Agricola, Georgius
,
De re metallica
,
1912/1950
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the box; as soon as these compartments are full and the water has begun
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to flow over clear, the little launder through which this water enters into the
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box is closed, and the water is turned in another direction. </
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<
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>Then the
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lowest riffle is removed from the sluice, and the sediment which has
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accumulated flows out with the water and is caught in a bowl. </
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<
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>The
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riffles are removed one by one and the sediment from each is taken into a
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separate bowl, and each is separately washed and cleansed in a bowl. </
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<
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>The
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larger particles of gold concentrates settle in the higher compartments, the
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smaller size, in the lower compartments. </
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>This bowl is shallow and smooth,
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and smeared with oil or some other slippery substance, so that the tiny particles
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of gold may not cling to it, and it is painted black, that the gold may be more
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easily discernible; on the exterior, on both sides and in the middle, it is
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slightly hollowed out in order that it may be grasped and held firmly in the
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hands when shaken. </
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>By this method the particles or concentrates of gold
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settle in the back part of the bowl; for if the back part of the bowl is
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tapped or shaken with one hand, as is usual, the contents move toward the
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fore part. </
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>In this way the Moravians, especially, wash gold ore.</
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>The gold particles are also caught on frames which are either bare or
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covered. </
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>If bare, the particles are caught in pockets; if covered, they </
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>A—PLANK. B—SIDE-BOARDS. C—IRON WIRE. D—HANDLES.</
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