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Sheet 1 of 2 <br /> <br />area coon( <br />ng method <br />call or benr <br />Task # : 128 State :Colorado PermiUob # : C-1981.010 <br />Date: 01/192006 County:Moflat Abbreviation :none <br />User : JHB Site :Trapper Mine Filename : CO10-128 <br />Agenq or organization name :Colorado Division Of Minerals 8 Geology <br />Permit or other job action : Tr-96 <br />Task description :Cast Blast F pit Dipline Highwall (805,558 cy, Ta61e 1.421 <br />UNIT <br />Highwall or bench length 5,800 t <br />Highwall or bench width (from vertical line at base of desired cut on highwall face) 150 eet <br />Highwall or bench height (from pit flow to crest) 140.0 eet <br />Deoth to base of wt at highwall face 75.0 eet <br />BLAST AREA VOLUMES <br />UNIT <br />Total volume of dimensional mass to be shot 779, <br />Blast volume to subdrill grade and blast pattern lines 677, <br />Blast volume !o finish grade and blast pattern lines 677, <br />Remaining volume required to be re-shot or ripped 101, <br />BLAST AREA DESIGN <br />i`.~ <br /> QUANTITY UNIT <br />Rewmmended blasthole diameter 10.00 inches, . <br />Selected blasthole diameter 10.62 inches <br />Subddlling allowance 0.0 et <br />Blasthole depth (avg. depth of holes on wedge-shaped mass) 25.9 et <br />Density of rock Cast blasting (AN ck density <br />Burden to Charge Diameter Ratio NA-user data Imes diameter <br />Burden 30.0 eet <br />Spacing to Burtlen Ratio NA-user data imes burden <br />Spacing 30.0 eet <br />Cubic yards of rock per blasthole (avg, quantity per hole on wedge-shaped mass) 677.64 cubic yams <br />Powder factor description Cast blasting rode sVength <br />Powder factor 2150 pounds/cu.yd. <br />Density of blasting agent O.B5 grams/cc <br />Quantity of explosives per blasthole (avg. quantity per hole on wedge-shaped mass) 1,886.92 ounds <br />Height of powder column per blasthole (avg. height per hole on wedge-shaped mass) 57.75 eet <br />Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) -31.88 eet <br />Stemming to burden ratio (avg, ratio per hole onwedge-shaped mass) -1.06 imes burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) -0.7269 bic yards <br />Number of rows 4 rows <br />Number of blastholes per row 193 holes per row <br />Total number of blastholes 772 holes <br />Total length of all blastholes 19, 976 eet <br />~~ p n~-el tX V'~ <br />CIRCES Cost Estlmatina Software <br />