Laserfiche WebLink
sheet 1 of 2 <br />CIRCES Cost Estimating Software <br />SURFACE BLASTING WORK <br />PROJECT IDENTIFICATION <br />Task # : 004 State : Colorado Permit/job # : C-1981-008 <br />Date : 0512612009 County: Montrose Abbreviation : none <br />User : SLB Site : New Horizon Mine Filename : 0008-004 <br />Agency or organization name : CDRMS <br />Permit or other job action :Permit Renewal No. 5 <br />Task description :Drill and shoot highwall side of pit ramp <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 0.00 h:1v <br />Regraded slope angle 5.00 h:1v <br />Highwall or bench length 619 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) 79.0 feet <br />Depth to base of cut at highwall face 8.0 feet <br />BLAST AREA VOLUMES <br />QUANTITY UNIT <br />Total volume of dimensional mass to be shot 3,668 cubic yards <br />Blast volume to subdrill grade and blast pattern lines 1,761 cubic yards <br />Blast volume to finish grade and blast pattern lines 1,761 cubic yards <br />Remaining volume required to be re-shot or ripped 1,907 cubic yards <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 1.07 inches <br />Selected blasthole diameter 6.00 inches <br />Subdrilling allowance 0.0 feet <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 4.6 feet <br />Density of rock Low Density Rock rock density <br />Burden to Charge Diameter Ratio 33 times diameter <br />Burden 17.0 feet <br />Spacing to Burden Ratio 1.1 times burden <br />Spacing 19.0 feet <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 75.37 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) 43.34 ounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 4.16 feet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) 0.44 feet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) 0.03 times burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) a0032 cubic yards <br />Number of rows 1 rows <br />Number of blastholes per row 32 holes per row <br />Total number of blastholes 32 holes <br />Total length of all blastholes 147 feet