Ordinarily referred to as a dobe shot. A stick or part of a stick of
dynamite is laid on the rock to be broken and covered with mud to add to
the force of the explosion. A mudcap shot. Hess
a. Adherence of gas molecules, or of ions or molecules in solution, to the
surface of solids with which they are in contact, as methane to coal or
moisture to silica gel. CF:absorption
b. The assimilation of gas, vapor, or dissolved matter by the surface of a
solid or liquid.
c. The attachment of a thin film of liquid or gas, commonly monomolecular
in thickness, to a solid substrate.
Separation by differential adsorption. Pryor, 1
See:adularia
a. A milky white to bluish sheen in gemstones. CMD
b. The changeable white to pale bluish luster of an adularia cut cabochon.
Webster 3rd
c. A floating, billowy, white or bluish light, seen in certain directions
as a gemstone (usually adularia) is turned, caused by diffused reflection
of light from parallel intergrowths of another feldspar of slightly
different refractive index from the main mass. Syn:schiller
A colorless, moderate- to low-temperature variety of orthoclase feldspar
typically with a relatively high barium content. Syn:adular
Precious moonstone, a gem variety of adularia.
a. The work of excavating as mining goes forward in an entry and in
driving rooms; to extract all or part of an area; first mining as
distinguished from retreat. BCI
b. Rate at which a drill bit penetrates a rock formation. Long
c. Feet drilled in any specific unit of time. Long
d. The linear distance (in feet or meters) driven during a certain time in
tunneling, drifting, or in raising or sinking a shaft. Fraenkel
S. Afr. Development to provide an ore reserve in advance of mining
operations. Beerman
In tunnel excavation, a small heading driven in advance of the main
tunnel.
Materials developed since 1960 and being developed at present that exhibit
greater strength, higher strength-density ratios, greater hardness, and/or
one or more superior thermal, electrical, optical, or chemical properties,
when compared with traditional materials (Sorrel, 1987) and with
properties needed to perform a specific function and often entirely new
functions. SME, 1
Gate road that is driven simultaneously with the longwall coal face, when
the advancing longwall technique is used, but which is maintained some 10
to 20 yd (9 to 18 m) or more in advance of the face. The area immediately
ahead of the coal face is therefore preexplored, and steps can be taken to
cope with minor disturbances and thus prevent a serious loss of output.
Nelson
Overburden in excess of the average overburden-to-ore ratio that must be
removed in opencut mining. Mining
The length, measured along the longitudinal axis of the working, tunnel,
or gallery, of the hollow space broken out by each round of shots. For
raises, it is upward advance; for sunk shafts, downward advance.
Fraenkel
A stope in which sections of the face or some pillars are a little in
advance of the others. This is achieved either by beginning the stoping of
the section that is to be advanced earlier, or by proceeding more quickly.
Stoces
The removal of overburden required to expose and permit the minable grade
of ore to be mined. The removal of overburden is known as stripping.
The air-pressure wave preceding the flame in a coal-dust explosion. The
bringing of the dust into suspension is accomplished by such a wave and
the violent eddies resulting therefrom. Syn:pioneer wave
Rice, 2
Mine working that is being advanced into the solid, and from which no
pillar is being removed. See also:first working
Mining from the shaft out toward the boundary. See also:working out
Stoces
A longwall mining technique, most commonly found in European coal mines,
where the gate roads are advanced while the longwall face is advanced
toward the mining limits. The gate roads are maintained throughout the
worked-out portion of the longwall panel.
Spelling variant of aventurine.