PERMFILE127550

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 10/6/2004
• Doc Name: Highwall Mining Ground Control Plan
• Section_Exhibit Name: Tab 12 Attachment 12-3
• Media Type: D
• Archive: No

•
~cnc:v Cual lompan} Iliahicall \tunnc AJciurdun~
~~9~IfA LU, u5.u0304 >tnreh 15.:nna
~1'ch Pillar Width - VI'adgc and V1 t-If'G•eck Seams
Design Mini n Hei ht, ft
Depth of
C
over, ft 4 5 6 7 6 7 8 9 10 10.5 15 20 25
~
n
aV (1 i5 3~~' 41 '~1 .111 Jti ti .'(f ~' frA .V'1 '/!•
85 36 .?9 a3 a6 J6 J4 i;~ ~A i7 -, ~~'~ 1"-
120 42 44 ~? cl S/ 5: +.~ al F3 '~' q4 11r;
155 50 53 55 57 55 57 Sv n3 r;' h0 ,14 101 ;1"
190 57 60 n3 66 b3 GG o8 71 - i4 '~1 109 1~5
225 63 ti8 '? 75 - 75 ^•S 81 83 85 45 11G l33
260 7n 75 sn 8.1 Sn 8a 88 92 ~>5 96 I n % 15 143
295 ?6 83 SS 97 s8 97 98 Ip'_ Itth 108 122 Li4 153
330 5] 90 ',fi Ib2 ~a• 102 107 112 11- 119 I?6 152 Ib•i
365 R8 97 1i~7 III 103 I11 117 123 i_R 131 I51 I70 185
400 '%! 103 1i7 119 ilk 119 i~' 133 i~4 IA2 Ian 188 _Q'
435 lutr Iln 12n 128 I,U 128 13n la3 i~r' ISa 18I 207 ~m
470 loci 117 I'% 137 I:'.? 137 135 154 n~ 16c u,(, 22h ~c;
l I
•
Coal strength, psi 1035 Mining width, ft 11.50 No. web pillars 19
Pillar widths rn itai;cs have width-to-heght ratios of less than 0 5
Mining
He'nhl
It
~- 4
5
-3c- 6
t7
-- 6
7
8
i,-s- 9
-10
t 10.5
- 15
20
25
°---
0 50 tUC +5~ 200 250 ?AO 350 a00 X50 SP;:
DEPTH OF COVER, n
higure 34a- W'cb pillar design chars for \tl'ndgo and 1k'olf Creek seams. St:neca I1-\~
and Yoast Pits.