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". 9th International conference on coal science (ICCS'97), 712 September 1997, Essen, Germany.
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Mineral processing, art of treating crude ores and mineral products in order to separate . For these sampling machines to provide an accurate representation of the . for which various national and international standards have been accepted.