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Property, Plant and Equipment, net (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Abstract] |  |
Schedule of Net Property, Plant and Equipment | Net property, plant and equipment consists of:
|  | September 30, 2016 |  |  | December 31, 2015 |
Machinery, equipment and tooling |  | $ | 4,809 |  |  | $ | 4,673 |
Vehicles |  |  | 953 |  |  |  | 952 |
Furniture and fixtures |  |  | 303 |  |  |  | 303 |
Plant and building |  |  | 64,387 |  |  |  | 64,001 |
Real estate properties |  |  | 3,504 |  |  |  | 3,500 |
Railroad and sidings |  |  | 7,920 |  |  |  | 7,868 |
Land and improvements |  |  | 13,317 |  |  |  | 12,977 |
Asset retirement obligation |  |  | 1,135 |  |  |  | 1,135 |
Mineral properties |  |  | 9,785 |  |  |  | 9,785 |
Deferred mining costs |  |  | 417 |  |  |  | 155 |
Construction in progress |  |  | 16,517 |  |  |  | 16,637 |
|  |  | 123,047 |  |  |  | 121,986 |
Less: accumulated depreciation and depletion |  |  | 17,752 |  |  |  | 13,058 |
Total property, plant and equipment, net |  | $ | 105,295 |  |  | $ | 108,928 |
| Property, plant and equipment consists of the following at December 31, 2015 and 2014:
|  | 2015 |  |  | 2014 |
Machinery, equipment and tooling |  | $ | 4,673 |  |  | $ | 4,011 |
Vehicles |  |  | 952 |  |  |  | 733 |
Furniture and fixtures |  |  | 303 |  |  |  | 206 |
Plant and building |  |  | 64,001 |  |  |  | 43,785 |
Real estate properties |  |  | 3,500 |  |  |  | 2,131 |
Railroad and sidings |  |  | 7,868 |  |  |  | 7,193 |
Land and improvements |  |  | 12,977 |  |  |  | 9,132 |
Asset retirement obligation |  |  | 1,135 |  |  |  | 1,748 |
Mineral properties |  |  | 9,785 |  |  |  | 9,734 |
Deferred mining costs |  |  | 155 |  |  |  | — |
Construction in progress |  |  | 16,637 |  |  |  | 14,941 |
|  |  | 121,986 |  |  |  | 93,614 |
Less: accumulated depreciation and depletion |  |  | 13,058 |  |  |  | 7,799 |
Property, plant and equipment, net |  | $ | 108,928 |  |  | $ | 85,815 |

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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