recoverable Proven And Probable Reserves | lb | 104,600
Long Term Average Price Used To Estimate Recoverable Reserves | $ 2.00
Three Year Average Price | $ / lb | 2.60
Gold |
Estimated Recoverable Proven And Probable Reserves | oz | 37.6
Long Term Average Price Used To Estimate Recoverable Reserves | $ 1,000
Three Year Average Price | $ / lb | 1,226
Molybdenum |
Estimated Recoverable Proven And Probable Reserves | lb | 2,990
Long Term Average Price Used To Estimate Recoverable Reserves | $ 10
Three Year Average Price | $ / lb | 8.18
Silver |
Long Term Average Price Used To Estimate Recoverable Reserves | $ 15

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