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16- ArequaVLF
<br />Arequa Gulch VLF - Chemical Closure and Reclamation Costs
<br />2014 Reclamation (Earthwork) for AGVLF This section was revised by MDE (3 -7 -14)
<br />Assumotlons
<br />Fence removal cost =
<br />$ 2.98 Cost per Foot, Means 2014, p. 33
<br />Remove fencing and pipelines
<br />I
<br />24" Steel pipe removal cost =
<br />$ 29.20 Cost per Foot, Means 2014, p. 28
<br />I
<br />Haul and grade leach materials to achieve final contours
<br />30" Steel pipe removal cost =
<br />$ 21.90 Cost per Foot, Means 2014, p. 28
<br />Replace gr. medium to a depth of 6 inches and revegetate
<br />What is the area of AGVLF?
<br />588.3 acres
<br />Footprint in reclamation estimate extends out particularly to the north over op footprint
<br />What is the length of the permeter fencing to be removed?
<br />3,450 feet
<br />increase from 2,500 in 2007 (ratio used = 501.5/363.5 = 1.38)
<br />What is the length of the piping (30" dia) to be removed?
<br />6,900 feet
<br />increased from 5,000 in 2007 (ratio used = 501.5/363.5 = 1.38)
<br />What is the length of the piping (24" dia) to be removed?
<br />21,200 feet
<br />increased from 15,700 in 2007 (ratio used = 501.5/363.5 = 1.36)
<br />What is the volume of material to push with dozers to achieve final contours?
<br />10,640,000 cy
<br />(See Final Surface & Volumes Dwg., Balanced AGVLF2.pdf) [compare with 1.2 million in 2007]
<br />What is the average length of push to achieve final grading?
<br />620 feet
<br />measured from cross - sections
<br />What is the volume of material to haul for final contouring?
<br />24,145,456 cy
<br />(See Final Surface & Volumes Dwg., Balanced AGVLF2.pdf) [compare with 13.2 million in 20071
<br />What is the weighted average haul distance for hauling leach fill materials?
<br />1,500 feet
<br />867 meters from the drawings and calculations in the comprehensive analysis by MDE in 2006 & 2007
<br />What is the volume of growth medium required for covering the graded AGVLF?
<br />474,464 cy
<br />area x 806.5 cy /acre it for 6 inch thickness of growth medium
<br />What is the weighted average haul distance for hauling growth medium?
<br />5,000 feet
<br />Growth medium stockpile location map
<br />34,765,456 cy
<br />Total Volume Graded and Hauled
<br />AGVLF Truck Haulage of Leach Material for Re- contouring
<br />What is the weighted average haul distance for truck fleet?
<br />1,500 feet
<br />867 meters from the drawings and calculations in the comprehensive analysis by MDE in 2006 & 2007
<br />What is the anticipated grade resistance for trucks?
<br />3.0 %
<br />Estimated by MDE
<br />What is the rolling resistance for the trucks in percent?
<br />3.0 %
<br />Estimated by MDE
<br />Calculated total resistance for the trucks in percent =
<br />6.0 %
<br />Calculated (grade + rolling)
<br />What is loaded travel time based on haul distance & rolling resistance (min)?
<br />1.6
<br />Cat 777D Truck
<br />Cat Hdbk, 33 Ed, p9-31
<br />What is empty travel time based on haul distance & rolling resistance (min)?
<br />0.9
<br />Cat 777D Truck
<br />Cat Hdbk, 33 Ed, p9-31
<br />What is the manuever time for trucks at the loading area (min)?
<br />0.70
<br />Cat 777D Truck
<br />Cat Hdbk, 33 Ed, p9-9
<br />What is the length of time it takes a truck to dump (min)?
<br />1.00
<br />Cat 777D Truck
<br />Cat Hdbk, 33 Ed, p9-9
<br />What is the bucket capacity of the selected loader (cu yds)?
<br />16
<br />Cat 9926 Loader
<br />Cat Hdbk, 33 Ed, p12 -92
<br />What is the capaciiy of the selected truck (avg cu yds)?
<br />64
<br />Cat 777D Truck
<br />Cat Hdbk, 33 Ed, p94
<br />Calculated number of loader buckets to fill the selected truck =
<br />4.0
<br />Calculated
<br />How long does it take to fill the loader bucket and dump into the truck (min)?
<br />0.75
<br />Experience of MDE
<br />Calculated time for loading a truck (min) =
<br />3.00
<br />Calculated
<br />Total Cycle Time (Maneuver+ Load + Loaded Haul + Empty Haul + Dump) =
<br />7.20
<br />Minutes, calculated
<br />Calculated number of truckloads per hour =
<br />8.3
<br />Calculated
<br />What is the efficiency of the haulage effort expressed as minutes per hour?
<br />55
<br />Experience of MDE
<br />Calculated Productivity of Loader/Truck Combination (cu yds/hour) =
<br />488.9
<br />(truck capacity x truckloads/hr x efficiency)
<br />AGVLF Dozer Productivity in Recontourina
<br />What is the weighted average push distance for the dozen
<br />620
<br />Calculated from quantities and measured cross -section slopes
<br />What is the job correction factor for the operator?
<br />0.75
<br />Average Operator, Cat Hdbk, 33 Ed, p142
<br />What is the job correction factor for the material condition?
<br />1.2
<br />Heap leach material is loose, Cat Hdbk, 33 Ed, p142
<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 />What is the dozer unit and blade type selected?
<br />D11 U-Blade
<br />MDE assumption
<br />What is unadjusted production based on push distance?
<br />640
<br />800 for D11
<br />cu yds/hr from Estimated Dozing Prod. Chart, Cat Hdbk, 33 Ed, pi-39
<br />Calculated adjusted production based on job factors =
<br />581A
<br />cu yds/hr calculated
<br />3/21/2014
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