INCOME AND MINING TAXES - Deferred Income Tax Recovery (Expense) and Net Income (Loss) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax recovery (expense)
United States	$ 387,000	$ 817,000	$ 2,420,000
Foreign	6,928,000	573,000	1,424,000
Deferred tax benefit	7,315,000	1,390,000	3,844,000
Net income (loss) before tax:
United States	(24,808,000)	(127,524,000)	(22,319,000)
Foreign	(39,391,000)	(26,191,000)	(41,272,000)
Loss before income and mining taxes	$ (64,199,000)	$ (153,715,000)	$ (63,591,000)