PROPERTY, PLANT AND EQUIPMENT (Tables)

3 Months Ended

Mar. 31, 2023

PROPERTY, PLANT AND EQUIPMENT.

Net Book Value of Property, Plant and Equipment

	Net Book Value of Property Plant and Equipment at March 31, 2023
(thousands of dollars)	Alabama		Corporate		Total
Mineral rights and properties	$	8,972	$	—	$	8,972
Other property, plant and equipment		5,711		22		5,733
Construction in progress		101,328		—		101,328
Total	$	116,011	$	22	$	116,033

	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