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    Crushing The OreEarly Gold Mining TechniquesGold . Crushing the Ore The earliest gold mining was done by hand using a hammer and a pick or a gold pan The machine called an arrastre used a giant stone attached to a wooden arm to crush the goldbearing rock Illustration of an arrastre An arrastre was a simple machine This is a picture on the wall

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    After crushing, the ore was chemically treated to tease the gold out mercury was most commonly used for this purpose. One of the most enduring problems of the gold rush mines is the contamination of the soil and water by the mercury, as well as by the acids and arsenic released during the milling process.

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