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SURFACE BLASTING WORK <br />Task description: Cast Blast Z -Pit (Mghwall) <br />Site: Trapper Mine Permit Action: MT7 Permit/Job#: C1981010 <br />PROJECT IDENTIFICATION <br />Task #: 021 State: Colorado <br />Date: 6/12/2015 County: Moffat <br />User: JLE <br />Agency or organization name: DRMS <br />BLAST AREA DIMENSIONS <br />Abbreviation: None <br />Filename: C081-021 <br />UANTITY I UNIT <br />Blast Area Configuration: Wedge-shaped mass hi wall reduction using balanced cut/fill <br />Blasting Method Descri tion: Cast blast (fragmentation + lateral movement <br />Hi wall or Bench Face Angle: 0.71 h: Iv <br />Regraded Slope Angle: 2.00 h: Iv <br />Hi hwall or Bench Len 542 feet <br />Hi hwall or Bench Width: 50 feet <br />Hi wall or Bench Height: 150.0 feet <br />Depth to Base of Cut at Highwall: 25.0 feet <br />BLAST AREA VOLUMES <br />BLAST AREA DESIGN <br />QUANTITY <br />UNIT <br />Total Volume of Dimensional Mass to be Shot: <br />8,092 <br />cubic yards <br />Blast Volume to Subdrill Grade and Blast Pattern Lines: <br />5,425 <br />cubic yards <br />Blast Volume to Finish Grade and Blast Pattern Lines: <br />5,425 <br />cubic yards <br />Remaining Volume Required to be Re -Shot or Ripped: <br />2,668 <br />cubic yards <br />BLAST AREA DESIGN <br />QUANTITY <br />UNIT <br />Recommended Blasthole Diameter: <br />3.333 <br />inches <br />Selected Blasthole Diameter: <br />9.000 <br />inches <br />Subdrillin Allowance: <br />0.0 <br />feet <br />Blasthole Depth: <br />12.4 <br />feet <br />Density of Rock: <br />Cast blasting ANFO Basis <br />rock density <br />Burden to Charge Diameter Ratio: <br />20 <br />times diameter <br />Burden: <br />15.0 <br />feet <br />Spacing to Burden Ratio: <br />1.1 <br />times burden <br />Spacing: <br />17.0 <br />feet <br />Cubic Yards of Rock per Blasthole: <br />87.50 <br />cubic yards <br />Powder Factor Description: <br />Cast blasting <br />rock strength <br />Powder Factor: <br />2.150pounds/cu. <br />yd. <br />Density of Blasting Agent: <br />0.85 <br />ams/cc <br />Quantity of Explosives per Blasthole: <br />188.12 <br />POUNDS <br />Height of Powder Column: <br />8.02 <br />feet <br />Height of Stemming per Blasthole: <br />4.35 <br />feet <br />Stemming to Burden Ratio: <br />0.29 <br />times burden <br />Quantity of Stemming per Blasthole: <br />0.0712 <br />cubic yards <br />Number of Rows: <br />2 <br />rows <br />Number of Blastholes per Row: <br />31 <br />holes per row <br />Total Number of Blastholes: <br />62 <br />holes <br />Total Length of all Blastholes: <br />767 <br />feet <br />