Agricola, Georgius
,
De re metallica
,
1912/1950
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particles of the stones may flow away. </
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>The particles of medium size generally
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settle in the middle part of the buddle, where they are arrested by interwoven
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fir twigs. </
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<
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>The mud which flows down with the water settles between the
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twigs and the board which closes the lower end of the buddle. </
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>The tin-stone
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of large size is removed separately from the buddle with a shovel; those
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of medium size are also removed separately, and likewise the mud is removed
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separately, for they are separately washed on the canvas strakes and on
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the ordinary strake, and separately roasted and smelted. </
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<
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>The tin-stone
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which has settled in the middle part of the buddle, is also always washed
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separately on the canvas strakes; but if the particles are nearly equal in size
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to those which have settled in the upper part of the buddle, they are washed
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with them in the ordinary strake and are roasted and smelted with them.
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>However, the mud is never washed with the others, either on the canvas
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strakes or on the ordinary strake, but separately, and the fine tin-stone which
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is obtained from it is roasted and smelted separately. </
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<
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>The two large buddles
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discharge into a cross trough, and it again empties through a launder into
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a settling-pit which is outside the building.</
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>A—LAUNDER REACHING TO THE SCREEN. B—TRANSVERSE TROUGH. C—SPOUTS.
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D—LARGE BUDDLES. E—SHOVEL. F—INTERWOVEN TWIGS. G—BOARDS CLOSING
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THE BUDDLES. H—CROSS TROUGH.</
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