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Mr. Lee Sampson <br /> April 23, 2021 <br /> Page 10 <br /> Design Mining Height, ft <br /> Depth of Cover, ft 3 3.5 4 I 4.5 5 5.5 6 6.5 7 7.5 8 I 8.5 I 9 <br /> 110 72.4 70.8 69.0 67.6 66.2 64.9 64.0 62.8 61.6 60.8 60.0 58.9 58.1 <br /> 130 69.9 68.3 66.6 65.3 63.7 62.5 61.3 60.2 59.1 58.0 57.0 56.1 55.4 <br /> 150 67.6 66.0 64.5 63.1 61.6 60.2 58.8 57.8 56.5 55.5 54.6 53.7 52.8 <br /> 170 65.4 63.8 62.2 60.9 59.6 58.1 56.7 55.5 54.4 53.4 52.4 51.4 50.5 <br /> 190 63.4 61.6 60.1 58.7 57.4 56.3 54.9 53.9 52.6 51.3 50.3 49.4 48.4 <br /> 210 61.5 59.7 58.1 56.6 55.3 54.2 53.0 51.9 51.0 49.9 48.8 47.8 46.7 <br /> 230 59.7 57.8 56.2 54.6 53.2 52.1 50.9 49.9 48.9 48.0 47.1 46.2 45.4 <br /> 250 58.2 56.2 54.5 52.9 51.4 50.2 49.0 47.9 46.9 46.0 45.1 44.3 43.5 <br /> 270 56.6 54.6 52.8 51.1 49.7 48.4 47.2 46.1 45.2 44.1 43.3 42.5 41.6 <br /> 290 55.1 53.0 51.3 49.7 48.2 46.8 45.6 44.5 43.4 42.4 41.6 40.7 39.9 <br /> 310 53.8 51.6 49.8 48.1 46.7 45.4 44.1 42.9 41.9 40.9 40.0 39.1 38.3 <br /> 330 52.6 50.3 48.4 46.8 45.3 43.9 42.6 41.5 40.4 39.4 38.5 37.7 36.8 <br /> 350 51.3 49.1 47.3 45.6 44.0 42.5 41.3 40.1 39.1 38.1 37.2 36.4 35.6 <br /> Coal strength, psi 495 Mining width, ft 11.50 No. web pillars 19 <br /> 75 <br /> 70 <br /> Mining <br /> Height, <br /> ft <br /> 65 <br /> i�4 t3 <br /> 3.5 <br /> 60 <br /> mac-4 <br /> t <br /> } � I -4.5 <br /> O55 4 5 <br /> t t 5.5 <br /> 50 6 <br /> -8--6.5 <br /> +,- 7 <br /> 45 <br /> L- +7.5 <br /> I � -8 <br /> 40 8.5 <br /> 9 <br /> 35 <br /> 30 <br /> 110 130 150 170 190 210 230 250 270 290 310 330 350 <br /> DEPTH OF COVER, ft <br /> Figure 3c. Raw Recovery-Collom B2/B3 Seam <br /> Agapito Associates, Inc. <br />