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amount antimony assay bending blast furnace BrCy Broken Hill bullion cent century Chalcopyrite charge coke concentrates containing cooling copper cost country rock crushing cubic yards cupel cwts cyanide cylinder deposits diameter dredge dross dump elevator feet felsitic Freiberg fuel galena gangue glauconite gold grade heat holes hot blast inches iron iron pyrites jigs kettle later lead limestone litharge lodes machine material matte metal metallurgical metasomatic method mill mineral mining Moonta obtained operation oxidation PEAKS SILVER FIELD phenocrysts phosphate pipe plant PLATE Port Pirie practice pressure pulley pump pyrite smelting quantity quartz quartz-felsite regulus removed residues retort roasted Roharbeit rope sand Schlüter shaft siliceous skimmed slag slimes sluice smelters solution STANFORD steam Stope sulphide surface tailings temperature tons treated treatment trommel tuyeres Upper Marine vanners wash wires Yelta Yerranderie zinc