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Page 1 of 3 <br /> SURFACE BLASTING WORK <br /> Task description: Drill and Shoot Pit Highwall <br /> Site: New Horizon Mine Permit Action: RN8r Permit/Job#: C1981008 <br /> PROJECT IDENTIFICATION <br /> Task#: 001 State: Colorado Abbreviation: None <br /> Date: 8/7/2023 County: Montrose Filename: C008-001 <br /> User: CCW <br /> Agency or organization name: DRMS <br /> BLAST AREA DIMENSIONS <br /> QUANTITY UNIT <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: 0.00 h:Iv <br /> Regraded Slope Angle: 3.00 h:lv <br /> Highwall or Bench Length: 2,500 feet <br /> Highwall or Bench Width: 48 feet <br /> Highwall or Bench Height: 79.0 feet <br /> Depth to Base of Cut at Highwall: 16.0 feet <br /> BLAST AREA VOLUMES <br /> QUANTITY UNIT <br /> Total Volume of Dimensional Mass to be Shot: 35,556 cubic yards <br /> Blast Volume to Subdrill Grade and Blast Pattern Lines: 31,061 cubic yards <br /> Blast Volume to Finish Grade and Blast Pattern Lines: 31,061 cubic yards <br /> Remaining Volume Required to be Re-Shot or Ripped: 4,494 cubic yards <br /> BLAST AREA DESIGN <br /> QUANTITY UNIT <br /> Recommended Blasthole Diameter: 2.133 inches <br /> Selected Blasthole Diameter: 5.000 inches <br /> Subdrilling Allowance: 0.0 feet <br /> Blasthole Depth: 8.0 feet <br /> Density of Rock: Low Density Rock(ANFO rock density <br /> Basis) <br /> Burden to Charge Diameter Ratio: 28 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: 57.78 cubic yards <br /> Powder Factor Description: Medium rock strength <br /> Powder Factor: 0.575 pounds/cu.yd. <br /> Density of Blasting Agent: 0.85 rams/cc <br /> Quantity of Explosives per Blasthole: 33.22 POUNDS <br /> Height of Powder Column: 4.59 feet <br /> Height of Stemming per Blasthole: 3.41 feet <br /> Stemming to Burden Ratio: 0.28 times burden <br /> Quantity of Stemming per Blasthole: 0.0172 cubic yards <br /> Number of Rows: 3 rows <br /> Number of Blastholes per Row: 192 holes per row <br /> Total Number of Blastholes: 576 holes <br /> Total Length of all Blastholes: 4,608 feet <br /> CIRCES Cost Estimating Software <br />