Property, Plant and Equipment, Net - Components of Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Feb. 28, 2021
Property, Plant and Equipment [Line Items]
Plant and equipment, gross	$ 87,105	$ 86,554
Less, accumulated depreciation and amortization	(34,014)	(31,722)
Total	53,091	54,832
Production leach pads
Property, Plant and Equipment [Line Items]
Plant and equipment, gross	$ 11,190	11,190
Test leach pads
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	18 months
Plant and equipment, gross	$ 6,241	6,241
Process equipment
Property, Plant and Equipment [Line Items]
Plant and equipment, gross	$ 17,556	17,302
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	10 years
Plant and equipment, gross	$ 9,419	9,280
Mine equipment
Property, Plant and Equipment [Line Items]
Plant and equipment, gross	4,732	4,872
Vehicles
Property, Plant and Equipment [Line Items]
Plant and equipment, gross	$ 1,700	1,578
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	7 years
Plant and equipment, gross	$ 713	370
Mineral properties
Property, Plant and Equipment [Line Items]
Plant and equipment, gross	50	0
Construction in progress and other
Property, Plant and Equipment [Line Items]
Plant and equipment, gross	$ 35,504	$ 35,721	$ 32,900
Minimum | Process equipment
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	5 years
Minimum | Mine equipment
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	5 years
Minimum | Vehicles
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	3 years
Maximum | Process equipment
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	15 years
Maximum | Mine equipment
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	7 years
Maximum | Vehicles
Property, Plant and Equipment [Line Items]
Depreciation Life or Method	5 years