CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenues	$ 3,831	$ 36,001	$ 12,997	$ 55,037
Cost of sales:
Production costs	3,634	29,494	13,217	47,311
Depreciation and amortization	632	1,573	1,552	2,614
Mine site period costs	2,551	2,434	9,020	12,978
Total cost of sales	6,817	33,501	23,789	62,903
Operating expenses:
General and administrative	5,248	5,164	8,320	8,958
Projects, exploration, and development	151	1,023	1,189	1,516
Accretion	102	102	204	204
Loss from operations	(8,487)	(3,789)	(20,505)	(18,544)
Other (expense) income:
Interest expense, net of capitalized interest	(4,198)	(5,298)	(9,544)	(9,747)
Interest income	20	9	20	32
Fair value adjustment to warrants	3,706	651	(1,615)	10,144
(Loss) gain on sale of equipment	(23)	0	602	0
Net loss	$ (8,982)	$ (8,427)	$ (31,042)	$ (18,115)
Loss per share:
Basic (in dollars per share)	$ (0.05)	$ (0.14)	$ (0.22)	$ (0.30)
Diluted (in dollars per share)	$ (0.05)	$ (0.14)	$ (0.22)	$ (0.30)
Weighted average shares outstanding:
Basic (in shares)	197,116,341	59,927,523	139,479,103	59,914,487
Diluted (in shares)	197,116,341	59,927,523	139,479,103	59,914,487