A hydraulic classifier similar to a thickener, but differs in that the
current carries the fine material into the overflow; used to make
separations at very fine particle size.
See:boulder
See:saponite
A steel bowl hung within a fabricated steel frame, running on four or two
wheels. Its bottom edge digs into the ground, the bowl being filled as it
is drawn forward by a tractor; soil is ejected at the dump by a tailgate,
moved by wire ropes or hydraulically. Towed scrapers transport soil, in
addition to spreading and leveling it. See also:wheel scraper
Hammond
See:bort
See:boose
a. A unit in a sluice for washing gravel; a sluicebox.
Syn:box condenser
b. A dump body. Nichols, 1
c. To place core samples in a lidded, traylike, partitioned container for
safekeeping after they have been removed from the core barrel; also, the
container in which core samples are placed after they have been removed
from a core barrel. Also called corebox; core tray. Long
d. To drill boreholes at the four corners of a square area at equal
distances from a centrally located and already completed borehole.
Long
A large wheelbarrow with upright sides. Webster 2nd
See:bell screw
a. A narrow gorge or canyon containing a stream following a zigzag course,
characterized by high, steep rock walls and typically closed upstream with
a similar wall, giving the impression as viewed from its bottom of being
surrounded or boxed in by almost-vertical walls. AGI
b. A steep-walled canyon heading against a cliff; a dead-end canyon.
Syn:cajon
a. Any of several types of conveyors adapted by portable or hinged
mounting for use in loading bulk materials into boxcars. Some types
operate at high speeds and throw the materials to the ends of the car.
See also:idler disk
b. In anthracite and bituminous coal mining, one who loads coal into
railroad boxcars by mechanical shovel or conveyor loader.
Syn:thrower belt; car loader; loader engineer; loader runner.
See also:portable conveyor
A ventilation control consisting of a stopping or a curtain with a hole,
through which a conveyor can pass. The box check serves as a ventilation
regulator in a belt haulage entry. See also:boxes; conveyor airlock.
MSHA, 1
See:box
The initial cut driven in a property, where no open side exists; this
results in a highwall on both sides of the cut. Austin
A method of opencast mining of coal where the dip of the seam is
relatively steep. A boxlike excavation is made to the dip, or at an angle
to it, and the coal seam is worked to the right and left.
See also:strike working
That spoil created from the initial excavation of a pit or pits which is
placed upon the surface of adjacent lands. The term does not include spoil
from subsequent excavations, which is placed in previously excavated pits.
a. Pennsylvania. Wooden partitions for conducting the ventilation from
place to place. See also:box check
b. More or less hollow cuboidal limonitic concretions. Arkell
c. Eng. Pebbles of hard brown sandstone at the base of the Red and
Coralline Crags in East Anglia, containing remains of a fossil; so called
by the Suffolk phosphate diggers. Arkell
The use of metal trays, instead of shovels, for hand-filling coal into
trams. The collier scooped the lumpy coal into the box and discarded the
small material, which had little market value. The use of a box was
compulsory at many collieries until several decades ago.
See also:fork-filled; loading pan. Nelson
A closed groove between two rolls, formed by a collar on one roll and
fitting between collars on another. Fay
A heading driven through very loose ground with close timbering.
Nelson
A method of securing shafts solely by slabs and wooden pegs. Zern