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sheet 1 of 2 <br /> CIRCES Cost Estimating Software <br />• SURFACE BLASTING WORK <br /> li I ~ „i ,•i;; .I <br /> PROJECT IDENTIFICATION <br /> Task # : 022 State :Colorado PenniVjob # : C-1980A05 <br /> Date ; 12/02/2005 County : Rouft Abbreviation :none <br /> User : ~ SLB SNe :Seneca li Mine Filename : 0005-022 <br /> Agency or organization name : CDMG <br /> Permit or other job action :Technical Revision 37 <br /> Task description :Drill and shoot Wadge highwall (SCC Tasks WA-3 and WA-4) <br /> <br />BLAST AREA DIMENSIONS <br /> QUANTITY ~ UNIT <br />Blast area configuration description Wedge-shaped mass <br />Blasting method description Conventional suAace blast <br />HighwaN or bench face angle 1.00 :1 v <br />Regraded slope angle 2.00 h:1 v <br />Highwall or bench length 1,000 eet <br />Htghwall or bench width (from vertical line at base of desired art on highwall face) 40 eet <br />HighwaN or bench height (from pit floor to nest) 41.0 eet <br />Depth to base of cut at highwall face 20.0 eet <br />BLAST AREA VOLUMES <br />mass to be shot <br />• Total volume of dimes <br />Blast volume to subdi <br />Blast volume to finish <br />Remaining volume re <br />• <br />and blast paltem lines <br />to be re-shot or ripped <br />N~Iie; . <br />QUANTITY J UNIT <br />7.407 cubic vard <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 2.67 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) 10.0 e[ <br />Density of rock vemge Density R rock density <br />Burden to Charge Diameter Ratio 25 imes diameter <br />Burden 19.0 eet <br />Spacing to Burden Ratio 1.5 mes burden <br />Spacing 29.0 1 <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 53.70 wbic yards. <br />Powder factor description Medium rock strength <br />Powderfador D.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) 30.88 pounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 1.32 t <br />Height of stemming per blasthole (avg. height per hole onwedge-shaped mass) 8.68 eet <br />Stemming to burden ratio (avg. ratio per hole onwedge-shaped mass) 0.46 ~mes burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.1421 bic yards <br />Number of rows 1 rows <br />Number of blastholes per row 34 holes per row <br />Total number of blastholes 34 holes <br />Total length of all blastholes 340 eet <br /> <br />~ 3 ~/-- 3~ <br />