CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenues - Note 14		$ 19,036,000	$ 11,146,000
Cost of sales:
Production costs		17,817,000	8,957,000
Depreciation and amortization		1,041,000	1,334,000
Mine site period costs - Note 4		10,544,000	6,634,000
Write-down of production inventories - Note 4		0	6,965,000
Total cost of sales		29,402,000	23,890,000
Operating expenses:
General and administrative		3,794,000	2,006,000
Projects and development		493,000	0
Accretion - Note 12		102,000	93,000
Loss from operations		(14,755,000)	(14,843,000)
Other income (expense):
Interest expense, net of capitalized interest - Note 9		(4,449,000)	(19,887,000)
Fair value adjustment to warrants - Note 19		9,493,000	0
Interest income		23,000	112,000
Loss before income taxes		(9,688,000)	(34,618,000)
Income taxes - Note 16		0	0
Net loss		$ (9,688,000)	$ (34,618,000)
Loss per share:
Basic (in dollars per share)		$ (0.16)	$ (107.07)
Diluted (in dollars per share)		$ (0.16)	$ (107.07)
Weighted average shares outstanding:
Basic (in shares)	[1]	59,901,306	323,328
Diluted (in shares)	[1]	59,901,306	323,328

[1] Retroactively restated March 31, 2020 for the reverse recapitalization. Refer to Note 3 - Recapitalization Transaction and Note 17 - Loss Per Share for further information.