Economic production of minerals along with production of electric power from geothermal power plants can be termed as cascade use of geothermal power plants. Minerals like silica, lithium, manganese, zinc and sulfur can be removed from geothermal fluid or steam to obtain marketable byproduct; these minerals are also a major source of corrosion and scaling which leads to mechanical failures. Methods of metal extraction developed previously and its importance for power plant to operate efficiently will be discussed here