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sheet 1 of 2 <br />CIRCES Cost Estimating Software <br />SURFACE BLASTING WORK <br />PROJECT IDENTIFICATION <br />Task #: 020 State : Colorado Permit/job #: C-1981-010 <br />Date : 0310312010 County: Moffat Abbreviation :none <br />User : JDM Site : Trapper Mine Filename : C010-020 <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 F-Pit Dipline (Highwall) <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 0.71 h:1v <br />Regraded slope angle 2.00 h:1v <br /> <br />Highwall or bench length <br />4,800 _ <br />feet <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 50 feet <br />Highwall or bench height (from pit floor to crest) 150.0 feet <br />Depth to base of cut at highwall face 25.0 feet <br />BLAST AREA VOLUMES <br />QUANTITY UNIT <br />Total volume of dimensional mass to be shot 71,667 cubic yards <br />Blast volume to subdrill grade and blast pattern lines 49,348 cubic yards <br />Blast volume to finish grade and blast pattern lines 49,348 cubic yards <br />Remaining volume required to be re-shot or ripped 22,319 cubic yards <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 3.33 inches <br />Selected blasthole diameter 9.00 inches <br />Subdrilling allowance 0.0 feet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 12.4 feet <br />Density of rock Cast blasting (AN rock density <br />Burden to Charge Diameter Ratio 20 times diameter <br />Burden 15.0 feet <br />Spacing to Burden Ratio 1.1 times burden <br />Spacing 17.0 feet <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 />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) 188.12 pounds <br /> <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) <br />8.02 _ <br />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 cubic yards <br />Number of rows 2 rows <br />Number of blastholes per row 282 holes per row <br />Total number of blastholes 564 holes <br />Total length of all blastholes 6,980 feet