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Addendum to the Collom Area Geology Pre - Feasibility Report <br />• Table 5.5 <br />Leased In -Situ Coal Resource Estimate <br />for the Collom Phase 1 & 2 Pit Shell <br />Resource Area Measured Indicated Resource Base Inferred <br />Phase 1 & 2 Pit Shell 63,893 5,204 69,096 0 <br />Note: All values in thousands <br />Resource Coal <br />69,096 <br />Table 5.6 <br />Estimated Coal Quality of the Collom Phase 1 & 2 Pit Shell* <br />Moisture Ash Btu /Lb Sulfur ASG Ash Fusion Mercury Sodium <br />15.13 5.38 10,721 0.46 1.32 2,499 0.04 0.44 <br />*As- Received Moisture Basis <br />5.5 Estimated Collom Inventory Coal Tonnage <br />HGC determined several types of inventory tonnage within the Collom Mine <br />Area to provide benchmarks with respect to tonnage estimates. HGC <br />• compiled inventory tonnage estimates for: the Collom LBA through the GB <br />seam, the Collom LBA for all seams, the Phase 4/I -Pod area, and within the <br />full extent of the Collom Model Area, see Table 5.7. Table 5.8 presents the <br />As- Received basis quality for each inventory area. <br />Table 5.7 <br />Estimated In -Situ Inventory Coal for the Collom Mine Area <br />Inventory Area Measured Indicated Inferred Total Inventory Coal <br />Un- leased Phase 1 & 2 Polygon 85,529 37,115 743 123,388 <br />Collom LBA through GB Seam 89,704 45,295 2,104 137,103 <br />Collom LBA All Modeled Seams 159,143 111,490 17,150 287,783 <br />Phase 4/I -Pod Area <br />Collom Model Area <br />98,460 133,145 15,084 246,689 <br />561,591 628,425 391,712 1,581,728 <br />If Colowyo acquires the Collom LBA, then the 137.1 million tons through the <br />GB seam could be classified as coal resources. Until then, these tonnage <br />estimates must be classified as "inventory ". <br />September 2006 Page 18 of 25 <br />