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Settlement risk zone recognition using high resolution satellite data in jharia coal field, dhanbad, India
P. Kumar, D. Kumar, V.P. Mandal, , M. Rani, V. Tomar
Published in
Volume: 9
Issue: 1 SUPPL.
Pages: 1 - 6
Coal is the most abundant fossil fuel resource present in Jharia. This is the most exploited coal field because of available metallurgical grade coal reserves. Mining in this coal field was initially in the hands of private entrepreneurs, who had limited resources and lack of desire for scientific mining. The mining method comprised of both open cast as well as underground. The open cast mining areas were not back filled, so large void is present in the form of abandoned mining. Extraction of thick seam by caving in past at shallow depth has damaged the ground surface in the form of subsidence and formation of pot holes or cracks reaching up to surface, enhancing the chances of spontaneous heating of coal seams and mine fire. This coal field is engulfed with about 70 mine fires, spread over an area of 17.32 sq. km., blocking 636 million tonnes of coking coal and 1238 million tonnes of non-coking coal. Around 34.97 sq. km. area of the Jharia Coal Field (JCFis under subsidence. It is mentioned in JCF reconstruction program that 70% of the underground production of coal would come by caving and balance 30% by stowing and thus about 101 sq. km. underground mining area would be affected by subsidence. The other factor, which damages the land in JCF, is opencast mining and overburden dumps. Most of the built-up area is under risk zone because of mine fires activities. Mine fire and surface subsidence is the major problem in the JCF. The present study shows the settlement under risk zone using the high resolution merged data.
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