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July 23, 2013 <br />Page 42 <br />Design Depth <br />Mining Height (ft) <br />of Cover (ft) <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />60 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />80 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />100 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />120 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />140 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />160 <br />77 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />180 <br />80 <br />87 <br />96 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />200 <br />85 <br />91 <br />97 <br />106 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />220 <br />90 <br />97 <br />103 <br />110 <br />116 <br />125 <br />135 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />240 <br />95 <br />102 <br />109 <br />116 <br />123 <br />130 <br />136 <br />144 <br />154 <br />164 <br />173 <br />183 <br />192 <br />260 <br />100 <br />108 <br />115 <br />122 <br />130 <br />137 <br />144 <br />150 <br />157 <br />164 <br />173 <br />183 <br />192 <br />280 <br />105 <br />1131 <br />121 <br />129 <br />136 <br />144 <br />151 <br />158 <br />165 <br />172 <br />179 <br />186 <br />193 <br />300 <br />109 <br />1181 <br />126 <br />134 <br />1421 <br />150 <br />158 <br />166 <br />173 <br />181 <br />188 <br />195 <br />203 <br />Coal Strength (psi) 900 Mining Width (ft) 11.50 <br />*Pillar widths in italics have width -to- height ratios of 0.8 <br />240 <br />v <br />180 <br />C <br />x <br />0 <br />3 <br />a <br />J <br />J <br />a <br />8 120 <br />milli <br />20 <br />15 F <br />3 <br />a <br />J <br />J <br />a <br />ffl <br />10 D <br />5 <br />50 100 150 200 250 300 350 <br />DEPTH OF COVER (ft) <br />No. Web Pillars 19 <br />Mining <br />Height <br />(ft) <br />—�8 <br />9 <br />— �t - -10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />- +- 17 <br />-18 <br />19 <br />20 <br />Figure 30a. Web Pillar Design Chart —South Taylor Pit, E and D2 /E Seams <br />Agapito Associates, Inc. <br />I <br />20 <br />15 F <br />3 <br />a <br />J <br />J <br />a <br />ffl <br />10 D <br />5 <br />50 100 150 200 250 300 350 <br />DEPTH OF COVER (ft) <br />No. Web Pillars 19 <br />Mining <br />Height <br />(ft) <br />—�8 <br />9 <br />— �t - -10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />- +- 17 <br />-18 <br />19 <br />20 <br />Figure 30a. Web Pillar Design Chart —South Taylor Pit, E and D2 /E Seams <br />Agapito Associates, Inc. <br />