Note 3 - Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2022

Property, Plant and Equipment.

Schedule of property, plant, and equipment

(In thousands)	June 30, 2022		December 31, 2021
Plant and equipment	$	187,781	$	167,019
Mining property and mineral rights		90,081		26,064
Construction in process		32,659		9,972
Capitalized mine development costs		126,693		104,291
Less: accumulated depreciation and amortization		(95,618)		(80,269)
Total property, plant and equipment, net	$	341,596	$	227,077

Schedule of depreciation and amortization

	Three months ended June 30,				Six months ended June 30,
(In thousands)	2022		2021		2022		2021
Depreciation of plant and equipment	$	5,346	$	4,471	$	10,100	$	8,870
Depreciation of right of use assets		1,383		127		2,097		127
Amortization of capitalized
mine development costs		3,054		1,357		6,266		3,113
Total depreciation and amortization	$	9,783	$	5,955	$	18,463	$	12,110