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REVENUE - Narrative (Details) - $ / pound | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Disaggregation of Revenue [Line Items] |  |
Percent change in commodity prices used for sensitivity analysis | 10.00% |
Gold[member] |  |
Disclosure of Disaggregation of Revenue [Line Items] |  |
Percentage of composition of principal product (as percent) | 90.00% |
Copper |  |
Disclosure of Disaggregation of Revenue [Line Items] |  |
Average price of sales subject to final settlement (copper in dollars per pound; gold in dollars per oz) | 2.71 | 3.29

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