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CIRCES Cost Estimatina Software <br />SURFACE BLASTING WORK <br />PROJECT IDENTIFICATION <br />sheet 1 of 2 <br />Task # : 128 State : Colorado Permit/job #: C-1981-010 <br />Date : 1210712007 County : Moffat Abbreviation :none <br />User : JHB Site : Trapper Mine Filename : C010-128 <br />Agency or organization name : Division Of Reclamation, Mining And Safety <br />Permit or other job action : Rn5 <br />Task description : Cast Blast F pit Dipline Highwall (805,556 cy, Table 1.42) <br />BLAST AREA DIMENSIONS <br /> QUANTITY UNIT <br />Blast area configuration description Wedge-shaped mass <br />Blasting method description Cast blast <br />t <br />Highwall or bench face angle 0. <br />71 v <br />h:1 <br />Regraded slope angle 2. h:1v <br />Highwall or bench length 5,800 feet <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 150 feet <br />Highwall or bench height (from pit floor to crest) 140.0 feet <br />Depth to base of cut at highwall face 75.0 feet <br />.; <br />:.:...........:.........:,...::::::::.::::::......:::::::;:>..... <br />BLAST AREA VOLUMES <br />QUANTITY UNIT <br />Total volume of dimensional mass to be shot 779,375 cubic yards <br />Blast volume to subdrill grade and blast pattern lines 677,537 cubic yards <br />Blast volume to finish grade and blast pattern lines 677,537 cubic yards <br />Remaining volume required to be re-shot or ripped 101,838 cubic yards <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 10. inches <br />Selected blasthole diameter 10.62 inches <br />Subdrilling allowance 0.0 feet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 25.9 feet <br />Density of rock Cast blasting (AN rock density <br />Burden to Charge Diameter Ratio NA-user data times diameter <br />Burden 30.0 feet <br />Spacing to Burden Ratio NA-user data times burden <br />Spacing 30.0 feet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 877.64 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) 1,886.92 ounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 57.75 feet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) -31.88 feet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) -1.06 times burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) -0.7269 cubic yards <br />Number of rows 4 rows <br />Number of blastholes per row 193 holes per row <br />Total number of blastholes 772 holes <br />Total length of all blastholes 19,976 feet