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analysis anomaly associated bands base basin belt block boreholes Calcutta carried chemical Circle clay coal collected completed comprising construction continued core covered deposits depth detailed developed dips Director district Division Divn drilling east ENGINEERING exploration exposed extension field flows folds Formation foundation geological geological mapping Geologist geophysical gneiss grade granite Group Headquarters holes indicated investigation Laboratory length lignite limestone located logging Lower magnetic major material mineral mineralisation Nagpur observed occurs pegmatites phyllite Pradesh present Project proposed quartz quartzite range recorded Regional represented revealed river rocks S/Shri samples sand sandstone scale schist seams sediments sericite shale shear sheets Shri soil sq km stage strike structure studies suggested surface surveys thickness tion traverses trench trending tunnel types units Upper values various varying veins West zone