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v3.25.2

Property, Plant and Equipment, net | 6 Months Ended
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Jun. 30, 2025
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | Property, Plant and Equipment, net Net property, plant and equipment consisted of:
| June 30, 2025 |  | December 31, 2024
Machinery, equipment and tooling | $ | 46,076 |  |  | $ | 43,041 |
SmartSystems | 32,583 |  |  | 32,551 |
Vehicles | 4,164 |  |  | 3,961 |
Furniture and fixtures | 1,420 |  |  | 1,368 |
Plant and building | 221,631 |  |  | 218,546 |
Real estate properties | 7,187 |  |  | 7,161 |
Railroad and sidings | 35,728 |  |  | 35,728 |
Land and land improvements | 40,627 |  |  | 40,627 |
Asset retirement obligations | 23,283 |  |  | 23,283 |
Mineral properties | 7,442 |  |  | 7,442 |
Deferred mining costs | 4,572 |  |  | 4,434 |
Construction in progress | 4,362 |  |  | 3,216 |
| 429,075 |  |  | 421,358 |
Less: accumulated depreciation and depletion | 198,348 |  |  | 184,666 |
Total property, plant and equipment, net | $ | 230,727 |  |  | $ | 236,692 |
Depreciation expense was $7,026 and $6,997 for the three months ended June 30, 2025 and 2024, respectively, and $14,024 and $13,978 for the six months ended June 30, 2025 and 2024, respectively.

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