Agricola, Georgius, De re metallica, 1912/1950

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              BOOK VIII.
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              <s>Questions of assaying were explained in the last
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              Book, and I have now come to a greater task, that
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              is, to the description of how we extract the metals.
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              <s>First of all I will explain the method of preparing
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              the ore
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              1
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              ; for since Nature usually creates metals
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              in an impure state, mixed with earth, stones, and
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              solidified juices, it is necessary to separate most of
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              these impurities from the ores as far as can be,
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              before they are smelted, and therefore I will now
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              describe the methods by which the ores are sorted, broken with hammers,
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              burnt, crushed with stamps, ground into powder, sifted, washed, roasted,
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              and calcined
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              2
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              .
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