PERMFILE47424

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 10/6/2004
• Doc Name: Geotechnical Design & Operational Considerations for Highwall Mining, IIW & Yoast Areas
• Section_Exhibit Name: Tab 12 Attachment 12-3 Part 2
• Media Type: D
• Archive: No

V1'cb Pillar- ~~'idth - ~1'adre and ~'1 olf ('reek Scams
Design Minin Height,tt
Depth of Cover, ft 4 5 6 7 6 7 6 9 10 10.5 15 20 25
50 .1 35 ?,r al 3b' a! di a~ to 51 aG 6l
85 ~/; ,i% :i aG Jj aG 1'J Si j/> Sj '~ ,~'? ;rl'
120 a. a:5 sl a? sl s.r SF !~1 (,i ?>` ya ;!(i
155 >'~ .3 iS 57 ij j7 i9 I: G? !,9 ~,1 101 "'
190 >? 60 63 bb 63 66 68 71 74 S+1 105+ !_'s
225 6? 68 i2 75 73 75 i8 81 84 85 9fl lIG la
260 '~~ 75 Si' 84 80 84 8S 92 '» 96 10% J.S la.<
295 7d 83 88 93 88 93 V8 102 Ici6 108 I'_1 134 !?~
330 82 90 '~F I(12 `>~ 1112 IV7 112 117 119 176 152 ir.d
365 88 97 lu4 III 104 III 117 123 I_k 131 I>I 170
400 •~•t IG3 I I_ 119 I I: I I'> I_7 la? I ~'i 142 I6ti 188 '~''
435 i~"~ IIn I_r'~ 128 I., l:~ i]a la? i;t' I54 I81 207 ',~~
470 I'~'~~ 117 I.' 137 I.` 1;7 I:~ 1~~1 It~_ 165 I•+n 226
....... .... ~..y.... r•.. •..~.. .........y ........, .. . ~,.. nv. v~eu pn~a~~ i:•
Pillar widths in italics have width-to-height ratros of less than 0.5
24
e
0
3
a
a
J
J
n
m
W
3
O
W
rc
5
0
a
-,
Mminp
J
20 Height,
R
to + 4
16 ~ 5 •
~ --~- 6
t4 ~
4 -+ 7
t: n -8
m
W
3 ~
10 ~
a B
5
e ~ -~- 9
--~- 10
6
4 _ 1 ~,
Z 20
2 r.
0
_ 1
Fiuure ?4a- 1'i`rb pillar di Vii; n rhans tirt \\'a~iuc ;roil \1 ~~It (•rcrk ~t•;im.. ti~ '~,:a 11-~' [„{•;/„''/"'t. /,
and 1'nast Pn~
0 50 100 15D S•00 :50 :AtO 350 40p a50 500
OEPTH OF COVER. h