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2023-07-14_PERMIT FILE - C1981010 (16)
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2023-07-14_PERMIT FILE - C1981010 (16)
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Last modified
8/4/2023 11:27:47 AM
Creation date
8/3/2023 1:15:05 PM
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DRMS Permit Index
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
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January 2, 2020 Page A-3 <br />Agapito Associates, Inc. <br /> <br />Figure A-1b. I Pit, F Seam Barrier Pillar Design Chart <br />Design <br />Depth of Cover (ft) 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6 6.3 6.6 <br />50 4.0 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.74.95.15.3 <br />65 5.9 6.2 6.4 6.4 6.3 6.2 6.3 6.5 6.6 6.8 6.9 7.0 7.2 <br />80 7.5 7.9 8.2 8.5 8.8 9.1 9.3 9.2 9.2 9.1 9.1 9.3 9.5 <br />95 9.1 9.5 9.9 10.3 10.7 11.1 11.4 11.7 12.1 12.4 12.7 12.7 12.7 <br />110 10.7 11.2 11.7 12.2 12.6 13.0 13.5 13.9 14.3 14.7 15.0 15.4 15.7 <br />125 12.2 12.8 13.4 13.9 14.5 15.0 15.5 16.0 16.5 16.9 17.4 17.8 18.2 <br />140 12.9 14.0 15.1 15.7 16.3 16.9 17.5 18.1 18.6 19.1 19.7 20.2 20.7 <br />155 13.3 14.3 15.5 16.6 17.8 18.8 19.5 20.1 20.7 21.3 21.9 22.5 23.1 <br />170 14.6 15.4 16.1 16.9 18.1 19.3 20.4 21.5 22.7 23.5 24.2 24.8 25.4 <br />185 16.0 16.8 17.6 18.3 19.1 19.8 20.8 21.9 23.1 24.3 25.4 26.5 27.6 <br />200 17.3 18.2 19.1 19.9 20.7 21.5 22.2 23.0 23.7 24.7 25.9 27.0 28.2 <br />215 18.6 19.6 20.5 21.4 22.3 23.1 24.0 24.8 25.6 26.3 27.1 27.8 28.7 <br />230 19.9 21.0 22.0 23.0 23.9 24.8 25.7 26.6 27.4 28.3 29.1 29.9 30.7 <br />Coal Strength (psi)540 Mining Width (ft)11.50 No. Web Pillars 19 <br />Pillar widths in italics have width-to-height ratios of 0.8 <br />Mining Height (ft) <br />0 <br />5 <br />10 <br />15 <br />20 <br />25 <br />30 <br />35 <br />50 70 90 110 130 150 170 190 210 230REQUIRED BARRIER PILLAR WIDTH (ft) DEPTH OF COVER (ft) <br />3.0 <br />3.3 <br />3.6 <br />3.9 <br />4.2 <br />4.5 <br />4.8 <br />5.1 <br />5.4 <br />5.7 <br />6.0 <br />6.3 <br />6.6 <br />Mining <br />Height <br />(ft) <br />534-40 Trapper [534-40 Trapper_Design Charts18JUL2018.pptx]:dc/smvf (7-18-2018)
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