Any winding or hauling rope from which the load upon it has been removed.
Fay
A track for storing empty mine cars. Fay
Applies to empty coal, ore, and waste cars returning for another load.
Fay
The condensation of dust and fumes from calcining furnaces by use of large
flues filled with parallel rows of sheet iron. Fay
The phenomenon of holding finely divided particles of a liquid in
suspension within the body of another liquid. Banka method. Shell
a. See:mud mixer
b. A saponifying or other agent added to water and oil or water and
resins, causing them to form an emulsion. Long
a. A liquid mixture in which a fatty or resinous substance is suspended in
minute particles almost equivalent to molecular dispersion. Fay
b. A suspension of one finely divided liquid phase in another.
ASM, 1
An ore texture showing minute blebs or rounded inclusions of one mineral
irregularly distributed in another. AGI
Having crystal forms that, while possessing neither a plane nor a center
of symmetry, may occur in two positions that are mirror images of one
another. The two positions cannot be converted into each other by any
rotation, but are related to each other as are the right and left hand,
hence designated right- and left-handed forms. Enantiomorphous crystals
cause circular polarization of light, e.g., quartz.
In crystallography, similar in form but not superposable related to each
other as the right hand is to the left, hence, one the mirror image of the
other. AGI
An orthorhombic mineral, Cu3 AsS4 ; dimorphous with
luzonite, metallic gray-black; in vein and replacement copper deposits as
small crystals or granular masses; an important ore of copper and arsenic;
may contain up to 7% antimony; localities include Butte, MT; Chuquicamata,
Chile; Cerro de Pasco, Colquijirca, Peru; Tsumeb, Namibia; and Bor,
Serbia.
Cut in a style characterized by a smooth-domed, but unfaceted, surface;
e.g., a ruby cut en cabochon in order to bring out the star. Etymol:
French. See also:cabochon
for those gems that depend for their beauty largely upon minute oriented
inclusions (e.g., crocidolite, star ruby, or sapphire), the plan of the
stone being circular or oval.
a. To work coal or mineral beyond the boundary that divides one mine area
from another; to work coal from a barrier pillar that has been left as a
safety measure. Also called trespass. Nelson
b. The advancement of water, replacing withdrawn oil or gas in a
reservoir. AGI
a. A crust or coating of minerals formed on a rock surface; e.g., calcite
on cave objects, soluble salts on a playa, or manganese-rich crusts on the
ocean or lake floor. AGI
b. The process by which a crust or coating is formed. Syn:incrustation
AGI
a. The secondary cleavage more or less at right angles to the bord or face
cleat.
b. A direction parallel to the main natural line of cleat or cleavage in
coal. Also called end line. TIME
c. Solid rock face at the termination of a tunnel. Pryor, 3
A mechanically operated, sloping table by which heavy and light materials
are separated. The end motion imparted to the table tends to drive all
minerals up the slope of the table, but a flow of water carries the light
materials down faster than the mechanical motion carries them up. The
heavy materials settle to the bottom and finally reach the upper end and
are delivered into a proper receptacle. The Gilpin County, Imlay, and
Golden Gate concentrators are the chief types. Syn:Imlay table
Liddell
See:butt cleat
A clinometer designed to be fitted only to the bottom end of a drillrod
string, as contrasted with a line clinometer that can be coupled into the
drillrod string at any point between two rods. Long
A framework to discharge the coal or mineral from a mine car or a wagon by
elevating the rear end and to deliver the load from its front end onto a
screen, chute, or bunker below track level. Nelson
See:mine car
Process in which earth is pushed over the edge of a deep fill and allowed
to roll down the slope. Carson, 1