The slow downslope movement of talus, either individual rock fragments or
the mass as a whole. AGI
See:alluvial fan
A very fine-grained, soft, gritty, natural stone found in Scotland.
Fay
a. To tightly pack a drilled hole with moist, loose material after the
charge has been placed. Hudson
b. To fill a charged shothole with clay or other stemming material to
confine the force of the explosion. See also:stemming
c. To ram or pound down ballast on a railway track, or road metal.
CTD
d. See:stem
a. In bituminous coal mining, one who fills drill holes in which
explosives have been charged, by machine driller or miner, with clay or
some other tamping material, using a tamping bar. Also called shot tamper.
DOT
b. An implement for tamping or compacting material; a tamping iron or
tamping bar. Sometimes made of wood, copper, or iron with a copper tip.
See also:tamping bar
c. One who tamps. Standard, 2
d. A tool for compacting soil in spots not accessible to rollers.
Nichols, 1
a. The act of inserting and packing explosives and stemming in a shothole.
See also:stemmer
b. The act of packing a drilled hole around a cartridge with fine dirt
from the floor of a mine before blasting, to prevent a misdirection of the
force of the blast. Korson
c. The material placed over a charge in a borehole, to better confine the
force of the explosion to the lower part of the hole. Stauffer
d. Ramming down, as of ballast. Crispin
e. The operation of compacting freshly placed concrete by repeated blows.
Taylor
f. The shaping of a semidry powder, e.g., of refractory material, in a
mold by repeated blows delivered mechanically on the top mold plate.
Dodd
A paper bag that is filled with good stemming material such as sand for
use in horizontal and upward-sloping holes. Plastic bags are also
available for this purpose. See also:tamp
A piece of wood the size of a broom handle for pushing explosive
cartridges and stemming into shotholes. See also:tamper
Hammond; von Bernewitz
A plug of iron or wood used instead of tamping material to close up a
loaded blasthole. Standard, 2
A pole of nonsparking material used to tamp in blast holes.
Syn:loading pole
See:stemmer; stemming rod.
One or more steel drums, fitted with projecting feet, and towed by means
of a box frame. Nichols, 1
See:stemming rod
a. A double-axle drive unit for a truck or grader. A bogie.
Nichols, 1
b. A pair in which one part follows the other. Nichols, 1
A three-axle vehicle having two driving axles. Nichols, 1
A conveyor having a belt drive mechanism in which the conveyor belt is in
contact with two drive pulleys, both of which are driven with the same
motor. NEMA, 2
Hoisting in a deep shaft with two skips running in one shaft. The lower
skip is suspended from the tail rope of the upper skip. Both are loaded
and discharged simultaneously. The upper one discharges at the surface and
is loaded at a pocket halfway down the shaft. The lower skip is loaded at
the shaft bottom and discharges at the half-way pocket. Thus, the rope on
the winding drum is only equal to half the full depth.
See also:two-stage hoisting
A two-celled hydroseparator with troughs. The raw coal feed is conveyed
through a trough by water under pressure where the refuse stratifies to
the bottom. The action in the first cell is that of a forceful upward
current, which results in the removal of the heavy refuse. In the second
cell a lighter current permits the settling of lighter and smaller refuse.
The refuse settles to a perforated cell deck where it joins the slowly
moving slate bed to the discharge. Refuse discharge is controlled by a
refuse gate or hinged plate at the end of the cell bed. Kentucky
A trade name for a longwall steel support system. It consists of two 50-st (45-t) chocks in line at right angles to the face and linked together with
a double-acting ram. In operation, the front chock is lowered and advanced
with the conveyor and reset to the roof; the rear chock is then lowered
and brought forward. Nelson
A longwall conveyor face with two face conveyors of different capacities,
one delivering on to the other--tandem fashion. The layout has the
disadvantage that the whole tonnage of coal must be transported along the
second conveyor, and any breakdown on the second conveyor will affect the
output of the entire face. Nelson
A small hill covering a residual surface of laterite, frequently ore
bearing. Hess