2012-01-20_HYDROLOGY - M1985112 (2)

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Clay Core Material CY 567886.4 $2.25 $1,277,744 40 A clay liner must be keyed into bedrock in order to be effective. This estimate assumes a minimum zoned clay liner configuration that is keyed into the bedrock This zoned liner configuration assumes a 12 foot top width and a 21 slope It also assumes the mining highwall is 0 5 1 Embankment Shell CY 378590.9 $1.25 $473,238.63 Assumes only the backfilled portion of the embankment (20 feet) to be seeded. Removal of Excess Material (Below 40 feet) to Bedrock CY 884671.3 $9.00 $7,962,041.70 If mining is only feasible to 40 feet, the remaining 11 feet (average additional depth to bedrock) must be excavated and removed from the site to key clay liner into bedrock Seed and Mulch Ac 3.4 $675.00 $2,295.00 Assumes only the backfilled portion of the embankment (25 feet) to be seeded Reseed (Assume 20% Reseed) Ac 0.7 $675.00 $459 00 Dewatering Monthly 360.0 $10,000.00 $3,600,000 00 Assumes a 30 year mining and reclamation to install clay liner Pumping costs do combine costs associated with mining as well as costs associated with reclamation. Actual costs for pumping exclusively for installation of clay liner may be significantly less than this estimate Geotechnical 1.0 $10,000.00 $10,00000 Subtotal $13,325,778 73 Engineering (10%) $1,332,577.87 Mobilization (5 %) $666,288 94 Construction Observation (10%) $1,332,577.87 Testing (2 %) $266,515.57 Construction Staking (1 %) $133,257 79 Contingency (30%) $3,997,733 62 TOTAL $21,054,730.39 Slurry Wall Sq -Ft 347014.0 $3.50 $1,214,549.00 Estimate based on vertical slurry wall to 7 feet below bedrock Average bedrock assumed to be 51 feet based on Empire Laboratories Report of a Mineral Evaluation (Feb 9, 1981) Dewatering Monthly 1.0 $10,000.00 $10,000.00 Backfilling to a 3 1 Slope CY 664777.8 $1.25 $830,972.25 This assumes a 25 foot top width Seed and Mulch Ac 3.4 $675.00 $2,295.00 Assumes only the backfilled portion of the embankment (25 feet) to be seeded. Reseed (Assume 20% Reseed) Ac 0.7 $675.00 $459.00 Geotechnical 1.0 $10,000.00 $10,000 00 Subtotal $2,068,275 25 Engineering (10%) $206,827.53 Mobilization (5 %) $103,413.76 Construction Observation (10%) $206,827.53 Testing (2 %) $41,36551 Construction Staking (1 %) $20,682 75 Contingency (30%) $620,482 58 TOTAL $3,267,874.90 Loloff Pit Preliminary Cost Estimate Slurry Wall and Zoned Clay Liner Reservoir Engineer's Opinion of Probable Cost DESCRIPTION Slurry Wall Option Clay Liner Option TM:" Appl Group, UNIT TYPE Units UNIT COST ESTIMATED COST Notes