a. Restoring the disturbed land to the conditions which existed at the
site before any disturbance occurred. SME, 1
b. The process of gaining or recovering land, bringing it into a condition
for cultivation or other use. SME, 1
c. Response to any disturbances to the Earth and its environment caused by
mining activity. SME, 1
d. Returning the disturbed site "to a form and productivity in conformity
with a prior use plan." SME, 1
e. The Surface Mining Control and Reclamation Act of 1977 (SMCRA) states
that, among other provisions, reclamation must "restore the land affected
to a condition capable of supporting the uses which it was capable of
supporting prior to any mining, or higher or better uses." SME, 1
The action taken to fill or seal the cracks or openings through which
drill fluid is escaping from the borehole into the rocks forming the walls
of the borehole and by which the drill fluid is made to return to and
overflow the collar of the borehole. Long
restrained cable plug and socket
a. A flameproof restrained plug and socket incorporates an interlock to
ensure that the power connections are dead when they are separated or
until they make contact; the design is such that the enclosure is
flameproof at all times when there is contact between the pins and tubes.
BS, 13
b. A plug and socket designed to be held together by an operating bolt, or
screwed union ring, or other equivalent device, the use of which enables
the plug to be readily inserted or withdrawn. BS, 13
These are used when the cable is removed from a machine or apparatus
frequently. The most common type is the 100-amp British Standard plug and
socket, and it is employed to connect the trailing cable to a coal cutter
or face conveyor. The gland of the plug is arranged to grip the sheath of
the cable and to make connection with the screen and earth core. Power and
pilot conductors are connected to the appropriate contact tubes, which
make connection with corresponding pins in the socket portion.
Mason
restricted earth fault protection
As used in mining, a system of earth fault protection in which the fault
current is limited, without requiring the use of sensitive earth fault
protection. BS, 13
That part of any resource category that is restricted from extraction by
laws or regulations, but otherwise meets all the requirements of reserves.
USGS, 2
The arrangement at the top and bottom of a shaft, or intermediate levels,
for supporting the shaft cage while changing the tubs or cars.
See also:chair; catch; wing.
a. To mine or strip sufficient barren rock to expose a narrow but rich
vein, which is then extracted in a clean condition. Nelson
b. To open up a stope, not in the vein but in the wall rock.
See also:resuing
c. In lode mining, separate removal of undercut barren rock immediately
below a lode or vein too narrow for human entry. Following this, the lode
is mined and separately removed. Used when the lode is less than 30 in (76
cm) wide. Pryor, 3
a. A method of stoping wherein the wall rock on one side of the vein is
removed before the ore is broken. Employed on narrow veins, less than 30
in (76 cm), and yields cleaner ore than when wall and ore are broken
together.
b. A method of stoping in which the ore is broken down first and then the
waste or vice versa; usually the one which breaks easier is blasted first.
The broken waste is left in the stope as filling, and the ore is broken
down on flooring laid on the fill to prevent admixture of ore and waste.
Resuing is applicable where the ore is not frozen to the walls and works
best if there is considerable difference between the hardness of the ore
and of the wall rocks.
See:emergence
In sieving or screening, that mesh at which division is made between
oversize (arrested on screen) and undersize (passing through meshes).
Pryor, 3
a. In drilling, a shoulder inside a reaming shell that prevents entry of
the core lifter into the core barrel. Long
b. A term sometimes incorrectly applied to a core lifter. Long
The screen that has retained the particles. Pit and Quarry
A temporary or permanent structure used for holding dredged material on a
limited basis, not to be confused with a confined disposal facility.
In crystal optics, the amount by which the slow wave falls behind the fast
wave during passage through an anisotropic crystal plate. Retardation
depends on plate thickness and the difference in refractive indices of its
two principal directions. AGI
a. A chain-type conveyor used on steeply inclined faces, where the problem
is not so much to move the coal but rather to restrain its movement
downhill. It consists of link chains carrying discs 6 to 8 in (15 to 20
cm) in diameter at every yard (0.9 m). The endless chain runs in an open
semicircular trough, and the coal is lowered to the discharge end. The
chain returns uphill, in an enclosed tube, to the driving unit at the top
end. Its capacity is about 100 tons per hour. Nelson
b. Any type of conveyor used to retard the rate of movement of bulk
materials, packages, or objects, where the slope is such that the conveyed
material tends to propel the conveying medium.
See also:declining conveyor
The capacity of a material to retain a portion of the magnetic field set
up in it after the magnetizing force has been removed. ASM, 1
A tetragonal mineral, NiSO4 .6H2 O ; dimorphous with
nickelhexahydrite; blue green; associated with morenosite, the
septehydrate.
Thallium silver nitrate that melts to a yellow liquid at 75 degrees C
having a density of 4.6 g/cm3 ; can be diluted and used as a
heavy liquid for mineral separation.
See:reticulate
a. Said of a vein or lode with netlike texture; e.g., stockwork.
CF:stockwork
b. Said of a rock texture in which crystals are partially altered to a
secondary mineral, forming a network that encloses remnants of the
original mineral. CF:mesh texture
Syn:reticular