CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Sales, net	$ 21,098	$ 29,374	$ 49,103	$ 55,952
Depreciation and amortization	5,007	4,165	12,405	7,407
Reclamation and remediation	30	41	68	57
Total mine cost of sales	22,679	22,883	51,000	44,022
Mine gross profit	(1,581)	6,491	(1,897)	11,930
Costs and expenses:
General and administrative expenses	2,197	2,708	4,471	4,719
Other income, net	(1,847)	(107)	(334)	(82)
Total costs and expenses	901	3,232	5,843	6,718
(Loss) income before income taxes	(2,482)	3,259	(7,740)	5,212
Provision for income taxes	(670)	1,461	(2,807)	2,532
Net (loss) income	$ (1,812)	$ 1,798	$ (4,933)	$ 2,680
Net (loss) income per common share:
Basic and diluted	$ (0.03)	$ 0.03	$ (0.07)	$ 0.04
Weighted average shares outstanding:
Basic	69,985,499	62,778,445	68,011,860	61,729,871
Diluted	69,985,499	63,066,616	68,011,860	62,079,859
Production costs
Total mine cost of sales	$ 17,642	$ 18,677	$ 38,527	$ 36,558
Exploration expenses
Costs and expenses:
Total costs and expenses	$ 551	$ 631	$ 1,706	$ 2,081