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Plant and Equipment, Net
 9 Months Ended
Sep. 30, 2022
Property, Plant and Equipment [Abstract]  
Plant and Equipment, Net Plant and Equipment, Net
The following table provides the components of Plant and equipment, net (dollars in thousands):
Depreciation Life
or Method		September 30,
2022		December 31,
2021
Production leach padsUnits-of-production$11,190 $11,190 
Test leach pads18 months6,241 6,241 
Process equipment
5 - 15 years
17,302 17,735 
Buildings and leasehold improvements
10 years
9,280 9,280 
Mine equipment
5 - 7 years
4,838 6,224 
Vehicles
3 - 5 years
1,589 1,454 
Furniture and office equipment
7 years
370 330 
Construction in progress and other35,674 35,794 
$86,484 $88,248 
Less, accumulated depreciation and amortization(31,003)(29,764)
Total$55,481 $58,484 
During the three and nine months ended September 30, 2022, there were no events or changes in circumstances that would have required the Company to evaluate the current carrying value of its Plant and equipment, net for recoverability. Depreciation expense related to Plant and equipment, net was $0.8 million and $2.7 million for the three and nine months ended September 30, 2022, respectively, and $2.2 million and $5.6 million for the three and nine months ended September 30, 2021, respectively.