Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2023

Property, Plant and Equipment, Net

Schedule of components of property, plant and equipment

	March 31,		December 31,
	2023		2022
	(in thousands)
Mineral properties	$	9,353	$	9,353
Exploration properties		2,418		2,418
Royalty properties		200		200
Buildings		3,808		3,808
Mining equipment and machinery		17,074		17,127
Other furniture and equipment		1,377		1,355
Asset retirement cost		1,157		1,157
		35,387		35,418
Less: Accumulated depreciation and amortization		(29,104)		(29,002)
	$	6,283	$	6,416