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a great number of deep ditches in rows in the gullies, slopes, and hollows of
the mountains. Into these ditches the water, whether flowing down from
snow melted by the heat of the sun or from rain, collects and carries together
with earth and sand, sometimes tin-stone, or, in the case of the Lusitanians,
the particles of gold loosened from veins and stringers. As soon as the
waters of the torrent have all run away, the miners throw the material out
of the ditches with iron shovels, and wash it in a common sluice box.
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The Poles wash the impure lead from venae dilatatae in a trough ten
feet long, three feet wide, and one and one-quarter feet deep. It is mixed
with moist earth and is covered by a wet and sandy clay, and so
first of all the clay, and afterward the ore, is dug out. The ore is carried
to a stream or river, and thrown into a trough into which water is admitted
by a little launder, and the washer standing at the lower end of the trough
drags the ore out with a narrow and nearly pointed hoe, whose wooden handle
is nearly ten feet long. It is washed over again once or twice in the same
way and thus made pure. Afterward when it has been dried in the sun
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