Washing ore to extract gold, 1683. Water is fed into a sieve (2) containing ore. The muddy solution is then fed along wooden collecting troughs, often lined with dark woollen cloth. The gold is separated out on the way. From a 1683 English edition of Lazarus Ercker's Beschreibung allerfurnemisten mineralischen Ertzt of 1580. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)
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January 28th, 2021
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