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WEST BENGAL SIKKIM A N ISLANDS
Report of investigation for rare metal mineralisation within pegmatite
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acid volcanics amphibolite anomaly Arunachal Pradesh Assam bands basemetal basin bed rock belt Bihar biotite block boreholes Chhotanagpur clay Code comprising covered depth Division drilling east eastern Engineering Geology exploration exposed fault feldspar ﬁeld season ﬁne ﬁrst ﬂood ﬂow fold foliation Formation geochemical geological mapping geophysical GEOTECHNICAL INVESTIGATION gneiss gneissic gold Gondwana grade granite granite gneiss grey Group of rocks GSI Rec identiﬁed Karbi Anglong limestone lineament located mapped area medium grained Meghalaya mineralisation minerals occurs Orissa OVERVIEW pegmatite phyllite plagioclase Proterozoic Purulia Purulia district quartz quartz veins quartzite Region river sand sandstone scale schist sector sequence shale shear zone Shillong Shillong Group signiﬁcant Sikkim siltstone Singhbhum slope soil spillway sq km STAGE GEOTECHNICAL INVESTIGATION structure sulphide surface survey terrain thick toposheet trending upto West Bengal