Former name for pyrargyrite.
a. A suspension of ultramicroscopic solid or liquid particles in air or
gas, as smoke, fog, or mist. Webster 3rd
b. Particles, solid or liquid, suspended in air. ANSI
c. A sol in which the dispersion medium is a gas (usually air) and the
dispersed or colloidal phase consists of solid particles or liquid
droplets, e.g., mist, haze, most smoke, and some fog. AGI
Trade name of strong wetting agent based on sulfonated bi-carboxy-acid
esters. Pryor, 3
A grass-green to brown nickel arsenate, perhaps Ni17 As6 O
32 ; an analysis gave 48.77% nickel. It is an oxidized vein mineral.
Hess
a. Copper carbonate, due to weathering of the metal; esp., the patina
adhering to old bronzes. Hess
b. Copper rust; verdigris; esp., green copper rust adhering to old
bronzes. Standard, 2
An orthorhombic mineral, (Ce,Ca,Fe,Th)(Ti,Nb)2 (O,OH)6 ;
radioactive; occurs in black sands and pegmatites.
A former name for metacinnabar; isometric HgS .
a. A nodule consisting of a hard shell of hydrated iron oxide within which
yellow iron oxide becomes progressively softer toward the center, which
may be hollow. Fay
b. See:eaglestone
In ion exchange, relative strength of attachment of competing ions for
anchorage on a resin. Pryor, 3
a. Two poles or legs supported in an upright position by braces or guys
and used as a drill mast. Long
b. An open structure tapering from a wide base to a narrow load-bearing
top. Nichols, 2
A steel headgear consisting of two heavy plate A-frames, set astride the
shaft mouth. They are braced together and carry the heavy girders that
support the winding sheaves platform. It is a completely self-supporting
and rigid structure that leaves usable space around the shaft collar and
includes a guide-tower structure built over the shaft collar. A number of
these headgears have been erected in the Republic of South Africa.
Nelson
a. A deceiving name for green fluor; also for green tourmaline.
b. An emerald from the Transvaal. It is usually quite yellowish green;
often dark and dull. Hardness, 7.5; sp gr, 2.72 to 2.79; refractive index,
1.58 to 1.59; birefringence, 0.007. Syn:Transvaal emerald
c. A term variously used for southern African emeralds (beryl), green
tourmaline, and other green gemstones from this region.
During an explosion of methane and oxygen, carbon dioxide and steam are
formed. When the steam condenses to water a partial vacuum is created,
which causes an inrush or what is known as an afterblast. Cooper
Continued blowing of air through Bessemer converter after flame has
dropped, for removal of phosphorus in steel production. Pryor, 3
In mine subsidence, a movement from the sides, the material sliding
inward, and following the main break, assumed to be at right angles to the
plane of the seam. The amount of this movement depends on several factors,
such as the dip, depth of seam, and nature of overlying materials.
Lewis
a. A tremor as the ground adjusts itself to the new stress distribution
caused by new underground openings.
b. In underground mining, a sudden collapse of rock subsequent to a rock
burst.
A device for cooling compressed air between the compressor and the mine
shaft. By cooling and dehumidifying the air, and thus reducing its volume,
the capacity and efficiency of the pipeline are increased.
See also:air-conditioning process; intercooler. Nelson
The mixture of gases that remain in a mine after a mine fire or an
explosion of combustible gases. It consists of carbonic acid gas, water
vapor (quickly condensed), nitrogen, oxygen, carbon monoxide, and in some
cases free hydrogen, but usually consists principally of carbonic acid gas
and nitrogen, and is therefore irrespirable. See also:blackdamp; damp.
Fay
Gases produced by mine explosions or mine fires. Fay
An earthquake that follows a larger earthquake or main shock and
originates at or near the focus of the larger earthquake. Generally, major
earthquakes are followed by many aftershocks, which decrease in frequency
and magnitude with time. Such a series of aftershocks may last many days
for small earthquakes or many months for large ones. CF:foreshock
AGI
In mine subsidence, an inward movement from the side, resulting in a pull
or draw beyond the edges of the workings. Briggs