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March 21, 2014 <br />Page 40 <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 />18 <br />19 <br />20 <br />21 <br />100 <br />8.3 <br />9.5 <br />10.6 <br />11.1 <br />11.6 <br />12.1 <br />12.6 <br />13.1 <br />13.7 <br />14.4 <br />15.2 <br />16.0 <br />16.8 <br />140 <br />12.1 <br />13.5 <br />14.8 <br />15.5 <br />16.3 <br />17.0 <br />17.6 <br />18.3 <br />18.9 <br />19.6 <br />20.2 <br />20.8 <br />21.4 <br />180 <br />16.6 <br />18.6 <br />20.3 <br />21.1 <br />21.9 <br />22.6 <br />23.3 <br />23.9 <br />24.6 <br />25.2 <br />25.9 <br />26.7 <br />27.5 <br />220 <br />21.2 <br />23.8 <br />26.2 <br />27.2 <br />28.3 <br />29.3 <br />30.2 <br />31.1 <br />32.0 <br />32.8 <br />33.7 <br />34.5 <br />35.2 <br />260 <br />25.7 <br />29.11 <br />32.0 <br />33.41 <br />34.7 <br />36.01 <br />37.2 <br />38.41 <br />39.51 <br />40.6 <br />41.71 <br />42.7 <br />43.7 <br />300 <br />30.3 <br />34.3 <br />37.9 <br />39.6 <br />41.2 <br />42.8 <br />44.3 <br />45.7 <br />47.1 <br />48.4 <br />49.8 <br />51.0 <br />52.3 <br />340 <br />34.9 <br />39.6 <br />43.9 <br />45.8 <br />47.7 <br />49.6 <br />51.3 <br />53.1 <br />54.7 <br />56.3 <br />57.9 <br />59.4 <br />60.9 <br />380 <br />39.5 <br />44.9 <br />49.8 <br />52.1 <br />54.3 <br />56.4 <br />58.4 <br />60.4 <br />62.4 <br />64.2 <br />66.1 <br />67.9 <br />69.6 <br />420 <br />44.1 <br />50.2 <br />55.7 <br />58.3 <br />60.8 <br />63.2 <br />65.6 <br />67.8 <br />70.0 <br />72.2 <br />74.3 <br />76.3 <br />78.3 <br />460 <br />48.7 <br />55.5 <br />61.7 <br />64.6 <br />67.41 <br />70.1 <br />72.71 <br />75.2 <br />77.7 <br />80.1 <br />82.5 <br />84.8 <br />87.0 <br />500 <br />53.3 <br />60.91 <br />67.7 <br />70.9 <br />73.9 <br />76.91 <br />79.8 <br />82.71 <br />85.41 <br />88.11 <br />90.71 <br />93.2 <br />95.7 <br />540 <br />57.9 <br />66.1 <br />73.6 <br />77.1 <br />80.5 <br />83.81 <br />87.01 <br />90.11 <br />93.11 <br />96.01 <br />98.91 <br />101.7 <br />104.5 <br />580 <br />62.5 <br />71.51 <br />79.6 <br />83.4 <br />87.1 <br />90.71 <br />94.11 <br />97.51 <br />100.81 <br />104.01 <br />107.11 <br />110.2 <br />113.2 <br />Coal strength, psi 727 Mining width, ft 11.5U No. web pillars 19 <br />Pillar widths in italics ha\e width -to- height ratios of 0.8 <br />120 <br />100 <br />2 <br />80 <br />J <br />J <br />CL <br />M 60 <br />Q <br />m <br />0 <br />w <br />m <br />40 <br />a <br />w <br />m <br />20 <br />0 <br />50 <br />150 250 350 <br />DEPTH OF COVER, ft <br />450 550 <br />Mining <br />Height, <br />ft <br />- �- 7 <br />9 <br />- 12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />�- 18 <br />19 <br />20 <br />21 <br />Figure 29b. Barrier Pillar Design Chart -South Taylor Pit, G7 and G8 Seams <br />Agapito Associates, Inc. <br />I <br />- <br />L <br />I <br />I <br />1 <br />150 250 350 <br />DEPTH OF COVER, ft <br />450 550 <br />Mining <br />Height, <br />ft <br />- �- 7 <br />9 <br />- 12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />�- 18 <br />19 <br />20 <br />21 <br />Figure 29b. Barrier Pillar Design Chart -South Taylor Pit, G7 and G8 Seams <br />Agapito Associates, Inc. <br />