In the field of extractive metallurgy, mineral processing, also known as ore dressing, is the . Before the advent of heavy machinery the raw ore was broken up using hammers wielded by hand, a process called "spalling". .. Multi G processes allow the separation of very fine particles to occur (in the range of 5 to 50 micron).
Mineral processing, art of treating crude ores and mineral products in order to . not suitable for machine sampling (slimy ore, for example) or where machinery is .. With good results, strongly magnetic minerals such as magnetite, franklinite,.