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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Recoverable Reserves) (Details) oz in Millions, lb in Millions	Dec. 31, 2016 USD ($) lb oz
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated recoverable proven and probable copper reserves in leach stockpiles (in pounds)	2,200
Estimated recoverable proven and probable copper reserves in mill stockpiles (in pounds)	1,000
Copper
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	104,600
Long Term Average Price Used To Estimate Recoverable Reserves | $	$ 2.00
Gold (ounces) [Member]
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	37.6
Long Term Average Price Used To Estimate Recoverable Reserves | $	$ 1,000
Molybdenum mines
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	2,990
Long Term Average Price Used To Estimate Recoverable Reserves | $	$ 10
Silver
Estimated Recoverable Proven and Probable Reserves [Line Items]
Long Term Average Price Used To Estimate Recoverable Reserves | $	$ 15
Net Equity Interest [Member] | Copper
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	70,500
Net Equity Interest [Member] | Gold (ounces) [Member]
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	23.7
Net Equity Interest [Member] | Molybdenum mines
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	2,650
Net Equity Interest [Member] | Silver
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	226.0
Consolidated Basis [Member] | Copper
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	86,800
Consolidated Basis [Member] | Copper | North America
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	30,400
Consolidated Basis [Member] | Copper | South America
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	29,500
Consolidated Basis [Member] | Copper | Indonesia
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	26,900
Consolidated Basis [Member] | Gold (ounces) [Member]
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	26.1
Consolidated Basis [Member] | Gold (ounces) [Member] | North America
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.3
Consolidated Basis [Member] | Gold (ounces) [Member] | South America
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	0.0
Consolidated Basis [Member] | Gold (ounces) [Member] | Indonesia
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	25.8
Consolidated Basis [Member] | Molybdenum mines
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	2,950
Consolidated Basis [Member] | Molybdenum mines | North America
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	2,310
Consolidated Basis [Member] | Molybdenum mines | South America
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	640
Consolidated Basis [Member] | Molybdenum mines | Indonesia
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves	0
Consolidated Basis [Member] | Silver
Estimated Recoverable Proven and Probable Reserves [Line Items]
Estimated Recoverable Proven And Probable Reserves | oz	281.8

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