2023-07-14_PERMIT FILE - C1981010 ‎(16)‎

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 7/14/2023
• Doc Name: Summary of Geotechnical Design andf Operational Cnsiderations for Highwall Mining-I,J,N, and L Pits
• Section_Exhibit Name: Appendix X
• Media Type: D
• Archive: No

January 2, 2020 Page ii
Agapito Associates, Inc.
LIST OF TABLES
Page
Table 1-1. Summary of HWM Pits and Seams Mined ....................................................... 1-1
Table 2-1. Physical Property Summary of Major Rock Types ........................................... 2-1
Table 2-2. Slake Durability Classification ......................................................................... 2-2
Table 2-3. Physical Characteristics of the Target Seams .................................................... 2-2
Table 3-1. Typical ADDCAR System Parameters ............................................................. 3-1
Table 3-2. Roof Stability Summary ................................................................................... 3-2
Table 4-1. Normalized Coal Strengths Used in Web and Barrier Pillar Design ................. 4-2
Table 4-2. ARMPS-HWM SF Criteria .............................................................................. 4-3
Table 5-1. Estimated HWM Recoveries ............................................................................ 5-1

LIST OF FIGURES

Figure 1-1. Location of Proposed Box Cuts and HWM Areas ............................................. 1-2