Abstract: The disclosed invention concerns a process comprising: (a) providing a pregnant leach solution comprising copper values; (b) contacting the pregnant leach solution with an organic phase comprising a copper extractant at an extraction temperature, Text, to form a loaded organic phase comprising the metal values; (c) contacting the loaded organic phase with an aqueous stripping solution at a stripping temperature, Tstrip, to form a copper-enriched stripping solution; wherein the difference in temperature (?T) between the stripping temperature and the extraction temperature according to equation (I): ?T=Tstrip?Text is less than or equal to about 10° C. In other increasingly more preferred embodiments of the invention, the difference in temperature (?T) is less than or equal to about 5° C., less than or equal to about 2.5° C., less than or equal to about 0° C., less than or equal to about ?5° C., and less than or equal to about ?10° C.

Abstract: Process for removing manganese values from a solution of a water-immiscible hydrocarbon containing manganese values and a water-insoluble oxime extractant capable of extracting nickel values from aqueous ammoniacal solutions comprising the steps ofI) contacting the water-immiscible hydrocarbon solution with a finely divided active metal and an aqueous solution of a strong acid to decrease or complete remove the manganese values from said water-immiscible hydrocarbon solution; andII) separating the stripped hydrocarbon solution from the aqueous solution.The invention also relates to a method for the extraction of nickel from nickel-containing ores in which a content of manganese values is present in which the above process is used.