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RECLAMATION AND CLOSURE COST PROVISION - Changes in the reclamation and closure cost provision (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 16, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 27, 2019 USD ($) hectare
Reconciliation of changes in other provisions [abstract] |  |  |  |
Balance, beginning of year |  | $ 84,235 | $ 62,172 |
Provision assumed on acquisition of Alacer | $ 26,200 | 26,159 | 12,990 |
Reclamation expenditures |  | (2,447) | (3,568) |
Accretion expense |  | 3,887 | 3,743 |
Foreign exchange loss |  | 110 | 308 |
Revisions in estimates and obligations |  | (3,360) | 4,168 |
Impact of changes in discount rate |  | 10,990 | 4,490 |
Obligations related to divested mining properties |  | 0 | (68) |
Balance, ending of year |  | 119,574 | 84,235 |
Less: current portion |  | (1,924) | (8,766) |
Non-current reclamation and closure cost provision |  | $ 117,650 | $ 75,469 |
Hectares of land acquired (in hectares) | hectare |  |  |  | 8,900
Net smelter royalty, percentage |  |  |  | 0.50%
Cash transferred |  |  |  | $ 22,000
Consideration transferred, fair value |  |  |  | $ 13,000

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