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American amount anodes Antimony Ariz average Broken Hill Canada capacity cent copper Company company's compared concentrate Consolidated conveyor copper cost crusher deposits diabase district drift drilling duction electric electrolytic engineer equipment flotation furnace Geological gold grade grinding high-grade hoist holes Inambari increased industry installed iron Kalgoorlie Kirkland Lake Lake lead London long tons machine magnetic magnetite manganese manufacture material ment mesh metallurgical method Mexico mill mineral Molybdenum months motor Mount Isa Nickel North Ontario operation orebody output oxide pany pipe plant pound present production profit psilomelane pump pyrite recently reduced refinery Refining reported Rhodesia rock sample shaft shipments short tons showed silver smelter Smelting South steam steel stocks stope sulphide sulphur tion tonnage tons daily underground United Utah vanadium vein Western Australia York zinc