| PROPERTY, PLANT AND EQUIPMENT |
NOTE 4—PROPERTY, PLANT AND EQUIPMENT Property, plant, and equipment, net consisted of the following: | | | | | | | | | | (In thousands) | | June 30, 2026 | | December 31, 2025 | Plant and equipment | | $ | 378,177 | | $ | 390,359 | Mining property and mineral rights | | | 139,232 | | | 139,077 | Construction in process | | | 37,476 | | | 22,264 | Capitalized mine development costs | | | 237,160 | | | 221,852 | Less: accumulated depreciation, depletion, and amortization | | | (258,845) | | | (261,609) | Total property, plant, and equipment, net | | $ | 533,200 | | $ | 511,943 |
Depreciation, depletion, and amortization included: | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three months ended June 30, | | Six months ended June 30, | (In thousands) | | 2026 | | 2025 | | 2026 | | 2025 | Depreciation of plant and equipment | | $ | 11,192 | | $ | 10,893 | | $ | 22,422 | | $ | 21,258 | Amortization of right of use assets (finance leases) | | | 1,762 | | | 2,002 | | | 3,461 | | | 3,894 | Amortization and depletion of capitalized | | | | | | | | | | | | | mine development costs and mineral rights | | | 3,857 | | | 4,143 | | | 7,541 | | | 9,428 | Total depreciation, depletion, and amortization | | $ | 16,811 | | $ | 17,038 | | $ | 33,424 | | $ | 34,580 |
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