CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenues	$ 9,166	$ 19,036
Cost of sales:
Production costs	9,583	17,817
Depreciation and amortization	920	1,041
Mine site period costs	6,469	10,544
Total cost of sales	16,972	29,402
Operating expenses:
General and administrative	3,072	3,794
Projects, exploration and development	1,038	493
Accretion	102	102
Loss from operations	(12,018)	(14,755)
Other (expense) income:
Interest expense, net of capitalized interest	(5,346)	(4,449)
Fair value adjustment to warrants	(5,321)	9,493
Gain on sale of equipment	625	0
Interest income	0	23
Net income (loss)	$ (22,060)	$ (9,688)
Loss per share:
Basic (in dollars per share)	$ (0.27)	$ (0.16)
Diluted (in dollars per share)	$ (0.27)	$ (0.16)
Weighted average shares outstanding:
Basic (in shares)	81,201,453	59,901,306
Diluted (in shares)	81,201,453	59,901,306