Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Sales of products	$ 186,499	$ 210,852
Cost of sales and other direct production costs	105,772	96,382
Depreciation, depletion and amortization	35,298	47,069
Total cost of sales	141,070	143,451
Gross profit	45,429	67,401
Other operating expenses:
General and administrative	8,294	8,007
Exploration and pre-development	12,808	6,690
Care and maintenance	6,205	4,318
Provision for closed operations and reclamation	901	3,709
Other operating expense	2,463	3,648
Total other operating expense	30,671	26,372
Income from operations	14,758	41,029
Other income (expense):
Interest expense	(10,406)	(10,744)
Fair value adjustments, net	(5,965)	1,875
Net foreign exchange loss	2,038	2,064
Other non-operating income (expense)	(1,505)	152
Total other expense	(4,974)	(14,835)
Income before income and mining taxes	9,784	26,194
Income and mining tax provision	(5,631)	(4,743)
Net income	4,153	21,451
Preferred stock dividends	(138)	(138)
Income applicable to common stockholders	4,015	21,313
Comprehensive income:
Net income	4,153	21,451
Change in fair value of derivative contracts designated as hedge transactions	(33,165)	1,832
Comprehensive (loss) income	$ (29,012)	$ 23,283
Basic income per common share after preferred dividends (in dollars per share)	$ 0.01	$ 0.04
Diluted income per common share after preferred dividends (in dollars per share)	$ 0.01	$ 0.04
Weighted average number of common shares outstanding - basic (in shares)	538,490	534,101
Weighted average number of common shares outstanding - diluted (in shares)	544,061	540,527
Cash dividends per common share (in dollars per share)	$ 0.00625	$ 0.00875