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Page 13 of 157 <br />SURFACE BLASTING WORK <br />Task description: Drill and Shoot Highwall Side of Pit Ramp <br />Site: New Horizon Mine Permit Action: SL16 Permit/Job#: C1981008 <br />PROJECT IDENTIFICATION <br />Task #: 004 State: Colorado Abbreviation: None <br />Date: 11/19/2015 County: Montrose Filename: C008-004 <br />User: JDM <br />Agency or organization name: Colorado Division of Reclamation, Mining and Safety <br />BLAST AREA DIMENSIONS <br />UNIT <br />Blast Area Configuration: <br />Wedge-shaped mass (highwall reduction using balanced cut/fill) <br />Blasting Method Description: <br />Cast blast (fragmentation + <br />lateral movement) <br />feet <br />Highwall or Bench Face Angle: <br />0.00 <br />h: l v <br />Regraded Slope Angle: <br />5.00 <br />h:lv <br />Highwall or Bench Length: <br />400 <br />feet <br />Highwall or Bench Width: <br />40 <br />feet <br />Highwall or Bench Height: <br />79.0 <br />feet <br />Death to Base of Cut at Hiehwall: <br />8.0 <br />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: 1,052 cubic yards <br />Blast Volume to Finish Grade and Blast Pattern Lines: 1,052 cubic yards <br />Remainine Volume Reauired to be Re -Shot or Rinsed: 1.319 cubic vards <br />BLAST AREA DESIGN <br />UANTITY UNIT <br />Recommended Blasthole Diameter: 1.067 inches <br />Selected Blasthole Diameter: 6.000 inches <br />Subdrillin Allowance: 0.0 feet <br />Blasthole Depth: 5.2 feet <br />Density of Rock: Low Density Rock (ANFO rock density <br />Burden to Charge Diameter Ratio: <br />28 <br />times diameter <br />Burden: <br />14.0 <br />feet <br />Spacing to Burden Ratio: <br />1.1 <br />times burden <br />Spacing: <br />15.0 <br />feet <br />Cubic Yards of Rock per Blasthole: <br />51.33 <br />cubic yards <br />Powder Factor Description: <br />Medium <br />rock strength <br />Powder Factor: <br />0.575pounds/cu. <br />yd. <br />Density of Blasting Agent: <br />0.85 <br />ams/cc <br />Quantity of Explosives per Blasthole: <br />29.52 <br />POUNDS <br />Height of Powder Column: <br />2.83 <br />feet <br />Height of Stemming per Blasthole: <br />2.37 <br />feet <br />Stemming to Burden Ratio: <br />0.17 <br />times burden <br />Quantity of Stemming per Blasthole: <br />0.0172 <br />cubic yards <br />Number of Rows: <br />1 <br />rows <br />Number of Blastholes per Row: <br />26 <br />holes per row <br />Total Number of Blastholes: <br />26 <br />holes <br />Total Leneth of all Blastholes: <br />135 <br />feet <br />CIRCES Cost Estimating Software <br />