PROPERTY, PLANT AND EQUIPMENT (Tables)

6 Months Ended

Jun. 30, 2023

PROPERTY, PLANT AND EQUIPMENT.

Net Book Value of Property, Plant and Equipment

	Net Book Value of Property Plant and Equipment at June 30, 2023
(thousands of dollars)	Alabama		Corporate		Total
Mineral rights and properties	$	8,972	$	—	$	8,972
Other property, plant and equipment		5,724		21		5,745
Construction in progress		109,017		—		109,017
Total	$	123,713	$	21	$	123,734

	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