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This work of Professors Clark Peres and Correa de Araújo is a mostvaluable one as a guidingpaper injlotation practice in Brazil and should be very much welcomed by the mineral-metallurgical professionals.

The following types of ores are (or were until a very recent date) processed with the use froth flotation in Brazil: iron, phosphate, niobium, gold, copper, oxidized zinc, lead-zinc,