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abutment alignment amphibolite Andhra Pradesh assess bands basin bed rock biotite biotite gneiss block boreholes carried charnockite coast cut-off trench depth district dolerite drilled dunes dykes earth dam enclaves excavation exposed ﬁeld season ﬁne ﬁrst ﬂank ﬂow folds foliation Formation foundation fresh rock garnet Geochemical Mapping geological mapping GEOTECHNICAL INVESTIGATION gneiss gold grained granite granite gneiss granitoids granodiorite granulite grouting hornblende indicated intrusive Karnataka Kerala Khondalite kimberlite limestone lithounits located lugeons maﬁc migmatite mineralisation minerals moderate mylonite NNW-SSE NW-SE occur ofthe overburden pegmatite permeability tests phyllite plagioclase powerhouse project authorities proposed pyroxene quartz quartz veins quartzite reservoir river samples were collected sand schist belt shale shear zone shotcrete slope soil Specialised Thematic Mapping spillway STAGE GEOTECHNICAL stream sediment samples structure studies sulphide Tamil Nadu thick toposheet traverse trending tsunami ultramaﬁc upto values varies vertical weathered weir width