Agricola, Georgius
,
De re metallica
,
1912/1950
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rudis
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6
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, of yellowish green, yellow, purple, black, or outside red and inside
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gold colour. </
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<
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>These must be reckoned as the richest ores, because the gold
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exceeds the stone or earth in weight. </
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<
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>Next come all gold ores of which each.
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<
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>one hundred
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librae
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contains more than three
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uncĂae
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of gold
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7
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; for although but
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a small proportion of gold is found in the earth or stone, yet it equals in value
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other metals of greater weight.
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8
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All other gold ores are considered poor, because
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