A small diamond- or other-type rock drill mounted on a bar and used in an
underground workplace. Also called bar and used in an underground workbar
rig. Long
a. To cut coal by hand; to hole by hand. Mason
b. The uncased portion of borehole. Also called called barefoot; blank;
naked; open; open hole. See also:blank hole
c. To remove overburden. Arkell
d. Eng. To strip or cut by the side of a fault, boundary, etc.; to make
bare.
Said of an oil well without a liner in the oil-bearing rock.
See also:blank hole
A motor without a pulley, belt-tightening base, or slide rails.
NEMA, 2
Colom. In placer mining, to extract as much of the pay gravel as possible,
without method, leaving the overburden untouched.
Colom. Extracting the rich ore by crude means.
Colom. A placer miner who uses crude methods of alluvial washing. A
spoiler.
A worker who removes surface soil or overburdens in a quarry.
Arkell
N. of Eng. The Saturday on which wages are not paid.
See:drag-chain conveyor; flight conveyor.
In the quarry industry, a laborer who controls the movement of a barge in
a river as it is loaded with crushed rock. DOT
Scot. Sheets of iron, zinc, or wood, used in wet shafts or workings for
diverting the water to one side.
A series of spaced bars, rails, pipes, or other members used for rough
sizing of bulk material passed across it to allow smaller pieces to drop
through the spaces. See also:grizzly
An impure sodium carbonate and sulfate obtained by burning various species
of land or marine plants; soda ash. See also:copper barilla; coro-coro.
Standard, 2
a. The small coal made in undercutting coal seams. Webster 3rd
b. A making bare; an uncovering. See also:strip
c. The surface soil and useless strata overlying a seam of coal, clay,
ironstone, etc., that have to be removed preparatory to working the
mineral. See:overburden
a. An orthorhombic mineral, 4[BaSO4 ] ; has nearly pseudocubic
cleavage; occurs as interpenetrant masses of crystals with sand and clay
(desert roses); sp gr, 4.5; in veins or in residual masses on limestone;
the principal source of barium. Syn:barytes; dreelite; heavy spar;
cawk.
b. The mineral group anglesite, barite, and celestine.
See:petrified rose
A silvery-white, metallic element, belonging to the alkaline earth group.
Symbol, Ba. Found chiefly in barite or heavy spar and witherite. All
barium compounds that are water or acid soluble are poisonous. Used in
paint, X-ray diagnostic work, glassmaking, oilwell drilling fluids, and
pyrotechny. Handbook of Chemistry and Physics, 3
See:paracelsian
Observed result of magnetizing a ferromagnetic substance by means of a
slow magnetic field increase. Orientation of domains proceeds in abrupt
steps. Pryor, 3
A stream size of anthracite known also as buckwheat No. 3, sized on a
round punched plate. It passes through 1/4-in (6.4-mm) holes. At some
mines, it has to pass over 3/32-in (2.4-mm) holes and at others over
1/16-in (1.6-mm) holes. The American Society of Mechanical Engineers has
recommended that with a screen with circular holes, barley shall pass
through 3/16-in (4.8-mm) holes and pass over 3/32-in holes.
See also:anthracite coal sizes; bird's-eye. Fay