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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 PermiUjob # : C-1982-057 <br />Date : 0810512008 County :Routt Abbreviation : none - <br />User : JRS Site : Seneca li-W <br />- <br />Filename : C057-004 -- <br />_ <br />_ <br />Agency or organization name : Colorado Division Of Reclamation, Mining And Safety <br />Permit or other job action : 2008 Midterm Review - - -- - <br />Task description : Drill and Shoot South Sage Creek Pit Hfghwall <br /> <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:1 v <br />Regraded slope angle 1.00 h 1 v <br />Highwall or bench length <br />_-.-?-g ? <br />1'600 <br />feet <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) <br />- ------? -_ -_._ - _ <br />T _. <br />---- <br />40 feet <br />__., --- -- <br />Highwall or bench height (from pit floor to crest) ---------- <br />50.0 -- -----._._.._--- ....------ - <br />feet <br />Depth to base of cut at highwall face 40.0 ;feet <br /> <br />BLAST AREA VOLUMES <br /> QUANTITY i UNIT <br />Total volume of dimensional mass to be shot 23,704 cubic yards <br />Blast volume to subdrill grade and blast pattern lines i -22,299 cubic yards <br />Blast volume to finish grade and blast pattern lines -16,609 cubic ands <br /> <br />Remaining volume required to be re-shot or ripped <br />42,513 ___ <br />cubic yards <br /> <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 5.88 inches <br /> <br />Selected blasthole diameter i -- ---- - <br />9.87 <br />'inches <br />Subdrilling allowance 6.3 fleet <br />Blasthofe depth (avg depth of holes on wedge-shaped mass) 26.3 feet <br />Density of rods ;A verage Density Rtrock density <br />Burden to Charga Diameter Ratio - <br />25 t: - <br />m <br />d <br /> <br /> <br />Burden <br />---- <br /> <br />21.0 t <br />i <br />es <br />iameter <br />:feet <br />Spacing to Burden Ratio times burden <br />Spacing <br />- --.__ <br />23.0 - <br />!feet <br />Cubic yards of rock <br />_..._... ------... _-per blasthole (avg quantity per hole on wedge-shaped mass) <br />_ <br />147.30 b <br />cubic yards..... <br />Powder factor <br />description Medium rock strength <br />Powder factor 0,575 pounds/cu d <br />Density of blasting agent 0 <br />85 gramstcc <br />Quantity of explosives per blasthole (avg quantity per hole on wedge-shaped mass) <br />. _ <br />000 <br />.._ founds <br />Height of powder column per blasthole (avg height per hole on wedge-shaped mass) 3.00 feet <br />Height of stemming per blasthole (avg height per hole on wedge-shaped mass) 23.30 !feet <br />-- <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) 1.11 `times burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0-0000 ;cubic yards <br />Number of rows 0 ;rows <br />Number of blastholes per row 69 holes per row <br />Total number of btasthoies 0 holes <br />Total length of all blastholes 1,815 ;feet