Note 3 - Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2022

Property, Plant and Equipment.

Schedule of property, plant, and equipment

(In thousands)	September 30, 2022		December 31, 2021
Plant and equipment	$	203,529	$	167,019
Mining property and mineral rights		120,708		26,064
Construction in process		38,932		9,972
Capitalized mine development costs		145,304		104,291
Less: accumulated depreciation and amortization		(105,343)		(80,269)
Total property, plant and equipment, net	$	403,130	$	227,077

Schedule of depreciation and amortization

	Three months ended September 30,				Nine months ended September 30,
(In thousands)	2022		2021		2022		2021
Depreciation of plant and equipment	$	6,763	$	4,484	$	16,864	$	13,354
Depreciation of right of use assets (financing leases)		1,710		413		3,806		540
Amortization of capitalized
mine development costs		2,962		1,854		9,228		4,967
Total depreciation and amortization	$	11,435	$	6,751	$	29,898	$	18,861