Agricola, Georgius
,
De re metallica
,
1912/1950
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346
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plates, because it remains intact, while the rods, when worn by rubbing, can
<
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easily be replaced by others.</
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<
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>Miners use the seventh method of washing when there is no stream of
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water in the part of the mountain which contains the black tin, or particles of
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gold, or of other metals. </
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<
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>In this case they frequently dig more than fifty
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ditches on the slope below, or make the same number of pits, six feet long,
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three feet wide, and three-quarters of a foot deep, not any great distance
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from each other. </
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<
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>At the season when a torrent rises from storms of
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great violence or long duration, and rushes down the mountain, some of
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the miners dig the metalliferous material in the woods with broad hoes and </
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>A—PITS. B—TORRENT. C—SEVEN-PRONGED FORK. D—SHOVEL.
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drag it to the torrent. </
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<
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>Other miners divert the torrent into the ditches or
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pits, and others throw the roots of trees, shrubs, and grass out of the ditches
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or pits with seven-pronged wooden forks. </
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<
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>When the torrent has run down,
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they remove with shovels the uncleansed tin-stone or particles of metal which
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have settled in the ditches or pits, and cleanse it.</
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<
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>The eighth method is also employed in the regions which the Lusitanians
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hold in their power and sway, and is not dissimilar to the last. </
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<
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>They drive </
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