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Property, Plant and Mine Development, net (Tables) | 6 Months Ended
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Jun. 30, 2018
Property, Plant and Mine Development, net |
Schedule of property, plant and mine development |
|  | 2018 |  | 2017
|  | (in thousands)
Asset retirement costs |  | $ | 969 |  | $ | 1,079
Construction-in-progress (1) |  |  | 17,844 |  |  | 10,838
Furniture and office equipment |  |  | 1,711 |  |  | 1,664
Land |  |  | 242 |  |  | 242
Light vehicles and other mobile equipment |  |  | 2,244 |  |  | 2,211
Machinery and equipment |  |  | 23,960 |  |  | 22,916
Mill facilities and infrastructure |  |  | 10,817 |  |  | 10,075
Mineral interests and mineral rights |  |  | 17,958 |  |  | 17,658
Mine development |  |  | 63,760 |  |  | 56,957
Software and licenses |  |  | 1,659 |  |  | 1,678
Subtotal (2) (3) |  |  | 141,164 |  |  | 125,318
Accumulated depreciation and amortization |  |  | (50,040) |  |  | (42,719)
Total |  | $ | 91,124 |  | $ | 82,599
| (1) |  | Includes Isabella Pearl asset and development costs of $11.3 million and $7.4 million at June 30, 2018 and December 31, 2017, respectively.
| (2) |  | Includes $1.6 million of assets recorded under capital leases at June 30, 2018 and December 31, 2017. Please see Note 12 for additional information.
| (3) |  | Includes accrued capital expenditures of $2.0 and $1.0 million at June 30, 2018 and December 31, 2017, respectively.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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