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CENTRAL HEADQUARTERS 1 79
AIRBORNE MINERAL SURVEY AND EXPLORATION WING 80104
COAL WING 105 174
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analysis anomalies appears assemblage associated bands Barakar Formation base basin belt block boreholes Calcutta carried Central clay coal seams COALFIELD Code collected contain copper cores correlation covered deposits depth detailed developed DISTRICT Division drilling dykes east eastern elements established evaluation EXPLORATION extension fault field geological Geophysics gneisses Gondwana grained granite gravity ground Group heavy horizon identified INDEX India indicated interpretation intersected lignite limestone located Lower magnetic major Measures method mineralisation minerals nature objective observed occurs pattern PRADESH present processing quartz quartzite range Raniganj recorded regional reported represented revealed river rocks samples sand sandstone scale schist sector sediments sequence shale sq km strike structural suggest surface surveys taken thickness trending types units Upper valley values varies various veins volcanics western Wing zone