a. A passage leading from an airway to a point in a shaft some distance
above an inset to allow the ventilating current to bypass a station where
skips or cages are loaded. BS, 8
b. A roadway driven through the waste in longwall mining to provide
packing material. Nelson
A ventilating furnace in which the foul flammable air from remote parts of
the mine enters the upcast higher up than the hot gases from the fire.
Webster 2nd
A chute in which there are no meshes or bars for separating the coal, and
down which the run-of-mine coal passes from the tubs direct to the railway
wagon. It is used in small mines where the coal is sold as loaded
underground or at mines where the coal is conveyed by wagon to a central
coal-preparation plant. Nelson
a. A short piece of core or core-size cylinder of rubber or other material
placed in the core lifter in an empty core barrel to guide the first part
of a newly cut core into the core lifter. Syn:guide core
b. A cathode, usually corrugated to give variable current densities, which
is plated at low current densities to remove preferentially impurities
from a plating solution. ASM, 1
c. A substitute cathode that is used during adjustment of operating
conditions. ASM, 1
A second elevator for boosting tailings to higher stacking levels.
N. of Eng. A small gate made on the face between the mother gate and
tailgate for the purpose of getting stone to make strip packs for roof
support (when goaf roof is supported and not allowed to cave).
Trist
One whose name is used by a locator to secure for the latter's benefit a
greater area of mineral land than is allowed by law to be appropriated by
a single person, and any location made in pursuance of such a scheme or
device is without legal support and void. Ricketts
In bituminous coal mining, a laborer who fills paper cartridges
(cylinders) with clay, adobe, or rock dust, used for stemming (tamping
clay or other material on top of explosives) drill holes in the working
face to be blasted down. DOT
A monoclinic mineral, Pb2 (UO2 )3 O2 (PO (sub
4) )2 .5H2 O ; yellow; secondary; radioactive.
An orthorhombic mineral, Al7 (BO3 )(SiO4 )3 O
3 ; fibrous or radiating; Mohs hardness, 7 to 8-1/2; in schists,
gneisses, and pegmatite dikes.
A massive, blue, violet-blue, or blue-black, opaque variety of quartz
colored by intergrown crystals of dumortierite.
A method whereby copper is deposited on a rotating mandrel and later
stripped off as a long strip, which is then drawn into wire without
recasting. Liddell
a. A pile or heap of ore, coal, or waste at a mine.
b. The point where a face conveyor discharges its coal into mine cars.
Nelson
c. The tipple by which the cars are dumped. CF:tipple
d. The fall available for disposal of refuse at the mouth of a mine.
A bailer used in borehole-cementation work, provided with a valving device
that empties the contents of the bailer (cement) at the bottom of a
borehole. Also called liquid dump bailer. Long
A cart having a body that can be tilted or a bottom opening downward for
emptying the contents without handling. Webster 3rd
Excavated material transported and dumped in a heap, generally to
preestablished lines and grades. Should be kept free of tree stumps,
organic matter, trash, and sod if any future use of the filled area is
contemplated. Carson, 1
One of many conveyances that carry and then dump rock or ore. Generally
trucks in surface mining and shuttle cars in underground mining.
SME, 1
A wheeled car with an elevated turntable on which is a track. A mine car
run on the upper, horizontally revolving track can be dumped sidewise or
endwise. Also called hurdy girdy. Zern
A chain grabhook having a lever attachment for releasing it.
Webster 3rd
The building where the loaded mine cars are emptied into the chutes.
Fay
A lifting bucket with a tilt or drop bottom. Standard, 2