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Rio Tinto Energy America - Colowyo Mine Page 530 of 1194 <br />From <br />To <br />Seam <br />Thickness Lithologic Qualifiers <br />Lithology Type <br />Shade <br />Color <br />607.30 <br />607.80 <br />0.50 <br />carbonaceous mudston <br />607.80 <br />608.90 <br />1.10 <br />mudstone <br />608.90 <br />633.70 <br />24.80 silty <br />mudstone /siltstone <br />dark <br />grey <br />633.70 <br />638.00 <br />4.30 <br />siltstone <br />light <br />grey <br />638.00 <br />649.30 <br />11.30 <br />sandstone <br />light <br />grey <br />649.30 <br />653.60 <br />17 <br />4.30 <br />coal <br />653.60 <br />658.30 <br />4.70 <br />carbonaceous mudston <br />black <br />658.30 <br />683.00 <br />24.70 <br />sandstone <br />medium <br />grey <br />683.00 <br />692.00 <br />9.00 <br />mudstone <br />dark <br />grey <br />692.00 <br />695.60 <br />3.60 <br />carbonaceous mudston <br />dark <br />grey <br />695.60 <br />699.00 <br />J2 <br />3.40 <br />coal <br />black <br />699.00 <br />701.75 <br />J4 <br />2.75 <br />coal <br />701.75 <br />703.45 <br />1.70 <br />carbonaceous mudston <br />black <br />703.45 <br />704.70 <br />J6 <br />1.25 <br />coal <br />black <br />704.70 <br />705.60 <br />0.90 <br />carbonaceous mudston <br />black <br />705.60 <br />706.30 <br />0.70 <br />mudstone <br />dark <br />grey <br />• <br />706.30 <br />707.55 <br />1.25 <br />siltstone /mudstone <br />medium <br />grey <br />707.55 <br />709.70 <br />2.15 <br />mudstone /siltstone <br />medium <br />grey <br />709.70 <br />710.40 <br />0.70 <br />siderite <br />710.40 <br />711.40 <br />1.00 <br />mudstone <br />711.40 <br />712.50 <br />1.10 <br />mudstone /siltstone <br />712.50 <br />715.05 <br />J8 <br />2.55 <br />coal <br />black <br />715.05 <br />716.45 <br />1.40 <br />carbonaceous mudston <br />716.45 <br />719.30 <br />2.85 <br />mudstone <br />dark <br />grey <br />719.30 <br />720.40 <br />1.10 <br />mudstone /siltstone <br />720.40 <br />721.45 <br />1.05 <br />siltstone /mudstone <br />721.45 <br />724.10 <br />2.65 <br />carbonaceous mudston <br />724.10 <br />726.45 <br />K3 <br />2.35 <br />coal <br />black <br />726.45 <br />729.05 <br />2.60 <br />carbonaceous mudston <br />dark <br />grey <br />729.05 <br />730.50 <br />1.45 <br />mudstone /siltstone <br />730.50 <br />732.30 <br />1.80 <br />mudstone <br />dark <br />grey <br />732.30 <br />732.45 <br />0.15 <br />siderite <br />732.45 <br />733.10 <br />0.65 <br />carbonaceous mudston <br />733.10 <br />736.40 <br />K5 <br />3.30 <br />coal <br />black <br />736.40 <br />738.55 <br />2.15 <br />mudstone <br />738.55 <br />744.80 <br />6.25 very hard <br />siltstone /mudstone <br />medium <br />grey <br />744.80 <br />745.80 <br />1.00 <br />mudstone <br />dark <br />grey <br />745.80 <br />746.50 <br />0.70 <br />boney coal <br />Rio Tinto Energy America - Colowyo Mine Page 530 of 1194 <br />