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analysis Assistant associated attended bands bank base belt block boreholes carried Central chemical CIRCLE clay coal Coalfield collected completed connection construction continued cores covered deposits depth detailed Director District DIVISION drilling East Engineer estimated examined exploration exposed fault field flows Formation foundation geological mapping Geologist Jr Geologist Sr geophysical Ghosh gneiss grade granite Group Headquarters held holes included India indicated investigation Laboratory length limestone located logged Lower major measures meeting Mineral mineralisation Nagpur observed occur officers pitting PRADESH prepared present processed Project proposed quartz quartzite Rajasthan recommended Region reported river rock S/Shri samples sandstone scale Scheme schist Sector sediments seismic refraction shales shear Shri spillway sq km stage strike structure studies suggested surface surveys thickness tion tonnes traverse trending tunnel types units Upper upto valley varying veins West zone