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Page 4of 151 <br />SURFACE BLASTINGWORK <br />Task description:Drill and Shoot Highwall <br />Permit Action:2014 Midterm Review <br />Site:New Horizon North Mine(MT-1)Permit/Job#:C2010089 <br />PROJECT IDENTIFICATION <br />Task #:001State:ColoradoAbbreviation:None <br />Date:12/12/2014County:MontroseFilename:C089-001 <br />User:SLB <br />:DRMS <br />Agency or organization name <br />BLAST AREA DIMENSIONS <br />QUANTITYUNIT <br />Blast Area Configuration:Wedge-shaped mass (highwall reduction using balanced cut/fill) <br />Blasting Method Description:Cast blast (fragmentation + lateral movement) <br />Highwall or Bench Face Angle:0.50h:1v <br />Regraded Slope Angle:1.00h:1v <br />Highwall or Bench Length:2,300feet <br />Highwall or Bench Width:50feet <br />Highwall or Bench Height:100.0feet <br />Depth to Base of Cut at Highwall:50.0feet <br />BLAST AREA VOLUMES <br />QUANTITYUNIT <br />TotalVolume of Dimensional Mass to be Shot:53,241cubic yards <br />Blast Volume to SubdrillGrade and Blast Pattern Lines:48,329cubic yards <br />Blast Volume to Finish Grade and Blast Pattern Lines:36,259cubic yards <br />Remaining Volume Required to be Re-Shot or Ripped:16,982cubic yards <br />BLAST AREA DESIGN <br />QUANTITYUNIT <br />Recommended Blasthole Diameter:7.351inches <br />Selected Blasthole Diameter:7.875inches <br />Subdrilling Allowance:4.8feet <br />Blasthole Depth:21.8feet <br />Density of Rock:Average Density Rock rock density <br />(ANFO Basis) <br />Burden to Charge Diameter Ratio:25times diameter <br />Burden:16.0feet <br />Spacing to Burden Ratio:1.1times burden <br />Spacing:18.0feet <br />Cubic Yards of Rock per Blasthole:190.27cubic yards <br />Powder Factor Description:Mediumrock strength <br />Powder Factor:0.575pounds/cu. yd. <br />Density of Blasting Agent:0.85grams/cc <br />Quantity of Explosives per Blasthole:109.41POUNDS <br />Height of Powder Column:6.10feet <br />Height of Stemming per Blasthole:15.70feet <br />Stemming to Burden Ratio:0.98times burden <br />Quantity of Stemming per Blasthole:0.1967cubic yards <br />Number of Rows:2rows <br />Number of Blastholes per Row:127holes per row <br />Total Number of Blastholes:254holes <br />Total Length of all Blastholes:5,537feet <br />CIRCES Cost Estimating Software <br />