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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Asset Retirement Obligations [Line Items]
Asset retirement obligation	$ 14,177	$ 13,687	$ 13,038
Minimum
Schedule of Asset Retirement Obligations [Line Items]
Risk Free Rate	9.50%
Inflation rate	2.00%
Maximum
Schedule of Asset Retirement Obligations [Line Items]
Risk Free Rate	11.67%
Inflation rate	2.41%
Canyon Project
Schedule of Asset Retirement Obligations [Line Items]
Asset retirement obligation	$ 42,750	$ 41,340

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[Line Items] for Schedule of Asset Retirement Obligations [Table]

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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