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ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2023
ASSET RETIREMENT OBLIGATIONS |
Schedule of activity affecting the asset retirement and mine closing liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2023 |  | 2022 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance | ​ | $ | 149,813 | ​ | $ | 131,099 | ​
Accretion expense | ​ |  | 4,433 | ​ |  | 3,731 | ​
Payments | ​ |  | (2,317) | ​ |  | (2,445) | ​
Allocation of liability associated with mine development and change in assumptions | ​ |  | (1,486) | ​ |  | 17,428 | ​
Ending balance | ​ | $ | 150,443 | ​ | $ | 149,813 | ​
Schedule of estimated payments of asset retirement obligations | ​
​ | ​ | ​ | ​ | ​
Year Ended | ​ | ​ | ​ | ​
December 31, |  | (in thousands) |
​ | ​ | ​ | ​ | ​
2024 | ​ | $ | 3,518 | ​
2025 | ​ |  | 5,557 | ​
2026 | ​ |  | 4,063 | ​
2027 | ​ |  | 7,038 | ​
2028 | ​ |  | 4,291 | ​
Thereafter | ​ |  | 242,134 | ​
Aggregate undiscounted asset retirement obligations | ​ |  | 266,601 | ​
Less: effect of discounting | ​ |  | (116,158) | ​
Total asset retirement obligations | ​ |  | 150,443 | ​
Less: current portion | ​ |  | (3,518) | ​
Non-current asset retirement obligations | ​ | $ | 146,925 | ​

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- Definition Tabular disclosure of estimated future payments of asset retirement obligations for each of the five succeeding fiscal years and thereafter. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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