In flotation, a delay attributable to the transport of material or the
finite rate of propagation of a signal or condition. Syn:velocity lag
Fuerstenau
A mineral overgrowth not in crystallographic continuity with its core or
nucleus. CF:epitaxy; syntaxy.
A former name for kyanite.
A metamorphic rock composed almost entirely of kyanite (disthene) and some
quartz, often associated with magnetiferous quartzite and amphibolite.
AGI
a. The process of decomposition whereby the original chitinous material of
certain fossils has lost its nitrogen, oxygen, and hydrogen, and is now
represented by a film of carbonaceous material. Syn. for carbonization.
AGI
b. The process of heating a substance to the temperature at which it is
converted to a vapor, then cooling the vapor, and thus restoring it to the
liquid state. See also:destructive distillation;
fractional distillation. Shell
c. A process of evaporation and recondensation used for separating liquids
into various fractions according to their boiling points or boiling
ranges. CTD
A reverberatory heating furnace in which the charge is contained in a
closed vessel and does not come in contact with the flame. Fay
See:varietal mineral
A crystal whose faces have developed unequally, some being larger than
others. Some distorted crystal forms are drawn out or shortened, but the
angle between the faces remains the same. See also:deformed crystal
a. The change in shape and size of a land area on a map due to the
flattening of the curved Earth surface to fit a plane. Distortion is
inevitable and is controlled in the development of a projection to produce
the characteristics of equal area, conformality, or equidistance.
AGI
b. Any shift in the position of an image on a photograph that alters the
perspective characteristics of the photograph. It may be caused by lens
aberration, differential shrinkage of film or paper, or motion of the film
or camera. CF:displacement
See:shear wave; S wave; transverse wave; secondary wave.
A place or building, either near the mine entrance or underground, in
which explosives are stored for current use. Only one day's supply should
be kept at such points. The main supply of explosives is kept in a
magazine generally a safe distance from the mine or any mine buildings.
Kentucky
See:partition curve; Tromp distribution curve.
See:partition factor
See:step fault
The environment embracing all rocks that contribute to the formation of a
contemporaneous sedimentary deposit, including the agents responsible for
their distribution. CF:provenance
Box that receives feed from launder, pipe, or pump and splits it into
parallel mill circuits. Box attached to deck of shaking table, which
receives sands and distributes them along top of deck at feed end.
Pryor, 3
a. In the States and Territories of the United States west of the Missouri
River (prior to 1880), a vaguely bounded and temporary division and
organization made by the inhabitants of a mining region.
b. A limited area of underground workings. Nelson
c. A coal mine is generally divided into sections or districts for
purposes of ventilation and daily supervision. Nelson
d. An underground section of a coal mine served by its own roads and
ventilation ways; a section of a coal mine. CTD
A term used by some geologists for a minor orogeny, e.g., the Palisades
disturbance. Schuchert (1924) used revolution for a major orogeny at the
end of an era, and disturbance for an orogeny within an era; this usage is
obsolete. AGI
An area where vegatation, topsoil, or overburden is removed or upon which
topsoil, spoil, coal processing waste, underground development waste, or
noncoal waste is placed by surface coal mining operations. Those areas are
classified as disturbed until reclamation is complete and the performance
bond or other assurance of performance is released.
Workings that are no longer in operation but that are not classified as
abandoned. BS, 7
a. A drainage course in a mine. BCI
b. An artificial channel to convey water for use in mining. CF:flume
c. The drainage gutter along gangways and openings in anthracite mines.
d. In rotary drilling, a trough carrying mud to a screen.
Nichols, 1
e. The artificial course or trough in which the drill circulation fluid is
conducted from the collar of the borehole to the sump. To dump and discard
contents of a bailer, without taking a sample, into a ditch leading away
from the collar of a borehole. Syn:canal; chute; ditch. CF:trench
Long