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Electrolytic Oxygen in Cyanide Solutions. T.H. ALDRICH, JR. (Amer. Inst. Mining Eng., Bull. lxii, p. I77.)--Experiments made in the laboratory and on the manufacturing scale with 25,000 tons of ore in the factory prove that the extraction of gold and silver is much more complete, especially when sulphides, graphite, grease, and other reducing agents are present, and that much cyanide is saved, when the cyanide is electrolyzed by continuous or alternating currents, with lead electrodes on IiO volt circuits. Eighteen lead plates, ~ inch thick, 6 inches square, connected in series, have been in continuous service for over two years. Lead electrodes are more serviceable than those of iron or carbon.
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