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Property, Plant and Mine Development, net | 9 Months Ended
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Sep. 30, 2021
Property, Plant and Mine Development, net |
Property, Plant and Mine Development, net | 9. Property, Plant and Mine Development, net ​ At September 30, 2021 and December 31, 2020, property, plant and mine development, net consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of
​ | ​ | September 30, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | (Unaudited) | ​ | ​ | ​
​ | ​ | (in thousands)
Asset retirement costs | ​ | $ | 1,071 | ​ | $ | 1,064
Construction-in-progress(1) | ​ | ​ | 13,265 | ​ | ​ | 7,158
Furniture and office equipment | ​ | ​ | 1,896 | ​ | ​ | 1,839
Land | ​ | ​ | 230 | ​ | ​ | 230
Light vehicles and other mobile equipment | ​ | ​ | 2,236 | ​ | ​ | 2,192
Machinery and equipment | ​ | ​ | 33,083 | ​ | ​ | 31,227
Mill facilities and infrastructure | ​ | ​ | 24,455 | ​ | ​ | 24,407
Mine Development | ​ | ​ | 89,760 | ​ | ​ | 83,859
Software and licenses | ​ | ​ | 1,636 | ​ | ​ | 1,619
Subtotal | ​ | ​ | 167,632 | ​ | ​ | 153,595
Accumulated depreciation and amortization | ​ | ​ | (101,315) | ​ | ​ | (91,084)
Total | ​ | $ | 66,317 | ​ | $ | 62,511
(1) | Includes accrued capital expenditures of $1.0 million both at September 30, 2021 and December 31, 2020.
​ The Company recorded depreciation and amortization expense of $3.5 million and $11.3 million for the three and nine months ended September 30, 2021, as compared with $4.3 million and $13.5 million for the same periods ended September 30, 2020.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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