Scot. A limekiln in which the process of calcination is carried on
continuously, the raw limestone and fuel being put in at the top and the
lime withdrawn at the bottom. Fay
See:grizzly worker
The condition in which an entry or room is left after all the coal has
been removed. See also:rob
Clay that is shrunk or decreased in volume by burning. Fay
A tube produced by drawing a tube bloom through a die.
Light Metal Age
a. A spot where gravity fed ore from a higher level is loaded into hauling
units. Nichols, 1
b. Heavy chisel cut across the face of a bit blank a short distance from a
diamond to serve as a starting point for calking the metal toward and
around a diamond being handset. Long
A soft slate, shale, or rock approx. 2 in (5.08 cm) to 2 ft (0.61 m) in
thickness, above the coal, and which falls with the coal or soon after the
coal is removed. Fay
In rotary drilling, that part of the equipment functioning as a hoist to
raise or lower drill pipe and in some types, to transmit power to the
rotary table. See also:hoist
a. Large floating machine used in underwater excavation for developing and
maintaining water depths in canals, rivers, and harbors; raising the level
of lowland areas and improving drainage; constructing dams and dikes;
removing overburden from submerged orebodies prior to openpit mining; or
recovering subaqueous deposits having commercial value.
CF:grab sampler
b. See:dradge
c. Very fine mineral matter held in suspension in water.
d. A type of bag net used for investigating the fauna of the sea bottom.
CTD
e. In dry process enameling: (1) the application of dry, powdered frit to
hot ware by sifting; and (2) the sieve used to apply powdered porcelain
enamel frit to the ware. Also called dredging. ASTM
f. Any of various machines equipped with scooping or suction devices used
in deepening harbors and waterways and in underwater mining.
Webster 2nd
The bed of an unnavigable river is open to location and patent as public
land, when the opposite banks thereof have not passed into private
ownership. Proprietors bordering on such streams, unless restricted by the
terms of their grant from the government, hold to the center of the
stream, notwithstanding the running of meander lines on the banks thereof,
as the true boundary of the land is the thread of the stream.
Ricketts
In metal mining, a person who supervises and operates a dredge that is
used to mine metal-bearing sands or gravels (gold, tin, or platinum) at
the bottom of lakes, rivers, and streams. Also called dredgeman.
DOT
A heavy-duty-type centrifuged pump with chrome-carbide or manganese steel
liners. In silts or rounded sand grains their life is often a matter of
months, but where sharp-grained sands or large gravel sizes are being
handled, casing and impeller lives may be figured in hours.
Carson, 2
a. A vessel specially equipped for dredging.
See also:bucket-ladder dredge; dipper dredger; grab dredger;
sand-pump dredger; suction-cutter dredge. CTD
b. Person who dredges. Webster 3rd
c. A dredging machine. Webster 3rd
An excavator working on the same principle as the bucket-ladder dredger
but designed to work on land. CTD
N. of Eng. A small reservoir at the bottom of a shaft, in which the water
collects and deposits any sediments or debris. See also:settling pit
Fay
Removing solid matter from the bottom of an area covered by water.
A scraper partially immersed in a vessel containing liquid used for
removing any solids that may settle therein. BS, 5
A tank, forming part of the water circuit, in which slurry or small coal
settles and is removed continuously by means of a scraper chain or scraper
buckets. Also called drag tank; sludge sump. BS, 5
The large tube of a dredging machine that operates by suction.
Standard, 2
The opening through a dredging vessel in which the bucket ladders work.
See also:bucket-ladder dredge
See:barite