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ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

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	​

X

- 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.

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- References

No definition available.

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X

- 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

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