2022-09-29_PERMIT FILE - C1980007 ‎(5)‎

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 9/29/2022
• 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: No

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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 B13-A to B12 and E12 to E10 – Vertical Displacement
Figure 8 Panel E15 and E7 -- Vertical Displacement
Figure 9 Panels SS1 to SS4 – Vertical Displacement
Figure 10 Panels E14 through E6 – Vertical Displacement
Figure 11 Panels E17, E16, E4 and B28 and B29 -- Vertical Displacement
Figure 12 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