a. The large winding drum on which the drill cable or bull rope of a churn
or cable-tool drill is wound. Long
b. Large sheave at the top of the mineshaft headframe over which the cage-
or skip-hoist rope passes. Long
c. An underground sheave wheel; particularly, the wheel around which the
tail rope is passed beyond each terminal of a tail-rope haulage system.
d. The pulley that rotates the camshaft of a stamp battery. Nelson
A developing heading driven to the dip, usually the full dip of the coal
seam; worked by rope haulage. Nelson
See:springing
A small boat equipped with a hoist and used for handling dredge lines and
anchors. Nichols, 1
a. Any dull, hollow sound produced in a coal seam or associated strata as
a result of mining operations. See also:outburst; crump; rock bump;
rock burst. Nelson
b. Sudden failure of the floor or walls of a mine opening, generally
accompanied by a loud report and a sharp shock or jar. Long
c. An earth tremor occasioned by a rock failure, when that failure causes
no damage to the workings. Spalding
d. A noise caused by a break in the roof underground. Mason
e. The actual movement due to the roof break. Mason
f. A sudden floor uplift due to a break in the floor. Mason
g. In coal mining, shock due to the movement of coal, floor, or roof
strata, with sufficient violence to be heard and to shake the workings.
Pryor, 3
h. Rebound caused by a sudden release of tension on the drill stem when a
core breaks or snaps free of the bottom of the borehole. Long
i. A sharp, upward blow applied to the drivepipe, casing, or drill stem
with a drive hammer. Long
a. A worker who pushes loaded cars or cans into a station for the hooker
and removes the empties. Hess
b. A device used to loosen the tools when drilling is carried on without
jars. Porter
c. A fender for lessening the jar caused by the collision of cars or other
moving equipment. Jones, 1
d. See:catch
e. A machine used for packing molding sand in a flask by repeated jarring
or jolting. ASM, 1
An impeding device at dumping locations where there is a hazard of vehicle
overtravel. Federal Mine Safety
Barrier of heavy steel construction anchored at a track ending to stop
rolling railroad cars and prevent their being thrown off center or
derailed. Best, 1
See:shaking table
An appliance for handling broken rock in flat mine stopes. A sheet-steel
trough is hung from chains and arrested at one end of its swing by a bump
stop, so that the ore slides forward. Pryor, 3
Sudden, violent expulsion of coal from one or more pillars, accompanied by
loud reports and earth tremors. Bumps occur in coal mines where a strong,
thick, massive sandstone roof rests directly on the coal with no
cushioning layer of shale between. The breaking of this strong roof as the
seam is mined causes violent bumps and the crushing and bursting of
pillars left for support. There are two distinctive types of bumps: (1)
pressure bumps, which appear to be due to the unit loading of a pillar
being too great for its bearing strength, and where the coal roof and
floor are strong, the pillar is ruptured suddenly and with violence; and
(2) shock bumps, which are thought to be due to the breaking of thick,
massive, rigid strata somewhere above the coalbed, which causes a great
hammerlike blow to be given to the immediate roof, which it transmits as a
shock wave to the coal pillar or pillars. Kentucky; Lewis
Group of seismometers located at short intervals at the same seismometer
station and electrically interconnected. Syn:multiple seismometers
Schieferdecker
a. An orebody containing small scattered masses of bunches of ore.
Weed, 2
b. A mine that is sometimes rich and at other times poor. Hess
Any artificial embankment used to control the flow of water in a river or
on irrigated land. The term is applied extensively in India to large low
dams and dikes and also to the small ridges between rice fields. Also, an
embanked causeway or thoroughfare along a river or the sea. AGI
A vessel for the storage of materials; the lowermost portion is usually
constructed in the form of a hopper. Also called bin.
See also:surge bunker; underground bunker. BS, 5
Applied to coal consumed by ocean steamers, tugs, ferryboats, or other
steam watercraft. Also called bunkers. Fay
A high-capacity conveyor that takes peaks of production from another
conveyor and retains and/or discharges the material when production drops.
Such a conveyor may be laid under or alongside a trunk belt near its
discharge end. The floor of the bunker comprises a slow-moving steel plate
conveyor operated by hydraulic or other power. A movable plow plate,
situated over the trunk belt, diverts the material sideways into the
bunker conveyor. See also:underground bunker
See:bin gate
The capacity of anything. It may be expressed as a tonnage or as so many
hours of normal production. Bunkering capacity may be provided at the
surface and at critical points underground. Nelson
a. A mass of ore not lying in a regular vein. Also spelled bunny, bonny,
bonney. Nelson
b. Corn. An isolated body of ore. Hess
See:bunney