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July 23, 2013 <br />Page 39 <br />Design <br />Depth of Cover, ft <br />Mining Height, <br />ft <br />7 <br />9 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />1 18 <br />19 <br />20 <br />21 <br />100 <br />68 <br />87 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />202 <br />140 <br />72 <br />87 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />202 <br />180 <br />84 <br />98 <br />111 <br />117 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />202 <br />220 <br />95 <br />111 <br />126 <br />134 <br />141 <br />148 <br />155 <br />162 <br />169 <br />176 <br />183 <br />192 <br />202 <br />260 <br />105 <br />1231 <br />141 <br />1491 <br />1581 <br />166 <br />174 <br />182 <br />190 <br />198 <br />2051 <br />213 <br />221 <br />300 <br />115 <br />136 <br />155 <br />165 <br />174 <br />183 <br />192 <br />201 <br />2101 <br />219 <br />227 <br />236 <br />245 <br />340 <br />128 <br />147 <br />169 <br />180 <br />190 <br />200 <br />210 <br />220 <br />230 <br />240 <br />249 <br />259 <br />268 <br />380 <br />142 <br />163 <br />183 <br />194 <br />205 <br />216 <br />227 <br />238 <br />249 <br />260 <br />271 <br />281 <br />292 <br />420 <br />156 <br />179 <br />201 <br />212 <br />222 <br />233 <br />245 <br />257 <br />268 <br />280 <br />292 <br />303 <br />315 <br />460 <br />169 <br />196 <br />221 <br />233 <br />245 <br />2561 <br />2671 <br />278 <br />289 <br />300 <br />313 <br />325 <br />338 <br />500 <br />183 <br />2131 <br />2411 <br />2541 <br />268 <br />280 <br />293 <br />306 <br />318 <br />330 <br />3421 <br />354 <br />365 <br />540 <br />196 <br />230 <br />2611 <br />2761 <br />291 <br />305 <br />319 <br />3331 <br />3471 <br />361 <br />3741 <br />388 <br />401 <br />580 <br />210 <br />2461 <br />2811 <br />2971 <br />314 <br />330 <br />345 <br />3611 <br />3771 <br />392 <br />407 <br />422 <br />437 <br />Coal strength, psi 12t <br />480 <br />420 <br />360 <br />c <br />S <br />300 <br />J <br />J <br />d 240 <br />m <br />w <br />D 180 <br />d <br />w <br />120 <br />60 <br />0 <br />Mining width, n ii-Su No. web pillars IV <br />Pillar widths in italics have width -to- height ratios of 0.8 <br />amp <br />40 <br />35 Mining <br />Height, <br />ft <br />30 _� 7 <br />x 9 <br />S <br />25 11 <br />W 12 <br />¢ <br />J <br />J 13 <br />20 a <br />m <br />14 <br />LU 15 <br />15 <br />C7 16 <br />w <br />17 <br />10 -�- 18 <br />-19 <br />5 20 <br />21 <br />0 <br />50 150 250 350 450 550 <br />DEPTH OF COVER, ft <br />Figure 29a. Web Pillar Design Chart —South Taylor Pit, G7 and G78 Seams <br />Agapito Associates, Inc. <br />