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AIRBORNE MINERAL SURVEYS EXPLORATION WING 28
MARINE WING 4757
CENTRAL REGION 58 89
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alluvium amphibolite analysis anomaly associated Asstt bands basalt basin bed rock Bihar biotite block boreholes carried chalcopyrite charnockite clay coalfield comprising Construction stage core deposits depth Director Geologist Director Shri district Code DIVISION Director DIVISION Headquarters drilling dykes excavation exploration exposed Formation foundation geochemical geological investigation geological mapping Geologist Geologist Jr geomorphological Geophysicist geotechnical investigation gneiss gold Gondwana grained granite granite gneiss granitoids Group holes indicated investigation was taken km long Kumar limestone line km located logging migmatite mineral mineralisation occur Orissa pegmatite phyllite power house Pradesh Precambrian project envisages construction quartz quartz veins quartzite Quaternary Rajasthan Raniganj Rao Shri river rock types samples were collected sand sandstone scale schist schist belt sediments shale shear zone Shri A. K. Singhbhum spillway sq km sq km area stage geotechnical investigation strike length studies Supergroup surface thick tion Toposheet traverse trending tunnel upto volcanics West Bengal