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Mr. Lee Sampson <br /> April 23, 2021 <br /> Page 7 <br /> Design Mining Height, ft <br /> Depth of Cover, ft 6.0 7.25 8.5 9.75 11 12.25 13.5 14.75 16 17.25 18.5 19.75 21 <br /> 100 65.3 61.0 57.3 54.1 51.1 48.4 46.0 43.8 41.8 40.0 38.3 36.8 35.4 <br /> 140 64.4 60.2 56.6 53.3 50.4 47.9 45.6 43.4 41.5 39.8 38.2 36.7 35.3 <br /> 180 63.6 59.4 55.8 52.6 49.7 47.2 44.9 42.8 40.9 39.2 37.6 36.2 34.8 <br /> 220 61.2 58.7 55.0 51.9 49.1 46.5 44.3 42.2 40.4 38.7 37.1 35.7 34.3 <br /> 260 57.5 55.3 53.51 51.21 48.4 45.9 43.7 41.6 39.81 38.1 36.6 35.2 33.8 <br /> 300 54.4 51.9 50.3 48.4 46.8 45.2 43.0 41.0 39.2 37.6 36.11 34.7 33.4 <br /> 340 52.0 49.3 47.1 45.2 43.8 42.4R29.8 <br /> 39.8 38.7 37.1 35.6 34.2 32.9 <br /> 380 49.4 46.8 44.6 42.7 40.9 39.3 37.1 36.2 35.1 34.1 33.2 32.5 <br /> 420 47.1 44.6 42.3 40.4 38.5 37.0 34.2 33.1 32.2 31.4 30.6 29.9 <br /> 460 45.0 42.4 40.2 38.4 36.5 34.9 32.0 30.9 29.8 28.8 27.8 27.1 <br /> 500 43.2 40.5 38.2 36.3 34.6 33.0 30.2 29.0 27.9 26.9 25.9 25.1 <br /> 540 41.4 38.7 36.5 34.6 32.9 31.3 28.5 27.3 26.2 25.2 24.3 23.4 <br /> 580 39.8 37.1 34.9 33.0 31.3 29.8 27.0 25.81 24.7 23.7 22.8 22.0 <br /> Coal strength, psi 900 Mining width, ft 11.50 No. web pillars 19 <br /> 70 <br /> 65 <br /> Mining <br /> Height, <br /> 60 - ft <br /> 55 +6 <br /> 7.25 <br /> 50 8.5 <br /> y +9.75 <br /> W 11 <br /> O 45 <br /> yi 12.25 <br /> + 13.5 <br /> 40 4 - - - f 14.75 <br /> 16 <br /> 35 t 17.25 <br /> +_ -18.5 <br /> 30 rt 19.75 <br /> L <br /> i+ 21 <br /> 25 <br /> 20 <br /> 100 140 180 220 260 300 340 380 420 460 500 540 580 <br /> DEPTH OF COVER,ft <br /> Figure 2c. Raw Recovery-South Taylor G78 Seam <br /> Agapito Associates, Inc. <br />