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<br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br />Mine logical mining unit. Plate 10 is the isopach map of the mineable B Seam and shows the location <br />of major partings. <br />3.3.2 RSeem The D Seam has been a target of interest in the Rangely coal field area since the late <br />nineteenth century and was mined at the now abandoned Staley-Gordon Mine until about 1970. <br />Thickness of the D Seam vazies from 0 (areas of non-deposition) in the western portion of the Deserado <br />Mine area to about 9 feet in the central and eastem most portions of the area. Mine development at the <br />Deserado Mine has to date been limited to the D Seam. Where presently being mined by Western <br />Fuels, the D Seam is of consistent quality and thickness. Exploration by Western Fuels has delineated <br />a major parting in the D Seam. This parting is splay like in nature and appears to enter the Deserado <br />Mine LMU from the Northeast. The parting occurs at the middle of the D Seam and splits the D Seam <br />into two or more seams neither of which are of mineable thickness. The parting is located along the <br />eastem side of lease C-A4b93 (see cross sections G-G; Plate 6), across the noRhem third of new lease <br />COC-51551, and bisecting lease C-0?3703 just west of the D Seam portal. This parting vazies from <br />inches thick at the feather edge to over twenty feet thick and effectivley prevents mining in the D Seam <br />to the east and north of the Deserado Mine LMU. Exploration in and adjacent to new lease COC- <br />51551 shows that the overlying E Seam converges with the D Seam in lease COC-51551 and is <br />collectively referred to as the D Seam. Plate 12 is the Isopach Map of D Seam showing the location <br />of the middle D Seam parting and the D to E convergence line. North of the D to E convergence line <br />and south of the middle D Seam parting, the D Seam is 11 to 12 feet thick. North of the middle D <br />Seam parting the upper split of D Seam and the E Seam (also collectivley referred to as D Seam) <br />present a mineable thickness of 6 to 7 feet in the northern portion of new lease COC-51551. <br />33.3 The E Seam Exploration drilling in 1989 and 1991 has verified the convergence of E Seam and <br />D Seam in new ]ease COC-51551. E Seam is actually an upper split of D Seam, but will continue to <br />be referred to as the E Seam where not converged with the D Seam. Interburden between the E Seam <br />and underlying D Seam thickens to the south and west from 0 at the convergence line to over 40 feet <br />thick along the southern part of the Deserado Mine LMU. The economic significance of the E Seam <br />is severely limited by its extreme variability of thickness and extent. The E Seam exceeds 3.5 feet of <br />thickness in an area of about 200 acres centered in the NW1/4 Section 2, T2N R101W, achieving a <br />maximum of about 6 feet. <br />33.4 F and G Geamc The F and G Seams occur in an extremely variable stratigraphic interval <br />positioned from 5 to 30 feet above the E Seam. Both seams approach 5 feet in thickness in isolated <br />azeas. However, neither are of minable thickness over sufficient area to be of any economic interest. <br />13 <br /> <br />