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

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