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sheet 1 of 2 <br />• CIRCES Cost Estimating Software <br />cr rooece nr eerurr_ urnorr <br />PROJECT IDENTIFICATION <br />Task # : Ofb State :Colorado Permitrob # : C-1994-082 <br />Date : 03/17/2005 County : Roud Abbreviation :none <br />User : JRS Site : Yoast Mine Filename : C082-016 <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 Valora Pit E/Mr(Scraper Pit) Hi_9hwall <br /> QUANTITY UNIT <br />Blast area configuration description Wedge-shaped mass <br />Blasting method description Cast blast <br />Highwall or bench face angle 0.50 h:tv <br />Regraded slope angle 1.00 h:1v <br />Highwall or bench length 1,920 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) 100.0 eet <br />Depth to base of cut at highwall face <br />J- < K. <br /> <br />..<. .... ,. -s.,..v.. ',.,.>... fs x, ~~... .»r. 4,..x..a .ti... ~:,..+<, .u' ..,..;.;. ff:. Ff,iS 40.0 <br />~+~ <br />a.,...r ~,...,~.. <br />...»,`s.~s,.,.,,,:&... .....G eet <br /> <br /> <br />>.~ '. <br />BLAST AREA VOLUMES <br />• Total volume of dimensional mass to be shot <br />81ast volume to subdrlll grade and blast pattern lines <br />Blast volume to finish grade and blast pattern lines <br />Remaining volume required to be re-shot or ripped <br />• <br />BLAST AREA DESIGN <br />198 <br />UNIT <br /> OUANTITY 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 Diamefer Ratio 25 imes diameter <br />Burden 19.0 eet <br />Spacing to Burden Ratio 1.1 imes burden <br />Spacing 21.0 feet <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 onwedge-shaped mass) 105.75 ounds <br />Height of powder column per blasthole (avg. height per hole onwedge-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 times burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.1913 cubic yards <br />Number of rows 2 rows <br />Number of blastholes per row 91 holes per row <br />Total number of blastholes 182 holes <br />Total length of all blastholes 2,948 eet <br />