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Collom Area Geology Pre - Feasibility Report <br />In March 2005, Rio Tinto Technical Services (RTTS) performed a geological <br />database audit of the Collom drill hole data. In response to a <br />recommendation from the geological audit, RTTS performed a geostatistical <br />review of the Collom drill hole data with respect to the Colowyo mine data. <br />The RTTS geostatistical review stated that the drilling data through 2004 <br />satisfied RTTS requirements for Pre - Feasibility level development of the CMA. <br />The study further stated that a drill hole spacing of approximately 2,000 feet <br />is required for Feasibility level development of the CMA. <br />The estimated in -place measured and indicated controlled and uncontrolled <br />recoverable coal resource of the Collom Resource Area is 456.6 million tons. <br />The estimated in -place measured and indicated controlled and uncontrolled <br />coal resource within the CMA is 183.8 million tons <br />The estimated controlled coal resource of the CMA is 74.1 million tons. The <br />• estimated uncontrolled coal resource of the CMA is 109.6 million tons. <br />The estimated controlled and uncontrolled mineable proven and probable <br />reserve within the CMA is 157.1 million tons The estimated 'Product" <br />quality for the CMA is 16.22% Moisture, 6.44% Ash, 10,450Btu /ib, 0.47% <br />Total Sulfur, and Reducing Hemispherical Fusion Temperature (AFT) of <br />2,499. <br />The estimated controlled coal reserve within the CMA pit is 60.1 million <br />recoverable tons. The estimated uncontrolled reserve of the CMA pit is 97.0 <br />million tons. <br />The mercury content of CMA is less than 0.05 g /mg, which makes the Collom <br />coal among the lowest in the USA. <br />August 2005 Page ii <br />ryf <br />