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aluminum American amount Antimony Arizona average ball mill barite belt Bolivia Broken Hill cable capacity cassiterite Catavi cent copper charge concentrate Consolidated construction conveyor cost deposits discharge district dredge drift drill electric electrolytic engineer equipment flotation furnace gold grade grizzly haulage headframe hoist holes Idaho increased industry installed iron July June kiln Kirkland Lake lead Llallagua loading London long tons machine Manganese ment mesh metal methods metric tons Mexico miles mill mineral Mining Company months motor Nevada nickel Ontario operation orebody output oxide pany plant pound present production profit pump pyrite pyrrhotite recently Refining result rock salt screens shaft shipments shipped short tons shown in Fig silver smelter Smelting steel stope sulphide sulphur supply surface tailing tion tonnage Tonopah Total tunnel underground United Utah valve veins York zinc