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AIRBORNE MINERAL SURVEYS AND EXPLORATION WING
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analysis anomaly associated bands basalt base basin belt block boreholes carried clay coal collected completed comprising construction continued core covered deposits depth detailed developed dips Director district Division drilling east exploration exposed extending fault field flows folds Formation foundation Garhwal geological geological mapping geophysical gneiss grade granite grey Group Headquarters holes indicated intrusive investigation Laboratory length lignite limestone located logging Lower magnetic major material measures mineral mineralisation Nagpur observed occurs pegmatites phyllite places power house Pradesh present Project proposed quartz quartzite range recorded regional represented revealed river rocks samples sand sandstone scale scheme schist seams sediments sequence sericite shale shear sheets Shri soil sq km stage strike structure studies suggested surface surveys thickness tion traverses trending tunnel types units Upper valley values various varying veins West zone