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Plant, Equipment, and Mine Development, Net
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Plant, Equipment, and Mine Development, Net 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		December 31,
2021		December 31,
2020
Leach padsUnits-of-production$17,431 $17,432 
Process equipment
5 - 15 years
17,735 16,065 
Buildings and leasehold improvements
10 years
9,280 10,507 
Mine equipment
5 - 7 years
6,224 5,961 
Vehicles
3 - 5 years
1,454 991 
Furniture and office equipment
7 years
330 322 
Mine developmentUnits-of-production— 756 
Construction in progress and other35,794 33,222 
$88,248 $85,256 
Less, accumulated depreciation and amortization(29,764)(25,033)
Total$58,484 $60,223 
Leach pads
The Company has historically recorded depreciation on its production leach pads by dividing the monthly ounce production by the estimated proven and probable mineral reserves included in its technical reports. As the Company ceased mining activities in November 2021 and no longer reports proven and probable mineral reserves for the Hycroft Mine, the Company estimated the remaining leach pad life based on available capacity in tons. As a result of this change in estimate, the Company recorded additional depreciation expense of $1.7 million for the year ended December 31, 2021.
Mine development
During the year ended December 31, 2021, the Company determined the previously capitalized mine development costs for drilling and additional studies related to it proven and probable mineral reserves reported under the 2019 Hycroft TRS no longer qualified for capitalization. As a result, the Company recorded an impairment charge of $6.7 million related to metallurgical testing and drill work previously capitalized that is included in Projects and development on the Consolidated Statements of Operations.
Construction in progress and other
The primary project included in construction in progress at December 31, 2021 was construction of a new larger leach pad, which continued through February 2021 at which time construction was suspended ($3.2 million, including $0.7 million of capitalized interest), resulting in construction costs for the new larger leach pad of $34.1 million since commencing construction in 2020.