1in the bottoms of the sieves, if
they contain any metal the miners put them
under the stamps. The larger pieces of broken rock are not separated from
the smaller by this method until the men and boys, with five-toothed rakes,
have separated them from the rock fragments, the little stones, the
coarse and the fine sand and earth, which have been thrown on to the dumps.
under the stamps. The larger pieces of broken rock are not separated from
the smaller by this method until the men and boys, with five-toothed rakes,
have separated them from the rock fragments, the little stones, the
coarse and the fine sand and earth, which have been thrown on to the dumps.
At Neusohl, in the Carpathians, there are mines where the veins of copper
lie in the ridges and peaks of the mountains, and in order to save expense
being incurred by a long and difficult transport, along a rough and sometimes
very precipitous road, one workman sorts over the dumps which have been
thrown out from the mines, and another carries in a wheelbarrow the earth,
fine and coarse sand, little stones, broken rock, and even the poorer ore, and
overturns the barrow into a long open chute fixed to a steep rock. This
chute is held apart by small cleats, and the material slides down a distance of
about one hundred and fifty feet into a short box, whose bottom is made of a
thick copper plate, full of holes. This box has two handles by which it is
shaken to and fro, and at the top there are two bales made of hazel sticks,
in which is fixed the iron hook of a rope hung from the branch of a tree or
from a wooden beam which projects from an upright post. From time to
time a sifter pulls this box and thrusts it violently against the tree or post,
by which means the small particles passing through its holes descend down
another chute into another short box, in whose bottom there are smaller
holes. A second sifter, in like manner, thrusts this box violently against a
tree or post, and a second time the smaller particles are received into a third
chute, and slide down into a third box, whose bottom has still smaller holes.
A third sifter, in like manner, thrusts this box violently against a tree or post,
and for the third time the tiny particles fall through the holes upon a table.
While the workman is bringing in the barrow, another load which has been
sorted from the dump, each sifter withdraws the hooks from his bale
and carries away his own box and overturns it, heaping up the broken rock
or sand which remains in the bottom of it. As for the tiny particles which
have slid down upon the table, the first washer—for there are as many
washers as sifters—sweeps them off and in a tub nearly full of water, washes
them through a sieve whose holes are smaller than the holes of the third box.
When this tub has been filled with the material which has passed through
the sieve, he draws out the plug to let the water run away; then he removes
with a shovel that which has settled in the tub and throws it upon the table
of a second washer, who washes it in a sieve with smaller holes. The sedi
ment which has this time settled in his tub, he takes out and throws on the
table of a third washer, who washes it in a sieve with the smallest holes.
The copper concentrates which have settled in the last tub are taken out and
smelted; the sediment which each washer has removed with a limp is
washed on a canvas strake. The sifters at Altenberg, in the tin mines of
the mountains bordering on Bohemia, use such boxes as I have described,
hung from wooden beams. These, however, are a little larger and open in
the front, through which opening the broken rock which has not gone through
the sieve can be shaken out immediately by thrusting the sieve against its post.
lie in the ridges and peaks of the mountains, and in order to save expense
being incurred by a long and difficult transport, along a rough and sometimes
very precipitous road, one workman sorts over the dumps which have been
thrown out from the mines, and another carries in a wheelbarrow the earth,
fine and coarse sand, little stones, broken rock, and even the poorer ore, and
overturns the barrow into a long open chute fixed to a steep rock. This
chute is held apart by small cleats, and the material slides down a distance of
about one hundred and fifty feet into a short box, whose bottom is made of a
thick copper plate, full of holes. This box has two handles by which it is
shaken to and fro, and at the top there are two bales made of hazel sticks,
in which is fixed the iron hook of a rope hung from the branch of a tree or
from a wooden beam which projects from an upright post. From time to
time a sifter pulls this box and thrusts it violently against the tree or post,
by which means the small particles passing through its holes descend down
another chute into another short box, in whose bottom there are smaller
holes. A second sifter, in like manner, thrusts this box violently against a
tree or post, and a second time the smaller particles are received into a third
chute, and slide down into a third box, whose bottom has still smaller holes.
A third sifter, in like manner, thrusts this box violently against a tree or post,
and for the third time the tiny particles fall through the holes upon a table.
While the workman is bringing in the barrow, another load which has been
sorted from the dump, each sifter withdraws the hooks from his bale
and carries away his own box and overturns it, heaping up the broken rock
or sand which remains in the bottom of it. As for the tiny particles which
have slid down upon the table, the first washer—for there are as many
washers as sifters—sweeps them off and in a tub nearly full of water, washes
them through a sieve whose holes are smaller than the holes of the third box.
When this tub has been filled with the material which has passed through
the sieve, he draws out the plug to let the water run away; then he removes
with a shovel that which has settled in the tub and throws it upon the table
of a second washer, who washes it in a sieve with smaller holes. The sedi
ment which has this time settled in his tub, he takes out and throws on the
table of a third washer, who washes it in a sieve with the smallest holes.
The copper concentrates which have settled in the last tub are taken out and
smelted; the sediment which each washer has removed with a limp is
washed on a canvas strake. The sifters at Altenberg, in the tin mines of
the mountains bordering on Bohemia, use such boxes as I have described,
hung from wooden beams. These, however, are a little larger and open in
the front, through which opening the broken rock which has not gone through
the sieve can be shaken out immediately by thrusting the sieve against its post.
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