PROPERTY, PLANT AND EQUIPMENT

9 Months Ended

Sep. 30, 2023

PROPERTY, PLANT AND EQUIPMENT.

PROPERTY, PLANT AND EQUIPMENT

3. 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

Construction in Progress

Construction in progress represents assets that are not ready for service or are in the construction stage. Assets are depreciated based on the estimated useful life of the asset once it is placed in service.

Impairment of Property, Plant and Equipment

The Company reviews and evaluates its long-lived assets for impairment on an annual basis or more frequently when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. For the nine months ended September 30, 2023, no events or changes in circumstance are believed to have impacted recoverability of the Company’s long-lived assets. Accordingly, it was determined that no interim impairment was necessary.  As discussed in Note 2, if the Company is required to abandon construction and development or alter its intended long-term plans related to the Kellyton Graphite Plant, the Company could be required to evaluate the recoverability of its long-lived assets.