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I <br /> <br /> <br />CIRCES Cost Estimating Software <br />PROJECT IDENTIFICATIO <br />Street 1 Of 2 <br />Task # : 251 State :Colorado Perm~ob # : C1981-010 <br />Date: 01/19/1006 County:Moffaf Abbreviation :none <br />User; JHB Site :Trapper Mine Filename:COfO-251 <br />Agency or organization name :Colorado Division Of Minerals And Geology <br />Permit or otherjob adion :Tr-96 <br />Task description : Cast Blast East A pit ((305,556 cy, Table 1.4-2J <br />Blast area <br />mass <br />UNIT <br />Highwall or bench face angle ~ 0,50 Ift;1v <br />rrrgnwan or oencn rengm z,ztw ~ eet <br />Highwall or bench width (from vertical line at base of desired cut on highwatl face) 165 eet <br />Highwall or bench height (from pit floor to desq 125.0 eet <br />Depth to base of cut al hghwall face <br />.. ....: <br />.. ,. , , . <br />BLAST AREA VOLUMES ~ ~ 55.0 <br /> <br /> <br />~ ~ <br />QUANTITY eel <br /> <br /> <br />~-~ <br />UNIT <br />Total volume of dimensional mass to be shot 308,102. bic yards <br />Blast volume to subdrill grade and blast pattem lines 297, 747 bic yards <br />Blast volume to finish grade and blast pattem tines 297,747 bic yards <br />Remaining volume recuired to be re-shot ar riooed 1n 35d ~ mir vnMn <br /> QUANTITY UNIT <br />Recommended blasthole diameter 7.33 'nches <br />Selected blasthole diameter 10.62 inches <br />Subdrilling allowance 0.0 et <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 24.6 eet <br />Density of rock Cast blasting (AN ock density <br />Burden to Charge Diameter Ratio 20 'mes diameter <br />Burden 18.0 eel <br />Spacing to Burden Ratio 1.1 Imes burden <br />Spacing 20.0 eet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 338.35 cubic yards <br />Powder fador description Cast blasting rods strength <br />Powder fador 2.150 pounds/cu.yd. <br />Density of blasting agent 0.85 rams/cc <br />Quantity of explosives per blasthole (avg. quantity per hole on wedge-shaped mass) 727.45 ounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 22.28 eet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) 2.57 eel <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) 0.14 'mes burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.0586 bic yards <br />Number of rows 8 rows <br />Number of blastholes per row 110 holes per row <br />Total number of blastholes 880 holes <br />Total length of all blastholes 21,853 eel <br />/-~ p,(r~~7t ~C <br />