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v3.23.3

Property, Plant and Equipment, net | 9 Months Ended
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Sep. 30, 2023
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | Property, Plant and Equipment, net Net property, plant and equipment consisted of:
| September 30, 2023 |  | December 31, 2022
Machinery, equipment and tooling | $ | 40,114 |  |  | $ | 36,483 |
SmartSystems | 30,229 |  |  | 28,376 |
Vehicles | 4,066 |  |  | 3,835 |
Furniture and fixtures | 1,452 |  |  | 1,421 |
Plant and building | 208,685 |  |  | 200,480 |
Real estate properties | 6,184 |  |  | 6,155 |
Railroad and sidings | 33,765 |  |  | 33,698 |
Land and land improvements | 40,506 |  |  | 40,433 |
Asset retirement obligations | 22,583 |  |  | 22,583 |
Mineral properties | 7,442 |  |  | 7,442 |
Deferred mining costs | 3,802 |  |  | 2,470 |
Construction in progress | 9,108 |  |  | 10,421 |
| 407,936 |  |  | 393,797 |
Less: accumulated depreciation and depletion | 152,292 |  |  | 134,954 |
Total property, plant and equipment, net | $ | 255,644 |  |  | $ | 258,843 |
Depreciation expense was $6,776 and $6,498 for the three months ended September 30, 2023 and 2022, respectively, and $19,661 and $19,309 for the nine months ended September 30, 2023 and 2022, respectively.

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