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AIRBORNE MINERAL SURVEY AND EXPLORATION WING
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analysis anomalies associated bands Barakar base basin belt Bengal Bihar block bodies boreholes Calcutta carried Central clay coal coal seams COALFIELD Code collected comprising construction cores covered deposits depth detailed developed district Division drilling east Eastern evaluation exploration exposed extension fault field folds Formation geological geological mapping geophysical geotechnical gneiss grade grained granite grey ground Group horizon identified India indicated lignite limestone located Lower magnetic major measurements mineralisation minerals nature objective observed occur Orissa present proposed quartz quartzite range recorded regional Related represented revealed river rocks samples sand sandstone scale schist seams sediments sequence shale shear Singhbhum Special sq km stage strike structure suggested surface Survey taken thickness traverses trending types units Upper valley values varies various veins Wing zone