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eh <br />ESPEY, HUSTON & ASSOCIATES, INC. <br /> <br />aze assigned identifications using doubled letters such as AA through LL. Figure <br />F-1 is a stratigraphic column of the Williams Fork Formation within the mine plan <br />azea showing the seam stratigraphy as used by Northern Coal Company. Two seams <br />are currently being mined, the G seam at the Rienau No. 2 (G-Seam) Mine and the <br />FF seam at the Northern No. 1 (FF-Seam) Mine. <br />Deep drilling by Northern Coal Company into the Iles Formation has <br />shown the presence of six thin and laterally discontinuous and vaziable coal beds <br />approximately 170 feet below the Trout Creek Sandstone. These beds occur within a <br />100-foot thick interval and (for academic purposes only) are numbered 1 through 6 in <br />descending stratigraphic order. Mining by Northern Coal Company as presented in <br />this application will take place approximately 800 feet above these coals. <br />2.2.4 Coal Seam Geology <br />• 2.2.4.1 G Seam <br />Stratigraphically, the lowest coal bed planned for mining is the G seam. <br />It occurs approximately 550 feet above the base of the Williams Fork Formation or <br />top of the Trout Creek Sandstone (Iles Formation). The bed ranges in thickness from <br />a maximum of 22 feet at the Rienau No. 2 (G-Seam) Mine to about 6 feet neaz the <br />northeast corner of federal lease C-28358. Neaz the midway point in the seam <br />height, the coal bed is characterized by a pazting of extreme vaziable lithology and <br />thickness. The pazting is present in the seam across the entire property, but <br />nowhere does it exceed 1.1 feet and is usually less than one-half foot in thickness. <br />Correlation of drilling results indicates the G-seam bed thins and splits into several <br />minor coal beds less than 2 feet thick in the southern half of federal PRLA <br />C-0126999. Along its outcrop across the entire property, the seam is extensively <br />burned and has been removed by erosion over all except the extreme northern border <br />of lease C-28359. <br />• <br />F-7 <br />