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SURFACE BLASTING WORK <br />Task description: Drill and Shoot West Pit Highwall - Cast Blast <br />Site: Colowyo Coal Mine Permit Action: Permit Renewal 06 <br />PROJECT IDENTIFICATION <br />Task #: 001 State: Colorado <br />Date: 1/7/2013 County: Moffat <br />User: JRS <br />Agency or organization name: DRMS <br />BLAST AREA DIMENSIONS <br />Permit /Job #: C1981019 <br />Abbreviation: None <br />Filename: C019 -001 <br />OUANTITY I UNIT <br />Blast Area Configuration: <br />Box - shaped mass (flat safety benches, general pit blasting) <br />Blasting Method Description: <br />Cast blast (fragmentation + lateral movement) <br />Highwall or Bench Face Angle: <br />1.00 <br />h: Iv <br />Regraded Slope Angle: <br />0.00 <br />h: Iv <br />Highwall or Bench Length: <br />5,000 <br />feet <br />Highwall or Bench Width: <br />150 <br />feet <br />Highwall or Bench Height: <br />100.0 <br />feet <br />Depth to Base of Cut at Highwall: <br />50.0 <br />feet <br />BLAST AREA VOLUMES <br />BLAST AREA DESIGN <br />QUANTITY <br />UNIT <br />Total Volume of Dimensional Mass to be Shot: <br />1,157,407 <br />cubic yards <br />Blast Volume to Subdrill Grade and Blast Pattern Lines: <br />1,134,380 <br />cubic yards <br />Blast Volume to Finish Grade and Blast Pattern Lines: <br />1,007,443 <br />cubic yards <br />Remaining Volume Required to be Re -Shot or Ripped: <br />149,965 <br />cubic yards <br />BLAST AREA DESIGN <br />CIRCES Cost Estimating Software <br />QUANTITY <br />UNIT <br />Recommended Blasthole Diameter: <br />7.351 <br />inches <br />Selected Blasthole Diameter: <br />9.875 <br />inches <br />Subdrilling Allowance: <br />6.3 <br />feet <br />Blasthole Depth: <br />56.3 <br />feet <br />Density of Rock: <br />Average Density Rock <br />(ANF O Basis) <br />rock density <br />Burden to Charge Diameter Ratio: <br />25 <br />times diameter <br />Burden: <br />21.0 <br />feet <br />Spacing to Burden Ratio: <br />1.1 <br />times burden <br />Spacing: <br />23.0 <br />feet <br />Cubic Yards of Rock per Blasthole: <br />1,007.14 <br />cubic yards <br />Powder Factor Description: <br />Medium <br />rock strength <br />Powder Factor: <br />0.575 <br />pounds /cu. yd. <br />Density of Blasting Agent: <br />0.85 <br />grams /cc <br />Quantity of Explosives per Blasthole: <br />579.11 <br />POUNDS <br />Height of Powder Column: <br />20.52 <br />feet <br />Height of Stemming per Blasthole: <br />35.78 <br />feet <br />Stemming to Burden Ratio: <br />1.70 <br />times burden <br />Quantity of Stemming per Blasthole: <br />0.7048 <br />cubic yards <br />Number of Rows: <br />5 <br />rows <br />Number of Blastholes per Row: <br />217 <br />holes per row <br />Total Number of Blastholes: <br />1,085 <br />holes <br />Total Length of all Blastholes: <br />61,086 <br />feet <br />CIRCES Cost Estimating Software <br />