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Property, Plant and Mine Development, net | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Mine Development, net |
Property, Plant and Mine Development, net | 7. Property, Plant and Mine Development, net At December 31, 2022 and 2021, property, plant and mine development consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands)
Asset retirement costs | ​ | $ | 7,449 | ​ | $ | 1,065
Construction-in-progress | ​ | ​ | 351 | ​ | ​ | 15,854
Furniture and office equipment | ​ | ​ | 1,732 | ​ | ​ | 1,685
Land | ​ | ​ | 9,033 | ​ | ​ | 9,230
Mineral interest | ​ | ​ | 79,543 | ​ | ​ | 79,964
Light vehicles and other mobile equipment | ​ | ​ | 2,327 | ​ | ​ | 2,224
Machinery and equipment | ​ | ​ | 41,343 | ​ | ​ | 33,213
Mill facilities and infrastructure | ​ | ​ | 35,917 | ​ | ​ | 24,973
Mine Development | ​ | ​ | 105,263 | ​ | ​ | 92,138
Software and licenses | ​ | ​ | 1,552 | ​ | ​ | 1,592
Subtotal (1) | ​ | ​ | 284,510 | ​ | ​ | 261,938
Accumulated depreciation and amortization | ​ | ​ | (131,947) | ​ | ​ | (105,167)
Total | ​ | $ | 152,563 | ​ | $ | 156,771
​
(1) | Includes capital expenditures in accounts payable and accruals of $1.3 million and $1.7 million at December 31, 2022 and 2021, respectively.
Asset retirement costs of $6.4 million were recognized on December 31, 2022 due to changes in estimates in the reclamation model, also increasing the asset retirement obligations. Please see Note 11—Reclamation and Remediation in Item 8—Financial Statements and Supplementary Data for additional information. In the first quarter of 2022, the gold regrind and dry stack tailings projects were completed and transferred out from construction-in-progress to mill facilities and infrastructure. We also added various machinery and equipment to the process plant and the underground mine (including filter press trays, mine equipment, low profile concrete mixer, etc.). The Company recorded depreciation and amortization expense for the years ended December 31, 2022 and 2021 of $28.0 million and $16.1 million, respectively.

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