PERMFILE40335

• Permit No: C1981022
• IBM Index Class Name: Permit File
• Doc Date: 1/27/2003
• Doc Name: Predicted D Seam Longwall Subsidence Report 2/26/03
• Section_Exhibit Name: Exhibit 2.05-E8 Part 6
• Media Type: D
• Archive: No

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LIST OF FIGURES
Figure 1. Elk Creek Mine panels, overburden contours and creeks. 6
Figure 2. Theoretical height of collapse chimneys 7
Figure 3. Longwall subsidence overburden deformation zones 8
Figure 4. Strata deformation zones in rock above a longwall
panel. 9
Figure 5. Horizontal deformation and strain locations over
longwall panels. 10
Figure 6. Draw angles with respect to overburden lithology 18
Figure 7. Chimney collapse height cumulative frequency
distribution 22
Figure 8. Subsidence profile construction graph 29
Figure 9. Example Panel #3 subsidence calculation location 30
Figure 10. Example Panel #3 width/height correction factor. 31
Figure 11. Example Panel #3 distance from ribside to 6-ft
subsidence location. 32
Figure 12. Example Panel #3 strain factor graph 33
Figure 13. Predicted low-extraction room-and-pillar subsidence. 39
Figure 14. Predicted surface subsidence for crushing of gateroad
pillars . 40
Figure 15. Landslide area over Panel #1 with predicted subsidence 45
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