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CURRENT AND DEFERRED INCOME TAX - Unrecognized Deductible Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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