A bucket widely used in sampling sea-floor rock deposits in all depths up
to and exceeding 30,000 ft (9.1 km). See also:drag dredging
Mero
In a dragline or hoe, the line that pulls the bucket toward the shovel.
Nichols, 1
A type of conveyor having one or more endless chains that drag bulk
materials in a trough. See also:chain conveyor; drag conveyor;
portable drag conveyor. Syn:bar flight conveyor
Inclined trough that receives ore pulp, and classifies it into settling
solids and relatively fine pulp overflow. The settled material is
continuously dragged up slope and out by a continuous belt, perhaps
provided with transverse scrapers. Pryor, 3
A conveyor in which an endless chain, having wide links carrying
projections or wings, is dragged through a trough into which the material
to be conveyed is fed; it is used for loose material.
See also:chain conveyor
a. A cut on which groups of holes are drilled at increasing heights above
floor level and at increasing angles from the free face. The shots are
fired to break out successive wedges of strata across the width of the
face. BS, 12
b. A drill-hole pattern widely used in high-speed drilling. The cut holes
are inclined downward to cut a wedge along the floor, the other holes
being drilled to break to the cut holes. Also called horizontal cut.
Nelson
c. A cut in which the cut holes are angled in the vertical plane toward a
parting in order to breakout the ground along the parting. Drag cut rounds
are suitable for small drifts 6 to 7 ft (1.83 to 2.13 m) wide or where
shallow pulls are sufficient, but the drag cut does not find much
application in large-scale drifting practice. See also:bottom cut
McAdam, 2
Local change of attitude as a result of drag near a fault.
A method in which the bucket is lowered to the sea floor and dragged over
the ocean floor for some distance in order to collect samples. Dredge and
trawl hauls normally can only give a rough indication of heavy or light
concentrations of the minerals within an area. Mero
See:slope engineer
A minor fold, usually one of a series, formed in an incompetent bed lying
between more competent beds, produced by movement of the competent beds in
opposite directions relative to one another. Drag folds may also develop
beneath a thrust sheet. They are usually a centimeter to a few meters in
size. AGI
The underwater end of a hydraulic dredging system that comes in contact
with bottom sediments and through which a dredge pump recovers a slurry of
water and sediment. Padan
A type of excavating equipment that casts a rope-hung bucket a
considerable distance; collects the dug material by pulling the bucket
toward itself on the ground with a second rope; elevates the bucket; and
dumps the material on a spoil bank, in a hopper, or on a pile.
See also:boom; excavator.
A crane boom used with a drag bucket. Carson, 1
An excavation system involving a digging bucket, cable, and boom, which
permits the recovery of sediments and rocks from trenches, canals, and
pits that contain or are covered by water.
See:slope engineer
A mechanical excavating appliance consisting of a steel scoop bucket that
is suspended from a movable jib; after biting into the material to be
excavated, it is dragged toward the machine by means of a wire rope.
CTD
An apparatus for moving soil, gravel, or other loose material. It
ordinarily consists of a scraper attached to an endless cable or belt
operated by a drum or sprocket wheel, and can be drawn back and forth by
the operator at the drum.
See:dragman
One who operates a scraper loading machine, known as a drag, to load ore
into cars or chutes. Also called drag loader; drag operator. DOT
S. Staff. A barrel in which water is raised from a shallow shaft.
A rounded quartz pebble representing a quartz crystal that has lost its
brilliancy and angular form; in gravels, once believed to be a fabulous
stone obtained from the head of a flying dragon.