The enlargement of a blasthole, by exploding a stick of dynamite, so it
will contain a larger amount of explosives for a big blast. Also called a
shake blast. See also:springing
An apparatus that slides under the broken coal and by reciprocating motion
moves the coal along to a discharge point. BCI
The broad tapering shovellike end of a shaking conveyor that is thrust
suddenly under the coal and slowly withdrawn so as to carry the coal that
has been lifted toward the dumping point. Zern
The stirring of an open-hearth bath with a rod to assist in oxidizing and
removal of carbon. Henderson
a. A screen for sizing coal or other material. It consists of a screening
surface of punched plate or wire mesh mounted in a rectangular frame,
supported in a horizontal or slightly inclined position and reciprocated
longitudinally by a crank or eccentric and connecting rod. The slightly
inclined shaking screen is favored. Also called jiggling screen.
See also:trommel; jigging screen; wet screening. Nelson
b. A suspended screen moved with a back-and-forth or rotary motion with a
throw of several inches or more. Nichols, 1
a. In ore dressing, flattish tables oscillated horizontally during
separation of minerals fed onto them. Pryor, 2
b. In concentration of finely crushed ores by gravity, a rectangular deck
with longitudinal riffles. It is shaken rapidly in a compounded to-and-fro
motion by a vibrator, in such a way as to move the sands along, while they
are exposed to the sweeping action of a stream of water flowing across the
deck, which is tilted about its long axis. In dry or pneumatic tabling the
feed is dry, and air is blown upward through a porous deck.
Pryor, 3
c. A slightly inclined table to which a lateral shaking motion is given by
means of a small crank or an eccentric. One form is covered with copper
plates coated with mercury for amalgamating gold or silver; other forms
are provided with riffles and used in separating alluvial gold.
Syn:jerking table; bumping table.
a. A fine-grained detrital sedimentary rock, formed by the consolidation
(esp. by compression) of clay, silt, or mud. It is characterized by finely
laminated structure, which imparts a fissility approx. parallel to the
bedding, along which the rock breaks readily into thin layers, and by an
appreciable content of clay minerals and detrital quartz; a thinly
laminated or fissile claystone, siltstone, or mudstone. It is generally
soft but sufficiently indurated so that it will not fall apart on wetting;
it is less firm than argillite and slate, commonly has a splintery
fracture and a smooth feel, and is easily scratched. Its color may be red,
brown, black, or gray. Etymol: Teutonic, probably Old English scealu,
shell, husk, akin to German schale, shell. AGI
b. One of the impurities associated with coal seams; this term should not
be used as a general term for washery rejects. BS, 5
One who keeps conveyor belt that feeds dry mill constantly loaded with
shale and clay. Also called clay-and-shale feeder; clay feeder; conveyor
loader; shale-and-clay-conveyor man; shale feeder. DOT
See:dirt band
Thin layer or parting of shale between harder strata, primarily a
driller's term. CF:shell
The dust obtained by drying and grinding shale. Rice, 2
A term proposed in place of gasoline for that product distilled from oil
shale. von Bernewitz
Scot. Shale yielding oil on distillation. This term was formerly used as
signifying argillaceous rock.
A crude oil obtained from bituminous shales, esp. in Scotland, by
submitting them to destructive distillation in special retorts.
Fay
A dumping place for coarse material screened out of rotary drill mud.
Nichols, 1
See:shaker
a. A cylindrical sieve or vibrating table that removes the drill cuttings
from the circulating mud stream. Wheeler, R.R.
b. See:shaker
Scot. See:bituminous shale
Aust. Land having gold near its surface. Standard, 2
A shaft sunk to pump surface water only. See also:well
Pertaining to, composed of, or having the character of shale; esp. readily
split along closely spaced bedding planes, such as shaly structure or
shaly parting. Also, said of a fine-grained, thinly laminated sandstone
having the characteristic fissility of shale owing to the presence of thin
layers of shale; or said of a siltstone possessing bedding-plane
fissility. AGI