Laserfiche WebLink
Page 1 of 3 <br /> SURFACE BLASTING WORK <br /> Task description: Drill and Shoot Highwall Side of Pit Ramp <br /> Site: New Horizon Mine Permit Action: RN8r Permit/Job#: C1981008 <br /> PROJECT IDENTIFICATION <br /> Task#: 004 State: Colorado Abbreviation: None <br /> Date: 8/7/2023 County: Montrose Filename: C008-004 <br /> User: CCW <br /> Agency or organization name: Colorado Division of Reclamation,Mining and Safety <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: 5.00 h:lv <br /> Highwall or Bench Length: 400 feet <br /> Highwall or Bench Width: 40 feet <br /> Highwall or Bench Height: 79.0 feet <br /> Depth to Base of Cut at Highwall: 8.0 feet <br /> BLAST AREA VOLUMES <br /> QUANTITY UNIT <br /> Total Volume of Dimensional Mass to be Shot: 2,370 cubic yards <br /> Blast Volume to Subdrill Grade and Blast Pattern Lines: 1,733 cubic yards <br /> Blast Volume to Finish Grade and Blast Pattern Lines: 1,733 cubic yards <br /> Remaining Volume Required to be Re-Shot or Ripped: 637 cubic yards <br /> BLAST AREA DESIGN <br /> QUANTITY UNIT <br /> Recommended Blasthole Diameter: 1.067 inches <br /> Selected Blasthole Diameter: 5.000 inches <br /> Subdrilling Allowance: 0.0 feet <br /> Blasthole Depth: 4.4 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: 32.36 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: 18.60 POUNDS <br /> Height of Powder Column: 2.57 feet <br /> Height of Stemming per Blasthole: 1.83 feet <br /> Stemming to Burden Ratio: 0.15 times burden <br /> Quantity of Stemming per Blasthole: 0.0092 cubic yards <br /> Number of Rows: 2 rows <br /> Number of Blastholes per Row: 30 holes per row <br /> Total Number of Blastholes: 60 holes <br /> Total Length of all Blastholes: 264 feet <br /> CIRCES Cost Estimating Software <br />