PROPERTY, PLANT AND EQUIPMENT

3 Months Ended

Mar. 31, 2021

PROPERTY, PLANT AND EQUIPMENT.

PROPERTY, PLANT AND EQUIPMENT

5. PROPERTY, PLANT AND EQUIPMENT

	Net Book Value of Property, Plant and Equipment at March 31, 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 three months ended March 31, 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.