In sublevel caving, the crosscuts driven between every other slice from 18
to 36 ft (5.47 to 10.94 m) apart. Lewis
In continuous mining, slicing consists of driving up some four to six
places the set or desired distance, which may be 1,000 ft (304.8 m) or
more, and then pulling the pillars on retreat. After completion of one
slice, the unit moves over and mines another along the gob.
See also:top slicing
See:overhand stoping
Removal of a horizontal layer from a massive orebody. In top slicing
extraction retreats along the top of the orebody, leaving a horizontal
floor that becomes the top of the next slice. A timber mat separates this
from the overburden, which caves downward as the slices are made. Other
methods attack from the bottom (sublevel caving) or side. Pryor, 3
Ore in a state of fine subdivision. Syn:slime
Extremely fine-grained material, such as finely pulverized tailings
discharged from hydraulic mines or a thin layer of extremely fine silt
deposited by a stream during a flood. AGI
The striations, grooves, and polish on joints and fault surfaces.
CF:striation
A small implement used in a foundry for smoothing the surface of a mold.
Standard, 2
A hole column loaded with explosive, without springing. Nichols, 1
A narrow vein of ore. Standard, 2
In coal mining, a term used to describe the roof of the coal vein when it
is very smooth. Kentucky
a. An upright rail fixed in a shaft with corresponding grooves for
steadying the cages. Fay
b. A trough used to guide and to support rods in a tripod when drilling an
angled hole. Also called rod slide. Long
c. The bottom of a gold-washing cradle. Standard, 2
d. As used by churn drillers, a fault plane or opening encountered in a
hole that deflects the bit. Long
e. A mass movement of descent resulting from failure of earth, snow, or
rock under shear stress along one or several surfaces that are either
visible or may reasonably be inferred; e.g., landslide, snowslide, and
rockslide. The moving mass may or may not be greatly deformed, and
movement may be rotational or planar. A slide can result from lateral
erosion, lateral pressure, weight of overlying material, accumulation of
moisture, earthquakes, expansion owing to freeze-thaw of water in cracks,
regional tilting, undermining, and human agencies. AGI
f. The mass of material moved in or deposited by a slide. AGI
See:slip joint
A mounting of steel or cast iron for a belt driven machine enabling it to
be moved along as the belt stretches in order to take up the slack.
Hammond
Rock making up the mass of material in a landslide or talus.
Angle at or above which rock in movement will continue to slide, but less
than the angle needed to initiate movement from rest. Pryor, 3
Sliding friction is the resistance offered when one body slides over
another body. The amount of friction or resistance is dependent on the
laws of friction. Morris
A crest gate that has a high frictional resistance to opening and is
therefore suitable only for small gates. See also:roller gate
Hammond
A method of paying for the coal in proportion to the amount of lump coal
it contains. Fay
A system which regulated colliers' wages by the ascertained selling price
of coal. Nelson