Liquid-liquid extraction of rare earth/uranium/thorium values

A process for the separation and recovery of rare earth, uranium and thorium values from an aqueous solution of the chlorides thereof, said aqueous solution having an acidity of less than 2 N and a concentration in such values, expressed as the oxides thereof, of at least 50 g/l, comprising liquid-liquid extracting said aqueous solution with an organic extractant comprising at least one neutral organophosphorus compound, said at least one neutral organophosphorus compound being a phosphonate, phosphinate, or phosphine oxide when thorium is extracted by said organic extractant, and said at least one neutral organophosphorus compound being a phosphate, phosphonate, phosphinate or phosphine oxide when thorium is to remain in aqueous solution.