A mineral, Cu42+ Al2 (SO4 )(OH)12
.2-4H2 O(?) ; greenish-blue; closely akin to cyanotrichite.
A compact temperature-compensated gravity meter, in which a system is held
in unstable equilibrium about an axis, so that an increase in the
gravitational pull on a mass at the end of a weight arm causes a rotation
opposed by a sensitive spring. The meter weighs 5 lb (2.25 kg) and has a
sensitivity of less than 0.1 mgal. AGI
a. The process of mining coal. BCI
b. To crumble and yield under the action of a squeeze. Applied to pillars
or roof of a coal mine.
c. To be slowly closing under the action of a squeeze. Applied to portions
of mine workings.
d. Denoting that creep or squeeze is taking place. Hudson
e. The product of a force in terms of weight and the lineal distance
through which it acts. Hammond
f. To undergo gradual movement, such as heaving, sliding, or sinking; said
of rock materials. AGI
g. Ore before it is beneficiated. Fay
h. A place where industrial labor of any kind is carried on. Usually in
the plural as saltworks, ironworks, etc. Webster 3rd
i. Objects that are to be, are being, or have been treated, such as in
cleaning or finishing. ASM, 1
A coal seam or orebody of such thickness, grade, and depth as to make it a
good prospect for development. In remote and isolated locations, other
factors influence minability, such as access, water supply, transport
facilities, etc. See also:economic coal reserves
Any bed or vein that is capable of being mined, but usually applied to a
coal seam or ore deposit that can be mined profitably.
The part of a lever between the fulcrum and the working end.
Nichols, 1
The limit of energy expended or absorbed, within which a body is not
unduly fatigued. Brantly, 2
a. A mine, or large section of a mine, from which all minable coal or ore
has been taken. BCI
b. Exhausted; said of a coal seam or ore deposit.
A special cage for raising and lowering workers in a mine shaft.
See also:worker car
A type of car for transporting miners up and down mine shafts; also cars
used to transport miners from the shaft to working areas.
See also:worker cage
a. A small door in a stopping to allow the passage of workers.
Nelson
b. Scot. A small trapdoor on a traveling road. Fay
In mining, a person who operates the hoisting engine that serves the shaft
in which only workers are raised from and lowered into a mine. DOT
a. A trip made by mine cars and locomotives to take workers, rather than
mined material or supplies, to and from the working places. BCI
b. A similar trip made by a worker cage in a shaft.
a. When a coal seam is being squeezed by pressure from the roof and floor
it emits creaking noises and is said to be "working." This noise often
serves as a warning to miners that additional support is needed. Sagging
roof emitting noises and requiring additional timbering. BCI
b. A working may be a shaft quarry, level, opencut, or stope, etc. Usually
in the plural. See also:labor; workings. Fay
Activities such as extracting ore, building structures, and otherwise
developing a mining claim after ore is discovered. Ricketts
The amount of money available to finance the operations of a company
beyond the amount required for the purchase of fixed assets, such as
property. Truscott
A complete set of operations. In excavation, it usually includes breaking,
loading, moving, dumping, and returning to the loading point.
Nichols, 1
The place at which mining is being done in a breast, gangway, airway,
chute, heading, drift, adit, crosscut, etc. See also:face
The immediate excavation needed for opencast working of ore.
Nelson