PROPERTY, PLANT AND EQUIPMENT (Tables)

9 Months Ended

Sep. 30, 2023

PROPERTY, PLANT AND EQUIPMENT.

Net Book Value of Property, Plant and Equipment

	Net Book Value of Property, Plant and Equipment at September 30, 2023
(thousands of dollars)	Alabama		Corporate		Total
Mineral rights and properties	$	8,972	$	—	$	8,972
Other property, plant and equipment		5,742		19		5,761
Construction in progress		115,222		—		115,222
Total	$	129,936	$	19	$	129,955

	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