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CIRCES Cost Estimating Software <br />SURFACE BLASTING WORK <br />sheet 1 of 2 <br />PROJECT IDENTIFICATION <br />Task # : 001 State :Colorado Permitfjob # : M-1983.033 <br />Date : 08/13/2002 County :Clear Creek Abbreviation :none <br />User : ACS Site : Walstrum Quarry Filename :M033-001 <br />Agency or organization name :Colorado Division Oi Minerals And Geology <br />Permit or other job action :Permit Amendment Am-8 <br />Task description :Blast required benches into north and east quarry faces <br />BL ST AREA DIMENSIONS <br /> QUANTITY UNIT <br />Blast area configuration description Box-shaped mass <br />Blasting method description Conventional surface blast <br />Highwall or bench face angle 0.83 h:iv <br />Fiegradedslopeangle NA h:tv <br />Highwall or bench length 135 eet <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 40 eet <br />Highwall or bench height (from pit floor to crest) 420.0 eat <br />Depth to base of cut at highwall face 40.0 eet <br />BLAST AREA VOLUMES <br />Total volume of dimensional mass to be shot <br />QUANTITY ~ UNIT <br />3,644 <br />Blast volume to finish grade and blast pattern lines ~ 3,320 cubic yards <br />Remaining volume required to be re-shot or ripped 1,360 ubic vards <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 6.50 inches <br />Selected blasthole diameter 6.75 inches <br />SubdriWng allowance 3.9 t <br />Blasthole depth (avg. depth of holes an wedge-shaped mass) 43.9 eet <br />Density of rock High Density Rock rock density <br />Burden to Charge Diameter Ratio NA-user data Imes diameter <br />Burden 13.0 feet <br />Spacing to Burden Ratio NA-user data imes burden <br />Spacing 15.0 eet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 317.06 cubic yards <br />Powder factor description High rock strength <br />Powder factor 1.000 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) 31706 ounds <br />Height of powder column per blasthole (avg. height per hdle on wedge-shaped mass) 24.04 feet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) 19.86 eet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) 1.53 times burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.1828 cubic yards <br />Number of rows 1 rows <br />Number of blastholes per row - 9 holes per row <br />Total number of blastholes 9 holes <br />Total length of all blastholes 395 feet <br />