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Plant, Equipment, and Mine Development, Net (Tables)
 3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
Components of plant, equipment, and mine development, net
The following table provides the components of Plant, equipment, and mine development, net (dollars in thousands):
Depreciation Life
or Method		March 31,
2021		December 31,
2020
Leach padsUnits-of-production$17,432 $17,432 
Process equipment
5 - 15 years
17,459 16,065 
Buildings and leasehold improvements
10 years
10,507 10,507 
Mine equipment
5 - 7 years
6,707 5,961 
Vehicles
3 - 5 years
1,227 991 
Furniture and office equipment
7 years
341 322 
Mine developmentUnits-of-production1,096 756 
Mineral propertiesUnits-of-production37 37 
Construction in progress and other37,683 33,185 
$92,489 $85,256 
Less, accumulated depreciation and amortization(26,134)(25,033)
Total$66,355 $60,223