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active fault alignment amphibolite anorthosite arsenic Arunachal Pradesh Assam augen gneiss bands basic granulite biotite biotite gneiss carried charnockite clay coarse grained comprises dam axis depth DETAILED CORRIDOR MAPPING dipping DIVISION REVIEW East Khasi exposed feldspar field season fold foliation Formation gabbroic anorthosite Geochemical Mapping geotechnical investigation gneiss granite granulite gravity grey H.E. Project Hazard Zone holes hornblende Jadukata Jaintia Hills district Kakching Khasi Hills district Kynshi Leikai located Lower Dibang Valley magnetite Manipur mapped area Mawpyut Mayudia medium grained medium to coarse Meghalaya metamorphism minerals Mizoram NE-SW NW-SE overburden phyllite pink granite gneiss plagioclase porphyritic porphyritic granite power house Proterozoic quartz quartzite Quaternary REGION Ri-Bhoi Riangdo river sandstone scale schist shale Shillong Shillong Group sillimanite siltstone slope sq km STAGE GEO-TECHNICAL INVESTIGATIONS stations studies surge shaft tectonic Thematic Mapping thick toposheet Umpyrtha West Kameng district West Khasi Hills