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14 -N Cresson <br />North Cresson Mine Reclamation - Mass Earthwork, Growth Media Placement, and Revegetation <br />Footnotes for summary cost table: <br />'Assumes heavy grading will be done with conventional D10 or Dl idozers with U blades where the push distances are practical <br />Assumes fight grading will be done with a D9 dozer on the backfilled areas in Wiklhorse Extension area (rate • 2 hrs /acre) <br />3Growth Medium Replacement fleet will consist of three 623 Scrapers <br />°Growth Medium will be spread using a D-9 dozer to a depth of 6 inches <br />sSoil analyses will be run on samples of the reclaimed areas to determine optimum fertilizer rates <br />'Ripping and fertilizing will be conducted on the replaced growth medium using a conventional D4 dozer with a cyclone spreader <br />Seeding and harrowing will be conducted on all replaced growth medium that is traversible with conventional equipment <br />'Assumes approximately half the area will require hand - seeding to achieve revegetation <br />'Mulching will be conducted using conventional hydro- seederlhydro- nulcher <br />1OTrees and shrubs will be planted on north and east - facing slopes <br />"Supervisor costs are figured at 25 percent of the total work hours to accomplish the reclamation effort <br />Dozer Productivity <br />Calculation <br />for Heavy Grading <br />g <br />?„ <br />Qqtnfily <br />Comment <br />What is the Total Volume of backfilled rock to be graded? <br />2,207,847 <br />Reference Sheet 9 (Average of cutfii9 amounts) <br />1,856 <br />What is the average Haul Distance for all material? <br />100 <br />Feet per Drawing Sheet 9 <br />What is the thickness of growth medium replacement? <br />What is the volume if it ware all just 5 ft. grading 7 <br />2,207,847 <br />Calculated Volume = Area x 5 ft 127 <br />What is the expected average push distance for leveling piles? <br />100 <br />Short Doze to level out end-dumped truck loads <br />What is the job corection factor for the operator? <br />0.75 <br />Average Operator, Cat Hdbk, 33 Ed, pl42 <br />What Is the job correction factor for the material condition? <br />1.2 <br />Waste rock is loose, Cat Hdbk, 33 Ed, pl42 <br />What is the job correction factor for job efficiency? <br />0.83 <br />50 minutes operating per hour, Cat Hdbk, 33 Ed, p142 <br />What is the job correction factor for downhill grade pushing? <br />1.2 <br />Assume conservatively 10% grade, Cat Hdbk, 33 Ed, p142 <br />What is the job correction factor for side by side dozing ?_ <br />1.2 <br />Side-by side dozing, Cat Hdbk, 33 Ed,p142_ <br />_ _______________ _ _ _ _ _ _ _ _____________ - <br />!What is unadjusted production based on push distance for a D107 1,760 - cu ydslhr from Regression Equation Developed from Cat Handbook Version 39 <br />lCalculated adjusted production based on job factors = <br />1893.4 <br />cu ydslhr calculated <br />i- Calculated D10 Dozer hours In grading -- 1166.10 hours <br />- - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - J <br />iWhat is unadjusted production based on push distance for a of 17 <br />2,728 <br />cu yds1hr from Regression Equation Developed from Cat Handbook Version 39 i <br />,Calculated adjusted production based on job factors = <br />2934.1 <br />cu yds/hr calculated <br />lCalculated D10 Dozer grading - <br />752.48_ <br />_ _ _ _ ___ _______________________________ <br />-boom - _______ _ _ _ _ _ _ _ _ _hours_ <br />- - Mass Haul Productivity for Fill Earthwork Exceeding 6 ft. Heavy Dozer Leveling of Piles <br />Additional Volume that will be truck hauled <br />509.3 <br />0 Difference between Total Volume and the Volume for leveling 5 ft piles <br />What is the weighted average Haul Distance for the truck haul? <br />748.9 <br />0 Change in Moment arm by removing 5 ft, push = (VYHDt- Vd'HDdyVrem <br />What is loaded travel time based on haul distance & rolling resistance (min)? <br />377.4 <br />0.0 <br />What is empty travel time based on haul distance & rolling resistance (min)? <br />0.0 <br />0.0 <br />What is the manuever time for trucks at the loading area (min)? <br />Productivity by Regression Equation <br />0.70 <br />What is the length of time it takes a truck to dump (min)? <br />362.9 <br />1.00 <br />What is the capactiy of the selected truck (avg cu yds)? <br />64 <br />Calculated time for loading a truck (min) = <br />3.00 <br />Total Cycle Time (Maneuver + Load + Loaded Haul + Empty Haul + Dump) = <br />4.70 <br />Calculated number of truckloads per hour = <br />12.8 <br />What is the efficiency of the haulage effort expressed as minutes per hour? <br />55 <br />Calculated Productivity of Loaderrrruck Combination (cu yds/hour) = <br />748.9 <br />Total Fleet Hours Required <br />0.0 <br />What is the selected equipment to haul growth medium? <br />How many scrapers will be used? <br />Scraper Productivity <br />623 Scrapers <br />3 <br />Source Volume Haul Dist Prod Hours <br />g <br />?„ <br />GM1 178,000 2.318 180.961 984 <br />What is the area for growth medium replacement? <br />290.8 acres <br />GM4 <br />42,785 <br />1,856 <br />214.498 <br />199 <br />8 0 <br />What is the thickness of growth medium replacement? <br />0.5 feet <br />2,318 <br />1,856 <br />0 <br />0 <br />0 <br />a <br />Calculated quantity of growth medium required = <br />234,530 cu yds <br />1.6 <br />0.0 <br />0.0 <br />0 <br />0 <br />Empty Travel Time <br />0.8 <br />0.7 <br />0.0 <br />0.0 <br />0.0 <br />0 <br />0 <br />io <br />TotalfAverage <br />220,785 <br />2,228 <br />181 <br />1,183 <br />Truckloads per hour <br />8.0 <br />777F Haul Truck Productivity <br />Source 1 <br />Source 2 <br />Source 3 <br />Source 4 <br />Source 5 <br />Total Fleet Hours <br />Haul Distance <br />2,318 <br />1,856 <br />0 <br />0 <br />0 <br />Loaded Travel Time <br />1.9 <br />1.6 <br />0.0 <br />0.0 <br />0.0 <br />Regression at 1307.7 feet per min - 6% grade <br />Empty Travel Time <br />0.8 <br />0.7 <br />0.0 <br />0.0 <br />0.0 <br />Regression at 2,724 feet per min -6 % grade <br />Total Cycle Time <br />7.5 <br />6.9 <br />4.7 <br />4.7 <br />4.7 <br />Truckloads per hour <br />8.0 <br />8.7 <br />12.8 <br />12.8 <br />12.8 <br />Productivity <br />471.7 <br />509.3 <br />748.9 <br />748.9 <br />748.9 <br />478.5 <br />Fleet Hours Required <br />377.4 <br />84.0 <br />0.0 <br />0.0 <br />0.0 <br />461.4 <br />Productivity by Regression Equation <br />320.0 <br />328.6 <br />362.9 <br />362.9 <br />362.9 <br />