Agricola, Georgius
,
De re metallica
,
1912/1950
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in the bottoms of the sieves, if they contain any metal the miners put them
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under the stamps. </
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<
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>The larger pieces of broken rock are not separated from
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the smaller by this method until the men and boys, with five-toothed rakes,
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have separated them from the rock fragments, the little stones, the
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coarse and the fine sand and earth, which have been thrown on to the dumps.</
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<
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>At Neusohl, in the Carpathians, there are mines where the veins of copper
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lie in the ridges and peaks of the mountains, and in order to save expense
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being incurred by a long and difficult transport, along a rough and sometimes
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very precipitous road, one workman sorts over the dumps which have been
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thrown out from the mines, and another carries in a wheelbarrow the earth,
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fine and coarse sand, little stones, broken rock, and even the poorer ore, and
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overturns the barrow into a long open chute fixed to a steep rock. </
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<
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>This
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chute is held apart by small cleats, and the material slides down a distance of
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about one hundred and fifty feet into a short box, whose bottom is made of a
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thick copper plate, full of holes. </
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<
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>This box has two handles by which it is
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shaken to and fro, and at the top there are two bales made of hazel sticks,
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in which is fixed the iron hook of a rope hung from the branch of a tree or
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from a wooden beam which projects from an upright post. </
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<
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>From time to
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time a sifter pulls this box and thrusts it violently against the tree or post,
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by which means the small particles passing through its holes descend down
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another chute into another short box, in whose bottom there are smaller
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holes. </
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<
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>A second sifter, in like manner, thrusts this box violently against a
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tree or post, and a second time the smaller particles are received into a third
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chute, and slide down into a third box, whose bottom has still smaller holes.
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</
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<
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>A third sifter, in like manner, thrusts this box violently against a tree or post,
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and for the third time the tiny particles fall through the holes upon a table.
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</
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<
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>While the workman is bringing in the barrow, another load which has been
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sorted from the dump, each sifter withdraws the hooks from his bale
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and carries away his own box and overturns it, heaping up the broken rock
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or sand which remains in the bottom of it. </
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<
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>As for the tiny particles which
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have slid down upon the table, the first washer—for there are as many
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washers as sifters—sweeps them off and in a tub nearly full of water, washes
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them through a sieve whose holes are smaller than the holes of the third box.
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<
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>When this tub has been filled with the material which has passed through
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the sieve, he draws out the plug to let the water run away; then he removes
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with a shovel that which has settled in the tub and throws it upon the table
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of a second washer, who washes it in a sieve with smaller holes. </
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<
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>The sedi
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ment which has this time settled in his tub, he takes out and throws on the
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table of a third washer, who washes it in a sieve with the smallest holes.
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</
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<
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>The copper concentrates which have settled in the last tub are taken out and
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smelted; the sediment which each washer has removed with a limp is
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washed on a canvas strake. </
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<
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>The sifters at Altenberg, in the tin mines of
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the mountains bordering on Bohemia, use such boxes as I have described,
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hung from wooden beams. </
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<
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>These, however, are a little larger and open in
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the front, through which opening the broken rock which has not gone through
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the sieve can be shaken out immediately by thrusting the sieve against its post.</
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