A short timber prop for supporting coal in holing or undercutting; a
sprag. Standard, 2
A valve that, in opening, is lifted bodily from its seat by its spindle
instead of being hinged at one side. See also:poppet; poppet valve.
Fay
An underground set of pumps. Fay
In mine subsidence, bending without fracture. Briggs
See:vitrain
A collection of microbial cells of the same species in a container that is
devoid of any other form of life. Rogoff
Any of a group of refractories including alumina, magnesia, thoria,
zirconia, beryllia, and ceria. Osborne
Ceramic product made from any of the pure oxides of nonmetallic materials;
i.e., Al2 O3 , MgO, SiO2 , etc.
A strain in which a rock body is elongated in one direction and shortened
at right angles to this in such an amount that the volume remains
unchanged. AGI
The product of a basic open-hearth furnace refined to a point where the
impurities are reduced to the lowest practicable minimum, after which
copper and molybdenum are added in correct proportions.
Mersereau, 2
Timbers spanning from truss to truss, and supporting the rafters of a
roof. Crispin
High-purity iron. Osborne
An old syn. for kermesite. Fay
A miners' term for bornite. Syn:bornite
Sintered pyritic ore.
An orthorhombic mineral, MnPO4 ; forms a series with heterosite;
deep red or reddish purple; forms small, irregular masses as an alteration
product of lithiophilite and triphylite; at Pala, CA; Hill City, SD;
Newry, ME; and the Erongo Mountains, Namibia.
A fully automatic and remotely controlled system of coal cutting, loading,
and face conveying, including self-advancing roof support systems.
See also:manless coal face
A system in which the operation of the winder is similar to automatic
cyclic winding, but the starting is instigated by the onsetter and
banksman. When everything is ready for winding, the onsetter and banksman
press their respective start pushbuttons and the winder starts,
accelerates, and banks automatically without the intervention of the
winding engineman. With this form of control, loading and discharging of
the skips is fully automatic. See also:automatic cyclic winding;
manual winding control. Nelson
a. A laborer who pushes loaded mine cars on tracks from underground
working places to haulage roads where they are hooked up to a locomotive
and hauled to the surface, shaft, or slope bottom for hoisting. A pusher
may, at bituminous mines, shift empty and loaded cars in and about the
tipple, where coal is prepared for market. Also called: car puller; car
shifter; headsman; putter; trailer; trammer. Syn:mule; wheeler.
DOT
b. One who encourages or hastens the miners. Also called jigger boss.
Ricketts
c. A tractor that pushes a scraper to help it pick up a load.
Nichols, 1
A bulldozer exerting pressure on the rear of a scraper loader while the
loader is digging and loading unconsolidated ground being excavated and
moved during opencast mining.
A hole through which glass is introduced to a flattening furnace.
Standard, 2