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One of the chief characteristics of the Cameo coal is the relatively <br />• large amount of bone-coal whose ash content commonly exceeds 50 percent. <br />Carbonaceous shale beds are occasionally present within the coal seam. <br />The lower foot or so commonly contains grains of windblown quartz sand, <br />especially where the lover boundary is in.nediately above the Rollins <br />Sandstone, from which the Coal is separated on this lease by 5 to 30 <br />feet of Carbonaceous siltstone and silty sandstone, often somewhat <br />coaly. <br />Another distinctive feature of the Cameo is the presence of sand- <br />stone dikes. These dikes vary from inches to several feet in thickness <br />and may intrude all or only part of the seam. They are known wherever <br />the Cameo has been mined, but appear to be most common in the Mount <br />Lincoln area, 1 to 2 miles north of the subject area. They are extremely <br />• rare in the developed portion of the Roadside property immediately to <br />• the north. The dikes are lithologicaLy identical to the Rollins sand- <br />stone, which is the source of 'the material. Hopefully they will not be <br />a hinderance to Longwall type mining techniques. <br />The Cameo ranges from 5.66 .to 9.51 feet in thickness, averaging <br />7.61 feet. It i.s thickest in the north part of the lease, and appears <br />to thin to the south and east. These thicknesses include boney coal and <br />siltstone partings where present. The following table shows individual <br />thicknesses and depths determined by drilling: <br />Hole No'. Thickness, ft. Depth, ft. <br />CC-76-1 9.39 376.57 <br />CC-76-2 9.24 579.00 <br />CC-76-3 7.37 416.35 <br />CC-76-4 6.50 (e-log) 797.40 <br />CC-76-5 9.51 107.55 <br />• CC-76-6 <br />CC-76-7 8.53 <br />7.00 168.42 <br />641.61 <br />CC-77-1 5.97 863.28 <br />CC-77-2 5.66 1,302.10 <br />Average Thickness 7.61 <br />