Agricola, Georgius
,
De re metallica
,
1912/1950
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BOOK VIII.
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<
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>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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<
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>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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