A warning device affixed to the roof or back of a mine that automatically
displays a visual indication when rock displacement begins.
See also:safety light
Permanent magnet or electromagnet used in crushing system to arrest or
remove tramp iron ahead of the crushing machinery. Pryor, 3
A plate in front of an iron furnace, covering the taphole through which
the slag is drawn out. Standard, 2
A black, fissible substance, an iron ore, in which a bituminous shivery
earth abounds. Arkell
a. The bearing of a shaft, esp. when made of a separate piece.
Standard, 2
b. A metallic journal piece set into the end of a wooden shaft. A
reinforced bushing or a thrust-absorbing block.
Standard, 2; Nichols, 1
A silver-white to steel-gray sulfantimonide of iron, FeSbS. Isomorphous
with arsenopyrite; elongated crystals; orthorhombic. From Gudmundstrop,
Sweden. English
a. A trace element substituting a common element in a rock mineral.
b. See:trace element
Som. A self-acting inclined plane underground; sometimes called a dip
incline.
A mineral, Ca2 BeSi2 O7 , tetragonal, in skarn rocks
near Gugia (presumably in China). A member of the melilite family near
meliphane but containing little sodium or fluorine; an unnecessary name.
Named from the locality. See also:meliphanite
Hey, 3; Fleischer
a. A white (sometimes red or yellow), loose, earthy, water-laid deposit of
a mixture of clay or ocher, occurring in the cavities of rocks.
AGI
b. See:diatomite
a. A pulley to lead a driving belt or rope in a new direction or to keep
it from leaving its desired direction. Long
b. The tracts that support and determine the path of a skip bucket and
skip bucket bail.
See:dummy
Any fossil that has actual, potential, or supposed value in identifying
the age of the strata in which it is found or in indicating the conditions
under which it lived; a fossil used esp. as an index or guide in the local
correlation of strata. CF:index fossil
A frame designed to be held rigidly in place by roof jacks or timbers, and
with provisions for attaching a shaker conveyor panline to the movable
portion of the frame, which can be used to prevent jumping or side
movement of the panline. Jones, 1
An idler roll with its supporting structure so designed that when it is
mounted on the conveyor frame it guides the belt in a defined horizontal
path, usually by contact with the edge of the belt. NEMA, 1
A loose pulley used to guide a driving belt past an obstruction or to
divert its direction. CTD
A heavy drill rod coupled to and having the same diameter as a core barrel
on which it is used. It gives additional rigidity to the core barrel and
helps to prevent deflection of the borehole. Also called core-barrel rod;
oversize rod. CF:drill collar
See:cage guide
A runner driven ahead of other runners to guide them. Hammond
a. Wood, steel, or wire-rope conductors in a mine shaft, which are engaged
by shoes on the cage or skip so as to guide its movement.
b. Timber or metal tracks in a hoisting shaft, which are engaged by shoes
on the cage or skip so as to steady it in transit. In collieries rope
guides are sometimes used. Pryor, 3
c. The holes in a crossbeam through which the stems of the stamps in a
stamp mill rise and fall.
d. A pulley to lead a driving belt or rope in a new direction, or to keep
it from leaving its desired direction. Standard, 2