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Coal Quality Data Review for Colowyo Coal Company <br />• <br />r� <br />U <br />Company <br />Equation <br />Sloe <br />Y <br />Intercept <br />Btu /Ib @ 5.4 <br />Default Ash <br />Difference <br />from KEC <br />KEC <br />y = - 150.08x + 13627 <br />- 150.08 <br />13627 <br />12,817 <br />n/a <br />Utah <br />y = - 144.31x + 13494 <br />- 144.31 <br />13494 <br />12,715 <br />102 <br />Grace <br />y = - 140.54x + 13381 <br />- 140.54 <br />13381 <br />12,622 <br />194 <br />Mine Area <br />y = - 163.34x + 13579 <br />- 163.34 <br />13579 <br />12,697 <br />120 <br />Mine Area DH <br />y = - 149.96x + 13671 <br />- 149.96 <br />13671 <br />12,861 <br />45 <br />Table 1 <br />Comparison of Dry Basis Ash and Btu/11b Regression Analysis <br />Table 2 <br />Comparison of As- Received Basis Ash and Btu/11b Regression Analysis <br />Company <br />Equation <br />Slope <br />Y <br />Intercept <br />Btu /Ib @ 4.5 <br />Default Ash <br />Difference <br />from KEC <br />KEC <br />y = - 129.18x + 11320 <br />- 129.18 <br />11320 <br />10,739 <br />n/a <br />Utah* <br />y = - 121.12x + 11328 <br />- 121.12 <br />11328 <br />10,783 <br />(44) <br />Grace <br />y = - 109.28x + 10887 <br />- 109.28 <br />10887 <br />10,395 <br />343 <br />Mine Area <br />y = - 167.74x + 11449 <br />- 167.74 <br />11449 <br />10,694 <br />45 <br />Mine Area DH <br />y = - 132.77x + 11494 <br />- 132.77 <br />11494 <br />10,897 <br />158 <br />* Moisture values are potential Air -Dried Basis <br />The regression analysis of the ash and Btu /Ib data, provide the means to <br />determine potential factors to normalize the data. At this time, HGC does <br />not recommend adjusting the Utah data. HGC recommends that HGC and <br />Colowyo personnel discuss the validity of applying factors to the Grace data. <br />Some of the 2004 drill holes are situated closely to existing Utah and Grace <br />drill holes. HGC recommends comparing the results of the 2004 drilling to <br />the results of existing drill holes. HGC expects to see significant <br />improvements in the coal quality relative to the Utah or Grace drill holes in <br />the same area. HGC believes that a determination will need to be made on a <br />July 2004 <br />Page 9 of 16 <br />