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06- Aug -06 Rio Tinto Energy America - Colowyo Mine Page 4 of 5 <br />Drill Hole Lithology Summary <br />Drill Hole <br />Eas ting <br />Northing C ollar Total Depth <br />Township Range <br />Section File <br />• <br />CHM -05 -11 <br />1,334,187.73 <br />358,970.09 6,908.87 1,183.00 <br />T03N R93W <br />25 <br />5C <br />Adjusted <br />Depths <br />From <br />To <br />Seam <br />Thickness Lithologic Qualifiers <br />Lithology Type <br />Shade <br />Color <br />848.60 <br />852.40 <br />3.80 <br />mudstone <br />medium- <br />grey <br />852.40 <br />861.40 <br />15 <br />9.00 moderately brig <br />coal <br />861.40 <br />862.50 <br />1.10 <br />mudstone <br />medium- <br />grey <br />862.50 <br />870.00 <br />17 <br />7.50 moderately brig <br />coal <br />870.00 <br />871.90 <br />1.90 <br />mudstone <br />medium- <br />grey <br />871.90 <br />872.40 <br />J2 <br />0.50 moderately brig <br />coal <br />872.40 <br />882.00 <br />9.60 <br />mudstone <br />medium- <br />grey <br />882.00 <br />883.00 <br />1.00 <br />carbonaceous mudston <br />very dark <br />brown <br />883.00 <br />886.30 <br />3.30 <br />mudstone <br />medium- <br />grey <br />886.30 <br />892.00 <br />J4 <br />5.70 moderately brig <br />coal <br />892.00 <br />894.50 <br />J6 <br />2.50 moderately brig <br />coal <br />894.50 <br />898.00 <br />J8 <br />3.50 moderately brig <br />coal <br />898.00 <br />915.00 <br />17.00 brittle <br />mudstone /siltstone <br />medium- <br />grey <br />915.00 <br />919.00 <br />4.00 <br />sandstone <br />medium <br />grey <br />919.00 <br />923.10 <br />4.10 <br />siltstone /sandstone <br />medium <br />grey <br />923.10 <br />925.10 <br />K3 <br />2.00 moderately brig <br />coal <br />925.10 <br />927.00 <br />1.90 <br />mudstone <br />medium- <br />grey <br />927.00 <br />931.50 <br />4.50 <br />siltstone <br />medium <br />grey <br />931.50 <br />931.80 <br />ZZ <br />0.30 moderately brig <br />coal <br />931.80 <br />934.30 <br />2.50 <br />mudstone <br />medium- <br />grey <br />934.30 <br />938.00 <br />K5 <br />3.70 moderately brig <br />coal <br />938.00 <br />940.50 <br />KM <br />2.50 KM marker <br />tuff/tonstien <br />940.50 <br />943.70 <br />K7 <br />3.20 moderately brig <br />coal <br />943.70 <br />948.30 <br />4.60 <br />mudstone <br />med gre <br />dark bro <br />• <br />948.30 <br />949.60 <br />K9 <br />1.50 moderately brig <br />coal <br />949.80 <br />954.50 <br />4.70 <br />mudstone <br />very dark <br />brown <br />954.50 <br />969.00 <br />14.50 brittle <br />mudstone /siltstone <br />medium <br />grey <br />969.00 <br />985.00 <br />16.00 interbedded <br />siltstone /sandstone <br />medium <br />grey <br />985.00 <br />996.50 <br />11.50 silty <br />sandstone /siltstone <br />medium <br />grey <br />996.50 <br />997.80 <br />1.30 <br />mudstone <br />997.80 <br />1003.60 <br />L3 <br />5.80 moderately brig <br />coal <br />1003.60 <br />1009.90 <br />L5 <br />6.30 moderately brig <br />coal <br />1009.90 <br />1012.70 <br />L7 <br />2.80 moderately brig <br />coal <br />1012.70 <br />1014.00 <br />1.30 clayey <br />mudstone <br />very dark <br />brown <br />1014.00 <br />1019.00 <br />5.00 <br />siltstone <br />medium <br />grey <br />1019.00 <br />1020.80 <br />1.80 <br />mudstone <br />medium- <br />grey <br />1020.80 <br />1021.30 <br />ZZ <br />0.50 moderately brig <br />coal <br />1021.30 <br />1023.80 <br />2.50 brittle <br />mudstone <br />medium- <br />grey <br />1023.80 <br />1032.30 <br />M3 <br />8.50 moderately brig <br />coal <br />1032.30 <br />1032.50 <br />0.20 carbonaceous <br />mudstone <br />very dark <br />brown <br />1032.50 <br />1034.50 <br />M5 <br />2.00 moderately brig <br />coal <br />1034.50 <br />1034.90 <br />0.40 <br />mudstone <br />very dark <br />brown <br />1034.90 <br />1038.30 <br />M7 <br />3.40 moderately brig <br />coal <br />1038.30 <br />1040.00 <br />1.70 brittle <br />mudstone <br />medium- <br />grey <br />1040.00 <br />1047.10 <br />7.10 <br />mudstone/siltstone <br />medium <br />grey <br />1047.10 <br />1048.20 <br />N1 <br />1.10 moderately brig <br />coal <br />1048.20 <br />1048.90 <br />0.70 <br />mudstone <br />medium- <br />grey <br />1048.90 <br />1049.90 <br />N3 <br />1.00 moderately brig <br />coal <br />1049.90 <br />1055.00 <br />5.10 <br />sandstone /siltstone <br />medium <br />grey <br />1055.00 <br />1073.00 <br />18.00 <br />sandstone <br />medium <br />grey <br />1073.00 <br />1077.00 <br />4.00 brittle <br />mudstone /siltstone <br />medium- <br />grey <br />Ol <br />1077.00 <br />1077.50 <br />ZZ <br />0.50 <br />coal <br />black <br />1077.50 <br />1081.30 <br />3.80 <br />mudstone <br />grey <br />06- Aug -06 Rio Tinto Energy America - Colowyo Mine Page 4 of 5 <br />