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sheet 1 of 2 <br />CIRCES Cost Estimating Software <br />• SURFACE BLASTING WORK <br />+41i; ~iflla~ I~ II ~!;, RP ~:I <br />PROJECT IDENTIFICATION <br />Task # : 021 State :Colorado <br />Date : 12/02/2005 County : Routt <br />User : SLB Site :Seneca li Mine <br />Agency or organization name : CDM6 <br />Permit or other job action :Technical Revision 37 <br />Task description :Drill and shoot Woff Creek <br /> i ~.:. ,. <br />BLAST AREA DIMENSIONS <br />iighwall (SCC Tasks WC-3 and WC-4) <br />,,, <br /> QUANTITY ~ UNIT <br />Blast area configuration description rWedge-shaped mass <br />Blasting method description Conventional surface blast <br />Highwall or bench face angle 1.00 h:1v <br />Regraded slope angle 2.00 h:1v <br />Highwall or bench length 2,000 eet <br />Highwall or bench width (from vertical line at base of desired cut on highwatl face) 114 t <br />Highwall or bench height (from pit floor to crest) 75.0 eet <br />Depth to base of cut at highwall face 570 eet <br />BLAST AREA VOLUMES <br />Total volume of dimensional mass to be shot <br />• Slast volume to subddl! grade and blast pattern lines <br />Blast volume to finish grade and blast pattern lines <br />Remaining volume required to be re-shot or ripped <br />BLAST AREA DESIGN <br /> <br />QUANTITY I UNIT <br />88, 986 <br /> QUANTITY UNIT <br />Recommended blasthole diameter 7.60 inches <br />Selected blasthole diameter 9.00 'nches <br />Subdrilling allowance 0.0 t <br />Blasthole depth (avg. depth of holes on wedge-shaped maaa) 14.2 et <br />Density of rock verage Density R rock density <br />Burden to Charge Diameter Ratio 25 'mes diameter <br />Burden 19.0 eet <br />Spacing to Burden Ratio 1.5 'mes burden <br />Spacing 29.0 t <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 327.16 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 e~losives per blasthole (avg. quantity per hole on wedge-shaped mass) 18B.11 ounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shapetl mass) 8.02 et <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) 6.23 eet <br />Stemming to burden ratio (avg. ratio per hole onwedge-shaped mass) 0.33 'mes burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.1019 bic yards <br />Number of rows 4 rows <br />Number of blastholes per row 68 holes per row <br />Total number of blastholes 272 holes <br />Total length of all blastholes 3,876 et <br /> <br />Permifllob # : C-1980-005 <br />Abbreviation :none <br />Filename :0005-021 <br />jell <br />~~-/- 3~ <br />