The froth flotation process is a selective process and can be used to achieve specific separations from complex ores such as lead-zinc and copper-zinc. Flotation is a physico-chemical separation process that utilises the difference in surface properties of the valuable minerals and gangue minerals. The theory of froth flotation is involving three phases such as solids, water and froth with many sub-processes and interactions. Initially developed to treat the sulphides of copper, lead, and zinc. However the field of flotation has expended to include platinum, nickel and gold hosting sulphides and oxides such as hematite and cassiterite, oxidised minerals such as malachite and cerussite and non-metallic ores such as fluorite, phosphates and fine coal.