PROPERTY, PLANT AND EQUIPMENT (Tables)

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Schedule of Plant, Pipeline and Equipment

Property, plant and equipment consisted of the following:
	June 30, 2021		December 31, 2020
	(thousands of dollars)
Platinum catalyst metal	$	1,553	$	1,580
Catalyst	4,325		4,325
Land	5,428		5,428
Plant, pipeline and equipment	276,223		270,149
Construction in progress	9,041		6,422
Total property, plant and equipment	$	296,570	$	287,904
Less accumulated depreciation	(108,461)		(100,800)
Total property, plant and equipment, net	$	188,109	$	187,104