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Page 4 of 150 <br /> <br />CIRCES Cost Estimating Software <br />SURFACE BLASTING WORK <br /> <br />Task description: Drill and Shoot Highwall <br />Site: New Horizon North Mine Permit Action: RN1 Permit/Job#: C2010089 <br />PROJECT IDENTIFICATION <br />Task #: 001 State: Colorado Abbreviation: None <br />Date: 1/27/2017 County: Montrose Filename: C089-001 <br />User: JDM <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: 0.50 h:1v <br />Regraded Slope Angle: 1.00 h:1v <br />Highwall or Bench Length: 2,300 feet <br />Highwall or Bench Width: 50 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: 53,241 cubic yards <br />Blast Volume to Subdrill Grade and Blast Pattern Lines: 48,329 cubic yards <br />Blast Volume to Finish Grade and Blast Pattern Lines: 36,259 cubic yards <br />Remaining Volume Required to be Re-Shot or Ripped: 16,982 cubic yards <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended Blasthole Diameter: 7.351 inches <br />Selected Blasthole Diameter: 7.875 inches <br />Subdrilling Allowance: 4.8 feet <br />Blasthole Depth: 21.8 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: 16.0 feet <br />Spacing to Burden Ratio: 1.1 times burden <br />Spacing: 18.0 feet <br />Cubic Yards of Rock per Blasthole: 190.27 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: 109.41 POUNDS <br />Height of Powder Column: 6.10 feet <br />Height of Stemming per Blasthole: 15.70 feet <br />Stemming to Burden Ratio: 0.98 times burden <br />Quantity of Stemming per Blasthole: 0.1967 cubic yards <br />Number of Rows: 2 rows <br />Number of Blastholes per Row: 127 holes per row <br />Total Number of Blastholes: 254 holes <br />Total Length of all Blastholes: 5,537 feet