UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenues – Note 15	$ 0	$ 3,831	$ 0	$ 12,997
Cost of sales:
Production costs	0	3,634	0	13,217
Depreciation and amortization – Note 2	0	632	0	1,552
Mine site period costs – Note 2	0	2,551	0	9,020
Total cost of sales	0	6,817	0	23,789
Operating expenses:
Projects, exploration, and development	5,293	151	8,774	1,189
General and administrative	3,706	5,248	7,045	8,320
Mine site period costs – Note 2	2,822	0	6,631	0
Gain on settlement of accrued liability – Note 8	1,151	0	1,151	0
Depreciation and amortization – Note 2	711	0	1,429	0
Accretion – Note 12	186	102	372	204
Loss from operations	(11,567)	(8,487)	(23,100)	(20,505)
Other (expense) income:
Interest expense – Note 9	(4,587)	(4,198)	(9,023)	(9,544)
Interest income	2,121	20	4,059	20
Fair value adjustment to warrants – Notes 13 and 20	59	3,706	181	(1,615)
Gain (loss) on sale of equipment and supplies inventories	85	(23)	85	602
Net loss	$ (13,889)	$ (8,982)	$ (27,798)	$ (31,042)
Loss per share:
Basic (in dollars per share)	$ (0.07)	$ (0.05)	$ (0.14)	$ (0.22)
Diluted (in dollars per share)	$ (0.07)	$ (0.05)	$ (0.14)	$ (0.22)
Weighted average shares outstanding:
Basic (in shares)	200,820,986	197,116,341	200,547,312	139,479,103
Diluted (in shares)	200,820,986	197,116,341	200,547,312	139,479,103