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20 feet abutment Archaean Assistant Geologist B. C. Roy band beryl Bihar Bombay brine calcite cement cent charnockites coal coalfield colour Cuddapah dam-site deposits depth dolomite drilling Dungri dykes east eastern estimated examined excavation exposures felspar ferruginous fossils furlongs Geol geological mapping Geological Survey geophysical Ghosh gneisses Gondwana grade granite grey hill horizon inches India investigated iron-ore kankar Kharaghoda kyanite laterite lignite lime limestone M. S. Krishnan Madhya Pradesh Madras manufacture material Messrs mica miles million tons mineral mines Mirzapur district Mysore nala north-west occur ochre Orissa outcrops pegmatites phyllites pits production quantity quarries quartz quartz veins quartzites railway reported reserves Returned to headquarters river bed rocks samples sand sandstones schists seam shales sheet silica Singhbhum south-east south-west strike Survey of India taluk thickness thin Uttar valley village 23 Vindhya western width zone