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sheet 1 of 2 <br />• CIRCES Cost Estimating Software <br />ci ~ocerc ai ecTiur_ wnoir <br />Task # : 01 a State :Colorado Permitlob # : C-1994-082 <br />Date : 03/21/2005 County :Routt Abbreviation :none <br />User: JRS Site:YoastMrne Filename:C082-Ole <br />Agency or organization name :Colorado Division Of Minerals And Geology <br />Permit or other job action :Permit Renewa102 <br />Task description :Drill and Shoot Current Pit Highwall <br />AREA DIMENSIONS <br /> QUANTITY UNIT <br />Blast area configuration descdption Wedgeshaped mass <br />Blasting method description Cast blast <br />Highwall or bench face angle 0.50 h;1v <br />Regraded slope angle 1.00 h:tv <br />Highwall or bench length 850 et <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 40 eet <br />Highwall or bench height (from pft floor to crest) 100.0 eet <br />Depth to base of cut at highwall face <br /> <br />.... .....w ...v ...1. ~»...IX. f.., vJet '..~ .~.'.nn.~ ~~....... iw 1 L <br />~ ... a .. >:6.. .... 40.0 <br />.`w <br />.a.. a.. ~$np. vn vv <br />....,, ?ac>;r..n,: A:::~T'O~.:yty eet <br /> <br />. K.~i o....c <br />^ S.' <br />BLAST AREA VOLUMES <br />• Total volume of dimens <br />Blast volume to subdrill <br />Blast volume to finish g <br />C <br />Remaining volume req~ <br />mass to be shot <br />le and blast pattem lines <br />and blast pattem lines <br />to be re-shot or ripped <br />OUANTITY I UNIT <br />BLASTAREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 5.88 inches <br />Selected blasthole diameter 9.00 inches <br />Subdrilling allowance 5.7 eet <br />blasthole depth (avg. depth of holes on wedge-shaped mass) 16.2 eet <br />Density of rock verage Density R rock density <br />Burden to Charge Diameter Ratio 25 imes diameter <br />Burden 19.0 eet <br />Spacing to Burden Ratio 1.1 imes burden <br />Spacing 21.0 eet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 183.91 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) 105.75 ounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 4.51 eet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) 11.69 eet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass} 0.62 imes burden <br />Quantity of stemming per blasthole (avg. quantity per hole onwedge-shaped mass) 0.1913 cubic yards <br />Number of rows 2 rows <br />Number of blastholes per row 40 holes per row <br />Total number of blastholes 80 holes <br />Total length of ail blastholes <br />fC. ... ~" 1,296 <br />~ 5 _ ~ eet <br />} <br />