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Plant, Equipment, and Mine Development, Net
6 Months Ended
Jun. 30, 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
June 30,
2021
December 31,
2020
Leach padsUnits-of-production$17,708 $17,432 
Process equipment
5 - 15 years
17,555 16,065 
Buildings and leasehold improvements
10 years
10,507 10,507 
Mine equipment
5 - 7 years
8,242 5,961 
Vehicles
3 - 5 years
1,322 991 
Furniture and office equipment
7 years
352 322 
Mine developmentUnits-of-production3,816 756 
Mineral propertiesUnits-of-production37 37 
Construction in progress and other36,529 33,185 
$96,068 $85,256 
Less, accumulated depreciation and amortization(27,444)(25,033)
Total$68,624 $60,223 
During the six months ended June 30, 2021, new process equipment was placed into service ($1.5 million), new mine equipment was placed into service ($2.3 million), and construction of a new larger leach pad 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, which was the primary project included in construction in progress as of June 30, 2021. For the six months ended June 30, 2021 and the year ended December 31, 2020, certain leach pads ($11.2 million) were not actively used in the leaching process, and accordingly, the Company did not record any depletion for these leach pads.
Mineral properties
As of June 30, 2021, and December 31, 2020, Mineral properties included an asset retirement obligation asset of $0.04 million that is being depreciated on a straight-line basis over the life of the Company’s only operating property, the Hycroft Mine.