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amphibolite anomaly associated bands bank basic basin belt Bihar biotite block bodies boreholes carried charnockite clay Code collected Complex comprises construction continued covered deposits depth detailed DISTRICT Division drilled dykes east eastern excavation exploration exposed extending fault field folds foliation Formation foundation GEOLOGICAL MAP geophysical geotechnical GEOTECHNICAL INVESTIGATION gneiss gold grade grained granite grey Group hill holes INDEX indicated joints length limestone located lower major material mineral mineralisation nature observed occur Orissa phase pink places present proposed quartz quartz veins quartzite ranging Regional represented reservoir river rock samples sand sandstone scale schist sediments seen shale shear slope soil spillway sq km stage strike structure suggested sulphide surface surveys taken thick thin traverses trending tunnel types units Upper upto valley values varying zone