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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Details) oz in Millions, lb in Millions	Dec. 31, 2017 USD ($) lb oz $ / lb
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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