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INCOME AND MINING TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Deductible temporary differences relating to: |  |  |  |
Marketable securities | $ 46 | $ 1,147 |  |
Reclamation liabilities | 62,007 | 40,118 |  |
Lease liabilities | 22,107 | 26,618 |  |
Deductibility of other taxes | 11,279 | 10,311 |  |
Stock-based compensation | 1,732 | 2,030 |  |
Other items | 10,308 | 19,627 |  |
Deferred tax assets, gross | 107,479 | 99,851 |  |
Investment incentive tax credits | 21,436 | 17,912 |  |
Tax loss carryforwards | 145,531 | 53,164 |  |
Less: Valuation allowance | (225,962) | (74,640) | $ (61,101) | $ (38,496)
Total deferred income tax assets | 48,484 | 96,287 |  |
Taxable temporary differences relating to: |  |  |  |
Marketable securities | (1,001) | (1,137) |  |
Inventories | (17,455) | (16,969) |  |
Mineral properties, plant and equipment | (300,053) | (380,348) |  |
Mineral tax | (43,730) | (38,969) |  |
Other items | (5,920) | (409) |  |
Total deferred income tax liabilities | (368,159) | (437,832) |  |
Balance sheet presentation |  |  |  |
Deferred income tax assets | 7,602 | 22,307 |  |
Deferred income tax liabilities | (327,277) | (363,852) |  |
Deferred income tax liabilities, net | $ (319,675) | $ (341,545) |  |

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