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

April 1989
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TABLE 3.4.A.18
PILLAR SIZE ArID FACTOR OF SAFETY-AREA II-
ROOM AND PILLAR MINING
Factor Recommended
Pillar Analyzed Pillar of Pillar
Width x Length Safety Width x Length
(ft x ft) (ft x ft)
B SEAM
Mains 60 x 120 1.5 60 x 120
Barrier 2 rows of 2 rows of
120 x 100 1.6 120 x 100
In-pat~e.l
chain 60 x 100 1.4 60 X 100
In-panel
barrier 120 x L+ 2.0 120 x L+
r
E SEAM
Maids 60 x 120 1.9 60 x 100
Barrier 2 rows of A row of 120
17.0 x 100 1.9 x 100 and a row
of 120 x 180
In-panel
chain 60 x 100 1.6 50 x 100
In-panel
barrer 120 x L+ 2.3 280 x L+
F SEAM ---------
I~--- --

Maids 60 x 80 1.8 60 x 100
Barrier 2 rows of A row of 120
100 x 90 2.1 X 100 and a row
of 120 x 220
In-panel
ck~ain 50 x 100 1.5 50 x 100
In-panel
barrier 90 x L+ 2.3 360 x L+
L+ = Panel length