| Schedule of Property, Plant, Equipment, and Mineral Properties |
Property, plant, equipment, and mineral properties were comprised of the following (in thousands): | | | | | | | | | | | | | | | | | September 30, 2026 | | December 31, 2025 | | Land | | $ | 519 | | | $ | 519 | | | Ponds and land improvements | | 87,863 | | | 87,881 | | | Mineral properties and development costs | | 157,704 | | | 155,221 | | | Buildings and plant | | 99,725 | | | 97,924 | | | Machinery and equipment | | 336,142 | | | 324,327 | | | Vehicles | | 8,387 | | | 8,061 | | | Office equipment and improvements | | 9,569 | | | 10,000 | | | Operating lease ROU assets | | 3,027 | | | 3,181 | | | | | | | | Construction in progress | | 22,060 | | | 13,925 | | | Total property, plant, equipment, and mineral properties, gross | | $ | 724,996 | | | $ | 701,039 | | | Less: accumulated depreciation, depletion, and amortization | | (427,518) | | | (402,283) | | | Total property, plant, equipment, and mineral properties, net | | $ | 297,478 | | | $ | 298,756 | |
|
| Schedule of Depreciation, Depletion and Accretion |
We incurred the following expenses for depreciation, depletion, and amortization, including expenses capitalized into inventory, for the following periods (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | | 2026 | | 2025 | | 2026 | | 2025 | | Depreciation | | $ | 8,364 | | | $ | 7,868 | | | $ | 24,869 | | | $ | 23,777 | | | Depletion | | 523 | | | 638 | | | 2,829 | | | 2,831 | | | Amortization | | 213 | | | 337 | | | 653 | | | 1,037 | | | Total incurred | | $ | 9,100 | | | $ | 8,843 | | | $ | 28,351 | | | $ | 27,645 | |
|