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Societies and Academies

    Naturevolume 85pages3334 (1910) | Download Citation



    LONDON. Institution of Mining and Metallurgy, October 19.—Mr. Edgar Taylor, president, in the chair.—A. J. Bensusan: Notes on passagem mine and works.—R. H. Kendall: Treatment of refractory low-grade gold ores at the Ouro Preto Gold Mine, Brazil. These two papers, which were discussed conjointly, both deal with the same mines from slightly different points of view, so that one may be taken as the complement of the other. The ore treated is composed of quartz, tourmaline, arsenical and iron pyrites, with some bismuth, and the method of high concentration had to be adopted in view of the difficulties and losses encountered with amalgamation in the presence of arsenical pyrites and bismuth. The ore from the mine passes through grizzlies and rock-breakers to two series of Californian stamps, eighty head in all, and thence over blankets. The material remaining on the blankets is piped to passadores for daily concentration, and the concentrate passes through a second passador and thence to bateas, whence the gold dust is recovered, and the tailings return to the passador, and thence with the first passador tailings to the concentrates cyanide plant. The pulp from the mortar boxes passes over Frue vanners, whence the rich concentrates pass to the cyanide plant, and the tailings pass through spitzkasten and thence through the sands and slimes cyanide plants respectively. The papers describe the various processes and the plant in considerable detail, and give statistics as to costs, time of operations, and results.—J. Egerton Wood: A method of collecting gold from pannings. A short note dealing with a simple means of collecting and preserving gold values obtained in the field until such time as they can be be cupelled in the laboratory.

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