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sheet 1 of 2 <br />CIRCES Cost Estimatina Software <br />SURFACE BLASTING WORK <br />PROJECT IDENTIFICATION <br />Task #: 004 State : Colorado Permit1job # : C-1982-057 <br />Date : 03/15!2010 County : Routt Abbreviation : none <br />User : JRS Site : Seneca li-W Mine Filename : C057-004 <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 Shoor South Sage Creek Pit 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 0.50 h:1v <br />Regraded slope angle 1.00 h:1v <br />Highwall or bench length 1,600 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) 50.0 feet <br />Depth to base of cut at highwall face 40.0 feet <br />BLAST AREA VOLUMES <br />QUANTITY UNIT <br />Total volume of dimensional mass to be shot 23,704 cubic yards <br />Blast volume to subdrill grade and blast pattern lines 5,911 cubic yards <br />Blast volume to finish grade and blast pattern lines 5,911 cubic yards <br />Remaining volume required to be re-shot or ripped 17,793 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 R rock density <br />Burden to Charge Diameter Ratio 25 times diameter <br />Bunsen 19.0 feet <br />Spacing to Bunsen 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 grams/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 76 holes per row <br />Total number of blastholes 76 holes <br />Total length of all blastholes 1,520 feet <br />..:?.,... ; . , .