2011-03-01_REVISION - M1977493 (6)

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Permit Amend. Climax Mine • CLIMAX MINE RECLAMATION COST ESTIMATE Financial Reporting Unit Rates Robinson Lake Assumptions: (1) Clean closure including removal of all known sources of contamination will be achieved, thereby rendering the water stored in the lake to be highly useable (2) Per Habitat, Exhibit E, AM06 application, Robinson Lake reclamation will involve (a) excavation of remaining sludge, and (b) biosolids application around the edge. (3) Revegetation is covered elsewhere. Tasks: Pre-Excavation Work and Water Management Sediment and Subsoil Removal Finish Work Timing Slimes only - 22% Lawrence 2008, 38% Skanska 2010, 10% Habitat 2010.11, balance 2011+ Total Cost $2,637,570 Calculations • 7asWArea # of Swell Hre CosttUnit Initial Volume Qty Units Production Units Total Equip Cost/Unit Cost/Unit Total Material Total Labor Cost Total Cost'. Equip Factor Rag'd Equip Cost Labor Materials Cost Pre-Excavation Work and Water Management $723,070.00 Sadl ment and Scbsoil Removal 07,000.00 $ Finch Work $1 $107,500.00 His Req'd Total Equip Cost Total Labor Cost TotalMatenal Cos' Total Cost TOTAL COSTS . $ 2,637;570 Lower Robinson Lake Cleanout actual costs from 2010 (Skanska) Do not use numbers for Habitat since their numbers are skewed resulting from their slimes failure and higher than typical costs (vs. Lawrence Constr. Co. in 2008 and Skanska in 2010) Description of Work Most Likely Cost in 12131/10 $ General Mobilization $269,000 Environmental - SPCC, Stormwater, 8 Dust Control $20,000 Clearing and Grubbing $10,000 Haul Roads $30,000 Demobilization $15,000 Subtotal $344,000 Pre-Excavation Work and Water Management Diversion, Dewatering and Un-watering $379,070 Subtotal $379,070 Sediment and Subsoil Removal Develop Access into Robinson Lake $15,000 Develop Access into Fill Area $10,000 Excavate and Haul Sediments to Fill Area (300K cy) $5.40 $1,620,000 Excavate, Haul and Place Native Materials (10% over-exc.) $162,000 Subtotal $1,807,000 Finish Work Final Recontounng at Robinson Lake $45,000 Final Recontouring at Fill Area $22,500 Regmde and Re-establish Cover on Face of 2-Dam to Pre-existing Condition $40,000 Subtotal $107,500 Total $2,637,570 Notes: Lawrence Constr. Co. - 4 months in 2008 Skanska - 3 months in 2010 Habitat - 4 months in 2010-2011 Slimes excavated = 220,000 cy Slimes excavated = 380,000 cy Slimes excavated = 100,000 cy max. EA,iGt L Feb 2011