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ball mill cu zn pb machine in ireland gold ore gold ore

ball mill cu zn pb machine in ireland gold ore gold ore

crushing the ore early gold mining techniques gold. an arrastre was a simple machine, powered by animals or motors, designed to speed up the crushing of quartz ore. the ore was placed in the bottom of the arrastre over which were placed large rocks. the rocks were ground over the ore, crushing it and releasing the gold

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