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sheet 1 of 2 <br />CIRCES Cost Estimating Software <br />SURFACE BLASTING WORK <br />PROJECT IDENTIFICATION <br />Task # : 01a State :Colorado Permit/job #:M-1995-012 <br />Date : 0912312010 County :Moffat Abbreviation :none <br />User : DMC Site: Powell'S Gravel Pit Filename :M012-01a <br />Agency or organization name: DRMS <br />Permit or other job action :110C )dg <br />Task description : Removal of unstable outcrop <br /> <br />RI AST AREA DIMENSIONS <br /> QUANTITY UNIT <br />Blast area configuration description Wedge-shaped mass <br />Blasting method description Conventional surface blast <br />Highwall or bench face angle 0.00 h:1v <br />Regraded slope angle 3.00 h:1v <br />Highwall or bench length 50 feet <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 45 feet <br />all or bench height (from pit floor to crest) <br />Highw 20.0 feet <br />_ <br />Depth to base of cut at highwall face 15.0 feet <br />BLAST AREA VOLUMES <br />QUANTITY UNIT <br />Total volume of dimensional mass to be shot 625 cubic yards <br />Blast volume to subdrill grade and blast pattern lines 701 cubic yards <br />Blast volume to finish grade and blast pattern lines 612 cubic yards <br />Remaining volume required to be re-shot or ripped 13 cubic yards <br />RI AST ARFA DFSIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 2.21 inches <br />Selected blasthole diameter 2.00 inches <br />Subdrilling allowance 1.2 feet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 8.9 feet_ <br />Density of rock Average Density R rock density <br />Burden to Charge Diameter Ratio 25 times diameter <br />Burden 4.0 feet <br />Spacing to Burden Ratio 1.2 times burden <br />Spacing 5.0 feet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 7.02 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) 4.03 pounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 3.49 feet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) 5.38 feet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) 1.35 times burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.0043 cubic yards <br />Number of rows 10 rows <br />Number of blastholes per row 10 holes per row <br />Total number of blastholes 100 holes <br />Total length of all blastholes 887 feet