PROPERTY, PLANT AND EQUIPMENT (Tables)

3 Months Ended

Mar. 31, 2022

Property, Plant and Equipment [Abstract]

Schedule of Plant, Pipeline and Equipment

Property, plant and equipment consisted of the following:
	March 31, 2022		December 31, 2021
	(thousands of dollars)
Platinum catalyst metal	$	1,478	$	1,478
Catalyst	4,325		4,325
Land	5,400		5,428
Plant, pipeline and equipment	286,491		282,780
Construction in progress	7,901		7,213
Total property, plant and equipment	$	305,595	$	301,224
Less accumulated depreciation	(119,566)		(115,703)
Total property, plant and equipment, net	$	186,029	$	185,521