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sheet 1 of 2 <br />CIRCES Cost Estimating Software <br />~~ <br />PROJECT IDENTIFICATION <br />Task # : 252 State :Colorado Pennitlob # : C1981-010 <br />Date : 01/19/2006 County:MoNat Abbreviation : none <br />User: JHB Site :Trapper Mine Filename: C010-252 <br />Agency or organization name :Colorado Division O/Minerals And Geology <br />Permit or other job action : Tr-96 <br />Task description :Cast Blast G-strike pit highwall (222,222 cy, Table 1.42J <br />... .. .. .. .. S ..:.. ... .. <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 w bench length 1, 600 eet <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 166 eet <br />Highwall or bench height (from pit floor to crest) 115.0 eet <br />Depth to base of cut at highwall face 55.5 <br />BLAST AREA VOLUMES <br /> QUANTITY UNIT <br />Total volume of dimensional mass to be shot 228,167 cubic yards <br />Blast volume to subdrill grade and blast pattem lines 220,223 cubic yards <br />Blast volume to finish grade and blast pattem lines 220,223 cubic yards <br />Remaining volume required to be re-shot or ripped 7,944 ubic yards <br />BLAST AREA DESIGN <br /> <br /> QUANTITY UNIT <br />Recommended blasthole diameter 7.40 inches <br />Selected blasthole diameter 10.62 inches <br />Subdrilling allowance 0.0 eet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 25.2 eet <br />Density of rock Cast blasting (AN rock density <br />Burden to Charge Diameter Ratio 20 imes diameter <br />Burden 18.0 eet <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) 344.10 cubic yards <br />Powder factor description Cast blasting rock strength <br />Powder factor 2.150 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) 739.81 ounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 22.64 eet <br />Height of stemming per blasthole (avg. height per hole an wedge-shaped mass) 2.61 eet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) 0.14 imes burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.0595 cubic yards <br />Number of rows 8 rows <br />Number of blastholes per row 80 holes per row <br />Total number of blastholes 640 holes <br />Total length of all blastholes 16,160 eet <br />n~~~~ ~ <br />