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ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2020

ASSET RETIREMENT OBLIGATIONS

Schedule of activity affecting the asset retirement and mine closing liability

​

​	​	​	​	​	​	​	​
​	​	Year Ended December 31,
​		2020			2019
​	​	(in thousands)					​
​	​	​	​	​	​	​	​
Beginning balance	​	$	137,514	​	$	137,114	​
Accretion expense	​		4,033	​		4,087	​
Payments	​		(1,769)	​		(2,948)	​
Allocation of liability associated with acquisitions, mine development and change in assumptions	​		(11,880)	​		(739)	​
Ending balance	​	$	127,898	​	$	137,514	​

Schedule of estimated payments of asset retirement obligations

​

​	​	​	​	​
Year Ended	​	​	​	​
December 31,		(in thousands)
​	​	​	​	​
2021	​	$	6,411	​
2022	​		2,723	​
2023	​		2,570	​
2024	​		3,317	​
2025	​		4,601	​
Thereafter	​		210,330	​
Aggregate undiscounted asset retirement obligations	​		229,952	​
Effect of discounting	​		(102,054)	​
Total asset retirement obligations	​		127,898	​
Less: current portion	​		(6,411)	​
Non-current asset retirement obligations	​	$	121,487	​

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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.

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- References

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859

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