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sheet 1 of 2 <br />I ~ CIRCES Cost Esttmatlna Software <br />SURFACE BLASTING WORK <br />Task 1f : Y29 State :Colorado PermiUob A: C-1981-010 <br />Date : 01/062006 County :Moffat Abbreviation :none <br />User: JHB Site :Trapper Mine Filename:C010-128 <br />Agency or organization name :Colorado Division Of Minerals 8 Geology <br />Permit or other job action : Tr-96 <br />Task description :Cast Blast East FPit /rlghwall ~' p i <br />QUANTITY ~ <br />dge-shaped mass <br />.t blast <br />0.71 h:' <br />Blast area <br />125 <br />rn.. M(i <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 100 eet <br />Highwall or bench height (from pit floor to nest) 100.0 _ <br />Depth to base of cut at highwall face 50.0 eet <br />BLAST AREA VOLUMES <br />Total volume of dimensional mass to be <br />Blast volume to subdrill grade and blast <br />Blast volume to finish grade and blast p. <br />Remaining volume required to be re-shr <br />UNIT <br />754 <br />BLAST ARFA DESIGN <br /> <br /> QUANTITY UNIT <br />Recommended blasthole diameter 8.87 inches <br />Selected blasthole diameter 10.82 inches <br />Subdrilling allowance 0.0 t <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 17.2 eet <br />Density of rock Cast blasting (AN rock density <br />Burden to Charge Diameter Ratio NA-user data imes diameter <br />Burden 30.0 eet <br />Spacing to Burden Ratio NA-user data imes burden <br />Spacing 30.0 eel <br />Cubic yards of rock per blasthole (avg. quantity per hole on wedge-shaped mass) 520.08 bic yards <br />Powder factor description Cast blasting rock strength <br />Powder factor 2.150 pounds/cu.yd. <br />Density of blasting agent 0,85 ramsfcc <br />Quantity of explosives per blasthole (avg. quantity per hole on wedge-shaped mass) 1,118.18 ounds <br />Heigh of powder column per blasthole (avg. height per hole on wedge-shaped mass) 34.22 eet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) -18.97 eet <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) -0.57 imes burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) -0.3871 bic yards <br />Number of rows 3 rows <br />Number of blastholes per row 137 holes per row <br />Total number of blastholes 411 holes <br />Total length of all blastholes 7,090 eet <br /> <br />