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

•
•
TABLE 3.4.A.22
PILLAR SIZE AND FACTOR OF SAFETY-AREA IV-
ROOM-ARID-PILLAR MINING
April 1989
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 2.1 60 x 100
Barrier 2 rows of 2 rows of
].00 x 90 2. 1. 100 x 80
In-panel
cltai.tt 50 x 100 1 . S 50 x 80
In--panel
bat.tiet.• 90 x L+ 2.3 80 x L+

--.
E SEAM - ----- -- --- ---
Mains 60 x 120 2.5 ~ 60 x 100
Barrier tl/A N/A A row of 100 x
80 and a row of
100 x 140
In--panel
cltaitt 50 x 100 2.7. 50 x 100
Iti-panel I
barrier __1 _~ N/A TI/A 200 x L+
F SEAM
Mains 60 x 120 2.9 60 x 100
Barrier N/A N/A A row of 100 x
80 and a row of
100 x 160
In-panel
chain 50 x 100 2.6 40 to 50 x 100
In-panel
barrier N/A N/A 240 x L+
L+ = Pastel length
•