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CENTRAL HEADQUARTERS 150
ANTARCTICA DIVISION 5159
BHUTAN UNIT 6089
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abyssal plain aeromagnetic aeromagnetic surveys amphibolite AMSE Wing analysis anomalies assemblage Barakar Barakar Formation Barren Measures basin bathymetric Bengal Bhutan Bihar block boreholes carbonaceous carried central clay coal seams COAL WING Coalfield coarse coast Code core covered cruise depth range DISTRICT Division east eastern EXPLORATION FOR COAL fault field season geochemical GEOLOGICAL MAP geophysical gneiss gold Gondwana grade grained granite gravity grey ground evaluation heavy minerals India indicated intersected intrusives investigation isobaths lignite limestone bands linear located MADHYA PRADESH magnetic metamorphic mineralisation northern NW-SE occur phyllite programme quartz quartzite Raniganj REGIONAL EXPLORATION ridge rocks samples sand sandstone scale scams schist schist belt seabed seam zones sector sediments sequence SHAHDOL DISTRICT shale shallow shear shelf slope Sohagpur sq km strike length structural studies sulphide surface surveys Talchir thickness Thimphu toposheet trending ultramafic upto varies volcanics water depths