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RECLAMATION LIABILITIES (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 16, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclamation Liabilities [Roll Forward]
Balance, beginning of year		$ 104,744	$ 80,838
Liabilities assumed on the acquisition of Alacer		0	26,154
Reclamation expenditures		(243)	(2,447)
Accretion expense		4,821	3,815	$ 3,729
Additions, changes in estimate and other		15,722	(3,616)
Balance, end of year		125,044	104,744	$ 80,838
Less: current portion		(2,384)	(2,023)
Non-current reclamation liabilities		122,660	102,721
Business Acquisition [Line Items]
Liabilities assumed on the acquisition of Alacer		$ 0	$ 26,154
Alacer
Reclamation Liabilities [Roll Forward]
Liabilities assumed on the acquisition of Alacer	$ 26,200
Business Acquisition [Line Items]
Liabilities assumed on the acquisition of Alacer	$ 26,200

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Asset Retirement Obligation, Additions , Change In Estimate, And Other

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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.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Current portion of 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.

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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Noncurrent portion of 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.

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