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INCOME AND MINING TAXES - Reconciliation of Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
INCOME AND MINING TAXES.
Loss before income and mining taxes	$ (153,715)	$ (63,591)	$ (47,640)
Statutory tax rate (as a percent)	21.00%	21.00%	21.00%
US Federal and State tax recovery (expense) at statutory rate	$ (32,280)	$ (13,354)	$ (10,004)
Reconciling items:
Equity pickup in MSC	374	2,626	2,966
Deferred foreign income inclusion	795	598	5,963
Realized flow-through expenditures	496	3,150	2,100
Realized flow-through premium	(338)	(2,954)	(1,675)
Tax rate changes	(147)	976
Adjustment for foreign tax rates	(2,043)	(200)	40
Other permanent differences	(7,062)	8,540	4,419
Unrealized foreign exchange rate (loss)/gain	4,663	(1,095)	(6,935)
NOL expires and revisions	1,066	810	(120)
Valuation allowance	33,086	(2,941)	476
Tax benefit	$ (1,390)	$ (3,844)	$ (2,770)

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