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CURRENT AND DEFERRED INCOME TAX - Unrecognized Deductible Temporary Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | $ 118,783 | $ 73,989
Mineral properties, plant and equipment |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 523 | 4,850
Close down and restoration provision |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 61,650 | 46,418
Carry forward tax loss and tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 38,235 | 15,192
Mineral and foreign withholding tax |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 570 | 616
Share-based compensation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 9,591 | 0
Other items |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | $ 8,214 | $ 6,913

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