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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Details) oz in Millions, lb in Millions | Dec. 31, 2018 lb oz $ / lb $ / oz
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Copper |
Estimated Recoverable Proven And Probable Reserves | lb | 124,000
Three Year Average Price | 2.65
Gold |
Estimated Recoverable Proven And Probable Reserves | oz | 30.8
Long Term Average Price Used To Estimate Recoverable Reserves | $ / oz | 1,000
Three Year Average Price | $ / oz | 1,259
Molybdenum |
Estimated Recoverable Proven And Probable Reserves | lb | 3,830
Long Term Average Price Used To Estimate Recoverable Reserves | 10
Three Year Average Price | 8.85
Silver |
Long Term Average Price Used To Estimate Recoverable Reserves | $ / oz | 15
North America [Member] | Copper |
Long Term Average Price Used To Estimate Recoverable Reserves | 2.50
Indonesia | Copper |
Long Term Average Price Used To Estimate Recoverable Reserves | 2.00

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