1concentrates are washed separately in different bowls
from those which have
settled on the canvas. This bowl is smooth and two digits wide and deep,
being in shape very similar to a small boat; it is broad in the fore part,
narrow in the back, and in the middle of it there is a cross groove, in which
the particles of pure gold or silver settle, while the grains of sand, since they
are lighter, flow out of it.
settled on the canvas. This bowl is smooth and two digits wide and deep,
being in shape very similar to a small boat; it is broad in the fore part,
narrow in the back, and in the middle of it there is a cross groove, in which
the particles of pure gold or silver settle, while the grains of sand, since they
are lighter, flow out of it.
In some parts of Moravia, gold ore, which consists of quartz mixed with
gold, is placed under the stamps and crushed wet. When crushed fine it
flows out through a launder into a trough, is there stirred by a wooden
scrubber, and the minute particles of gold which settle in the upper end of
the trough are washed in a black bowl.
gold, is placed under the stamps and crushed wet. When crushed fine it
flows out through a launder into a trough, is there stirred by a wooden
scrubber, and the minute particles of gold which settle in the upper end of
the trough are washed in a black bowl.
A—STAMPS. B—MORTAR. C—PLATES FULL OF HOLES.
D—TRANSVERSE LAUNDER.
E—PLANKS FULL OF CUP-LIKE DEPRESSIONS. F—SPOUT. G—BOWL INTO WHICH THE
CONCENTRATES FALL. H—CANVAS STRAKE. I—BOWLS SHAPED LIKE A SMALL BOAT.
K—SETTLING-PIT UNDER THE CANVAS STRAKE.
E—PLANKS FULL OF CUP-LIKE DEPRESSIONS. F—SPOUT. G—BOWL INTO WHICH THE
CONCENTRATES FALL. H—CANVAS STRAKE. I—BOWLS SHAPED LIKE A SMALL BOAT.
K—SETTLING-PIT UNDER THE CANVAS STRAKE.
So far I have spoken of machines which crush wet ore with iron-shod
stamps. I will now explain the methods of washing which are in a measure
peculiar to the ore of certain metals, beginning with gold. The ore which
contains particles of this metal, and the sand of streams and rivers which
stamps. I will now explain the methods of washing which are in a measure
peculiar to the ore of certain metals, beginning with gold. The ore which
contains particles of this metal, and the sand of streams and rivers which