In the field of extractive metallurgy, mineral processing, also known as ore dressing, is the . For instance, stamp mills were used in Samarkand as early as 973. They were also in use in medieval Persia. By the 11th century, stamp mills were in.
Flotation: Flotation, in mineral processing, method used to separate and . The mineral particles are coated by agitating a pulp of ore, water, and suitable . many otherwise difficult separations that are now common practice in modern mills.