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sheet 1 of 2 <br />CIRCES Cost Estimating Software <br />SURFACE BLASTING WORK <br />PROJECT IDENTIFICATION <br />Task #: 021 State : Colorado Permit/job # : C_1981-010 <br />Date : 0310312010 County:Moffat Abbreviation :none <br />User : JDM Site : Trapper Mine Filename : C010-021 <br />Agency or organization name : Colorado Division Of Reclamation Mining And Safety <br />Permit or other job action :2010 Midterm Review <br />Task description : Cast Blast Z-Pit (Highwall) <br />ov+?1 r,..?.+.......-......-..-- QUANTITY I UNIT <br />Blast area configuration description Wedge-shaped mass <br />Blasting method description Cast blast <br />Highwall or bench face angle 0.71 v <br />Regraded slope angle 2.00 <br />Highwall or bench length 1,700 r <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 50 <br />Highwall or bench height (from pit floor to crest) 150.0 <br />r'%- fl, fn hnec of rut at hinhwall face 25.0 feet <br />BLAST AREA VOLUMES <br /> QUANTITY <br />Total volume of dimensional mass to be shot 25,382 <br />Blast volume to subdrill grade and blast pattern lines 17,499 <br />Blast volume to finish grade and blast pattern lines 17,499 <br />Remaining volume required to be re-shot or ripped 7,883 <br />UNIT <br />bic yards <br />bic yards <br />bic yards <br />L$LA,l ARCFl ur-01VIr <br />QUANTITY <br />UNIT <br />Recommended blasthole diameter 3.33 i nches <br />Selected blasthole diameter 9.00 i nches <br /> 0.0 f eet <br />Subdrilling allowance 4 <br />12 feet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) . <br /> Cast blasting (AN rock density <br />Density of rock 20 times diameter <br />Burden to Charge Diameter Ratio <br /> 15.0 feet <br />Burden 1.1 times burden <br />Spacing to Burden Ratio <br /> 17.0 feet <br />Spacing <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 87.50 cubic yards <br />Powder factor description Cast blasting rock strength <br /> 2.150 pounds/cu.yd. <br />Powder factor 0.85 grams/cc <br />Density of blasting agent <br />Quantity of explosives per blasthole (avg. quantity per hole on wedge-shaped mass) 188.12 ounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 8.02 feet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) 4.35 feet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) 0.29 times burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.0712 <br />-- <br />- cubic yards <br />- <br />Number of rows T rows <br />Number of blastholes per row 100 holes per row <br />Total number of blastholes 200 holes <br />TM.1 lannfh of all hlacthnlPS 2475 feet