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• PROCEDURE FOR LOGGIPIG AND SAMPLICIG OVERBURDEN <br />CORES FOR CHEDIICAL 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 betcaeen 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 to}:en in that particular stratum. <br /> <br />6-2-2 <br />