PROPERTY, PLANT AND EQUIPMENT

6 Months Ended

Jun. 30, 2022

PROPERTY, PLANT AND EQUIPMENT.

PROPERTY, PLANT AND EQUIPMENT

3. PROPERTY, PLANT AND EQUIPMENT

	Net Book Value of Property Plant and Equipment at June 30, 2022
(thousands of dollars)	Alabama		Corporate		Total
Mineral rights and properties	$	8,972	$	—	$	8,972
Other property, plant and equipment		5,686		27		5,713
Construction in progress		28,991		—		28,991
Total	$	43,649	$	27	$	43,676

	Net Book Value of Property Plant and Equipment at December 31, 2021
(thousands of dollars)	Alabama		Corporate		Total
Mineral rights and properties	$	8,972	$	—	$	8,972
Other property, plant and equipment		4,462		28		4,490
Construction in progress		1,017		—		1,017
Total	$	14,451	$	28	$	14,479

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.

During the first quarter of 2022, the manufacturing of certain equipment commenced, for which the Company made cash deposits of $2.7 million as of December 31, 2021.  As such, the deposits as of December 31, 2021 are now reflected as construction in progress, and will continue to be included in construction in progress until such assets are placed into 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 six months ended June 30, 2022, 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.