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alignment appears associated Astarte axis bands bank beds belt boreholes carried cent clay coal coalfield collected construction contain covered Delhi deposits depth detailed dips district Division drilling east examined exploration exposed extends fault fold formations further Geol geological Geologists gneisses grade grains granite gravel gravel deposits ground groundwater hill India indicated joints Kutch length less limestone located Lower major mapped margin material metres million mineral mineralisation minor nature occur pits places Pleistocene portion possible Pradesh present Project proposed quartz quartzite recommended recorded region reported reserves river road rocks samples sandstones Scale schists seams shales Sheets shell shrouding side species specimens strike structure suggested suitable sulphur surface Survey thick trend tubewells tunnel Upper varies veins zone