INCOME TAXES - Disclosure of detailed information about effective income tax expense (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Disclosure Of Income Tax [Line Items] | ||
| Current income tax expense (recovery) | $ 3,481 | $ 2,993 |
| Deferred income tax expense (recovery) | 12,252 | (5,206) |
| Total income tax expense (recovery) | 15,733 | (2,213) |
| Current year [Member] | ||
| Disclosure Of Income Tax [Line Items] | ||
| Current income tax expense (recovery) | 754 | 1,053 |
| Deferred income tax expense (recovery) | 19,641 | 5,498 |
| Special mining duty [Member] | ||
| Disclosure Of Income Tax [Line Items] | ||
| Current income tax expense (recovery) | 2,726 | 1,989 |
| Deferred income tax expense (recovery) | 574 | 1,646 |
| Adjustments recognized in the current year in relation to prior years [Member] | ||
| Disclosure Of Income Tax [Line Items] | ||
| Current income tax expense (recovery) | 0 | (49) |
| Deferred income tax expense (recovery) | $ 7,962 | $ (12,350) |