2010-12-17_REVISION - C1981019 (129)

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• placed above each photograph. The "header board" should contain the title Colowyo — Collom, the hole number, core run number, core interval depths, and date. After the core is photographed, all core is logged for geotechnical features and lithology per the requirements of Call & Nicholas, Inc. and Colowyo Coal Company. The geotechnical engineer may sample the core for later strength testing and the geologist needs to record the intervals of the core taken. When descriptions are complete, the core is then broke into 2 -foot lengths or less to fit into core bags and then placed into core boxes with stabilizers (dividers). The core will be bagged and either tied or stapled shut. Each bag will be labeled with top and bottom depths, Collom project designation, and drill hole number. Coal seams greater than 1.5 feet are separated from the rock and bagged and boxed separately. When adequately filled, the box is taped closed. Boxes should be labeled with the following: Colowyo, Collom Project, hole number, depths of core in box, date (optional), sample numbers (optional), and box number. A separate series of boxes are used for the coal that is shipped to the lab. Coal Core Handling and Sampling Coal core must be handled with considerable care. The drilling contractor will not open the split tube containing a coal seam until the geologist is ready to immediately process the core. To minimize effects of moisture loss and desiccation in the field from the sun, the coal core will be shielded by covering • the coal with damp clean cloth or towels. The coal core will be bagged and either tied or stapled shut. Each bag will be labeled with top and bottom depths, sample number, Collom project designation, and drill hole number. The seam thickness cutoffs are as follows: Coal Seams above & including the GC Seam: < 1.5 feet Not Sampled unless associated with other thick coals > 1.5 feet Sampled by coal lithotype (coal, bone, parting, etc.) Coal Seams below & including the GC Seam: < 2.0 feet Not Sampled unless associated with other thick coals > 2.0 feet Sampled by coal lithotype (coal, bone, parting, etc.) Sampling methods are as follows: < 3.0 thick Sample in 2 foot increments or proportioned to fit into boxes. > 3.0 thick Sample 0.5 foot at the top and at the base of the seam; sample remainder of seam in 2 foot increments; seperately sample significant boney and dirty horizons and partings as follows: • N:\PROJECTS\ACTIVE PROJECTS \1158520037 RioTinto Coll— Pcrmil\Dralt P—it Tut Tables MapPDF,\ExbibitAEAiibii 611an 7 - Gmiogy Pre -F— ibility RywnWppaidi— \Appaidix F - Pronx M,\2004Gm1ogic Pra:alurus_rwisaLda; Page 2 Of 6 1/16/2009