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Consolidated Balance Sheets - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 129,830 | $ 62,452
Accounts receivable: |  |
Trade | 27,864 | 11,952
Taxes | 1,584 | 20,048
Other, net | 9,745 | 6,421
Inventories: |  |
Concentrates, doré, stockpiled ore, and metals in transit and in-process | 57,936 | 30,364
Materials and supplies | 38,608 | 35,849
Other current assets | 19,114 | 12,038
Total current assets | 284,681 | 179,124
Investments | 15,148 | 6,207
Restricted cash and investments | 1,053 | 1,025
Properties, plants, equipment and mineral interests, net | 2,345,219 | 2,423,698
Operating lease right-of-use assets | 10,628 | 16,381
Deferred income taxes | 2,912 | 3,537
Other non-current assets | 8,083 | 7,336
Total assets | 2,667,724 | 2,637,308
Current liabilities: |  |
Accounts payable and accrued liabilities | 68,516 | 57,716
Accrued payroll and related benefits | 31,807 | 26,916
Accrued taxes | 8,349 | 4,776
Finance leases | 6,491 | 5,429
Operating leases | 3,008 | 5,580
Accrued reclamation and closure costs | 5,582 | 4,581
Accrued interest | 14,157 | 5,804
Current derivative liabilities | 11,737 | 6,170
Other current liabilities | 138 | 2
Total current liabilities | 149,785 | 116,974
Finance leases | 9,274 | 7,214
Operating leases | 7,634 | 10,818
Accrued reclamation and closure costs | 110,466 | 103,793
Long-term debt | 507,242 | 504,729
Deferred tax liability | 132,475 | 138,282
Pension liability | 44,144 | 56,219
Other non-current liabilities | 4,364 | 6,856
Total liabilities | 965,384 | 944,885
Commitments and contingencies (Notes 3, 4, 5, 7, 8, 9, and 11) |  |
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, authorized 750,000,000 shares; issued 2020 — 538,487,415 shares and 2019 — 529,182,994 shares | 134,629 | 132,292
Capital surplus | 2,003,576 | 1,973,700
Accumulated deficit | (379,519) | (353,331)
Accumulated other comprehensive loss, net | (32,889) | (37,310)
Less treasury stock, at cost; 2020 — 6,821,044 and 2019 — 6,287,271 shares issued and held in treasury | (23,496) | (22,967)
Total stockholders’ equity | 1,702,340 | 1,692,423
Total liabilities and stockholders’ equity | $ 2,667,724 | $ 2,637,308

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- Definition Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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