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06- Aug -06 Rio Tinto Energy America - Colowyo Mine Page 2 oj5 <br />Drill Hole Lithology Summary <br />Drill Hole <br />Easting <br />- Northing Collar Total Depth <br />Township Range Section File <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 />• <br />Adjusted Depths <br />From <br />To <br />Seam <br />Thickness Lithologic Qualifiers <br />Lithology Type <br />Shade <br />Color <br />334.40 <br />340.30 <br />C5 <br />5.90 moderately brig <br />coal <br />340.30 <br />342.30 <br />C7 <br />2.00 moderately brig <br />coal <br />342.30 <br />348.00 <br />5.70 <br />mudstone /siltstone <br />medium- <br />grey <br />348.00 <br />352.00 <br />4.00 <br />sandstone /siltstone <br />medium <br />grey <br />352.00 <br />353.80 <br />1.80 brittle <br />mudstone/siltstone <br />medium- <br />grey <br />353.80 <br />354.60 <br />0.80 very fissile <br />carbonaceous shale <br />dark <br />brown <br />354.60 <br />355.80 <br />D1 <br />1.20 moderately brig <br />coal <br />355.80 <br />356.00 <br />D1 <br />0.20 <br />tuff/tonstien <br />356.00 <br />357.50 <br />131 <br />1.50 coal 8 parting <br />core loss <br />357.50 <br />363.50 <br />D2 <br />6.00 moderately brig <br />coal <br />363.50 <br />364.20 <br />0.70 parting <br />mudstone <br />very dark <br />brown <br />364.20 <br />366.80 <br />D3 <br />2.60 moderately brig <br />coal <br />366.80 <br />368.00 <br />1.20 <br />carbonaceous mudston <br />very dark <br />brown <br />368.00 <br />380.00 <br />12.00 <br />sandstone <br />medium <br />grey <br />380.00 <br />382.80 <br />2.80 <br />mudstone <br />very dark <br />grey <br />382.80 <br />384.90 <br />E2 <br />2.10 moderately brig <br />coal <br />384.90 <br />391.00 <br />6.10 brittle <br />mudstone /siltstone <br />medium- <br />grey <br />391.00 <br />399.00 <br />8.00 <br />siltstone <br />medium <br />grey <br />399.00 <br />407.50 <br />8.50 silty <br />sandstone /siltstone <br />medium -1 <br />grey <br />407.50 <br />409.60 <br />F1 <br />2.10 moderately brig <br />coal <br />409.60 <br />412.00 <br />2.40 clayey <br />mudstone <br />medium- <br />grey <br />412.00 <br />417.00 <br />5.00 <br />sandstone <br />medium <br />grey <br />417.00 <br />420.30 <br />3.30 <br />mudstone <br />medium- <br />grey <br />420.30 <br />420.90 <br />F2 <br />0.60 moderately brig <br />coal <br />• <br />420.90 <br />426.00 <br />5.10 <br />mudstone <br />medium- <br />grey <br />426.00 <br />436.00 <br />10.00 <br />sandstone <br />medium <br />grey <br />436.00 <br />439.20 <br />3.20 <br />mudstone <br />medium- <br />grey <br />439.20 <br />443.30 <br />F3 <br />4.10 moderately brig <br />coal <br />443.30 <br />444.80 <br />1.50 <br />mudstone <br />very dark <br />brown <br />444.80 <br />445.30 <br />ZZ <br />0.50 moderately brig <br />coal <br />445.30 <br />448.00 <br />2.70 <br />mudstone <br />medium- <br />grey <br />448.00 <br />454.00 <br />6.00 <br />siltstone <br />medium <br />grey <br />454.00 <br />470.00 <br />16.00 <br />sandstone <br />medium <br />grey <br />470.00 <br />506.00 <br />36.00 interbedded <br />siltstone /sandstone <br />medium- <br />light grey <br />506.00 <br />523.00 <br />17.00 <br />sandstone <br />medium <br />grey <br />523.00 <br />526.00 <br />3.00 <br />mudstone <br />medium- <br />grey <br />526.00 <br />529.00 <br />3.00 <br />sandstone <br />medium <br />grey <br />529.00 <br />532.00 <br />3.00 brittle <br />mudstone /siltstone <br />medium- <br />grey <br />532.00 <br />536.00 <br />4.00 <br />sandstone <br />medium <br />grey <br />536.00 <br />541.00 <br />5.00 brittle <br />mudstone /siltstone <br />medium- <br />grey <br />541.00 <br />544.50 <br />3.50 sandy <br />siltstone <br />medium <br />grey <br />544.50 <br />545.80 <br />1.30 brittle <br />mudstone <br />mediumd <br />grey <br />545.80 <br />549.00 <br />F5 <br />3.20 moderately brig <br />coal <br />549.00 <br />566.50 <br />17.50 brittle <br />mudstone/sitstone <br />medium- <br />grey <br />566.50 <br />569.30 <br />F6 <br />2.80 moderately brig <br />coal <br />569.30 <br />570.00 <br />0.70 <br />mudstone <br />medium- <br />grey <br />570.00 <br />571.30 <br />ZZ <br />1.30 moderately brig <br />coal <br />571.30 <br />578.60 <br />7.30 brittle <br />mudstone /siltstone <br />medium- <br />grey <br />578.60 <br />581.35 <br />FA <br />2.75 <br />coal <br />581.35 <br />581.40 <br />FA <br />0.05 <br />tuff/tonstien <br />581.40 <br />585.00 <br />FA <br />3.60 <br />coal <br />• <br />585.00 <br />591.80 <br />FS <br />6.80 moderately brig <br />coal <br />591.80 <br />595.60 <br />G7 <br />3.80 moderately brig <br />coal <br />06- Aug -06 Rio Tinto Energy America - Colowyo Mine Page 2 oj5 <br />