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CENTRAL HEADQUARTERS 1 79
AIRBORNE MINERAL SURVEY AND EXPLORATION WING 80104
COAL WING 105 174
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analysed anomaly associated bands bank base basin belt Bengal Bihar block bodies boreholes Calcutta carried Central channel clay coal COALFIELD Code collected complex construction cores covered deposits depth detailed developed district Division drilling east Eastern Engineering evaluation exploration exposed extension fault field folds Formation foundation geological mapping geophysical geotechnical gneiss grade grained granite ground Group hills horizon identified India indicate investigation length lignite limestone located lower magnetic major measures mineral mineralisation nature objective observed occur Orissa pegmatite places present proposed quartz quartzite range recorded regional represented river rocks samples sand sandstone scale scheme schist seams sediments shale shear slope Special spillway sq km stage strike structure suggested surface Survey taken thickness traverses trending types units Upper valley values varies veins Wing zone