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<br />• <br /> <br />Sheet 1 of 2 <br />CIRCES Cost Estimating Software <br />SURFACE BLASTING WORK <br />I .g .a ,~s~ :~~~:~~ `, x `~ iltl~ll~I`II',IIlI~~L'I`Ii99lfll~'llllll~iil:~-'r~. ~~~f~~~ ~::~~.~~ ~.~~~, ... <br />PROJECT IDENTIFICATION <br />Task # : 001 State :Colorado Penn~ob # : C-1981-008 <br />Date : 02/01!2007 County :Gunnison Abbreviation :none <br />User : SLB Site :New Horizon Mine Filename :0008-001 <br />Agency or organization name : CDRMS <br />Penng or other job action :Technical Revision No. 54 <br />Task description :Drill and Shoot pit highwall <br />rr <br />51 .I i 11~'-:kr lL~~~.. ~~~ ~I V'% i i I i III ~i i ~I'' ~-n i~ I'F .. a . <br />BLAST AREA DIMENSIONS <br /> QUANTITY UNIT <br />Blast area configuration description Wedge-shaped mass <br />Blasting method description Casf blast <br />Highwall or bench face angle 0.00 :1 v <br />Regraded slope angle 5.00 :1 v <br />Highwall or bench length 3,778 <br />Highwall a bench width (from verticel line at base of desired art on highwall face) 80 set <br />Highwall or bench height (from pit goon to asst) 79.0 t <br />Depth to base of cut at highwall face 16.0 <br /> <br />BLAST AREA VOLUMES <br />Total volume of dimensional mass to be shot <br />UNIT <br />Blast volume a finish grade and blast pattern Tines 73,429 bit yards <br />Remaining volume required to be reshot a dpped 16,124 bic yards <br />I 1 ; i:: I i i 1, s~~F:ii'i C . R~I~ ~1 ;. li ' I ,Lh, !li <br />BLAST AREA DESIGN <br /> QUANTITY UNIT <br />Recommended Dlasthole diameter 2.13 nches <br />Selected blasthde diameter B.00 nches <br />Subddlling allowance 0.0 eet <br />Blasfhole depth (avg. depth of hdes on wedge-shaped mass) 9.2 eet <br />Density of rock ~ NA-user data density <br />Burden to Charge Diameter Rego 33 'mss diameter <br />Burden 17.0 t <br />Spacing to Burden Rata ~ 1.1 'mss burden <br />Spacng 19.0 <br />Cubic yards of rodr per bYasthole (avg. quantity per hole on wedge-shaped mass) 130.40 bic yards <br />Powder factor description Medium strergth <br />Powder factor 0.575 unds/w.yd. <br />Density of blasting agent 0.85 rerttslcc <br />Quantity of expktsives per blasthole (avg. quantity per hole on wedge-shaped rgass) 74.98 unds <br />Height of powder column per blasthde (avg. height per hole on wedgeshaped mass) 7.20 <br />Heigh of stemming per blastirole (avg. height per hole on wedge-shaped mass) 2.00 t <br />Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass) ~ 0.12 'mss burden <br />Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.0148 bfc yards <br />Number of rows ~ 3 <br />Number of blastholes per row 198 es row <br />Total number of bWStholes 594 oles . <br />Total length of all blastholes 5,465 <br />i i ~ ~ :~ uiY~~u~u~aos~um~~utt~ , -,! ~ ~ rt~~~ ~ ~))~~~~ut<JU~in ~I,i, ~'~tla ~ i ~ ::. <br />(Revised 24May07) Attachment 3.02.2-2-12 <br />