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CIRCES Cost Estimating Software <br />SURFACE BLASTING WORK <br />sheet 1 of 2 <br />PROJECT IDENTIFICATION <br />Task # : - 001 State : Colorado PermitrJob #: C-1982-057 <br />Date 08/05/2008 - County :Rouff <br />_ - Abbreviation :none <br />_ <br />User: JRS Site : Seneca li-W - Filename : C057-001 <br />Agency or organization name : Colorado Division Of Reclamation. Mining And Safety <br />_ <br />. <br /> <br />Permit or other job action :2008 Midterm Review ._.._.._...__ <br />-_.-_ <br />Task description : Drill and Shoot A Pit Highwall <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:1v <br />Regraded slope angle - --------- - --__.._.._. <br />.. ! 1.00 h:1v <br />------------------ <br />_ <br />Highwall or bench length_ ------.__.._...__.._..... <br />1,500 feet <br />Highwall or bench width (from vertical line at base of desired cut on hig hwall face) <br />40 :feet <br />Highwall or bench height (from pit floor to crest) - <br />65.0 feet <br />Depth to base of cut at highwall face 40.0 feet <br />BLAST AREA VOLUMES <br />Total volume of dimensional mass to be shot <br />QUANTITY UNIT <br />-... ----------- --... <br />Blast volume to subdrill grade and blast pattern lines _.._ <br />21,006 <br />cubic yards <br />Blast volume to finish grade and blast pattern lines -17,719 cubic yards <br />Remaining volume required to be re-shot or ripped 39,941 cubic yards <br /> <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 5.88 inches <br />Selected blasthole diameter 9.87 :inches <br />Subdrilling allowance - <br />- <br />63 feet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass 26.3 feet <br />Density of rock <br />-- R <br />Average _Density <br />+rock density <br />-- <br /> <br /> <br />Burden to Charge Diameter Ratio _ <br /> <br />25 _ <br />-- <br />---...----.....- <br />'times diameter <br />__ ----- -..._ ..... ........ ........ _.__-- --_._._ <br />Burden <br />...... ._..... <br />. <br />21.0 <br />;feet <br />Spacing to Burden Ratio 1,1 'times burden <br />Spacing -- ---- 23.0 feet <br />Cubic yards of rock per blasthole (avg_ quantity per hole on wedge-shaped mass) <br />- 147:30 cubic yards <br /> <br />Powder factor description <br />Medium -- <br />rock strength <br />._....._.._- <br />Powder factor <br />_-_ _ ---.._- <br />_ <br />0.575 <br />poundsicu.yd. <br />Density of blasting agent 0.85 rams/cc <br />Quantity of explosives per blasthole (avgquantity per hole on wedge-shaped mass) 0.00 pounds <br />---- ---- -- <br />Height of powder column per blasthole (avg height per hole on wedge-shaped mass) ---- ----- <br />3-00 <br />feet <br /> <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) - <br />23.30 - <br />feet <br />Stemming to burden ratio (avg, ratio per hole on wedge-shaped mass) 1.11 limes burden <br />-- <br />Quantity of stemming per blasthole (av9 quantity per hole on wedge-shaped mass) -- <br />0.00000 <br />- cubic yards <br />Number of rows r <br />0 :rows <br /> <br />Number of blasthotes per row <br />65 - ----- <br />holes per row <br />Total number of blastholes 0 'holes <br />Total length of all b4astholes 1,710 feet