Why is froth floatation process used to extract SULPHIDES????? y sulphides!??!!

This method is based on the principle of the difference in the wetting properties of the ore and the gangue particles with the water and oil.

This method is used for that metals whose ore gets preferably wetted by the oil and the gangue by the water. The sulphide ores preferably wetted by the oil and the gangue with the water. Hence this method is suitable for the concentration of the sulphide ore.