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Collom Area Geology Pre - Feasibility Report <br />• <br />Figure 6.3 <br />Moisture Distribution of 2004 Drilling by Moisture Type <br />C] <br />• <br />0.35 <br />0.30 <br />0.25 <br />0.20 <br />0.15 <br />0.10 <br />0.05 <br />0.00 <br />5.00 <br />25.00 <br />Given these data, CMA moisture estimates should be based upon equilibrium <br />moisture values. To determine the predicted product moisture for the CMA, <br />additional work needs to be performed to determine the relationship of <br />equilibrium moisture values to product moisture values. This work should <br />compare Colowyo West Pit drill hole equilibrium moisture values to West Pit <br />production moisture values. <br />6.3 Review Apparent Specific Gravity <br />Colowyo, along with most coal mines in the US, uses apparent specific <br />gravity (ASG) as the density factor for tonnage calculations. RTTS <br />highlighted a concern with the density values being determined for the <br />Collom project area. Specifically, the correlation between ash and ASG of <br />the 2004 coal quality data was not as "tight" as would be expected. The data <br />shows a constant ASG value (1.31) was determined over large range of ash <br />values (39/o to 12 %). In response to RTTS' concerns, the Collom Exploration <br />August 2005 Page 23 of 38 <br />10.00 15.00 20.00 <br />Moisture <br />Total Moisture —EQ Moisture Colowyo Product Moisture <br />