Property, Plant and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment, Net

Schedule of components of property, plant and equipment

	December 31,		December 31,
	2019		2018
	(in thousands)
Mineral properties	$	9,353	$	9,353
Exploration properties		2,518		2,518
Royalty properties		200		200
Buildings		3,755		4,278
Mining equipment and machinery		16,049		16,024
Other furniture and equipment		884		888
Asset retirement cost		866		866
		33,625		34,127
Less: Accumulated depreciation and amortization		(27,594)		(27,018)
	$	6,031	$	7,109