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abandoned alignment altitude Andhra aquifer Assistant bands belt Bihar Bombay boreholes carried cent Circle clay coal coalfield collected consist construction continued covered deposits depth detailed district East Economic Geology encountered ending examined exploration exploratory exposed field formations formed foundation furlongs further G.S.I. bench-mark gallons geological Geologists gneisses gold grade granite groundwater Headquarters hills hole included India indicated Industr lignite limestone Located lode Lower m.s.l. Drilled M.Sc Madhya Madras March material miles mineral mining Mysore occur occurrence officers places Pradesh Project proposed quarry quartz quartzites Rajasthan recommended recorded region reported reserves river road rocks samples sand sandstones Sarvashri scale schists seams shales Shri soil Srivastava strike suggested suitable surface Survey thick thin tunnel Upper varies veins village yield zone