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sheet 1 of 2 <br />CIRCES Cost Estimating Software <br />,M1J , , SURFACE BLASTING WORK <br />PROJECT IDENTIFICATION <br />Task # : 251 State :Colorado PermiUob # : C1981-0f0 <br />Date : 01/19/2006 County :MoNat Abbreviation : none <br />User : JHB Site :Trapper Mine Filename : C010-251 <br />Agency or organization name :Colorado Division O/Minerals And Geology <br />Permit or other job action : Tr96 <br />Task description :Cast Blast G-Strike Highwall (222,222 cy, Table 1.42) <br /> <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 3.00 h:1v <br />Highwall or bench length 1,600. et <br />Highwall w bench width (from vertical line at base of desired cut on highwall face) 169 <br />Highwall or bench height (from pfl floor to crest) 100.0 eet <br />Deoth to base of cut at highwall face 54.5 eet <br />Total volume of dimensions <br />Blast volume to subdrill gra <br />volume <br />I mass to be shot <br />de and blast pattem lirn <br />and blast pattem lines <br />to be re-shot or ripped <br />QUANTITY <br />UNIT <br /> QUANTITY UNIT <br />Rewmmended blasthole diameter 7.27 inches <br />Selected blasthole diameter 10.62 inches <br />Subddlling allowance 0.0 eet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 30.4 t <br />Density of rock NA-user data density <br />Burden to Charge Diameter Ratio NA-user data imes diameter <br />Burden 30.0 eet <br />Spacing to Burden Ratio NA-user data imes burden <br />Spacing 30.0 eet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 903.66 cubic yards , <br />Powder factor description Cast blasting rock strength <br />Powder factor 2.150 unds/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) 1,942.86 ounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 59.46 eet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) -29.05 eet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) -0.97 imes burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) -0.6624 cubic yards <br />Number of rows 4 rows <br />Number of blastholes per row 53 holes per row <br />Total number of blastholes 212 holes <br />Total length of all blastholes 6,448 eet <br />~1 pp.-,~.ol~~ <br />