Agricola, Georgius
,
De re metallica
,
1912/1950
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[Figure 311]
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[Figure 312]
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198
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>A—SIEVE. B—TUB. C—WATER FLOWING OUT OF THE BOTTOM OF IT. D—STRAKE.
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E—THREE-TOOTHED RAKE. F—WOODEN SCRUBBER.
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earth or sand is found on the slopes of mountains or hills, or in the level fields
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which are either devoid of streams or into which a stream cannot be diverted,
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miners have lately begun to employ the following method of washing, even
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in the winter months. </
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>An open box is constructed of planks, about six
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feet long, three feet wide, and two feet and one palm deep. </
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>At the upper
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end on the inside, an iron plate three feet long and wide is fixed, at a depth
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of one foot and a half from the top; this plate is very full of holes, through
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which tin-stone about the size of a pea can fall. </
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>A trough hewn from a tree
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is placed under the box, and this trough is about twenty-four feet long and
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three-quarters of a foot wide and deep; very often three cross-boards are
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placed in it, dividing it off into compartments, each one of which is lower
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than the next. </
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>The turbid waters discharge into a settling-pit.</
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>The metalliferous material is sometimes found not very deep beneath
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the surface of the earth, but sometimes so deep that it is necessary to drive
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tunnels and sink shafts. </
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>It is transported to the washing-box in wheel
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barrows, and when the washers are about to begin they lay a small launder, </
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