Agricola, Georgius
,
De re metallica
,
1912/1950
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the place will permit, extending in every direction more than sixty feet.
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<
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>Thus, when the water of the river or stream in autumn and winter inundates
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the land, the gates of the weir are closed, by which means the current carries
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the mud mixed with fine tin-stone into the area. </
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<
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>In spring and summer
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this mud is washed on the canvas strakes or on the ordinary strake, and
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even the finest black-tin is collected. </
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<
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>Within a distance of four thousand
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fathoms along the bed of the stream or river below the buildings in which
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the tin-stuff is washed, the miners do not make such weirs, but put inclined
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fences in the meadows, and in front of each fence they dig a ditch of the
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same length, so that the mud mixed with the fine tin-stone, carried along by the
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stream or river when in flood, may settle in the ditch and cling to the fence.
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<
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>When this mud is collected, it is likewise washed on canvas strakes and on
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the ordinary strake, in order that the fine tin-stone may be separated from
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it. </
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<
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>Indeed we may see many such areas and fences collecting mud of this
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kind in Meissen below Altenberg in the river Moglitz,—which is always of a
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reddish colour when the rock containing the black tin is being crushed under
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the stamps.</
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<
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>A—RIVER. B—WEIR. C—GATE. D—AREA. E—MEADOW. F—FENCE. G—DITCH.</
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