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SURFACE BLASTING WORK <br />Task description: Drill and Shoot South Taylorffighwall-CastBlast(3000ft) <br />Site: Colowyo Coal Mne Permit Action: RN7 Permit/Job#: C1981019 <br />PROJECT IDENTIFICATION <br />Task#: 001 State: Colorado Abbreviation: None <br />Date: 1/12/2018 County: Moffat Filename: C019-001 <br />User: ZTT <br />Agency or organization name: DRMS <br />BLAST AREA DIMENSIONS <br />QUANTITY UNIT <br />Blast Area Configuration: I Box -shaped mass (flats afetbenches, general pit blasting) <br />Blasting Method Description: I Cast blast (fragmentation+ lateral movement) <br />Hi hwall orBench Face Angle: <br />1.00 <br />h:lv <br />Regraded Slope Angle: <br />0.00 <br />h:lv <br />Highwall orBench Length: <br />3,000 <br />feet <br />Hi hwall orBench Width: <br />150 <br />feet <br />Hi hwall orBench Height: <br />100.0 <br />feet <br />Death to Base of Cut at Hiahwall: <br />50.0 <br />feet <br />BLAST AREA VOLUMES <br />QUANTITY UNIT <br />Total Volume ofDimensionalMasstobeShot: <br />694,444 cubic yards <br />Blast Volume to Subdrill Grade and Blast Pattern Lines: <br />679,583 cubic yards <br />Blast Volume to Finish Grade and Blast Pattern Lines: <br />603,537 cubic yards <br />Remaining Volume Required to be Re -Shot orRi ed: <br />90,907 cubic yards <br />BLAST AREA DESIGN <br />QUANTITY <br />UNIT <br />Recommended Blasthole Diameter: <br />7.351 <br />inches <br />Selected Blasthole Diameter: <br />9.875 <br />inches <br />Subdrilling Allowance: <br />6.3 <br />feet <br />Blasthole Depth: <br />56.3 <br />feet <br />Density ofRock: <br />Average Density Rock rockdensity <br />ANFO Basis <br />Burden to Charge Diameter Ratio: <br />25 <br />times diameter <br />Burden: <br />21.0 <br />feet <br />Spacing to Burden Ratio: <br />1.1 <br />times burden <br />Spacing: <br />23.0 <br />feet <br />Cubic Yards ofRockperBlasthole: <br />1,007.14 <br />cubic yards <br />Powder Factor Description: <br />Medium <br />rockstren th <br />PowderFactor: <br />0.575pounds/cu. <br />yd. <br />Density ofBlastingAgent: <br />0.85 <br />grams/cc <br />Quantity ofExplosives erBlasthole: <br />579.11 <br />POUNDS <br />Height ofPowder Colurnn: <br />20.52 <br />feet <br />Height ofStenuning per Blasthole: <br />35.78 <br />feet <br />Sterntning to Burden Ratio: <br />1.70 <br />times burden <br />Quantity of Sterna-fing perBlasthole: <br />0.7048 <br />cubic yards <br />Number of Rows: <br />5 <br />rows <br />NumberofBlastholes erRow: <br />130 <br />holes perrow <br />Total Number ofBlastholes: <br />650 <br />1 holes <br />