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INCOME TAX EXPENSE (RECOVERY) - Reconciliation of tax rate (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of average effective tax rate and applicable tax rate    
Combined statutory income tax rate (as a percent) 26.50% 26.50%
Increase (decrease) resulting from:    
Mining taxes (as a percent) 1.20% 8.00%
Percentage of depletion (as a percent) (1.40%) (3.40%)
Difference in foreign tax rates and foreign exchange on deferred income taxes within income tax expense (as a percent) 4.50% 42.10%
Change in unrecognized deferred tax assets (as a percent) (4.10%) 59.20%
Over provided in prior periods (as a percent) (0.40%) (34.40%)
Income not subject to tax (as a percent) (0.70%) (17.10%)
Effect of non-deductible (non-taxable) impairment/(reversals) (as a percent) (4.20%) 0.20%
Accounting expenses disallowed for tax (as a percent) 2.30% 17.80%
Taxes on repatriation of foreign earnings (as a percent) 0.50% 12.40%
AMT credit receivable due to US Tax Reform (as a percent) (0.50%) (7.80%)
Other (as a percent) 1.90% 19.10%
Effective tax rate (as a percent) 25.60% 122.60%