PROPERTY, PLANT AND EQUIPMENT (Tables)

9 Months Ended

Sep. 30, 2021

PROPERTY, PLANT AND EQUIPMENT.

Net Book Value of Property, Plant and Equipment

	Net Book Value of Property Plant and Equipment at September 30, 2021
(thousands of dollars)	Alabama		Corporate		Total
Mineral rights and properties	$	8,972	$	—	$	8,972
Other property, plant and equipment		1,378		30		1,408
Construction in progress		100		—		100
Total	$	10,450	$	30	$	10,480

	Net Book Value of Property Plant and Equipment at December 31, 2020
(thousands of dollars)	Alabama		Corporate		Total
Mineral rights and properties	$	8,972	$	—	$	8,972
Other property, plant and equipment		—		13		13
Total	$	8,972	$	13	$	8,985