A transducer whose output waves are independent of any sources of power
controlled by the actuating waves. Hy
a. A metal that is normally active according to its position in the
electromotive-force series is said to be passive whenever its
electrochemical behavior is that of a less active metal.
b. A metal is passive when it is relatively resistant to corrosion in an
environment in which a large decrease in free energy is associated with
the corrosion reaction.
c. A condition in which a piece of metal, because of an impervious
covering of oxide or other compound, has a potential much more positive
than the metal in the active state. ASM, 1
An iron pipe connecting the water at the back of one set of tubbing with
that of another, or a pipe only in communication with one tub and open to
the interior of a shaft. Fay
a. The claylike matrix of a dirty sandstone; e.g., the microcrystalline
matrix of a graywacke, consisting of quartz, feldspar, clay minerals,
chlorite, sericite, and biotite. AGI
b. The mineral substance in which other minerals are embedded; groundmass
(as of a porphyry). Webster 2nd
c. An imitation gemstone made from a certain type of lead glass; loosely
applied to all glass imitation gemstones. Anderson
d. A white clay body.
e. In magnetic particle suspension, finely divided ferromagnetic particles
in paste form used in the wet method.
f. A slurry of sulfur and water, usually containing 30% to 50% of finely
divided elemental sulfur.
g. Material of which a porcelain body is formed. Hard paste (pite dure),
composed of china stone and china clay, is true porcelain. Soft paste
(pite tendre), composed of glass or frit with white, is artificial
porcelain.
h. Comparatively concentrated dispersion (greater than 10% by volume) of
fine-solid or semisolid particles in a liquid; often shows elastic or
plastic behavior. Bennett
a. A class of backfills that has low water content; high densities (> or
=75% by lot); and consistency, transport, and deposition properties
different from those of traditional low-concentration slurries or other
types of high-concentration backfill. Aref
b. Paste fill (high pulp density) that does not settle out of suspension
at zero flow density and does not produce free water when placed in a
stope. Uncemented paste fill can generally be mobilized reasonably easily
by pumping if left standing in a pipe for many hours.
The transport and placement of high-concentration, low-slump material by
positive displacement through pipelines by pumps, similar to those used
for concrete pumping. See also:paste fill
The operation of mudcapping or plaster shooting whereby rock is blasted
without drilling. An explosive is placed on top of the rock and covered by
a cap of mud or similar material.
a. A mine village, usually built and owned by a coal company.
Korson
b. A small placer property.
Distributed in an irregular manner, as when ore occurs in bunches or
sporadically. Fay
Scot. The bottom, or lowest, coal sunk through in a shaft. Fay
A document that conveys title to the ground, and no further assessment
work need be done; however, taxes must be paid. The procedure of obtaining
a patent is divided into five steps: (1) a mineral surveyor is paid to
make a patent survey, to adjust boundaries and correct errors, in which
case an amended location should be made; (2) at least $500 worth of
improvement must have been made per claim; (3) the presence of valuable
mineral must be proven beyond reasonable doubt; (4) the matter is taken up
with the local land office, and the proper notices must be published in
the papers for a specified time; and (5) the purchase price of the land is
paid and the patent is received. Lewis
A type of surfacing machine employed to remove irregularities from the
surface of blocks of stone.
A claim to which a patent has been secured from the U.S. Government, in
compliance with the laws relating to such claims. See also:patent
Galvanized steel rope. Pryor, 3
An accurate survey of a mineral claim by a U.S. deputy surveyor as
required by law to secure a patent (title) to the claim. Fay
A metallurgical process consisting of a chloridizing roasting, leaching
with water to remove base metals (some silver is dissolved and must be
recovered), leaching with sodium hyposulfite for silver, and the
precipitation of silver by sodium sulfide. The process was first carried
out by von Patera at Joachimstal (Jachymov), Czech Republic.
Liddell; Fay
A chain pump; named from fancied resemblance of the disks and endless
chain to a rosary. Standard, 2
In geochemical exploration, a relatively mobile element or gas that occurs
in close association with an element or commodity being sought, but can be
more easily found because it forms a broader halo or can be detected more
readily by analytical methods. A pathfinder serves to lead investigators
to a deposit of a desired substance. Often called indicator element, but
this latter term is restricted by some authors to elements that are
important components of the ores being sought. AGI
See:line of creep
Strictly, the green film formed on copper and bronze after long exposure
to the atmosphere. By extension, the term is applied to a film of any sort
formed on wood, marble, chert, or other material after weathering or long
exposure. See also:desert varnish
Chert nodules with weathered or case-hardened surface layers. AGI