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PROPERTY, PLANT, EQUIPMENT AND MINING DEVELOPMENT COSTS, NET (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) $ / lb | Dec. 31, 2016 $ / lb
Tyrone [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Impairment of Long-Lived Assets Held-for-use | $ | $ 37 |
Copper |  |
Property, Plant and Equipment [Line Items] |  |
Asset Impairment Evaluation, Average Price Assumption (Dollars per Pound) | 3.00 |
Average Price | 2.13 | 2.50
Molybdenum |  |
Property, Plant and Equipment [Line Items] |  |
Asset Impairment Evaluation, Average Price Assumption (Dollars per Pound) | 10.00 |
Average Price | 5.23 | 6.74
CME SWAPS MARKETS (COMEX) [Member] | Copper | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Asset Impairment Evaluation, Average Price Assumption (Dollars per Pound) | 2.15 |
CME SWAPS MARKETS (COMEX) [Member] | Copper | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Asset Impairment Evaluation, Average Price Assumption (Dollars per Pound) | 2.17 |
LONDON METAL EXCHANGE [Member] | Copper | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Asset Impairment Evaluation, Average Price Assumption (Dollars per Pound) | 2.13 |
LONDON METAL EXCHANGE [Member] | Copper | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Asset Impairment Evaluation, Average Price Assumption (Dollars per Pound) | 2.16 |

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