2021-02-05_PERMIT FILE - C1980007A ‎(5)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 2/5/2021
• 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

FIGURES
Figure 1 E-seam Panel Layout
Figure 2 Conceptual Diagram Showing Subsidence Processes
Figure 3 Diagram Showing Subsidence Profile and Parameters
Figure 4 Graph Showing Subsidence Factors
Figure 5 Graph Showing Maximum Tilt and Horizontal Strain
Figure 6 Comparison of Model Predicted vs. Observed Subsidence
Figure 7 Panels E8 to E1 and B29 to B17—Vertical Displacement
Figure 7A Panels B 13-A to B 12 and E 12 to E 10—Vertical Displacement
Figure 8 Panel E9 Traverse and Panel E6 Longitudinal Profile of Vertical Displacement
Figure 9 Panels SS 1 to SS4—Vertical Displacement
Figure 10 Panels E14 through E6—Vertical Displacement
Figure 11 Subsidence Development Curves
Map 1 Landslides and Rockfalls in the Southern Panels, Apache Rocks West, and Sunset Trail
Mining Areas
TABLES
Table 1 Maximum Subsidence Parameters,West Elk Mine
Table 2 Maximum Subsidence Parameters, Southern Panels Mining Area
Table 3 Maximum Subsidence Parameters,Apache Rocks West Mining Area
Table 4 Maximum Subsidence Parameters, Sunset Trail Mining Area
APPENDICES
Appendix A Potential for Surface Subsidence Due to Development Mining at West Elk Mine Under
Perennial Streams—Technical Memo December 2020
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