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Plant, Equipment, and Mine Development, Net
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
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		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 
During the three months ended March 31, 2021, new process equipment was placed into service ($1.4 million), new mine equipment was placed into service ($0.7 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 March 31, 2021. For the three months ended March 31, 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 March 31, 2021, and December 31, 2020, Mineral properties included an asset retirement 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.
 Plant, Equipment, and Mine Development, Net
The following table provides the components of plant, equipment, and mine development, net (in thousands):
Depreciation Life
or Method		December 31,
2020		December 31,
2019
Leach padsUnits-of-production$17,432 $17,419 
Process equipment
5 - 15 years
16,065 14,770 
Buildings and leasehold improvements
10 years
10,507 10,507 
Mine equipment
5 - 7 years
5,961 4,716 
Vehicles
3 - 5 years
991 136 
Furniture and office equipment
7 years
322 129 
Mine developmentUnits-of-production756 119 
Mineral propertiesUnits-of-production37 — 
Construction in progress and other33,185 936 
$85,256 $48,732 
Less, accumulated depreciation and amortization(25,033)(17,208)
Total$60,223 $31,524 

During the year ended December 31, 2020, new process equipment was placed into service ($1.2 million), new mobile equipment was placed into service ($1.2 million), and construction of a new larger leach pad began ($30.9 million), which was the primary project included in construction in progress as of December 31, 2020. During the years ended December 31, 2020 and 2019, 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. Additionally, during the years ended December 31, 2020 and 2019, the Company did not acquire any plant, equipment, or mine development through non-cash capital leases.
Mineral properties
As of December 31, 2020, Mineral properties included an ARC 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.