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alloys annual asbestos average blasting British Columbia Canada Canadian capacity cent Chibougamau coal company's concentrates copper cost Department of Mines deposits diamond drilling duction economic electric engineer equipment estimated exploration exports feet field Flin Flon flotation geological Gold Mines grade hoist holes increase iron Kirkland Lake Lake area lead loading long tons magnetic magnetite manager Manitoba material ment metal metallurgical methods miles mill million tons mineral Mines Limited Mines Ltd mining industry molybdenum months Montreal nepheline nepheline syenite nickel Noranda Ontario operation ounces output oxide pany paper plans plant Port pound production prospecting prospectors province pyrrhotite Quebec refined rock Saskatchewan shaft shipments short tons silver smelter Smelting steel sulphide supply survey thorium tion tonnage Toronto underground United uranium Vancouver Wabush zinc zone