2008-07-29_PERMIT FILE - C1981010A ‎(11)‎

• Permit No: C1981010A
• IBM Index Class Name: Permit File
• Doc Date: 7/29/2008
• Section_Exhibit Name: Appendix A Circes Estimatating Forms
• Media Type: D
• Archive: Yes

sheet 1 of 2
I . SURFACE BLASTING WORK
PROJECT IDENTIFICATION
Task # : 127 Slate :Colorado PermiUob # :C1981-010
Date : 01/19!1006 County : Mot/af Abbreviation :none
User : JHB Site :Trapper Mine Filename : C010.127
Agency or organization name :Colorado Division O/Minerals And Geology
Permit or other job action :Tr-96
Task description :Cast blast G-dip highwall
Total volume of dimensional mass to be shot
Blast volume to subdrill grade and blast patte
Blast volume to finish grade and blast pattern
Remaining volume required to be re-shot or r
QUANTITY f UNIT
BLAST AREA DESIGN

OUANTITY UNIT
Recommended blasthole diameter 6.33 'nches
Selected blasthole diameter 10.62 inches
Subdrilling allowance 0.0 eet
Blasthole depth (avg. depth of holes on wedge-shaped mass) 15.5 eet
Density of rock Cast blasting (AN rock density
Burden to Charge Diameter Ratio 20 imes diameter
Burden 18.0 get
Spacing to Burden Ratio 1.1 imes burden .
Spacing 20.0 eet
Cubic yards of rock per blasthole (avg. quantity per hole an wedge-shaped mass) 213.45 cubic yards
Powder factor description Cast blasting rock strength
Powder factor 2.150 pounds/cu.yd.
Density of blasting agent 0.85 grams/cc
Quantity of explosives per blasthole (avg. quantity per hole on wedge-shaped mass) 458.92 nds
Height of powder wlumn per blasthole (avg. height per hole on wedge-shaped mass) 14.05 eet
Height of stemming per blasthole (avg. height per hole on wedge-shaped mass) 1.49 eet
Stemming to burden ratio (avg. ratio per hole on wedge-shaped mass} 0.08 imes burden
Quantity of stemming per blasthole (avg. quantity per hole on wedge-shaped mass) 0.0339 ubic yards
Number of rows 6 rows
Number of blastholes per row 206 holes per row
Total number of blastholes 1,236 holes
Total length of all blastholes
n A .... 19,199 et

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