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2022-01-27_PERMIT FILE - C1981019 (7)
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2022-01-27_PERMIT FILE - C1981019 (7)
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Last modified
5/18/2022 10:03:03 AM
Creation date
5/18/2022 10:01:45 AM
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Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Permit File
Doc Date
1/27/2022
Doc Name
Addendum Collom and South Taylor Highwall Mining Geotechnical Design
Section_Exhibit Name
Volume 20 Exhibit 27 Item 7
Media Type
D
Archive
No
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Mr. Lee Sampson <br />December 7, 2021 <br />Page 5 <br /> <br />Agapito Associates, Inc. <br /> <br />Design <br />Depth of Cover, ft 4 5 6 7 8 9 10 12 14 16 18 20 22 <br />100 48 60 72 84 96 108 120 144 168 192 216 240 264 <br />140 48 60 72 84 96 108 120 144 168 192 216 240 264 <br />180 56 62 72 84 96 108 120 144 168 192 216 240 264 <br />220 67 72 78 84 96 108 120 144 168 192 216 240 264 <br />260 77 86 92 97 103 109 120 144 168 192 216 240 264 <br />300 85 95 105 113 120 125 132 144 168 192 216 240 264 <br />340 94 105 115 126 135 145 152 164 178 192 216 240 264 <br />380 103 115 127 138 149 160 170 190 204 216 231 245 264 <br />420 111 126 139 151 163 174 186 209 232 252 267 280 293 <br />460 120 136 151 165 178 190 203 229 254 279 303 326 343 <br />500 128 146 162 178 192 207 220 248 277 305 333 360 387 <br />540 137 156 174 191 207 223 238 268 300 332 363 394 425 <br />580 145 166 185 204 222 239 256 288 323 358 393 428 462 <br />Coal strength, psi 900 Mining width, ft 11.50 No. web pillars 19 <br />Pillar widths in italics have width-to-height ratios of 1.0 <br />Mining Height, ft <br />36 <br />60 <br />84 <br />108 <br />132 <br />156 <br />180 <br />204 <br />228 <br />252 <br />276 <br />300 <br />324 <br />348 <br />372 <br />396 <br />420 <br />444 <br />468 <br />100 140 180 220 260 300 340 380 420 460 500 540 580REQUIRED WEB PILLAR WIDTH, in DEPTH OF COVER, ft <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />12 <br />14 <br />16 <br />18 <br />20 <br />22 <br />Mining <br />Height, <br />ft <br />Figure 2a. Web Pillar Design Chart—South Taylor G78 Seam
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