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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The cost basis and accumulated depreciation of property, plant and equipment at December 31, 2022 and 2021 are summarized in the table below:
Life in YearsAs of December 31,
(in thousands)20222021
Land and land improvements
0-31
$1,225 $1,225 
Plant and operating equipment
2-29
33,180 31,266 
Furniture and fixtures
2-11
1,709 1,388 
Machinery and equipment
3-10
2,116 697 
Leasehold improvements
3-12
2,149 2,089 
Construction in progress6,373 1,190 
46,752 37,855 
Less accumulated depreciation(11,897)(7,684)
Total property, plant and equipment, net$34,855 $30,171 
Included in plant and operating equipment as of December 31, 2022 and 2021 is mining equipment financed under various lease facilities, and obligations due under these facilities are included in finance lease obligations in the Consolidated Balance Sheets. The total amount recorded for ROU assets as of December 31, 2022 and 2021 related to finance lease obligations was $2.6 million and $1.7 million, respectively, net of accumulated depreciation of $2.0 million and $1.1 million.
Depreciation expense for the years ended December 31, 2022 and 2021 was $4.9 million and $5.5 million, respectively.