A method of enriching the molybdenite fraction of ores and concentrates having hydrophobic silicates containing magnesium such as talc. An aqueous slurry of the ore or concentrate is treated with a water soluble metallic salt of a weak base and strong acid and a water soluble salt of a weak acid and subjected to agitation. The treated pulp is then subjected to a conventional froth flotation wherein a molybdenite fraction is floated off as molybdenite enriched concentrate and a talc fraction is depressed into the tailings.
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