2011-02-14_PERMIT FILE - C1980007A ‎(3)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 2/14/2011
• Doc Name: SUBSIDENCE EVALUATION
• Section_Exhibit Name: Exhibit 60E Subsidence Evaluation for the South of Divide and Dry Fork Mining Areas
• Media Type: D
• Archive: Yes

TABLE 1
MAXIMUM SUBSIDENCE PARAMETERS
FROM WEST ELK MINE SUBSIDENCE MONITORING NETWORK
•
Parametw- :
ILonpltud(nsl'F"fil
Lonplgaldb
�
> TranswnN Protll� .
P L
>so: End 1 iNW
1
A4ovo 2.3 NW �W-
W/d
750/1240 =0.6
750/1350 =0.56
2 NW: 750/1000 =0.75
3 NW: 750/900 =0.83
a =S t
N/A
N/A
0.20 to 0.35
a =Sdt
6.94/12 =0.58
6.06/11.5 =0.53
2 NW: 0.62
3 NW: 0.58
S
0.005597
0.004489
2 NW: 0.00729
3 NW: 0.00762
S,,dd
0.000004514
0.000003325
2 NW: 0.00000729
3 NW: 0.00000847
M
0.015
0.014
2 NW: 0.014
(2.7- S./d)
(3.1 -S
3 NW: 0.021
(,)
C "'
0.000065
0.000060
2 NW: 0.00022
(14.4- S
(18.0- S,,,/d
3 NW: 0.00014
-0.000111
-0.000066
2 NW: -0.00025
(- 24.6 -Sad
(- 19.9•Sdd
3 NW: -0.00012
E
0.0070
0.0058
2 NW: 0.0102
(1.25-Sdd)
(1.3 -Sdd)
3 NW: 0.0085
-0.0047
-0.0009
2 NW: - 0.0236
(- 0.8 -S,/d)
(- 0.2 -Sdd)
3 NW: - 0.0307
Maximum
80 feet
100 feet
50 feet
Crack Depth ( 2)
Break Angle (3)
32percent
42percent Slope -
-
Slope -
3° Slope in opposite
-9 Slope in same
Direction to tilt
Direction as tilt
Angle of
17 °(4)
15 0( 4)
-
DravP
Notes:
(1) Numerical curvature values are in radians per foot (tad /ft).
(2) Maximum crack depth is projected for hard, brittle sandstones; depth is expected to be much less, or non - existent, in
soft, ductile shales and claystones.
(3) Measurement from vertical reference.
(4) Measurement takes into account influence of development entries, chain pillars, and prior F -seam mining.