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canvas prints black and white canvas prints working canvas prints engraving canvas prints mineral canvas prints people canvas prints metal industry canvas prints technology canvas prints metal ore canvas prints metal canvas prints hygiene canvas prints vertical canvas prints men canvas prints water canvas prints adult canvas prints 16th century canvas prints

drawings black and white drawings working drawings engraving drawings mineral drawings people drawings metal industry drawings technology drawings metal ore drawings metal drawings hygiene drawings vertical drawings men drawings water drawings adult drawings 16th century drawings

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Washing ore to extract gold, 1683. Water is fed into a sieve containing crushed ore. The solution containing ore in suspension is fed along collecting pans, often lined with dark woollen cloth. Gold, being the heaviest ingredient, is separated out on the way. From a 1683 English edition of Beschreibung allerfurnemisten mineralischen Ertzt by Lazarus Ercker. (Prague, 1574). (Photo by Oxford Science Archive/Print Collector/Getty Images)

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