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• <br />sheet 1 of 2 <br />Task # ; 01 f Stafe :Colorado Permitlob # : C-1994-082 <br />Date : 03/212005 County :Routt Abbreviation :none <br />User ; JRS Site : Yoast Mine Filename : C082-0if <br />Agency or organization name :Colorado Division Of Minerals And Geology <br />Permit or otherjob action :Permit Renewa102. <br />Task description :Drill and Shoot Neck Pit Highwall <br />"r'< <br />. .. ~w+.. . w. z....... ~.... ~ .... .<..........n.. <br />BLAST AREA DIMENSIONS <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:1v <br />Regraded slope angle 1.00 h:1v <br />Highwall or bench length 770 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 />..._ ......,.a. .. .' ..... c.a. ~,..~.. „.,... ....,5 :', .......u '_ .,... .......... '....... k.~ ..,..~~ . 40.0 <br />- .. .. »....:`t:;`f eet <br />2::;D;u `i'ce, v' ~.,...... <br />BLAST AREA VOLUMES <br />UNIT <br />• Total volume of dimensional mass to be shot <br />Blast volume to subdrill grade and blast pattem lines <br />Blast volume to finish grade and blast pattem lines <br />Remaining volume recuired to be re-shot or ripped <br />AREA DESIGN <br />• <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 onwedge-shaped mass) 183.91 cubic yards <br />Powder factor description Medium rock strength <br />Powder factor 0.575 poundslcu.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 fiole 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 imes 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 36 holes per row <br />Total number of blastholes 72 holes <br />Total length of all blastholes 1,166 eet <br />CIRCES Cost Estimation Software <br />