Usually found at sand and gravel processing facilities. A mechanical
device consisting of a roller (with rows of metal protrusions along its
length) placed at a 45 degrees angle just ahead of a feed hopper (or
conveyor transfer point). It is usually run by a small electric motor and
as roots, large stones, and clay meet the roller, they are dumped off the
belt to a small pit that is periodically cleaned out.
See:rock association
See:mountain leather
a. Any device or machine used specif. for loading slate or rock inside a
mine. However, it is most frequently used with scraper loaders equipped
for handling rock. Syn:rock-loader operator
b. See:box loader
See:rock loader
In bituminous coal mining, a foreman who is in charge of the drilling of
holes in rock or slate and the charging and tamping of explosives in the
holes drilled by miners prior to blasting. See also:slateman
DOT
See:rock flour
a. Mathematical analysis of the forces acting along joints, faults, and
bedding planes of natural rock in situ, esp. in the evaluation of wall
strengths, and hence slopes and slope ratios, in open-pit mines.
b. The theoretical and applied science of the physical behavior of rocks,
representing a branch of mechanics concerned with the response of rock to
the force fields of its physical environment (NAS-NRC, 1966). AGI
A liquid solution of rock-forming mineral ions at sufficiently high
temperatures to be considered molten.
Soft pulverulent forms of calcite found in caves, or as an efflorescence.
See:agaric mineral
In anthracite and bituminous coal mining, a miner who works in rock as
distinguished from coal. DOT
A cranelike loading machine used at opencast pits and quarries.
See also:power shovel
See:pedestal
See:phosphate rock
See:hoodoo
a. The pressure exerted by surrounding solids on the support system of
underground openings, including that caused by the weight of the overlying
material, residual unrelieved stresses, and pressures associated with
swelling clays. AGI
b. The compressive stress within the solid body of underground geologic
material. AGI
c. See:ground pressure; geostatic pressure.
d. In petroleum geology, the pressure under which fluids, such as water,
oil, and gas, are confined in rocks. No particular cause or origin of the
pressure is implied. Geophysicists and isostasis, however, have used, and
are using, the term rock pressure in the primitive and more correct sense
of the pressure exerted on underlying rock by superincumbent strata. To
avoid confusion, it is desirable to substitute for the term rock pressure,
as now used in oil, gas, and underground water technology, the more
appropriate term reservoir pressure. Stokes
A sudden and violent failure of rock masses under stresses exceeding the
elastic strength of the rock. The classification and nomenclature of these occurrences are not clear and are based largely on effects and not on the
basic causation factor. See also:pressure bump; rock bump; rock burst.
Nelson
Ordinary crystalline quartz. Also called rock crystal.
A heavy duty rake blade. Nichols, 1
Inverted ridges of rock, usually sandstone, extending from the overlying
strata into a coal seam, caused by localized streams active during the
formation of the coal. See also:classical washout