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Property, Plant and Equipment, net (Tables) | 6 Months Ended
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Jun. 30, 2018
Property, Plant and Equipment [Abstract] |
Schedule of net property, plant and equipment | Depreciation is calculated using the straight-line method over the estimated useful lives of the property, plant and equipment, which are:
| Years
Land improvements | 10
Plant and buildings | 5-15
Real estate properties | 10-40
Railroad and sidings | 30
Vehicles | 3-5
Machinery, equipment and tooling | 3-15
Furniture and fixtures | 3-10
Deferred stripping costs | 3
The acquisition cost has been allocated over the assets as set forth below.
Machinery, equipment and tooling | $ | 1,478 |
Plant and building | 1,407 |
Railroad and sidings | 9,926 |
Land improvements | 2,738 |
Total assets acquired | $ | 15,549 |
Net property, plant and equipment consisted of:
| June 30, 2018 |  | December 31, 2017
Machinery, equipment and tooling | $ | 11,791 |  |  | $ | 7,802 |
Vehicles | 1,671 |  |  | 1,546 |
Furniture and fixtures | 760 |  |  | 720 |
Plant and building | 143,622 |  |  | 81,561 |
Real estate properties | 4,441 |  |  | 4,432 |
Railroad and sidings | 25,691 |  |  | 10,254 |
Land improvements | 25,870 |  |  | 16,378 |
Asset retirement obligation | 10,493 |  |  | 8,408 |
Mineral properties | 9,879 |  |  | 9,878 |
Deferred mining costs | 782 |  |  | 657 |
Construction in progress | 22,527 |  |  | 56,493 |
| 257,527 |  |  | 198,129 |
Less: accumulated depreciation and depletion | 33,534 |  |  | 26,367 |
Total property, plant and equipment, net | $ | 223,993 |  |  | $ | 171,762 |

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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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