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Drill Hole Lithology Summary <br />Rio Tinto Energy America - Colowyo Mine Page 528 of 1194 <br />From <br />To <br />Seam <br />Thickness Lithologic Qualifiers <br />Lithology Type <br />Shade <br />Color <br />254.40 <br />256.50 <br />2.10 <br />mudstone /siltstone <br />dark <br />grey <br />256.50 <br />262.00 <br />F5 <br />5.50 <br />coal <br />black <br />262.00 <br />265.00 <br />F6 <br />3.00 <br />coal <br />265.00 <br />267.15 <br />2.15 <br />carbonaceous mudston <br />black <br />267.15 <br />269.60 <br />2.45 <br />mudstone <br />dark <br />grey <br />269.60 <br />270.20 <br />F7 <br />0.60 <br />coal <br />black <br />270.20 <br />270.95 <br />F7 <br />0.75 <br />boney coal <br />black <br />270.95 <br />272.10 <br />F7 <br />1.15 <br />coal <br />black <br />272.10 <br />277.50 <br />5.40 silty <br />mudstone <br />dark <br />grey <br />277.50 <br />281.40 <br />3.90 <br />mudstone /siltstone <br />dark <br />grey <br />281.40 <br />284.05 <br />2.65 <br />mudstone <br />284.05 <br />286.30 <br />2.25 <br />mudstone /siltstone <br />286.30 <br />287.70 <br />1.40 <br />carbonaceous mudston <br />287.70 <br />290.60 <br />F9 <br />2.90 <br />coal <br />black <br />290.60 <br />291.15 <br />0.55 <br />carbonaceous mudston <br />291.15 <br />292.60 <br />1.45 <br />mudstone <br />• <br />292.60 <br />295.50 <br />2.90 <br />siltstone /mudstone <br />medium <br />grey <br />295.50 <br />300.10 <br />4.60 <br />mudstone <br />dark <br />grey <br />300.10 <br />306.50 <br />6.40 <br />sandstone <br />light <br />grey <br />306.50 <br />329.00 <br />22.50 interbedded <br />siltstone /mudstone <br />dark <br />grey <br />329.00 <br />333.00 <br />4.00 <br />sandstone <br />333.00 <br />336.30 <br />3.30 <br />mudstone <br />dark <br />grey <br />336.30 <br />339.10 <br />2.80 <br />mudstone /siltstone <br />339.10 <br />343.50 <br />4.40 <br />mudstone <br />dark <br />grey <br />343.50 <br />344.25 <br />0.75 <br />siderite <br />344.25 <br />347.00 <br />2.75 <br />mudstone /siltstone <br />347.00 <br />354.55 <br />FA <br />7.55 <br />coal <br />black <br />354.55 <br />356.75 <br />2.20 <br />carbonaceous mudston <br />black <br />356.75 <br />363.25 <br />FIB <br />6.50 <br />coal <br />black <br />363.25 <br />364.05 <br />0.80 <br />carbonaceous mudston <br />364.05 <br />365.05 <br />1.00 <br />siltstone <br />365.05 <br />365.95 <br />0.90 <br />carbonaceous mudston <br />365.95 <br />373.00 <br />G7 <br />7.05 <br />coal <br />black <br />373.00 <br />380.00 <br />G8 <br />7.00 <br />coal <br />black <br />380.00 <br />382.70 <br />G9 <br />2.70 <br />coal <br />black <br />382.70 <br />389.65 <br />6.95 <br />carbonaceous mudston <br />389.65 <br />394.30 <br />GA <br />4.65 <br />coal <br />black <br />• <br />394.30 <br />395.55 <br />1.25 <br />carbonaceous mudston <br />Rio Tinto Energy America - Colowyo Mine Page 528 of 1194 <br />