Mineral processing

In the field of extractive metallurgy, mineral processing, also known as mineral dressing or ore dressing, is the process of separating commercially valuable minerals from their ores.
Before the advent of heavy machinery the raw ore was broken up using hammers wielded by hand, a process called “spalling”. Before long, mechanical means were found to achieve this. For instance, stamp mills were used in Samarkand as early as 973. They were also in use in medieval Persia. Read More