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INCOME AND MINING TAXES - Reconciliation of Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INCOME AND MINING TAXES.
Loss before income and mining taxes	$ (80,288)	$ (64,199)	$ (153,715)
Statutory tax rate (as a percent)	21.00%	21.00%	21.00%
US Federal and State tax recovery (expense) at statutory rate	$ (16,860)	$ (13,482)	$ (32,280)
Reconciling items:
Equity pickup in MSC	(583)	1,326	374
Deferred foreign income inclusion			795
Realized flow-through expenditures	2,169	6,148	496
Realized flow-through premium	(2,011)	(3,486)	(338)
Adjustment for foreign tax rates	(8,384)	(3,039)	(2,043)
Deferred mining tax liability	116
Other permanent differences	31,369	9,353	(2,546)
NOL expires and revisions		241	1,066
Valuation allowance	(10)	(4,377)	33,086
Tax benefit	$ 5,806	$ (7,315)	$ (1,390)

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