2001-12-11_PERMIT FILE - C1980007A ‎(2)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: By TOC Deleted
• Section_Exhibit Name: Exhibit 40 Geotechnical Analysis B & F Seams
• Media Type: D
• Archive: Yes

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L_J
TABLE 3.4.A.19
FILLAR SIZE AND FACTOR OF SAFETY-AREA-III-
LONGWALL MINING
April 1989

Pillar
Analyzed Pillar
Width x Length
(ft x ft) Factor
of
Safety Recommended
Pillar
Width x Length
(ft x ft)
B SEAM '-- ----- --
Mains 80 x 110 1.3 80 x 120
Barrier 7.50 x 700 1.9 250 x 120
Gate 40 x 100 .80 45 x 100
Bleeder 120 x 120 1.2 1.1` 120 x 120
Starting
room barrier
140
x
700
1.1+
140
x
700
~-
E SEAM - - -----
Mains 60 x 120 1.4 80 x 17.0
Barrier 7.00 x 700 1.9 370 x 700
Gate 30 x 100 ~.85 40 x 100
Bleeder 90 x 100 1.5-.9+ 90 x 100
Starting
room barrier
110
x
700
N/A-1.0+
240
x
700

r------~---
F SRAM
-----
-
-------
-- -- _-
Mains ~ 60 x 120 1.5 80 x 120
Barrier 200 x 700 1.9 410 x 700
Gate 30 x 100 .9 35 x 100
Bleeder 90 x 100 1.5-.9+ 90 x 100
Starting
room barrier
110
x
700
N/A-1.0
410
x
700
+ = Lagging cave
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