See:chamosite
A monoclinic mineral, 2[(Fe2+ ,Mg,Fe3+ )5 Al(Si
3 Al)O10 (OH,O)8 ] ; chlorite group; a constituent of
oolitic iron ores and sedimentary ironstones. Also spelled chamoisite.
The refractory portion of a mixture used in the manufacture of firebrick,
composed of calcined clay or of reground bricks. Standard, 2
A forge for the direct production of wrought iron, generally used in the
United States instead of the Catalan forge, from which it differs in using
only finely crushed ore and in working continuously.
Syn:American forge
a. In coal mining, the opportunity a shot has to break the coal.
Fay
b. The opportunity to put in a shot in a good position. Fay
See:cone classifier
A dense-media process in which coal is separated from refuse in an
artificial dense medium of sand suspended in water. The specific gravity
of this medium is such that the merchantable coal floats while the refuse
sinks to the bottom, the separation being analogous to that of a
float-and-sink separation with a heavy liquidlike zinc chloride. Named
after Thomas M. Chance, U.S. mining engineer. Mitchell
A special building at a mine where workers may wash themselves or change
from street to work clothes and vice versa. Also called changing house;
dry; dryhouse. CF:doghouse
The process of changing tuyeres, plates, monkey, etc., at blast furnaces.
Fay
See:changehouse
Malay. A heavy Chinese hoe with an eye in which the handle fits; used in
cutting soft rock and earth and for stirring gravel in sluice boxes, etc.
Hess
a. A powerful quarrying machine capable of cutting slots in stone at any
angle. It is used for cutting dimension stone off the quarry face without
explosives. See also:broaching
Nelson
b. A machine that cuts a deep groove in rock, ordinarily to free dimension
stone from the mass, or to make a smooth side for a canal or other
excavation in rock. Cutting is accomplished by a group of reciprocating
chisel-pointed bars, operated by steam or compressed air while the machine
carrying them travels back and forth on a track. Ordinarily used only in
the softer rocks, such as limestone, soapstone, or slate. Also called
track channeler; bar channeler. Hess
a. In ion-exchange, fixed-bed work, development of passages in a resin
column through which the liquors flow preferentially so that the resin is
unequally loaded. Pryor, 3
b. In cyanide sand leaching, cracks in the sand bed through which cyanide
solution runs without proper percolating contact with a mass of particles.
Pryor, 3
c. The action of a blast furnace in opening up irregular openings for the
blast.
See:channeler
a. In bituminous coal mining, one who operates a coal-cutting machine to
cut channels (a few inches wide) in coal, after the overlying ground has
been removed, to partly detach coal in blocks so that it may be broken
loose more easily by blasting. Also called channeler-machine operator;
channel-machine operator. DOT
b. In the quarry industry, one who sets up and operates a track-mounted
machine that cuts (drills) vertical channels (a few inches wide) in
quarrystone in which wedges are driven to crack off a block from the mass.
Also called channeler-machine operator; channeler runner; channel-machine
operator; channel-machine runner. DOT
In ore dressing, smelting, and refining, one who installs new channel
irons to form a supporting framework for a continuous anode. DOT
Material from a level groove cut across an ore exposure to obtain a true
cross section of it. Syn:groove sample; strip sample. Pryor, 3
See:trench sampling
A sand or a sandstone deposited in a stream bed, or some other channel
eroded into the underlying rock; it frequently contains oil, gold, or
other valuable minerals.
One of a pair of rails used in a method of temporary rail-track advance at
a tunnel face. The rails comprise a pair of specially made channels with
ramp ends. They fit over the rail section in use and are pushed forward
periodically as a power loader clears the rock ahead. The permanent track
is extended as space becomes available. Nelson
A contour ridge, built of soil moved from its uphill side, that serves to
divert surface water from a field. Nichols, 1