| Property, Plant and Equipment, net |
Property, Plant and Equipment, netNet property, plant and equipment consisted of: | | | | | | | | | | | | | March 31, 2026 | | December 31, 2025 | | Machinery, equipment and tooling | $ | 50,736 | | | $ | 48,865 | | SmartSystems | 33,439 | | | 32,583 | | | Vehicles | 4,304 | | | 4,261 | | | Furniture and fixtures | 1,420 | | | 1,420 | | | Plant and buildings | 223,501 | | | 223,104 | | | Real estate properties | 7,760 | | | 7,738 | | | Railroad and sidings | 36,677 | | | 36,677 | | | Land and land improvements | 40,627 | | | 40,627 | | | Asset retirement obligations | 23,454 | | | 23,454 | | | Mineral properties | 7,442 | | | 7,442 | | | Deferred mining costs | 7,428 | | | 6,757 | | | Construction in progress | 3,987 | | | 2,541 | | | 440,775 | | | 435,469 | | | Less: accumulated depreciation and depletion | 218,414 | | | 212,215 | | | Total property, plant and equipment, net | $ | 222,361 | | | $ | 223,254 | |
Depreciation expense was $7,220 and $6,998 for the three months ended March 31, 2026 and 2025, respectively
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