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
• TABLE 3.4.A.24 - ~
PILLAR SIZE AND FACTOR OF SAFETY-AREA V-
ROOM-AND-PILLAR MINING
C~
J
Factor Recommended
Pillar Analyzed Pillar of Pillar
Width x Length Safety Width x Length
(ft x ft) (ft x ft)
~EAM -- -
Mains 60 x 120 1.9 60 x 120
Barrier 2 rows of 2 rows of
120 x 100 1.9 120 x 100
In-panel
chain 50 x 100 1.6 50 to 60 x 100
Itt-panel
barrier 120 x LF 7..3 110 x "L+
r
F SRAM --_
L - -^---- _-
Mains ~ 60 x 120 2.1 60 x 120
Barrier 2 x'ows of A row of 120 x
100 x 90 7..1 100 and a row
of 120 x 150
In--panel
chain 50 x 100 1.5 50 x 100
In-panel
barrier 90 x L+ 2.3 210 x L+
I,+ = Panel ].engtit
r 1
LJ