2008-12-19_REVISION - M1980244 (7)

Home Browse Search

Footnotes for summary cost table 'Assumes heavy grading will be done with conventional D11 dozers with U blades where the push distances are practical 2Assumes light grading will be done with a 09 dozer on the backfilled areas in Schist Island / Globe Hill pit areas (rate = 2 hrs/acre) GGrowth Medium Replacement fleet will 623 Scrapers, 14G grader, and 5000 gal water truck 'Growth Medium will be spread using a D-9 dozer to a depth of 6 inches 5Soil analyses will be run on samples of the reclaimed areas to determine optimum fertilizer rates 'Ripping and fertilizing will be conducted on the replaced growth medium using a conventional D4 dozer with a cyclone spreader 'Seeding and harrowing will be conducted on all replaced growth medium that is traversible with conventional equipment 8Mulching will be conducted using conventional hydro-seeder/hydro-mulcher 9Mulching will be conducted using conventional hydro-seeder/hydro-mulcher 1OTree planting costs are included under N Cresson Viewshed Conservation Plan costs "Supervisor costs are figured at 25 percent of the total work hours to accomplish the reclamation effort North Cresson Mine Reclamation Costs (2008 (Includes Schist Island and Globe Hill Pits) Acreage Input Table Pit Number Units Comment Light Grading 92 ac Reclamation Map GM placement 110 ac Reclamation Map North Cresson Mine Backfill Dozer Productivity in Re-contouring Assumptions: For volume calculation assume that 60% of the recountour is for a 315 ft dump height and 40% is for a 250 ft dump height with 3,150 linear ft of recontour. Quantity Comment What is the volume of backfilled rock to be graded? 1,073,333 cu yds What is the weighted average push distance for the dozer? What is the job correction factor for the operator? What is the job correction factor for the material condition? What is the job correction factor for job efficiency? What is the job correction factor for downhill grade pushing? What is the job correction factor for side by side dozing? What is the dozer unit and blade type selected? What is unadjusted production based on push distance? Calculated adjusted production based on job factors = Calculated D11 Dozer hours in grading = Grading and Recontouring Backfilled Areas What is the area to be light graded with a dozer? What is the rate selected for light grading? What dozer will be used for light grading? What is the selected equipment to haul growth medium? How many scrapers will be used? What is the area for growth medium replacement? What is the thickness of growth medium replacement? Calculated quantity of growth medium required = What is quantity/haul distance/productivity from E. Cresson? Similar productivity as Squaw OSA 0.75 Average Operator, Cat Hdbk, 33 Ed, pt-42 1.2 Waste rock is loose, Cat Hdbk, 33 Ed, p1-42 0.83 50 minutes operating per hour, Cat Hdbk, 33 Ed, p1-42 12 Assume conservatively 10% grade, Cat Hdbk, 33 Ed, p1-42 1.2 Side by side dozing, Cat Hdbk, 33 Ed, p1-42 D10 U-Blade 800 cu yds/hr from Estimated Dozing Prod. Chart, Cat Hdbk, 33 Ed, p1-39 860.5 cu yds/hr calculated 1247.27 hours North Cresson Mine Growth Medium Activity Quantity Units Comment 92.0 acres measured fr. topo map & air photo 2 hrs/acre MDE assumption D9 623 Scrapers 110.0 acres 0.5 feet 88,715 cu yds 88,715 cu yds North Cresson Mine Revegetation How many acres will receive fertilizing and ripping simultanesouly with a D4 dozer? How many acres will receive seeding & harrowing simultanesouly with a D4 dozer? How many acres will receive tree planting? Tree planting calculated in Viewshed Conservation Costs 'Estimated from the 2008 Growth Medium Stockpile Map 2From the Scraper Production Graph MDE assumption Scraper Haul Distance' Productivity2 Hours 5,000 feet 148 cy/hr 599.43 110.0 acres 110.0 acres - acres MDE (2-25-08) Rev (4-3-08) & (4-11-08) Rev. TJC 11-17-08