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sheet 1 of 2 <br />• <br />PROJECT IDENTIFICATION <br />CIRCES Cost Estimating Software <br />Task # : 001 State :Colorado PermiUjob # : C-82.057 <br />Date: 0628/2004 County:Routt Abbrevia[ion:none <br />User : JRS Site :Seneca li-W Mine Filename :C057-001 <br />Agency or organization name :Colorado Division Of Minerals And Geology <br />Permit or other job action :Permit Revision 04 <br />Task description :Drill and Shoot A Pit Highwall <br />QUANTITY I 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 1,500 eet <br />Highwall or bench width {from vertical line at base of desired cut on highwall face) 40 eet <br />Highwall or bench height (from pit floor to crest) 65.0 eet <br />Depth to base of cut at highwall face 40.0 eet <br />BLAST AREA VOLUMES <br />UNIT <br />Total volume of dimensional mass to be shot <br />• Blast volume to subdrill grade and blast pattern lines <br />Blast volume to finish grade and blast pattern lines <br />Remaining volume required to be re-shot or ripped <br />RLAST AREA DESIGN <br />u <br /> QUANTITY UNIT <br />Recommended blasthole diameter 5.33 inches <br />Selected blasthole diameter 9.00 inches <br />Subdrilling allowance 0.0 eet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 20.0 eet <br />Density of rock verage Density R rock density <br />Burden to Charge Diameter Ratio 25 imes diameter <br />Burden 19.0 eet <br />Spacing to Burden Ratio 1.1 imes burden <br />Spacing 21.0 eet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 77.7$ 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/oc <br />Quantity of explosives per blasthole (avg. quantity per hole on wedge-shaped mass) 44.72 ounds <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 eet <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 71 holes per row <br />Total number of blastholes 71 holes <br />Total length of all blastholes 1,420 eet <br />