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' 2.04.6 (2) (a) <br />' (i) Nature, depth and thickness of coal seams. <br />. The C seam varies in thickness from less than 1 foot south <br />of the lease boundary to a maximum of approximately 8 feet <br />in thickness in Section 16. Based on limited exploration <br />data, it would appear that the C seam reserves which can <br />' be economically recovered from the lease area are confined <br />to the area north of a line, east-west, through the center <br />of Section 21. A C Seam Isopach Map is enclosed as flap <br />2.04.6 (2) (a) (i) -1. <br />' The quality of C seam coal, as mined, appears to be of high <br />' uniformity. A typical analysis of coal produced is as follows: <br /> ~ Mositure 6.12 <br /> $ Ash 6.55 <br /> BTU 12639 <br />' ~ Sulfur 0.57 <br />A C coal seam analysis differentiating by percentage the sulfur <br />compounds encountered is shown on Figure 2.04.6(2)(a)(i)-1. <br />This information was provided from the nearby [J.S. Steel <br />Somerset Mine. <br />The C seam roof consists of 5 to 12 feet of shale, overlain <br />by massive sandstone. The mine roof is subject to the <br />' occurrence of fractures, ancient channel features and kettles <br />as is normal with this region. <br />' In general, the roof material is reasonably competent but is <br />' subject of deterioration when exposed to the cycles of <br />moisture change attendant with mine ventilation and natural <br />' climatic conditions. For this reason, 6 to 12 feet of <br />top coal is left of prevent the shale exposure. <br />' The floor of the C seam is characterized by 5 to 12 feet of <br />competent shales underlain by a massive sandstone. The floor <br /> <br />REVISED May 15, 1981 <br />41 <br />