Note 3 - Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2024

Property, Plant and Equipment.

Schedule of property, plant, and equipment, net

(In thousands)	September 30, 2024		December 31, 2023
Plant and equipment	$	323,440	$	290,060
Mining property and mineral rights		120,532		120,532
Construction in process		30,223		13,984
Capitalized mine development costs		186,843		174,260
Less: accumulated depreciation, depletion, and amortization		(184,290)		(139,745)
Total property, plant, and equipment, net	$	476,748	$	459,091

Schedule of depreciation and amortization

	Three months ended September 30,				Nine months ended September 30,
(In thousands)	2024		2023		2024		2023
Depreciation of plant and equipment	$	9,519	$	8,063	$	27,408	$	22,492
Amortization of right of use assets (finance leases)		2,648		2,432		8,025		6,312
Amortization and depletion of capitalized
mine development costs and mineral rights		5,644		3,948		13,476		11,046
Total depreciation, depletion, and amortization	$	17,811	$	14,443	$	48,909	$	39,850