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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2022
PROPERTY, PLANT AND EQUIPMENT. |
Net Book Value of Property, Plant and Equipment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Book Value of Property Plant and Equipment at December 31, 2022
(thousands of dollars) |  | Alabama |  | Corporate |  | Total
Mineral rights and properties | ​ | $ | 8,972 | ​ | $ | — | ​ | $ | 8,972
Other property, plant and equipment | ​ |  | 5,745 | ​ |  | 24 | ​ |  | 5,769
Construction in progress | ​ | ​ | 75,337 | ​ | ​ | — | ​ | ​ | 75,337
Total | ​ | $ | 90,054 | ​ | $ | 24 | ​ | $ | 90,078
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Book Value of Property Plant and Equipment at December 31, 2021
(thousands of dollars) |  | Alabama |  | Corporate |  | Total
Mineral rights and properties | ​ | $ | 8,972 | ​ | $ | — | ​ | $ | 8,972
Other property, plant and equipment | ​ |  | 4,462 | ​ |  | 28 | ​ |  | 4,490
Construction in progress | ​ | ​ | 1,017 | ​ | ​ | — | ​ | ​ | 1,017
Total | ​ | $ | 14,451 | ​ | $ | 28 | ​ | $ | 14,479
​

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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