Agricola, Georgius
,
De re metallica
,
1912/1950
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>A—CROSS GROOVES. B—TUB SET UNDER THE SLUICE. C—ANOTHER TUB.
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is to be washed, is thrown into the head and stirred with a wooden scrubber;
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in this way the water carries the light particles of gold on to the canvas,
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and the heavy ones sink in the pockets, and when these hollows are full, the
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head is removed and turned over a tub, and the concentrates are collected
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and washed in a bowl. </
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>Some people make use of a sluice which has square
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pockets with short vertical recesses which hold the particles of gold. </
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>Other
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workers use a sluice made of planks, which are rough by reason of the very
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small shavings which still cling to them; these sluices are used instead of
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those with coverings, of which this sluice is bare, and when the sand is washed,
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the particles of gold cling no less to these shavings than to canvas, or skins, or
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cloths, or turf. </
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>The washer sweeps the sluice upward with a broom, and
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when he has washed as much of the sand as he wishes, he lets a more abundant
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supply of water into the sluice again to wash out the concentrates, which he
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collects in a tub set below the sluice, and then washes again in a bowl. </
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<
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>Just
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as Thuringians cover the sluice with canvas, so some people cover it with
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the skins of oxen or horses. </
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>They push the auriferous sand upward with a
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wooden scrubber, and by this system the light material flows away with the
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water, while the particles of gold settle among the hairs; the skins are
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afterward washed in a tub; and the concentrates are colleced in a bowl.</
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