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eh <br />ESPEY, HUSTON 6 ASSOCIATES, INC. <br /> <br />spontaneous combustion of the coals and other highly carbonaceous strata resulting <br />in thermal alteration or metamorphism of overlying sedimentary units. Develop- <br />mental and exploration drilling indicates no actively burning areas are present or <br />anticipated within the mine plan area. <br />.See Insert Page F-tea <br />2.2.2 Geologic Structure <br />The azea of Northern Coal Company's coal mine plan azea is situated at <br />the northern end of the Grand Hogback monocline and along the southern limb of the <br />Danforth Hills highlands, a southeasterly trending anticlinal structure associated <br />with the White River Uplift to the east. The Danforth Hills anticline borders the <br />property on the north and is asymmetric with gentle dips to the north and much <br />steeper dips on the south flank where it is associated with the Sulfur Creek syncline <br />(see Surficial Geology, Exhibit F-3). <br />Structurally, Northern Coal Company's mine plan area is confined to the <br />Sulfur Creek syncline. It too, is asymmetric with a steep south dipping north limb of <br />24° to 45° and a north dipping south limb varying from 12° to 25°. The structure is <br />doubly plunging with the surface expression of the axis trending approximately N. <br />83° E., approximately 134 miles north of the Rienau No. 2 (G-Seam) Mine. <br />Dips of the stratum and of the G, J, P and UP seams range from 18° to <br />the north at the Rienau No. 2 (G-Seam) Mine to about 12° to the west of north along <br />Aicher's Draw near the eastern boundary of the proposed permit area. North of the <br />Rienau No. 2 (G-Seam) Mine, toward the axis of the syncline, dips tend to shallow, <br />becoming almost level, eventually reversing dip direction north of the synclinal axis. <br />Geologic cross-sections aze presented in Exhibits F-4 through F-6 and show both <br />structure and seam correlations of the principal coal seams across the property. <br />Minor faulting involving the FF seam at the Northern No. 1 (FF-Seam) <br />Mine is present in a subparallel pattern neaz the axis of the syncline in sections 20 <br />~- <br />F-5 <br />