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2.6 <br />BTU <br />• The large range in BTU values (5,458) may be explained by the shale and bone lenses just <br />discussed. However, the mean (10,711) and standard deviation (955) suggest a fairly uniform <br />bituminous coal. The standard deviation suggests the following if a normal distribution is <br />assumed: <br />a. 8% of all samples have BTU values between 9,755 and 11,666; <br />b. 84% of all samples have BTU values greater than 9,755; <br />c. 16% of all samples have BTU values less than 9,755; <br />d. 16% of all samples have BTU values greater than 11,666; <br />e. 84% of all samples have BTU values less than 11,666. <br />A visual scan of the raw BTU data indicated that three of the thirty samples (10%) actually <br />have BTU values less than 9,755 and three of the samples (10%) actually have BTU values <br />greater than 11,666. Thus, although the distribution is not exactly normal, it approximates <br />normality, and skewness is not present. If this near normal distribution holds constant after the <br />• addition of future samples taken with more consistent sampling techniques, some predictive <br />CJ <br />value may be realized from this type of analysis regarding expected BTU values in unmined <br />portions of the McClane Graben. <br />ASH <br />Most of the comments just made regarding BTU also apply to the ash content of the thirty <br />samples. The large range (32.29) may be explained by very high and very low ash content in <br />individual drill samples. Specifically, the range on the twelve channel samples is 10.21, the <br />mean is 15.06 and the standard deviation is only 3.02, suggesting again that the channel <br />samples are much more uniform than the drill samples. <br />MC Volume 1 4.29.96 <br />