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12-inch dia analyses Andhra Assistant associated bands beds belt block boreholes carried cent clay coal coalfield collected consists construction contains continued converted copper covered deposits detailed dips district drawdown Drilled east Elevation ending estimated examined exploratory fault feet field formations furlongs geological geological mapping Geologists gneisses grade granites Gravel Gravel for shrouding groundwater hill housing installed inch slot included India indicated land surface limestone located Lower m.s.l. Drilled Madhya March miles milestone million tons mineralisation minerals mines minutes Nagaur occur officers openings pegmatites Pradesh prior quartz veins quartzites recorded reports reserves river road rocks samples sand sandstones Sarvashri saturated granular zones scale schist seams shales sheets Shri slotted sections Srivastava Static water level strike structure suitable Survey test pumping thickness tubewells turbine pump Upper varies Yield zones at depths