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Copper Lead and Zinc by P K Banerjee
Gold by S Narayanaswami and M Ziauddin 4150
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alteration appears associated average bands base basins bauxite belt Bihar Block bodies carried cement chromite coal coalfields colour containing copper deposits depth detailed disseminations district dolomite drilling east eastern estimated exploration extending fault fields flux grade folds followed formation further G.S.I. report Geol geological gold grade grained granite grey hill horizon important India indicated inferred intrusives iron iron-ore known laterite lignite limestone located lodes Lower Madhya Pradesh major manganese massive metal metres million tonnes mineralisation minerals mines minor Mysore Nagpur occur orebodies origin phosphate phosphorite phyllites places Pradesh present proved pyrite quartz quartzite Rajasthan range recent region reserves result rocks samples schist seams sericite shales shear similar strike length structure sulphide surface thickness thin types ultramafic ultramafites Upper upto varies veins western zone