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ASSET RETIREMENT OBLIGATIONS - Estimated Payments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Estimated payments of asset retirement obligations: |  |  |
2025 | $ 3,621 |  |
2026 | 4,763 |  |
2027 | 7,043 |  |
2028 | 9,312 |  |
2029 | 9,584 |  |
Thereafter | 244,592 |  |
Aggregate undiscounted asset retirement obligations | 278,915 |  |
Less: effect of discounting | (120,138) | $ (116,200) |
Total asset retirement obligations | 158,777 | 150,443 | $ 149,813
Less: current portion | (3,621) |  |
Non-current asset retirement obligations | 155,156 | 146,925 |
Surety bonds outstanding to performance of reclamation obligations | $ 170,100 | $ 173,500 |

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