The mechanism that imparts the reciprocating motion to a shaker conveyor
trough line. The term is frequently shortened to drive, such as shaker
drive, uphill drive, etc. Jones, 1
A metal wedge, driven into a wooden or soft-metal base plug in a borehole,
that acts as a fixed point on which and by means of which a deflection
wedge may be set and oriented. Long
a. Extending excavations horizontally or near the horizontal plane.
CF:sinking; raising. Nelson
b. The making of a tunnel or level (a drive) in a mineralized lode or
vein, as distinct from making one in country rock (crosscutting).
CTD
c. Breaking down coal with wedges and hammers. CTD
d. A long narrow underground excavation or heading. Fay
e. Eng. In the Bristol coalfield, a heading driven through rock.
Fay
Steel cap placed above line of casing pipes of drill hole to protect
threaded top of pipe while driving them deeper. Driving shoe gives
protection to the bottom pipe of line. Pryor, 3
The driving mechanism of a belt conveyor. It consists of an electric motor
or compressed-air turbine connected through a train of reduction gearing
to the drum or drums. Motion is imparted to the belt by the frictional
grip between it and the drums. Sinclair, 5
The keeping of a heading or breast accurately on a given course by means
of a compass or transit. Also, called driving on sights.
a. Granulated material obtained by pouring melted material into water.
Standard, 2
b. In the roof of a coal seam, a funnel-shaped downward intrusion of
sedimentary rock, usually sandstone. See also:stone intrusion
AGI
c. The vertical displacement in a downthrow fault; the amount by which the
seam is lower on the other side of the fault. CTD
d. In an air lift, the distance the water level sinks below the static
head during pumping. Lewis
e. The small downward descent of the upper section of a drill rod, casing,
or pipe into a lower like section when the threads of the box- and
pin-threaded parts match, so that upper and lower sections may be screwed
together without cross-threading. Long
f. The sudden descent of a bit that occurs when a bit encounters a cavity
or cuts through a hard rock and enters a very soft rock. Long
g. To lower drill-string equipment into a borehole. Long
h. To lower the cage to receive or discharge the car when a cage of more
than one deck is used. Fay
i. To allow the upper lift of a seam of coal to fall or drop down.
Fay
j. To lose equipment in a borehole. Long
A method of breaking oversize stones left after quarry blasting. The balls
weigh from 30 hundredweight (1,360 kg) to 2 st (1.8 t) (many use old cones
from gyratory breakers) and are dropped from a crane on to the oversize
stone. The drop height varies from about 20 to 33 ft (6.1 to 10.1 m). The
method is economical and avoids secondary blasting. Nelson
A cage so designed that the middle section of the floor drops a few inches
when the cage is lifted from the keps. The mine car is thus kept
stationary and secure. Nelson
A mine car so constructed that all the haulage motor has to do is to pull
the loaded trip across the dump. A trigger trips the flaps in the bottom
of the car, allowing the coal to drop out, and a second one closes the
flaps as the car leaves the dump. See also:mine car
Placed at intervals along tailings line to compensate for slope in excess
of that required to keep the pulp moving gently through its launders or
pipes. Pryor, 1
The initial cut made in the floor of an open pit or quarry for the purpose
of developing a bench at a level below the floor.
Hinged doors at the bottom of a cupola furnace, which drop down to allow
the furnace to be cleaned. Mersereau, 2
a. A forging hammer that depends on gravity for its force. ASM, 1
b. A pile driving hammer that is lifted by a cable and obtains striking
power by falling freely. Nichols, 1
A timber that in an emergency can be dropped by a remote control across a
mine track at the top or bottom of an incline to derail cars.
Portable rail crossing used to transfer wagons from one track to another.
Hammond
Pieces of core not picked up or those pieces that slip out of the core
barrel as the barrel is withdrawn from the borehole. Long
a. A branch vein pointing downwards. See also:leader
b. A spar dropping into the lode. Zern
c. See:feeder
d. A branch leaving a vein on the footwall side. Zern
e. See:car runner; car dropper.
Aust. The second working, consisting of drawing the pillars, and in thick
seams breaking down the upper portion of the seam that was left
temporarily in position. Fay
See:stalagmite
A shaft in a mine, in which coal is lowered by a brake wheel.