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abutment alignment alternative appears Assistant associated bands bank belt boreholes carried cent clay coal coal seams coalfield construction contain copper covered deep deposits depth detailed dips district Division dolomite drilling east examined exploration exposed extension fault folded foliation formations foundation further geological geological mapping Geologists gneisses granite hill holes India indicated intruded jointed later length limestone located logged lower major mapped Scale material metres thick metric tons million mineral mineralisation Nagaur Nummulitics occur officers pegmatite phyllites pits places portion possible PRADESH presence Project proposed quartz veins quartzites recommended records regional reported reserves river road rocks samples sandstones Sarvashri schists seams shales shear Sheets southern spillway stones strike suggested suitable Survey thin thrust tion trap trend tunnel types Upper varies veins wide zone