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Rio Tinto Energy America - Colowyo Mine Page 517 of 1194 <br />From <br />To <br />Seam <br />Thickness Lithologic Qualifiers <br />Lithology Type <br />Shade <br />Color <br />848.50 <br />851.25 <br />2.75 <br />siltstone /mudstone <br />light <br />grey <br />851.25 <br />852.20 <br />0.95 <br />carbonaceous mudston <br />852.20 <br />854.00 <br />M5 <br />1.80 <br />coal <br />black <br />854.00 <br />858.00 <br />4.00 <br />mudstone <br />dark <br />grey <br />858.00 <br />859.30 <br />1.30 <br />mudstone /sandstone <br />859.30 <br />860.20 <br />M7 <br />0.90 <br />coal <br />black <br />860.20 <br />861.10 <br />0.90 <br />carbonaceous mudston <br />861.10 <br />861.50 <br />0.40 <br />coal <br />black <br />861.50 <br />862.75 <br />1.25 <br />mudstone <br />862.75 <br />863.70 <br />0.95 <br />mudstone /siltstone <br />863.70 <br />864.50 <br />0.80 <br />mudstone <br />864.50 <br />867.30 <br />2.80 interbedded <br />siltstone /sandstone <br />867.30 <br />867.80 <br />0.50 <br />siderite <br />867.80 <br />870.65 <br />2.85 <br />mudstone <br />870.65 <br />871.00 <br />0.35 <br />coal <br />black <br />871.00 <br />871.80 <br />0.80 <br />carbonaceous mudston <br />871.80 <br />874.85 <br />N5 <br />3.05 <br />coal <br />874.85 <br />875.25 <br />N5 <br />0.40 <br />carbonaceous mudston <br />875.25 <br />876.20 <br />N5 <br />0.95 <br />coal <br />black <br />876.20 <br />878.40 <br />2.20 <br />sandstone <br />light <br />grey <br />878.40 <br />879.00 <br />0.60 <br />mudstone <br />879.00 <br />880.40 <br />1.40 <br />mudstone /siltstone <br />880.40 <br />882.50 <br />2.10 <br />siltstone /mudstone <br />882.50 <br />884.25 <br />1.75 <br />sandstone <br />light <br />grey <br />884.25 <br />885.30 <br />1.05 <br />siltstone /mudstone <br />885.30 <br />894.95 <br />9.65 <br />mudstone <br />dark <br />grey <br />894.95 <br />896.50 <br />01 <br />1.55 <br />coal <br />black <br />896.50 <br />898.40 <br />1.90 <br />siltstone <br />medium <br />grey <br />898.40 <br />899.00 <br />0.60 <br />mudstone <br />899.00 <br />901.45 <br />03 <br />2.45 <br />coal <br />black <br />901.45 <br />902.20 <br />0.75 <br />carbonaceous mudston <br />902.20 <br />903.65 <br />1.45 <br />siltstone /sandstone <br />light <br />grey <br />903.65 <br />922.00 <br />18.35 <br />mudstone /siltstone <br />dark <br />grey <br />922.00 <br />922.40 <br />TC <br />0.40 <br />coal <br />black <br />922.40 <br />922.40 <br />TCT <br />0.00 <br />922.40 <br />931.00 <br />STCM <br />8.60 <br />sandstone <br />white <br />931.00 <br />932.20 <br />STCM <br />1.20 <br />mudstone /siltstone <br />932.20 <br />960.00 <br />STCM <br />27.80 <br />sandstone <br />white <br />Rio Tinto Energy America - Colowyo Mine Page 517 of 1194 <br />