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Property, Plant and Mine Development, net - Summary of Property, Equipment and Mine Development (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, equipment and mine development - net
Property and equipment, gross	$ 284,510	$ 261,938
Accumulated depreciation and amortization	(131,947)	(105,167)
Total property, equipment and mine development - net	152,563	156,771
Accrued capital expenditures	1,300	1,700
Asset retirement costs
Property, equipment and mine development - net
Property and equipment, gross	7,449	1,065
Construction-In-Progress
Property, equipment and mine development - net
Property and equipment, gross	351	15,854
Furniture and office equipment
Property, equipment and mine development - net
Property and equipment, gross	1,732	1,685
Land
Property, equipment and mine development - net
Property and equipment, gross	9,033	9,230
Mineral interests
Property, equipment and mine development - net
Property and equipment, gross	79,543	79,964
Light Vehicles And Other Mobile Equipment
Property, equipment and mine development - net
Property and equipment, gross	2,327	2,224
Machinery And Equipment
Property, equipment and mine development - net
Property and equipment, gross	41,343	33,213
Mill facilities and infrastructure
Property, equipment and mine development - net
Property and equipment, gross	35,917	24,973
Mine Development
Property, equipment and mine development - net
Property and equipment, gross	105,263	92,138
Software and licenses
Property, equipment and mine development - net
Property and equipment, gross	$ 1,552	$ 1,592

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