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sheet 1 of 2 <br />CIRCES Cost Estimatinn Software <br />Task # : 001 State :Colorado Permit/job # :M--1987-028 <br />Date : 11/01/2004 County :Chaffee Abbreviation :none <br />User : ESC Site :Lily Mines Filename :M028-001 <br />Agency or organization name :DMG <br />Permit or other job action :Surety Increase <br />Task description :Create 20'Benches on North Highwall <br />QUANTITY UNIT <br />Blast area configuration description Box-shaped mass <br />Blasting method description Conventional surface blast <br />Highwall or bench face angle 0.50 h:1v <br />Regraded slope angle NA h:1v <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 12 eet <br />Highwall or bench height (from pit floor to crest) 80.0 et <br />Depth to base of cut at highwall face 40.0 eet <br />BLAST AREA VOLUMES <br />QUANTITY I UNIT <br />Total volume of dimensional mass to be shot 2,370 cubic yards <br />Blast volume to subdrill grade and blast pattern lines 11,822 cubic yards <br />Blast volume to finish grade and blast pattern lines 11,822 cubic yards <br />Remaining volume required to tre re-shot orripped -9,452 cubic yards <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 5.33 inches <br />Selected blasthole diameter 5.00 inches <br />Subdrilling allowance 0.0 eet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 40.0 eet <br />Density of rock verage DensityR rock density <br />Burden to Charge Diameter Ratio 25 imes diameter <br />Burden 10.0 eet <br />Spacing to Burden Ratio 1.4 imes burden <br />Spacing 14.0 eet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 207.41 cubic yards <br />Powder factor description Medium rock strength <br />Powder factor 0.575 pounds/cu.yd. <br />Densiiy of blasting agent 0.85 rams/cc <br />Quantity of explosives per blasthole (avg. quantity per hole on wedge-shaped mass) 119.26 ounds <br />Height of powder column per blasthole (avg, height per hole onwedge-shaped mass) 16.48 eet <br />Height of stemming per blasthole (avg. height per hale on wedge-shaped mass) 23.52 eel <br />Stemming to burden ratio {avg, ratio per hole onwedge-shaped mass) 2.35 imes burden <br />Quantity of stemming per blasthole (avg. quantity per hole onwedge-shaped mass) 0.1188 cubic yards <br />Number of rows 1 rows <br />Number of blastholes per row 57 holes per row <br />Total number of blastholes 57 holes <br />Total length of all blastholes 2,280 eet <br />