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MINERAL PROPERTIES, PLANT AND EQUIPMENT, NET - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Disposal Group, Disposed of by Sale | Royalty Portfolio      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss on impairment $ 0 $ 22,300,000 $ 0