PROPERTY, PLANT AND EQUIPMENT (Tables)

3 Months Ended

Mar. 31, 2022

PROPERTY, PLANT AND EQUIPMENT.

Net Book Value of Property, Plant and Equipment

	Net Book Value of Property Plant and Equipment at March 31, 2022
(thousands of dollars)	Alabama		Corporate		Total
Mineral rights and properties	$	8,972	$	—	$	8,972
Other property, plant and equipment		4,525		28		4,553
Construction in progress		18,138		—		18,138
Total	$	31,635	$	28	$	31,663

	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