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abutment alignment ANDHRA PRADESH appears Assistant associated bands bank Barakars Bihar boreholes carried cent Central Circle clay coal seams coalfield collected comprise consist construction containing continued copper covered deposits depth detailed dips district Division dolerite dolomite drilling dykes east Engineer examined exposed fault five folded foliation formations foundation geological Geologists Geophysical gneiss grade granite granite gneiss Headquarters hill holes in-Charge India indicated intruded joints kilometres Laboratories laterite limestone located Long Lower mapped Scale metres million mineral mineralisation occur Office pegmatite period phyllite places Pradesh Project proposed quartz veins quartzite recommended recorded Regional reported reserves river river bed rock types samples sand sandstone Sarvashri schist shale sheets Shri slate spillway Srivastava strike studies suggested suitable Survey thick tion tonnes trend tunnel Upper valley varying zone