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GEOLOGICAL SURVEY OF INDIA
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alignment Andhra Assistant associated Asstt bands bank boreholes Calcutta carried Central charnockite Circle clay coal coalfield collected completed comprising consists construction continued covered deposits depth detailed dips district Division dolomite drilling east Engineer examined exploration exposed fault field folded formations foundation geological geological mapping Geologists Geophysical gneiss Gondwana grade granite groundwater Headquarters hill holes India indicated laboratory limestone located Long lower Madras mapped Scale measures meeting million tonnes mineral mineralisation Mines northern occur Office pegmatite period phyllite pits places Pradesh Project proposed quartz quartzite recommended Regional Regional Office reports reserve river rock rock types samples sandstone Sarvashri schist seams seen Senior shale sheets Shri Southern spillway strike structure studies suggested Superintending Survey thickness thin tion trend tunnel University Upper valley varies veins zone