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Pagel of 3 <br /> SURFACE BLASTING WORK <br /> Task description: Drill and Blast Highwall <br /> Site: Goodrich Pit Permit Action: 2025 Inspection Permit/Job#: M2019005 <br /> PROJECT IDENTIFICATION <br /> Task#: 001 State: Colorado Abbreviation: None <br /> Date: 4/14/2025 County: Las Animas Filename: 1 <br /> User: AMG <br /> Agency or organization name: DRMS <br /> BLAST AREA DIMENSIONS <br /> UANTITY UNIT <br /> Blast Area Configuration: Wedge-shaped mass hi hwall reduction using balanced cut/fill <br /> Blasting Method Description: Cast blast(fra entation+lateral movement) <br /> Hi wall or Bench Face Angle: 0.75 My <br /> Regraded Slope Angle: 3.00 My <br /> Hi wall or Bench Len 1,200 feet <br /> Hi wall or Bench Width: 34 feet <br /> Hi wall or Bench Height: 30.0 feet <br /> Depth to Base of Cut at Hi hwall: 11.3 feet <br /> BLAST AREA VOLUMES <br /> QUANTITY UNIT <br /> Total Volume of Dimensional Mass to be Shot: 6,385 cubic yards <br /> Blast Volume to Subdrill Grade and Blast Pattern Lines: 4,635 cubic yards <br /> Blast Volume to Finish Grade and Blast Pattern Lines: 4,635 cubic yards <br /> Remaining Volume Required to be Re-Shot or Ripped: 1,750 cubic yards <br /> BLAST AREA DESIGN <br /> UANTITY UNIT <br /> Recommended Blasthole Diameter: 1.507 inches <br /> Selected Blasthole Diameter: 7.000 inches <br /> Subdrillin Allowance: 0.0 feet <br /> Blasthole Depth: 6.5 feet <br /> Density of Rock: Cast blasting(ANFO Basis) rock density <br /> Burden to Charge Diameter Ratio: 20 times diameter <br /> Burden: 12.0 feet <br /> Spacing to Burden Ratio: 1.1 times burden <br /> Spacing: 13.0 feet <br /> Cubic Yards of Rock per Blasthole: 25.19 cubic yards <br /> Powder Factor Description: Medium rock strength <br /> Powder Factor: 0.575pounds/cu.yd. <br /> Density of Blasting Agent: 0.85 rams/cc <br /> Quantity of Explosives per Blasthole: 14.48 POUNDS <br /> Height of Powder Column: 1.02 feet <br /> Height of Stemming per Blasthole: 5.45 feet <br /> Stemming to Burden Ratio: 0.45 times burden <br /> Quantity of Stenuning per Blasthole: 0.0540 cubic yards <br /> Number of Rows: 2 rows <br /> Number of Blastholes per Row: 92 holes per row <br /> Total Number of Blastholes: 184 holes <br /> Total Length of all Blastholes: 1,191 feet <br /> CIRCES Cost Estimating Software <br />