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CIRCES Cost Estimatinal Software <br />SURFACE BLASTING WORK <br />sheet 1 of 2 <br />PROJECT IDENTIFICATION <br />Task # : 002 State : Colorado Permit/job #: C-1982-057 <br />Date : 0311512010 County: Routt Abbreviation : none <br />User : JRS Site : Seneca li-W Mine Filename :C057-002 <br />Agency or organization name :Colorado Division Of Reclamation, Mining And Safety <br />Permit or other job action :Partial Phase I Bond Release SI-02 <br />Task description :Drill and Shoot South Wadge Pit Highwall <br />t.r <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 1.00 h:1v <br />Highwall or bench length 2,280 feet <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 40 feet <br />Highwall or bench height (from pit floor to crest) 110.0 feet <br />Depth to base of cut at highwall face 40.0 eet <br />BLAST AREA VOLUMES <br />QUANTITY UNIT <br />Total volume of dimensional mass to be shot 33,778 cubic yams <br />Blast volume to subdrill grade and blast pattern lines 8,400 cubic yards <br />Blast volume to finish grade and blast pattern lines 8,400 cubic yards <br />Remaining volume required to be re-shot or ripped 25,376 cubic yards <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 5.33 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) 20.0 feet <br />Density of rock Average Density rock density <br />Burden to Charge Diameter Ratio 25 times diameter <br />Burden 19.0 feet <br />Spacing to Burden Ratio 1.1 times burden <br />Spacing 21.0 feet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 77.78 cubic yards <br />Powder factor description Medium rock strength <br />Powder factor 0.575 pounds/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) 44.72 pounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 1.91 feet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) 18.09 feet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) 0.95 times burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.2960 cubic yards <br />Number of rows 1 rows <br />Number of blastholes per row 108 holes per row <br />Total number of blastholes 108 holes <br />Total length of all blastholes 2,160 feet <br />