Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 212,029	$ 210,010
Accounts receivable:
Trade	33,324	36,437
Other, net	8,586	8,149
Inventories:
Concentrates, doré, and stockpiled ore	29,852	25,906
Materials and supplies	43,238	41,859
Other current assets	16,927	19,266
Total current assets	343,956	341,627
Investments	29,204	10,844
Restricted cash and investments	1,041	1,053
Properties, plants, equipment and mineral interests, net	2,298,858	2,310,810
Operating lease right-of-use assets	12,342	12,435
Deferred taxes	45,562	45,562
Other non-current assets	7,936	6,477
Total assets	2,738,899	2,728,808
Current liabilities:
Accounts payable and accrued liabilities	73,786	68,100
Accrued payroll and related benefits	34,864	28,714
Accrued taxes	16,128	12,306
Finance and operating leases	8,535	8,098
Accrued reclamation and closure costs	10,594	9,259
Accrued interest	5,232	14,454
Derivatives liabilities	38,992	19,353
Other current liabilities	109	99
Total current liabilities	188,240	160,383
Finance and operating leases	18,385	17,726
Accrued reclamation and closure costs	103,612	103,972
Long-term debt	508,852	508,095
Deferred tax liability	140,810	149,706
Derivatives liabilities	43,402	18,528
Other non-current liabilities	7,055	9,611
Total liabilities	1,010,356	968,021
Commitments and contingencies (Notes 4, 7, 8, and 10)
Common stock, $0.25 par value, 750,000,000 authorized shares; issued March 31, 2022 — 546,635,233 shares and December 31, 2021 — 545,534,760 shares	136,657	136,391
Capital surplus	2,036,417	2,034,485
Accumulated deficit	(353,007)	(353,651)
Accumulated other comprehensive loss	(61,621)	(28,456)
Less treasury stock, at cost; March 31, 2022 — 7,728,800 shares and December 31, 2021 - 7,395,295 shares issued and held in treasury	(29,942)	(28,021)
Total stockholders’ equity	1,728,543	1,760,787
Total liabilities and stockholders’ equity	2,738,899	2,728,808
Series B Preferred Stock [Member]
Current liabilities:
Preferred stock, 5,000,000 shares authorized: Series B preferred stock, $0.25 par value, 157,816 shares issued and outstanding, liquidation preference — $7,891	$ 39	$ 39