Note 3 - Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

Schedule of property, plant, and equipment

(In thousands)	September 30, 2019		December 31, 2018
Plant and equipment	$	137,841	$	109,911
Construction in process		10,722		12,066
Capitalized mine development cost		53,482		43,037
Less: accumulated depreciation and amortization		(30,100)		(15,809)
Total property, plant and equipment, net	$	171,945	$	149,205

Schedule of depreciation and amortization

	Three months ended September 30,				Nine months ended September 30,
(In thousands)	2019		2018		2019		2018
Depreciation of plant and equipment	$	3,706	$	2,582	$	10,142	$	6,946
Amortization of capitalized
mine development costs		1,647		766		4,149		1,795
Total depreciation and amortization	$	5,353	$	3,348	$	14,291	$	8,741