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Note 3 - Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 2024
Notes to Financial Statements |
PROPERTY, PLANT AND EQUIPMENT | ​ NOTE 3—PROPERTY, PLANT AND EQUIPMENT Property, plant, and equipment, net consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​
(In thousands) |  | March 31, 2024 |  | December 31, 2023 | ​
Plant and equipment | ​ | $ | 296,837 | ​ | $ | 290,060 | ​
Mining property and mineral rights | ​ | ​ | 120,532 | ​ | ​ | 120,532 | ​
Construction in process | ​ |  | 23,010 | ​ |  | 13,984 | ​
Capitalized mine development costs | ​ |  | 178,171 | ​ |  | 174,260 | ​
Less: accumulated depreciation, depletion, and amortization | ​ |  | (152,297) | ​ |  | (139,745) | ​
Total property, plant, and equipment, net | ​ | $ | 466,253 | ​ | $ | 459,091 | ​
​ Depreciation, depletion, and amortization included: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended March 31, | ​
(In thousands) |  | 2024 |  | 2023 |
Depreciation of plant and equipment | ​ | $ | 8,821 | ​ | $ | 6,769 | ​
Amortization of right of use assets (finance leases) | ​ | ​ | 2,493 | ​ | ​ | 1,881 | ​
Amortization and depletion of capitalized | ​ | ​ | ​ | ​ | ​ | ​ | ​
mine development costs and mineral rights | ​ |  | 3,906 | ​ |  | 3,202 | ​
Total depreciation, depletion, and amortization | ​ | $ | 15,220 | ​ | $ | 11,852 | ​
​

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