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analysed anomaly associated Asstt bands basic basin belt Bihar block bodies boreholes Calcutta carried Central channel Circle clay coal collected conglomerate contain continued cores covered deposits depth detailed developed dips Director district Division drilling east eastern Engineer examined exploration exposed fault field flows folds Formation fossils foundation Geol geological Geologist Geophysical gneiss grade granite Group Headquarters hill India indicated intrusive Iron Laboratory length limestone located Lower major mapped metamorphism mineral mineralisation Nagpur observed occur Officer phyllite Pradesh Precambrian prepared present Project proposed quartz quartzite range recorded Region reported represented river rocks S/Shri samples sand sandstone scale schist seams sediments sequence shale shear Shri Singhbhum soil southern sq km strike structures studies suggested Survey thick traverse trending types units Upper valley veins volcanic zone