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2021-05-27_PERMIT FILE - C1981019A (7)
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2021-05-27_PERMIT FILE - C1981019A (7)
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Last modified
5/18/2022 8:31:44 PM
Creation date
10/20/2021 6:44:11 AM
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
5/27/2021
Doc Name
Addendum Collom and South Taylor Highwall Mining Geotechnical Design
Section_Exhibit Name
Volume 20 Exhibit 27 Item 7
Media Type
D
Archive
Yes
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Mr. Lee Sampson <br /> April 23, 2021 <br /> Page 9 <br /> Design Mining Height, ft <br /> Depth of Cover, ft 3 1 3.5 4 4.5 I 5 5.5 I 6 6.5 7 I 7.5 8 I 8.5 9 <br /> 110 10.01 10.8 11.5 12.21 12.8 13.41 13.9 14.4 14.91 15.4 15.91 16.4 16.8 <br /> 130 12.01 13.1 14.0 14.81 15.6 16.31 17.1 17.7 18.4 19.0 19.6 20.2 20.7 <br /> 150 12.01 14.0 16.0 17.51 18.5 19.31 20.2 21.0 21.8 22.6 23.3 24.0 24.7 <br /> 170 13.81 14.9 16.0 18.01 20.0 22.01 23.4 24.3 25.3 26.2 27.1 27.9 28.7 <br /> 190 15.61 16.8 18.0 19.11 20.1 22.01 24.0 26.0 28.0 29.8 30.8 31.8 32.8 <br /> 210 17.4 18.8 20.1 21.4 22.5 23.6 24.7 26.0 28.0 30.0 32.0 34.0 36.0 <br /> 230 19.3 20.8 22.3 23.6 24.9 26.2 27.4 28.5 29.6 30.7 32.0 34.0 36.0 <br /> 250 21.1 22.8 24.4 25.9 27.4 28.7 30.1 31.3 32.5 33.7 34.9 36.0 37.0 <br /> 270 22.9 24.8 26.6 28.2 29.8 31.3 32.7 34.1 35.5 36.8 38.0 39.3 40.4 <br /> 290 24.7 26.8 28.7 30.5 32.2 33.9 35.4 37.0 38.4 39.8 41.2 42.6 43.9 <br /> 310 26.6 28.8 30.9 32.8 34.7 36.4 38.1 39.8 41.4 42.9 44.4 45.9 47.3 <br /> 330 28.4 30.8 33.0 35.1 37.1 39.0 40.81 42.6 44.3 46.0 47.6 49.2 50.7 <br /> 350 30.2 32.8 35.1 37.4 39.5 41.6 43.51 45.41 47.3 49.0 50.8 52.5 54.1 <br /> Coal strength, psi 495 Mining width, ft 11.50 No. web pillars 19 <br /> Pillar widths in italics have width-to-height ratios of 0.8 <br /> 60 <br /> Mining <br /> 50 Height, <br /> ft <br /> I+ t3 <br /> 0 40 <br /> 4 <br /> t 4.5 <br /> a I - 5 <br /> a30 r 5.5 <br /> m rii 6 <br /> 6.5 <br /> 7 <br /> 20 - <br /> 7.5 <br /> + 8 <br /> 8.5 <br /> 10 9 <br /> 0 <br /> 110 130 150 170 190 210 230 250 270 290 310 330 350 <br /> DEPTH OF COVER, ft <br /> Figure 3b. Barrier Pillar Design Chart-Collom B2/B3 Seam <br /> Agapito Associates, Inc. <br />
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