Agricola, Georgius
,
De re metallica
,
1912/1950
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<
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>A—LONG TABLE. B—TRAY. C—TUB.</
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<
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>I will start at the beginning with the first sort of work. </
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>Experienced
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miners, when they dig the ore, sort the metalliferous material from earth,
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stones, and solidified juices before it is taken from the shafts and tunnels,
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and they put the valuable metal in trays and the waste into buckets. </
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<
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>But
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if some miner who is inexperienced in mining matters has omitted to do this,
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or even if some experienced miner, compelled by some unavoidable necessity,
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has been unable to do so, as soon as the material which has been dug out
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has been removed from the mine, all of it should be examined, and that part of
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the ore which is rich in metal sorted from that part of it which is devoid of
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metal, whether such part be earth, or solidified juices, or stones. </
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<
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>To smelt
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waste together with an ore involves a loss, for some expenditure is thrown
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away, seeing that out of earth and stones only empty and useless slags are </
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