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quartz chips silver ball mill

quartz chips silver ball mill

In modern times,ball millsare used. This article principally discusses the arastra, the oldestrock crusherthat had general use. The arastra is the simplest instrument forgrinding auriferous quartz. It is a circular bed of stone, from eight to twenty feet in diameter, on which thequartzis ground by a large stone dragged round and round by horse or mule-power.

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