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". Before long.
Mineral processing, art of treating crude ores and mineral products in order to . suitable for machine sampling (slimy ore, for example) or where machinery is.
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Oct 7, 2018 . By burning cinnabar ore, the mercury miners of Idrija mined over 13 . largest preserved steam piston machine in Slovenia and probably in Europe. . of transport cable, a blacksmith workshop, and dressing rooms for miners.