PERMFILE134368

• Permit No: C1981022
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Water Communication Potential from Overlying Workings /Abel, 1992
• Section_Exhibit Name: Exhibit 2.04-E4 Part 6
• Media Type: D
• Archive: No

00
August 21, 1992

• Subsidence(%)=+8.469+11.951n~
2
r
=0.949 Syx=4.77%
_ KD
Lmax- ~_ R D=Depth (I
R =Extraction Ratio

• H =Mining Height (m )
W =Pillar Widti~ (m)
K = 0.0226MP°/m

20 40

n)
60 80 100
L max~H~V1~
Sanborn Creek Project
Paqe 20
Appendix -TROUGH SUBSIDENCE CALCfJLATION SHEETS
70
60
rn
50
rn
.~
~ 40
0
0
v
~ 30
v
20
10
Subsidence above room-and-pillar worfcings following pillar
squeeze or failure.