Ore Refuse, also known as SLAG, is a by-product of the smelting process used to extract metals from ore. SLAG is composed of the non-metallic components of the ore that are separated from the metal during the smelting process. It is usually a mixture of silicates, oxides, and other materials that are not suitable for use in the production of metals. SLAG can be used as an aggregate in construction projects or as a fertilizer in agricultural applications.