a. Coal from which impurities have been removed by any form of mechanical
treatment. BS, 4
b. Coal produced by a wet-cleaning process. BS, 5
Said of a coal seam when the bed thins out. Mason
a. A place at which ore, coal, or crushed stone is freed from impurities
or dust by washing. Also called wet separation plant; washing plant.
See also:washing apparatus; wash place; coal-preparation plant;
dense-medium washer; efficiency of separation. Webster 3rd
b. A coal preparation plant in which a cleaning process is carried out by
wet methods. BS, 5
c. A building resembling a breaker used in reclaiming culm and fine coal
from old banks. Korson
Surplus water discharged from a washery, usually to waste (after
settlement of solids in suspension). BS, 5
The final products from a washery. BS, 5
A pump generally of simple construction and heavy design since slurry
presents a difficult pumping problem owing to its erosive action. This
type pump is generally of the single-stage type as heads are small, with a
solid casing of steel or cast iron about twice the normal thickness to
provide against erosive action. Sinclair, 4
The refuse removed at preparation plants from newly mined coal.
The water used in the wet separation of coal from shale by differences in
density. See also:recirculation of water
See:placer gold
Gravel washed to extract gold. CF:wash dirt
A building on the surface at a mine where the miners can wash before going
to their homes. A changehouse. A dryhouse.
a. That which is retained after being washed; as, a washing of ore.
b. The selective sorting, and removal, of fine-grained sediment by water
currents. AGI
c. Erosion or wearing-away by the action of waves or running water.
AGI
d. The act or process of cleaning, carrying away, or eroding by the
buoyant action of flowing water. Long
e. Ore mineral, such as gold dust, that is retained after being washed.
a. Machinery and appliances erected on the surface at a coal mine, for
extracting, by washing with water, the impurities mixed with the coal dust
or small slack. Zern
b. Machinery for removing impurities from coals and ores.
See also:washery
See:trommel
See:hutch
Scot. A machine for separating impurities from coal by means of water.
Fay
See:washery
Flat screen or trommel on which passing ore is exposed to sprays or jets
of water to remove as undersize any adherent mud or other fine material.
Pryor, 3
Devices in which continuous helical blades arranged about shafts force the
material up an inclined trough against a stream of water introduced at the
higher end. This action carries away the soluble material occurring with
the material and dumps the washed product over the higher end of the
trough. Pit and Quarry
An earthy deposit containing gold that may be extracted by washing.
See also:wash dirt
See:trommel