Investment in Affiliate - Combined Statement of income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Expenses
Exploration	$ 1,657	$ 785
General and administrative	20,893	7,765
Total expenses	22,639	8,580
Other expense
Interest expense	(185)	(4,047)
Arrangement fees	(195)	(4,843)
Income tax benefit	0	0
Net loss	(43,438)	(40,441)
Los Gatos Joint Venture ("LGJV")
Investment in Affiliate
Sales	249,194	121,470
Expenses
Cost of sales	97,710	65,005
Royalties	4,781	2,148
Exploration	5,383	841
General and administrative	13,345	9,718
Depreciation, depletion and amortization	52,402	44,904
Other		3,416
Total expenses	173,621	126,032
Other expense
Interest expense	(5,542)	(12,484)
Loss on Term Loan extinguishment	(4,359)
Arrangement fees	(2,090)	(8,888)
Accretion expense	(924)	(849)
Other income	222	109
Foreign exchange loss (gain)	(749)	(1,042)
Total other (income) expense	13,442	23,154
Income (loss) before taxes	62,131	(27,716)
Mining tax expense	(954)
Income (loss) before income taxes	61,177	(27,716)
Income tax benefit	2,911
Net loss	$ 64,088	$ (27,716)