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Mr. Lee Sampson <br />December 7, 2021 <br />Page 7 <br /> <br />Agapito Associates, Inc. <br /> <br />Design <br />Depth of Cover, ft 45678910121416182022 <br />100 73.4 69.1 65.3 61.8 58.8 56.0 53.5 48.9 45.1 41.8 39.0 36.5 34.3 <br />140 72.6 68.2 64.4 61.0 58.0 55.2 52.7 48.4 44.7 41.5 38.8 36.4 34.3 <br />180 69.0 66.8 63.6 60.2 57.2 54.5 52.0 47.7 44.1 40.9 38.3 35.9 33.8 <br />220 65.3 63.2 61.2 59.4 56.4 53.7 51.3 47.0 43.4 40.4 37.7 35.4 33.3 <br />260 62.0 59.4 57.5 55.9 54.2 52.8 50.6 46.4 42.8 39.8 37.2 34.9 32.9 <br />300 59.5 56.8 54.4 52.5 50.8 49.6 48.0 45.7 42.2 39.2 36.6 34.4 32.4 <br />340 57.0 54.2 52.0 49.7 48.0 46.2 45.0 42.8 40.5 38.7 36.1 33.9 32.0 <br />380 54.6 51.9 49.4 47.4 45.5 43.7 42.2 39.6 37.7 36.2 34.4 33.1 31.5 <br />420 52.6 49.5 47.1 45.0 43.2 41.6 40.0 37.3 34.9 33.1 31.6 30.5 29.4 <br />460 50.6 47.5 45.0 42.8 41.0 39.4 37.9 35.2 32.9 30.9 29.2 27.7 26.6 <br />500 48.9 45.7 43.2 40.9 39.1 37.4 36.0 33.3 31.0 29.0 27.3 25.8 24.4 <br />540 47.1 44.0 41.4 39.2 37.3 35.6 34.2 31.6 29.3 27.3 25.6 24.1 22.8 <br />580 45.7 42.4 39.8 37.6 35.7 34.0 32.5 30.1 27.8 25.8 24.1 22.6 21.3 <br />Coal strength, psi 900 Mining width, ft 11.50 No. web pillars 19 <br />Mining Height, ft <br />20 <br />30 <br />40 <br />50 <br />60 <br />70 <br />100 140 180 220 260 300 340 380 420 460 500 540 580RAW RECOVERY, % DEPTH OF COVER, ft <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />12 <br />14 <br />16 <br />18 <br />20 <br />22 <br />Mining <br />Height, <br />ft <br />Figure 2c. Raw Recovery—South Taylor G78 Seam