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In the field of extractive metallurgy, mineral processing, also known as ore dressing, is the . The process of panning and sifting for gold uses both of these methods. . a trough used with some ore dressing machines and the keeve or kieve, .. are typically not used due to their toxicity, difficulties in handling and relative cost.
Mineral processing, art of treating crude ores and mineral products in order to separate . the richest possible concentrate at the lowest possible operating cost. . suitable for machine sampling (slimy ore, for example) or where machinery is either . as in the case of gold and lead, the method has been generally suitable.