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sheet 1 of 2 <br /> CIRCES Cost Estimating Software <br /> SURFACE BLASTING WORK <br />PROJECT IDENTIFICATION <br />Task # : 001 State :Colorado PermiUjob # : M-2007.010 <br />Date : 03/22/2007 County :Archuleta Abbreviation :none <br />User : WHE Site :Martinez Filename : MO10-001 <br />Agency or organization name :DRMS <br />Permit or other job action :110C Application Review <br />Task descdption :Stabilize highwall <br /> <br />BLASTAREA DIMENSIONS <br /> QUANTITY UNIT <br />Blast area configuration description Box-shaped mass <br />Blasting method description Cast blast <br />Highwall or bench face angle 0.25 h:1v <br />Regraded slope angle NA h:1v <br />Highwall or bench length 300 feet <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 10 feet <br />Highwall or bench height (from pit floor to crest) 80.0 feet <br />Depth to base of cut at highwall face 20.0 eet <br />BLAST AREA VOLUMES <br /> QUANTITY UNIT <br />Total volume of dimensional mass to be shot 1,667 cubic yards <br />Blast volume to subdrill grade and blast pattern lines 1,667 cubic yards <br />Blast volume to finish grade and blast pattern lines 7,667 cubic yards <br />Remaining volume required to be re-shot or ripped 0 cubic yards <br /> <br /> QUANTITY UNIT <br />Recommended blasthole diameter 2.67 inches <br />Selected blasthole diameter 2.50 inches <br />Subdrilling allowance 0.0 feet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 20.0 eet <br />Density of rock Average Density R rock density <br />Burden to Charge Diameter Ratio 25 times diameter <br />Burden 5.0 eet <br />Spacing to Burden Ratio 1.1 times burden <br />Spacing 6.0 ' eet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 22.22 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 (avg. quantity per hole on wedge-shaped mass) 12.78 pounds <br />Height of powder column per blasthole (avg. height per hole onwedge-shaped mass) 7.06 feet <br />Height of stemming per blasthole (avg, height per hole on wedge-shaped mass) 12.94 feet <br />Stemming to burden ratio (avg, ratio per hole on wedge-shaped mass) 2.59 times burden <br />Quantity of stemming per blasthole (avg. quantity per hole onwedge-shaped mass) 0.0163 cubic yards <br />Number of rows 2 rows <br />Number of blastholes per row 50 holes par row <br />Total number of blastholes 100 holes <br />Total length of all blastholes 2,000 feet <br /> <br />