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amount analyses appears associated average average annual bauxite beds Bengal Bihar Bombay Burma carried cement cent Central Provinces clay coal coke Company compared considerable contain contents continued copper cost countries cwts deposits depth district exports feet field figures five formed furnace gallons Geol given gold Government grade hills imports increase India industry iron iron-ore Italy known lead less lignite limestone Limited lower Madras manganese manganese-ore manufacture material mica miles million mineral mines Mysore Nagpur nearly obtained occur operations Orissa output pegmatites period places plant ports practically present probably production proved Quantity quinquennium railway recorded reported result returns rocks salt sands seams seen Shan shown silica silver South steel stone supply Surv TABLE taken thickness tion tons trade United Upper usually various veins world's yield