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ASSET RETIREMENT OBLIGATIONS - Reclamation and Accretion (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclamation obligations
Reclamation adjustment reflecting updated estimates	$ (113)	$ 1,851	$ 2,259
Reclamation accretion	1,901	1,680	1,205
Total	$ 1,788	$ 3,531	$ 3,464

X

- Definition

Amount of reclamation adjustments during the period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of reclamation and remediation expenses.

+ References

No definition available.

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X

- Definition

Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866

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- References

No definition available.

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