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OI EASTERN REGION
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anomalies associated Asstt attended bands block bodies boreholes carried Central Circle clay coal collected completed comprising conducted construction continued copper core covered deposits depth detailed dips Director district Division dolomite drilling electrical Engineering estimated examined exploration exploratory exposed extension fault field formations foundation geological geological mapping Geologist geophysical gneisses grade granite groundwater holes included India indicated investigations Laboratory length lignite limestone located logging Long magnetic material measures meeting metal method mineralisation minerals Mining Nagpur nature observed occurs period phyllite places Pradesh present Project quartz quartzite ranging recommended recorded Region reported resistivity river rock samples sand sandstones Sarvashri scale schist seams seismic shales shear Shri strike structural studies suggested surface surveys tests thickness tonnes topo-sheets trending tunnel types upto valley varies veins zone