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Rio Tinto Energy America - Colowyo Mine Page 515 of 1194 <br />From <br />To <br />Seam <br />Thickness Lithologic Qualifiers <br />Lithology Type <br />Shade <br />Color <br />615.90 <br />619.90 <br />4.00 <br />mudstone <br />dark <br />grey <br />619.90 <br />620.30 <br />15 <br />0.40 <br />boney coal <br />black <br />620.30 <br />620.55 <br />15 <br />0.25 <br />boney coal <br />black <br />620.55 <br />625.65 <br />15 <br />5.10 <br />coal <br />black <br />625.65 <br />630.00 <br />4.35 <br />mudstone <br />630.00 <br />640.50 <br />10.50 <br />siltstone /mudstone <br />medium <br />grey <br />640.50 <br />641.00 <br />0.50 <br />coal <br />black <br />641.00 <br />651.00 <br />10.00 <br />siltstone /mudstone <br />medium <br />grey <br />651.00 <br />651.80 <br />0.80 <br />coal <br />black <br />651.80 <br />655.00 <br />3.20 <br />siltstone /mudstone <br />655.00 <br />659.90 <br />4.90 <br />siltstone /sandstone <br />light <br />grey <br />659.90 <br />660.40 <br />0.50 <br />sandstone <br />660.40 <br />664.30 <br />17 <br />3.90 <br />coal <br />black <br />664.30 <br />664.80 <br />17 <br />0.50 <br />rashy coal <br />664.80 <br />672.40 <br />7.60 <br />carbonaceous mudston <br />dark <br />grey <br />672.40 <br />675.00 <br />2.60 <br />mudstone <br />0 <br />675.00 <br />689.50 <br />14.50 <br />sandstone /siltstone <br />light <br />grey <br />689.50 <br />696.40 <br />6.90 <br />mudstone /siltstone <br />dark <br />grey <br />696.40 <br />698.85 <br />J2 <br />2.45 <br />coal <br />black <br />698.85 <br />699.60 <br />0.75 <br />carbonaceous mudston <br />699.60 <br />702.90 <br />3.30 <br />mudstone <br />dark <br />grey <br />702.90 <br />703.30 <br />0.40 <br />siderite <br />703.30 <br />706.00 <br />2.70 <br />mudstone <br />dark <br />grey <br />706.00 <br />707.00 <br />J4 <br />1.00 <br />coal <br />black <br />707.00 <br />708.85 <br />J6 <br />1.85 <br />coal <br />708.85 <br />709.35 <br />J6 <br />0.50 <br />boney coal <br />black <br />709.35 <br />710.10 <br />0.75 <br />mudstone <br />710.10 <br />710.90 <br />0.80 <br />sandstone <br />710.90 <br />711.45 <br />0.55 <br />mudstone <br />711.45 <br />711.65 <br />ZZ <br />0.20 <br />coal <br />711.65 <br />713.70 <br />2.05 sandy <br />mudstone <br />dark <br />grey <br />713.70 <br />715.10 <br />1.40 <br />siderite <br />715.10 <br />717.30 <br />2.20 <br />mudstone /siltstone <br />dark <br />grey <br />717.30 <br />719.65 <br />J8 <br />2.35 <br />coal <br />black <br />719.65 <br />720.10 <br />0.45 <br />carbonaceous mudston <br />dark <br />grey <br />720.10 <br />722.90 <br />2.80 <br />mudstone <br />dark <br />grey <br />722.90 <br />728.80 <br />5.90 interbedded <br />mudstone /siltstone <br />• <br />728.80 <br />731.70 <br />2.90 <br />mudstone <br />dark <br />grey <br />Rio Tinto Energy America - Colowyo Mine Page 515 of 1194 <br />