A—STRAKES. B—TANK. C—LAUNDER. D—PLUG. E—WOODEN
SHOVEL.
F—WOODEN MALLET. G—WOODEN SHOVEL WITH SHORT HANDLE. H—THE PLUG
IN THE STRAKE. I—TANK PLACED UNDER THE PLUG.
of the loaded strake with a wooden mallet, in order that the tin-stone clinging
to the sides may fall off; all that has settled in it, he throws out with a
wooden shovel which has a short handle. Silver slags which have been
crushed under the stamps, also fragments of silver-lead alloy and of cakes
melted from pyrites, are washed in a strake of this kind.
F—WOODEN MALLET. G—WOODEN SHOVEL WITH SHORT HANDLE. H—THE PLUG
IN THE STRAKE. I—TANK PLACED UNDER THE PLUG.
of the loaded strake with a wooden mallet, in order that the tin-stone clinging
to the sides may fall off; all that has settled in it, he throws out with a
wooden shovel which has a short handle. Silver slags which have been
crushed under the stamps, also fragments of silver-lead alloy and of cakes
melted from pyrites, are washed in a strake of this kind.
Material of this kind is also washed while wet, in a sieve whose bottom
is made of woven iron wire, and this is the fourth method of washing. The
sieve is immersed in the water which is contained in a tub, and is violently
shaken. The bottom of this tub has an opening of such size that as much
water, together with tailings from the sieve, can flow continuously out of it as
water flows into it. The material which settles in the strake, a boy either
digs over with a three-toothed iron rake or sweeps with a wooden scrubber;
in this way the water carries off a great part of both sand and mud. The
tin-stone or metalliferous concentrates settle in the strake and are afterward
washed in another strake.
is made of woven iron wire, and this is the fourth method of washing. The
sieve is immersed in the water which is contained in a tub, and is violently
shaken. The bottom of this tub has an opening of such size that as much
water, together with tailings from the sieve, can flow continuously out of it as
water flows into it. The material which settles in the strake, a boy either
digs over with a three-toothed iron rake or sweeps with a wooden scrubber;
in this way the water carries off a great part of both sand and mud. The
tin-stone or metalliferous concentrates settle in the strake and are afterward
washed in another strake.
These are ancient methods of washing material which contains
tin
stone; there follow two modern methods. If the tin-stone mixed with
stone; there follow two modern methods. If the tin-stone mixed with