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activities analysis anomalies associated Asstt bands Barakar base basin belt block boreholes carried Central clay coal coal seams Coalfield collected completed continued core course covered database depth detailed Director Geologist district DIVISION drilling East eastern environmental evaluation exploration faults field season Formation four geological mapping Geologist Jr Geologist Sr geophysical geotechnical gneiss gold grade grained granite ground Group identified India indicated interpretation intersected investigation Kumar laboratory lignite limestone lineaments located magnetic major Measures mineral mineralisation Nagpur observed occur officers OPERATION Orissa period Pradesh prepared presence processing programme progress PROJECT PUBLICATION quartz range recorded regional REGIONAL EXPLORATION reports represented resource revealed river rocks samples sand scale schist sediment Shri soil southern sq km stage structural studies suggested surface survey taken TECHNICAL thickness trending units valley values varies various West Wing zone