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INCOME AND MINING TAXES - Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Deferred tax assets: |  |  |  |
Net operating loss carryforward | $ 57,983 | $ 65,174 |  |
Mineral properties | 52,471 | 69,326 |  |
Other temporary differences | 21,857 | 22,433 |  |
Total gross deferred tax assets | 132,311 | 156,933 |  |
Less: valuation allowance | (130,002) | (149,342) | $ (149,921) | $ (154,298)
Net deferred tax liabilities (assets) | 2,309 | 7,591 |  |
Deferred tax liabilities: |  |  |  |
Acquired mineral property interests | (2,895) | (7,746) |  |
Other temporary differences | (39,986) |  |  |
Total deferred tax liabilities | (42,881) | (7,746) |  |
Total net deferred tax liability | $ (40,572) | $ (155) |  |

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