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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Details) oz in Millions, lb in Millions	Dec. 31, 2018 lb oz $ / lb $ / oz
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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