drill-split narrow-vein mining
The act of mining narrow veins down to 0.6 m using a drill-split tool on a
carriage that is independently mobile and remote-controlled.
Lombardi
A device that combines a drill and a splitter, which is a unique tool
designed to apply radial and axial loads to a rock mass, into a single
tool that drills and splits rock in recurring cycles. Lombardi
a. A round or hexagonal steel rod for boring in coal, ore, or rock. It
consists of shank, shaft, and bit. It forms an important part of
jackhammers and drifters. Nelson
b. Hollow steel connecting a percussion drill with the bit.
Nichols, 1
c. See:stem
A series of integral drill-steel sizes consisting of starter and follower
bits, necessary for drilling a hole to a certain depth. The length
increment is usually determined by the wear of the bit and the feed length
of the feeding device. Fraenkel
a. In standard drilling, a cylindrical bar of steel or iron screwed onto
the cable tool bit to give it weight. AGI
b. In rotary drilling, a string of steel pipe screwed together and
extending from the rig floor to the drill collar and bit at the bottom of
the hole. The drill pipe transmits the rotating motion from the rotary
table to the bit and conducts the drilling mud from the surface to the
bottom of the hole. See also:drill string
A procedure for determining the potential productivity of an oil or gas
reservoir by measuring reservoir pressures and flow capacities while the
drill pipe is still in the hole, the well is still full of drilling mud,
and usually the well is uncased. The tool consists of a packer to isolate
the section to be tested and a chamber to collect a sample of fluid. If
the formation pressure is sufficient, fluid flows into the tester. Abbrev:
DST. AGI
The assemblage of drill rods, core barrel and bit or drill rods, drill
collars, and bit in a borehole, which is connected to and rotated by the
drill machine on the surface at the collar of the borehole. Also called
drill stem. See also:string
See:bit load
a. Oil reservoir set to discharge lubricant at steady rate in drops per
minute. Pryor, 3
b. Reagent feeder sometimes used in flotation process to meter chemicals
into pulp. Pryor, 3
A fault down which small quantities of water seep into mine workings. A
dripping fault is a hazard, as mining operations may loosen or open it and
cause an inrush of water. Nelson
A general term for any cave deposit of calcite or other mineral formed by
dripping water, including stalactites and stalagmites.
See also:cave onyx; dropstone.
A general term for a roadway, heading, or tunnel in course of
construction. It may be horizontal or inclined but not vertical.
Nelson
a. To excavate horizontally, or at an inclination, as in a drift, adit, or
entry. Distinguished from sinking and raising.
b. A tunnel or level in or parallel to and near a mineralized lode or
vein, as distinct from a crosscut, which only gives access normal to the
lode. Pryor, 3
c. An underground passage for exploration, development, or working of an
orebody. Nelson
d. To advance or sink drive pipe or casing through overburden or broken
rock formation by chopping, washing, or hammering with a drive hammer or
by a combination of all three procedures. Long
See:pipe drivehead
a. The driving mechanism for a conveyor. The expressions head-end drive,
intermediate drive, and tail-end drive, indicate the position of the
drivehead or heads. Nelson
b. A heavy iron cap or angular coupling fitted to top of pipe or casing to
receive and protect the casing from the blow delivered by a drive block
when casing or pipe is driven through overburden or other material. Also
called drive cap; driving cap. Syn:pipe drivehead; drive collar.
Long
c. The swivel head of a diamond- or rotary-drill machine. Long
a. A thick-walled outside-coupled pipe, fitted at its lower end with a
sharp steel shoe. It may be driven through overburden or other material by
repeated pile-driverlike blows delivered to the upper end of the pipe by a
heavy drive block. Long
b. Casing pipe driven into deep drill hole to hold back water or prevent
caving. In shallow drilling of alluvials, bottom pipe of string that may
be battered down. Drivehead and drive shoe are also used in this work.
Pryor, 3
c. Pipe driven short distance into dumps or unconsolidated ground to
obtain samples. See also:conduit
a. A heavy sleevelike device attached to a drill floor to steady and guide
the pipe or casing being driven. Long
b. A device for holding the drivepipe while being pulled from well.
Fay
A dry sample of soft rock material, such as clay, soil, sand, etc.,
obtained by forcing, without rotation, a short, tubular device into the
formation being sampled by hydraulic pressure or the piledriver action of
a drive hammer. Long
A short tubelike device designed to be forced, without rotation, into soft
rock or rock material, such as clay, sand, or gravel, by hydraulic
pressure or the piledriver action of a drive hammer to procure samples of
material in as nearly an undisturbed state as possible.
CF:piston sampler
The act or process of obtaining dry samples of soft rock material by
forcing, without rotation, a tubular device into the material being
sampled by pressure generated hydraulically, mechanically, or by the
piledriver action of a drive hammer. Long
a. Main driving shaft on which the drive and conveyor sprocket wheels or
pulleys are mounted. This shaft is connected to the drive unit through a
coupling, sprocket wheel, gear, or other form of mechanical power
transmission.
b. A shaft used to support the end of a conveyor screw in a trough end and
as a driving connection between a conveyor screw and the power
transmitting medium.