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PROCEDURE FOR LOGGING AND SAMPLING OVERBURDEN <br /> CORES FOR CHEMICAL ANALYSIS <br /> A. In the Field <br /> 1. All pertinent information about the core is recorded. <br /> a. Location <br /> b. Total length of core <br /> C. Coal seams involved <br /> d. Depth from land surface to top of core <br /> e. Elevation of land surface <br /> f. Any physical irregularity, e. g. , extremely <br /> hard stratus between 57-64 ' <br /> 2 . Sampling and logging starts from top of core. <br /> 3. The core is divided into the six rock types; sandstone, <br /> shale, mudrock, limestone, intercolate, carbolith, and <br /> chert. The rock type and its thickness are recorded <br /> along with color (red, green, etc. ) , fossils (plants, <br /> or animals) , slickensides (prominent or present) , nodules , <br /> and any other descriptive information which can be ob- <br /> served. <br /> B. In the Preparation Room <br /> 1. Using the drillers log, the core can easily be subdivided <br /> for grinding and ultimately chemical evaluation. <br /> 2. Each individual stratum is pulverized (60 mesh) separately <br /> using the following guidelines: <br /> a. If a rock member is less than 1 foot, it is logged <br /> but not sampled unless it is a layer of special <br /> interest, e.g. , containing visible pyrite, limestone , <br /> etc. <br /> b. If the rock member is of considerable thickness , e. g. <br /> 30 feet, the number of samples taken from this section <br /> depends on rock type. Sandstone, Intercolates, and <br /> Chert are normally sampled every 5 feet; while shale, <br /> mudrock , limestone or carbolith would be sampled every <br /> 3 feet. Therefore , 6 and 10 samples repsectively <br /> would be taken in that particular stratum. <br /> 6-2-2 <br />