Investigation of the Feasibility of Natural Gamma Radiation Coal Interface Detection Method in U.S. Coal Seams.
Society for Mining, Metallurgy, and Exploration Annual Meeting, 1990 :1-11
One critical element of the U.S. Bureau of Mines autonomous mining research program is the development of a reliable coal interface detection (cid) system. Several candidate cid concepts currently being investigated by the Bureau include vibration, passive infrared, radar, and natural gamma radiation (ngr). To establish which cid sensor technologies need to be developed for a given seam, coal and adjacent rock samples (i.e., immediate roof and floor) are being collected from selected U.S. major coal seams and analyzed in terms of ngr and other geophysical measurements. Results of the ngr measurements indicate that, in general, all shale and shalelike materials (e.g., drawslate, slate, and fire clay) have higher ngr readings than the coal seam. Consequently the ngr method appears to be a potentially useful cid tool, provided that the immediate roof and floor are both composed of a high percentage of shale-type material.
Mining-industry; Underground-mining; Robotics; Coal-mining
Society for Mining, Metallurgy, and Exploration, Inc.