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