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GEOLOGICAL SURVEY OF INDIA
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alignment alluvium Andhra anomaly Assistant Asstt bands bank boreholes Calcutta carried Central Circle clay coal coalfield collected consists construction continued covered deposits depth detailed dips district Division dolomite drilling east Engineer examined exploration exposed fault field folded formations foundation geological Geologists Geophysical gneiss granite groundwater Headquarters hill India indicated investigation laboratory lignite limestone located Long lower Madras magnetic mapped Scale measurements meeting million mineral mineralisation northern occurs Office pegmatite period phyllite places possible Pradesh prepared Project proposed quartz quartzite range recommended Regional Regional Office reports reserve river rock rock types samples sand sandstone Sarvashri schist seams Senior shale sheets Shri strike studies suggested suitable surface surveys thickness tion tonnes traverse trend tubewells tunnel Upper valley varies veins water supply zone