Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 139,750	$ 129,830
Accounts receivable:
Trade	35,274	27,864
Other, net	8,475	11,329
Inventories:
Concentrates, doré, and stockpiled ore	56,917	57,936
Materials and supplies	37,335	38,608
Derivatives assets	7,195	3,470
Other current assets	12,971	15,644
Total current assets	297,917	284,681
Investments	11,717	15,148
Restricted cash and investments	1,053	1,053
Properties, plants, equipment and mineral interests, net	2,320,547	2,345,219
Operating lease right-of-use assets	9,775	10,628
Deferred taxes	3,886	2,912
Derivatives assets	6,346	4,558
Other non-current assets	3,836	3,525
Total assets	2,655,077	2,667,724
Current liabilities:
Accounts payable and accrued liabilities	53,130	68,516
Accrued payroll and related benefits	22,800	31,807
Accrued taxes	7,854	8,349
Finance leases	6,706	6,491
Operating leases	2,832	3,008
Accrued reclamation and closure costs	6,592	5,582
Accrued interest	5,175	14,157
Derivatives liabilities	3,906	11,737
Other current liabilities	123	138
Total current liabilities	109,118	149,785
Finance leases	10,304	9,274
Operating leases	6,954	7,634
Accrued reclamation and closure costs	113,671	110,466
Long-term debt	507,992	507,242
Deferred tax liability	149,220	144,330
Pension liability	28,797	44,144
Other non-current liabilities	4,146	4,364
Total liabilities	930,202	977,239
Commitments and contingencies (Notes 4, 7, 8, and 10)
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
Common stock, $0.25 par value, 750,000,000 authorized shares; issued March 31, 2021 — 542,154,997 shares and December 31, 2020 — 538,487,415 shares	135,546	134,629
Capital surplus	2,021,072	2,003,576
Accumulated deficit	(377,229)	(391,374)
Accumulated other comprehensive loss	(31,057)	(32,889)
Less treasury stock, at cost; March 31, 2021 and December 31, 2020 - 6,821,044 shares issued and held in treasury	(23,496)	(23,496)
Total stockholders’ equity	1,724,875	1,690,485
Total liabilities and stockholders’ equity	$ 2,655,077	$ 2,667,724