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REVENUE - Provisional Copper and Gold Sales (Details) lb in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) lb | Dec. 31, 2017 USD ($) lb
Disclosure of Disaggregation of Revenue [Line Items] |  |
Percent change in commodity prices used for sensitivity analysis | 10.00% |
Copper |  |
Disclosure of Disaggregation of Revenue [Line Items] |  |
Volumes subject to final pricing Copper (millions) Gold (000s) | lb | 51 | 57
Impact on net income before taxation of 10% movement in market price US$ | $ | $ 14 | $ 19

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- Details
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