PROPERTY, PLANT AND EQUIPMENT (Tables)

6 Months Ended

Jun. 30, 2022

PROPERTY, PLANT AND EQUIPMENT.

Net Book Value of Property, Plant and Equipment

	Net Book Value of Property Plant and Equipment at June 30, 2022
(thousands of dollars)	Alabama		Corporate		Total
Mineral rights and properties	$	8,972	$	—	$	8,972
Other property, plant and equipment		5,686		27		5,713
Construction in progress		28,991		—		28,991
Total	$	43,649	$	27	$	43,676

	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