In the field of extractive metallurgy, mineral processing, also known as ore dressing, is the , For instance, stamp mills were used in Samarkand as early as 973 , The process of panning and sifting for gold uses both of these methods , Later, more advanced machines were used such as the Frue vanner, invented in .
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When washed in water, gold, silver sulphurets, and rock particles that contain them, , Despite differences in detail and heralded improvements, milling machines were , thus making the process of concentration continuous and automatic.
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