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INCOME AND MINING TAXES - Reconciliation of Tax Provision (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
INCOME AND MINING TAXES.      
Loss before income and mining taxes $ (64,199,000) $ (153,715,000) $ (63,591,000)
Statutory tax rate (as a percent) 21.00% 21.00% 21.00%
US Federal and State tax recovery (expense) at statutory rate $ (13,482,000) $ (32,280,000) $ (13,354,000)
Reconciling items:      
Equity pickup in MSC 1,326,000 374,000 2,626,000
Deferred foreign income inclusion   795,000 598,000
Realized flow-through expenditures 6,148,000 496,000 3,150,000
Realized flow-through premium (3,486,000) (338,000) (2,954,000)
Adjustment for foreign tax rates (3,039,000) (2,043,000) (200,000)
Other permanent differences 9,353,000 (2,546,000) 8,421,000
NOL expires and revisions 241,000 1,066,000 810,000
Valuation allowance (4,377,000) 33,086,000 (2,941,000)
Tax benefit $ (7,315,000) $ (1,390,000) $ (3,844,000)