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abutment alignment alluvium amphibolite Andhra Pradesh Archaean bands basalt bauxite bedrock biotite block boreholes carried out systematic charnockite Circle clay Coalfield cores Deccan Trap deposits depth to water dips Director district Division dolerite dolomite drill holes excavation exploration exploratory drilling exposed fault folded foliation Formation garnetiferous geohydrological geological mapping Geologists geophysical gneisses grade granite gneiss graphite grey groundwater grout Himachal Pradesh Hydel indicated intruded investigation Irrigation Jammu Kashmir km on scale laboratory laterite limestone located logged mapped an area mapped on scale meterage metres million tonnes mineral mineralisation Mysore nala occur pegmatite phosphorite phyllite pits power house Project pyrite quartz veins quartzite recommended Region river rock types samples sandstone Sarvashri schist seams sediments shale shear zones Shri Singh slate spillway sq km strike length studies surveys syncline systematic geohydrological taluk thickness Topo topo-sheets traverse trending tubewells tunnel upstream upto Uttar Pradesh valley varies