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ASSETS AND LIABILITIES HELD FOR SALE - Components (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	$ 63,670	$ 0
Liabilities held for sale	6,903	$ 0
Disposal Group, Disposed of by Sale | Pitarrilla Project
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	205
Trade and other receivables	31
Prepaids and other current assets	122
Mineral properties, plant, and equipment, net	62,179
Other non-current assets	1,133
Assets held for sale	63,670
Accounts payable	24
Accrued liabilities and other	864
Deferred income tax liabilities	5,952
Reclamation and remediation costs	63
Liabilities held for sale	$ 6,903

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