Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Sales	$ 146,339	$ 193,560	$ 524,080	$ 622,395
Cost of sales and other direct production costs	104,900	112,542	326,579	318,917
Depreciation, depletion and amortization	32,992	45,790	106,362	138,918
Total cost of sales	137,892	158,332	432,941	457,835
Gross profit	8,447	35,228	91,139	164,560
Other operating expenses:
General and administrative	11,003	8,874	28,989	27,985
Exploration and pre-development	15,128	17,108	39,136	35,039
Care and maintenance costs	5,092	6,910	16,539	17,014
Provision for closed operations and environmental matters	1,781	7,564	4,154	12,297
Other operating expense	902	3,344	5,310	10,626
Total other operating expenses	33,906	43,800	94,128	102,961
(Loss) income from operations	(25,459)	(8,572)	(2,989)	61,599
Other income (expense):
Interest expense	(10,874)	(10,469)	(31,785)	(31,484)
Fair value adjustments, net	(4,240)	9,287	(14,703)	(10,651)
Net foreign exchange gain	5,667	3,995	8,111	24
Other income (expense)	1,853	247	4,828	(192)
Total other (expense) income	(7,594)	3,060	(33,549)	(42,303)
(Loss) income before income and mining taxes	(33,053)	(5,512)	(36,538)	19,296
Income and mining tax benefit	9,527	4,533	3,642	3,924
Net (loss) income	(23,526)	(979)	(32,896)	23,220
Preferred stock dividends	(138)	(138)	(414)	(414)
(Loss) income applicable to common stockholders	(23,664)	(1,117)	(33,310)	22,806
Comprehensive income (loss):
Net (loss) income	(23,526)	(979)	(32,896)	23,220
Change in fair value of derivative contracts designated as hedge transactions	(12,692)	(6,267)	19,491	(2,815)
Comprehensive (loss) income	$ (36,218)	$ (7,246)	$ (13,405)	$ 20,405
Basic (loss) income per common share after preferred dividends (in dollars per share)	$ (0.04)	$ 0	$ (0.06)	$ 0.04
Diluted (loss) income per common share after preferred dividends (in dollars per share)	$ (0.04)	$ 0	$ (0.06)	$ 0.04
Weighted average number of common shares outstanding – basic (in shares)	554,531	536,966	544,000	535,542
Weighted average number of common shares outstanding – diluted (in shares)	554,531	536,966	544,000	541,769
Cash dividends declared per common share (in dollars per share)	$ 0.00625	$ 0.01	$ 0.0125	$ 0.02