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Property, Plant and Mine Development, net - Summary of Property, Equipment and Mine Development (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Property, equipment and mine development - net    
Property and equipment, gross [1] $ 274,033 $ 261,938
Accumulated depreciation and amortization (124,801) (105,167)
Total property, equipment and mine development - net 149,232 156,771
Accrued capital expenditures 200 1,700
Asset retirement costs    
Property, equipment and mine development - net    
Property and equipment, gross 1,065 1,065
Construction-In-Progress    
Property, equipment and mine development - net    
Property and equipment, gross 300 15,854
Furniture and office equipment    
Property, equipment and mine development - net    
Property and equipment, gross 1,719 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 2,328 2,224
Machinery And Equipment    
Property, equipment and mine development - net    
Property and equipment, gross 40,119 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 102,457 92,138
Software and licenses    
Property, equipment and mine development - net    
Property and equipment, gross $ 1,552 $ 1,592
[1] Includes accrued capital expenditures of $0.2 million and $1.7 million at September 30, 2022 and December 31, 2021, respectively.