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PROPERTY, PLANT AND EQUIPMENT | 6 Months Ended
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Jun. 30, 2021
PROPERTY, PLANT AND EQUIPMENT. |
PROPERTY, PLANT AND EQUIPMENT | 5. PROPERTY, PLANT AND EQUIPMENT ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Book Value of Property, Plant and Equipment at June 30, 2021
(thousands of dollars) |  | Alabama |  | Corporate |  | Total
Mineral rights and properties | ​ |  | 8,972 | ​ |  | — | ​ |  | 8,972
Other property, plant and equipment | ​ |  | — | ​ |  | 11 | ​ |  | 11
Total | ​ | $ | 8,972 | ​ | $ | 11 | ​ | $ | 8,983
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Book Value of Property, Plant and Equipment at December 31, 2020
(thousands of dollars) |  | Alabama |  | Corporate |  | Total
Mineral rights and properties | ​ |  | 8,972 | ​ |  | — | ​ |  | 8,972
Other property, plant and equipment | ​ |  | — | ​ |  | 13 | ​ |  | 13
Total | ​ | $ | 8,972 | ​ | $ | 13 | ​ | $ | 8,985
​ Impairment of Property, Plant and Equipment ​ The Company reviews and evaluates its long-lived assets for impairment on an annual basis or more frequently when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. For the six months ended June 30, 2021, no events or changes in circumstance are believed to have impacted recoverability of the Company’s long-lived assets. Accordingly, it was determined that no interim impairment was necessary. ​

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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