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