Metal that can be extracted from a sample by a specified chemical
treatment, ordinarily only part of the metal that is in the sample. Often
abbreviated as "Ex Zn, Ex Cu," etc., indicating the metal of interest. The
process is referred to as partial extraction, or selective extraction.
Syn:readily extractable metal
In solvent extraction, the active organic reagent that forms an
extractable complexion with the metal. Newton, 1
a. The process of mining and removal of coal or ore from a mine.
Nelson
b. Used in relation to all processes of obtaining metals from ores.
Broadly, these processes involve breaking down ore both mechanically
(crushing) and chemically (decomposition), and separating the metal from
the associated gangue. Extractive metallurgy may be conveniently divided
into beneficiation, pyrometallurgy, hydrometallurgy, and
electrometallurgy.
c. A designation for that part of the metallic content of the ore obtained
by a final metallurgical process, e.g., the extraction was 85%.
CF:recovery
d. The process of dissolving and separating out specific constituents of a
sample by treatment with solvents specific for those constituents.
e. In chemical engineering, the operation wherein a liquid or solid
mixture is brought into contact with an immiscible or partially miscible
liquid to achieve a redistribution of solute between the phases.
Process of producing metal from ores or their concentrates.
Pryor, 3
Ratio of the mined volumes to the total volumes. Also called strip ratio.
Obert
The ventilation of a tunnel face (or mine) by an exhaust fan.
See also:exhausting auxiliary fan
Nelson
Superheated water pumped into wells to melt and to extract molten sulfur
from salt domes. Goldman
The extraction of metals from their ores or from the naturally occurring
aggregates of minerals by various mechanical and chemical methods. The
major divisions of extractive metallurgy may be classified as mineral
dressing, pyrometallurgy, hydrometallurgy, and electrometallurgy.
Kirk
The exterior arc of an arch, as in a tunnel. Sandstrom
The fractured ground outside of the fracture zone. In many mines,
extradosal bursts occur more frequently than intradosal; i.e., the
extradosal ground ahead of the working face serves as an abutment that
supports the superincumbent rock to the surface. CF:intradosal
Lewis
Differs from straight dynamite in that a portion of the nitroglycerin
content is replaced with sufficient ammonium nitrate to maintain the grade
strength, manufactured in grade strengths of from 20% to 60%. It is lower
in velocity and water resistance than straight dynamite, but is less
sensitive to shock and friction and less flammable.
See also:ammonia dynamite; low-density explosive. Carson, 1
A rope consisting of 8 strands of 19 wires each with a large hemp center.
Hunt
Unusually dangerous; specif. used in insurance in classifying occupational
risks, as mining is extrahazardous.
Situated or extending beyond the sides; specif. noting the right of a mine
owner to the extension of a lode or vein from his or her claim beyond the
sidelines, but within the vertical planes through the endlines.
Among numerous provisions, the statute (30 USC 26) provides that
extralateral rights to veins, lodes, and ledges that come to an apex
within the boundary lines and dip downward so as to extend outside the
vertical planes through the side lines belong to the owner of such lode
location. The extralateral portion of the vein is that part that extends
on its downward dip through the vertical planes along the side lines.
An explosive mixture consisting of ammonium nitrate and carbonate, liquid
and solid hydrocarbons, and zinc chlorate. Standard, 2
Ash in coal that is derived from inorganic material introduced during
formation of the seam, such as sedimentary particles, or filling cracks in
the coal. See also:ash; ash yield; inherent ash. Syn:secondary ash;
sedimentary ash. AGI
Electrical energy, other than actual firing current or the test current
from a blasting galvanometer, that is present at a blast site and that
could enter an electric blasting circuit; such electricity can include
lightning, current from high tension powerline, and static charge carried
on a person.
Light passing through anisotropic crystals is doubly refracted with one or
both ray directions not parallel to their wave normals. Such light rays do
not follow Snell's law [n=(sin i)/(sin r)] of ordinary refraction and are
termed "extraordinary." Also written E-ray or e-ray.
CF:law of refraction
Projection of a graphic curve beyond the line of points established from
plotting data.
A grade of wire rope used for winding, with a tensile strength of between
115 st/in2 and 125 st/in2 (16.2 t/cm2 and 17.6
t/cm2 ). Mason