PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Net Book Value of Property, Plant and Equipment

	Net Book Value of Property, Plant and Equipment at December 31, 2023
(thousands of dollars)	Alabama		Corporate		Total
Mineral rights and properties	$	8,972	$	—	$	8,972
Other property, plant and equipment		5,845		18		5,863
Construction in progress		117,565		—		117,565
Total	$	132,382	$	18	$	132,400

	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