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PROPERTY, PLANT AND EQUIPMENT (Tables) | 6 Months Ended
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Jun. 30, 2025
PROPERTY, PLANT AND EQUIPMENT |
Schedule of net book value of property, plant and equipment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Book Value of Property, Plant and Equipment at June 30, 2025
(thousands of dollars) |  | Alabama |  | Corporate |  | Total
Mineral rights and properties | ​ | $ | 8,972 | ​ | $ | — | ​ | $ | 8,972
Buildings | ​ | ​ | 3,183 | ​ | ​ | — | ​ | ​ | 3,183
Other property, plant and equipment | ​ |  | 3,984 | ​ |  | 11 | ​ |  | 3,995
Construction in progress | ​ | ​ | 123,075 | ​ | ​ | — | ​ | ​ | 123,075
Total | ​ | $ | 139,214 | ​ | $ | 11 | ​ | $ | 139,225
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Book Value of Property, Plant and Equipment at December 31, 2024
(thousands of dollars) |  | Alabama |  | Corporate |  | Total
Mineral rights and properties | ​ | $ | 8,972 | ​ | $ | — | ​ | $ | 8,972
Buildings | ​ | ​ | 3,243 | ​ | ​ | — | ​ | ​ | 3,243
Other property, plant and equipment | ​ |  | 2,364 | ​ |  | 13 | ​ |  | 2,377
Construction in progress | ​ | ​ | 123,276 | ​ | ​ | — | ​ | ​ | 123,276
Total | ​ | $ | 137,855 | ​ | $ | 13 | ​ | $ | 137,868

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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