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ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

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	​

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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