a. An instrument that detects, magnifies, and records motions of the
Earth, esp. those caused by earthquakes or explosions. The resulting
record is a seismogram. CF:seismometer; geophone. AGI
b. The instrument used to record the reception of the waves in the sound
seismic method. It works on the general principle that its frame is shaken
by the arrival of the waves, while a pendulum of high inertia, mounted in
it, remains stationary. The relative movement of the frame and the
pendulum is magnified by optical means in the seismograph and by
electrical amplifiers in the geophone. The instrument can also detect and
record earthquakes. See also:geophone; vibrograph. Nelson
A rotary drill, pump, and hinged mast mounted as an integral drilling unit
on a truck body and used primarily to drill vertical shallow holes in
which explosives are placed and detonated to produce shock waves from the
rock strata, which then are measured by seismic recording instruments.
Also called jackknife rig; rotary shot drill; shothole drill.
Syn:seismic drill
A collared, tapered, V-thread-coupling drill rod used on seismograph
drills. Long
a. The science of earthquakes and attendant phenomena.
Schieferdecker
b. A geophysical science that is concerned with the study of earthquakes
and measurement of the elastic properties of the Earth. AGI
c. The study of earthquakes, and of the structure of the Earth, by both
natural and artificially generated seismic waves. AGI
An instrument that detects Earth motions. Syn:seismic detector
CF:geophone; hydrophone; seismograph. AGI
Distance between successive seismometer positions. Schieferdecker
A set of seismometers, placed along a straight line, that record the same
shot. Schieferdecker
An instrument that merely indicates the occurrence of an earthquake. It is
considered by some, however, to be the equivalent of a seismometer.
AGI
a. To bind wire rope with soft wire, to prevent it from raveling when cut.
Nichols, 1
b. See:bind; freeze.
c. To cohere or stick to an inadequately lubricated moving part, such as a
bearing, piston, or sliding part, through excessive friction, pressure, or
temperature. Long
d. To protect rope ends by binding with yarn, marline, or fine wire.
Long
Dumped fills made up of selected materials. These fills are used when it
is desired to utilize a particular property of a soil or rock and this
property can be secured solely by selective excavation. Carson, 1
In coal beneficiation, the separation of coal from associated impurities,
usually aided by additions of oily reagents that selectively attach to the
coal surfaces. Generally restricted to material of 500 mu m top size.
See also:oil agglomeration
Crushing in such a manner as to cause one ingredient of the feed to be
crushed preferentially to others. BS, 5
Separating two or more types of soil while digging them.
Nichols, 1
Hand filling, during which the miner rejects stone or dirt and loads only
clean coal. Similar methods are adopted in metal mining. Nelson
a. A process for the preferential recovery of a particular ingredient of
the coal, e.g., a petrological constituent, by froth flotation.
BS, 5
b. Generally refers to the surface or froth selecting of the valuable
minerals rather than the gangue. Sometimes used to mean differential
flotation. See also:flotation; preferential flotation. Fay
Grinding in such a manner as to cause one ingredient of the feed to be
ground preferentially to others. BS, 5
a. A method of mining whereby ore of high value is mined in such a manner
as to make the low-grade ore left in the mine incapable of future
profitable extraction. In other words, the best ore is selected in order
to make good mill returns, leaving the low-grade ore in the mine.
Frequently called robbing a mine. CF:bulk mining
b. The object of selective mining is to obtain a relatively high-grade
mine product; this usually entails the use of a much more expensive
stoping system and high exploration and development costs in searching for
and developing the separate bunches, stringers, lenses, and bands of ore.
In general, selective methods are applicable where the valuable sections
of the deposit are rather large, comparatively few in number, and
separated by relatively large volumes of waste. Selective methods of
stoping are square-set stoping, open stoping in low-dipping beds, and
cut-and-fill stoping.
c. In coal mining, selective methods may be dictated by market demands and
prices. It may be desirable to work the different quality coal seams in
such proportions as to obtain a uniform and salable blend over a period of
years. In metal mining, the stopes may be restricted in both length and
width and thus produce a much higher grade of ore. It is not always
practicable to resort to selective mining because the mineralization may
be so distributed as to necessitate taking the whole orebody in mining
operations. Nelson
The reflection by a substance, such as an opaque gem, of light rays of
only certain wavelengths, the others being absorbed. This cause of color
in gems is a sort of selective absorption.
In mineral processing, development of selective attraction to the water
phase of a pulp, as a prelude to flotation of an air-attracted fraction of
the contained minerals. Pryor, 3
Criterion of trend in a continuous operation such as mineral processing.
Abbrev., S.I. Pryor, 3