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ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2024
ASSET RETIREMENT OBLIGATIONS |
Schedule of activity affecting the asset retirement and mine closing liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2024 |  | 2023 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance | ​ | $ | 150,443 | ​ | $ | 149,813 | ​
Accretion expense | ​ |  | 4,528 | ​ |  | 4,433 | ​
Payments | ​ |  | (1,770) | ​ |  | (2,317) | ​
Allocation of liability associated with mine development and change in assumptions | ​ |  | 5,576 | ​ |  | (1,486) | ​
Ending balance | ​ | $ | 158,777 | ​ | $ | 150,443 | ​
Schedule of estimated payments of asset retirement obligations | ​
​ | ​ | ​ | ​ | ​
Year Ended | ​ | ​ | ​ | ​
December 31, |  | (in thousands) |
​ | ​ | ​ | ​ | ​
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) | ​
Total asset retirement obligations | ​ |  | 158,777 | ​
Less: current portion | ​ |  | (3,621) | ​
Non-current asset retirement obligations | ​ | $ | 155,156 | ​

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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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