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
C~
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TABLE 3.4.A
FILLAR SIZE AND FACTOR OF
ROOM-AND-PILLAR
20
SAFETY-AREA III-
MIDIING
Factor Recommended
Pillar Analyzed Pillar of Pillar
Width x Length Safety Width x Length
(ft x ft) (ft x ft)
r
1 B SEAM
Mains 80 x 110 1.3 80 x 120
Barrier 200 x 380 1.6 220 x 380
In-panel
chain 65 x 100 1.1 70 x 100
In-panel
barrier 150 x L+ 1.5 150 x L+
~E SEAM
Mains 60 x 120 1.4 80 x 120
Barrier 2 rows of
120 x 100 ti 1.6 340 x 380
In-panel
cliait~ 60 x 100 1.4 60 x 100
In-panel
Barrier 120 x L+ 2.0 390 x L+
F SEAM ----- - ----- --- -~ --
Maids 60 x 120 1.5 80 x 120
Barrier 2 tows of
120 x 100 ]..6 380 x 380
In-panel
chains 60 x 100 1.4 60 x 100
Iu-panel
barrier 120 x L+ 2.0 470 x L+
^~= Approximately
L+ = Panel length
ti