Financial Liquidity and Capital Resources (1) Various accidents and other events resulted in temporary suspensions of production at the Lucky Friday unit during 2011 and throughout 2012. See the Lucky Friday Segment section for further  discussion. Care-and-maintenance, mine rehabilitation, investigation, and other costs incurred during the suspension periods not related to production have been excluded from total cash costs and the  calculation of total cash cost per silver ounce produced. Our liquid assets include (in millions): 28 [ HL:10-K ]  December 31, 2012 2011 2010 Cash and cash equivalents held in U.S. dollars  $  190.5  $  266.4  $  283.1  Cash and cash equivalents held in foreign currency  0.4  0.1  0.5  Marketable equity securities, current  — — 1.5 Marketable equity securities, non-current  9.6  3.9  1.2  Total cash, cash equivalents and investments  $ 200.5  $ 270.4  $ 286.3  Lucky Friday Unit  Year ended December 31,  2012 2011 2010 Total cash costs $ — $ 19,321 $ 12,638 Divided by silver ounces produced  —  2,985  3,359  Total cash cost per silver ounce produced  $ —  $ 6.47  $ 3.76  Reconciliation to GAAP:  Total cash costs $ — $ 19,321 $ 12,638 Depreciation, depletion and amortization — 6,053 8,340 Treatment costs — (19,885) (18,327) By-product credits — 48,411 52,810 Change in product inventory — 161 (25) Suspension-related costs  (1) — 4,135 — Reclamation and other costs  —  37  63  Cost of sales and other direct production costs and depreciation, depletion and amortization (GAAP) $ —  $ 58,233  $ 55,499  Greens Creek Unit  Year ended December 31,  2012 2011 2010 Total cash costs $ 17,262 $ (8,387) $ (28,073) Divided by silver ounces produced  6,394  6,498  7,207  Total cash cost per silver ounce produced  $ 2.70  $ (1.29)  $ (3.90) Reconciliation to GAAP:  Total cash costs $ 17,262 $ (8,387) $ (28,073) Depreciation, depletion and amortization 43,522 41,013 51,671 Treatment costs (73,355) (79,134) (73,817) By-product credits 190,916 205,961 214,462 Change in product inventory (1,381) (4,966) 3,685 Reclamation and other costs  663  (81)  567  Cost of sales and other direct production costs and depreciation, depletion and amortization (GAAP) $ 177,627  $ 154,406  $ 168,495  Total, All Properties  Year ended December 31,  2012 2011 2010 Total cash costs $ 17,262 $ 10,934 $ (15,435) Divided by silver ounces produced  6,394  9,483  10,566  Total cash cost per silver ounce produced  $ 2.70  $ 1.15  $ (1.46) Reconciliation to GAAP:  Total cash costs $ 17,262 $ 10,934 $ (15,435) Depreciation, depletion and amortization 43,522 47,066 60,011 Treatment costs (73,355) (99,019) (92,144) By-product credits 190,916 254,372 267,272 Change in product inventory (1,381) (4,805) 3,660 Suspension-related costs  (1) — 4,135 — Reclamation and other costs  663  (44)  630  Cost of sales and other direct production costs and depreciation, depletion and amortization (GAAP) $ 177,627  $ 212,639  $ 223,994 