Laserfiche WebLink
2-5 <br />2.1.4 Nature and Extent of the Coal <br />2 .1.4.1 Nature of the Coal <br />In most of the McClane Canyon Graben mined to date the Cameo Seam is present as a <br />single seam with a minimum thickness of 20 feet from the McClane Canyon portal to the split <br />line 3300 feet to the northeast. Most of the area north and east of this point appears to <br />contain a split coal seam; although there are areas where as much as 29 feet of cumulative <br />coal exist (See Figures 2.5.3 and 2.5.4). <br />Throughout the Cameo Seam, lenses of bone coal and carbonaceous shale have been <br />observed. These lenses are quite irregular in thickness and aerial extent and therefore, <br />selective mining around them is not feasible. The effect of these lenses upon the aggregate <br />quality is apparent in channel and drill samples taken from the McClane Canyon entries and <br />• elsewhere on the lease block. An analysis of thirty such samples appears in Table 2.1.2. <br />Eighteen of the samples are drill samples from the top coal in the McClane Canyon entries. <br />Each sample represents two feet of drilling. A given sample could represent one tense of shale <br />or bone coal and have the same mathematical value as another more representative sample. <br />The remaining twelve samples are channel samples from the entries and may be more <br />representative of the aggregate. Admittedly, certain biases are introduced by these and other <br />discrepancies in the sampling, and no attempt is made here to present a rigorous statistical <br />analysis within the McClane Canyon mine area. The measures of dispersion and central <br />tendency used in Table 2.1.2 are to avoid presenting voluminous raw data. <br />• <br />M~ Volume 1 4.29-96 <br />