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SIGNIFICANT JUDGMENTS, ESTIMATES AND ASSUMPTIONS (Details) | 12 Months Ended
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Dec. 31, 2019 $ / oz $ / bbl | Dec. 31, 2018 $ / oz $ / bbl
Estimated short-term and long-term prices of gold | $ / oz | 1,400 | 1,300
Estimated short-term and long-term prices of silver | $ / oz | 17.50 | 18.00
Estimated short-term and long-term oil prices | 60 |
Estimated short-term oil price |  | 65
Estimated long-term oil price |  | 55
Minimum |  |
Cash flow projection, term | 3 years |
Minimum | CGU |  |
Real discount rate | 3.33% | 4.86%
NAV multiples observed | 0.80% | 0.90%
Maximum |  |
Cash flow projection, term | 18 years |
Maximum | CGU |  |
Real discount rate | 6.97% | 7.12%
NAV multiples observed | 1.70% | 1.40%

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