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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Details) oz in Millions, lb in Millions | Dec. 31, 2017 USD ($) lb oz $ / lb
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Copper |
Estimated Recoverable Proven And Probable Reserves | lb | 103,700
Long Term Average Price Used To Estimate Recoverable Reserves | $ 2.00
Three Year Average Price | $ / lb | 2.50
Gold |
Estimated Recoverable Proven And Probable Reserves | oz | 34.2
Long Term Average Price Used To Estimate Recoverable Reserves | $ 1,000
Three Year Average Price | $ / lb | 1,223
Molybdenum |
Estimated Recoverable Proven And Probable Reserves | lb | 2,880
Long Term Average Price Used To Estimate Recoverable Reserves | $ 10
Three Year Average Price | $ / lb | 7.12
Silver |
Long Term Average Price Used To Estimate Recoverable Reserves | $ 15

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