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sheet 1 of 2 <br />CIRCES Cost Estimating Software <br />SURFACE BLASTING WORK <br />PROJECT IDENTIFICATION <br />Task # : 001 State : Colorado Permit/job # : C-1981-008 <br />Date : 0512612009 County : Montrose Abbreviation :none <br />User: SLB Site : New Horizon Mine Filename : 0008-001 <br />Agency or organization name : CDRMS <br />Permit or other job action : Permit Renewal No. 5 <br />Task description : Drill and shoot pit highwall <br />r? <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 1,320 feet <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 80 feet <br />Highwall or bench height (from pit floor to crest) 79.0 feet <br />Depth to base of cut at highwall face 16.0 feet <br />BLAST AREA VOLUMES <br />QUANTITY UNIT <br />Total volume of dimensional mass to be shot 31,289 cubic yards <br />Blast volume to subdrill grade and blast pattern lines 25,589 cubic yards <br />Blast volume to finish grade and blast pattern lines 25,589 cubic yards <br />Remaining volume required to be re-shot or ripped 5,700 cubic yards <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended blasthole diameter 2.13 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) 9.2 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) 130.40 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) 74.98 pounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 7.20 feet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) 2.00 feet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) 0.12 times burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.0146 cubic yards <br />Number of rows 3 rows <br />Number of blastholes per row 69 holes per row <br />Total number of blastholes 207 holes <br />Total length of all blastholes 1,904 feet