a. The process of building a set of barriers to isolate a sufficient
quantity of good air to protect mine workers from the asphyxiating gases
formed after a fire or explosion. Miners wait behind the barrier until
rescued. Used as an alternative to an escape attempt.
b. An artificial mound of earth, usually as high as the eaves of a
magazine roof, that is erected to deflect the force of an explosion upward
and to protect the enclosed building from flying objects.
c. Timber formwork to contain the material during hydraulic flushing in
steep ore workings. Nelson
Blocks of coal left between the workings of different mine owners and
within those of a particular mine for safety and the reduction of
operational costs. It helps to prevent disasters of inundation by water,
of explosions, or fire involving an adjacent mine or another part of a
mine and to prevent water running from one mine to another or from one
section to another of the same mine. See also:barrier pillar
Mason
Eng. See:tailgate
Materials such as lead and concrete that are used for protection from
X-rays or gamma rays in radiographic installations. Osborne
a. A solid block or rib of coal, etc., left unworked between two
collieries or mines for security against accidents arising from an influx
of water. See also:barrier; pillar; barrier pillar. Zern
b. Any large pillar entirely or relatively unbroken by roadways or airways
that is left around a property to protect it against water and squeezes
from adjacent property, or to protect the latter property in a similar
manner. Zern
c. Incorrectly used for a similar pillar left to protect a roadway or
airway, or group of roadways or airways, or a panel of rooms from a
squeeze. Zern
N. of Eng. An approved method of working a colliery by pillar and stall,
where solid ribs or barriers of coal are left in between working places.
Fay
A small diamond or other rock drill designed to be mounted and used on a
bar. Also called bar drill. Long
The end and side timber bars used for supporting a rectangular shaft. The
bars are notched into one another to form a rectangular set of timber.
Common sizes are from 9 to 12 in (23 to 30.5 cm) deep and from 3 to 6 in
(7.6 to 15.2 cm) thick and may be made from larch, white pine, or red
pine. See also:cribbing; steel rectangular shaft supports.
Nelson
a. Loosening ore in a bin by means of a bar, so it will flow through the
chute.
b. Prying off loose rock after blasting to prevent danger of fall.
Pryor, 1
A general term for the setting of bars of timber for supporting
underground roadways or shafts. Nelson
Prying adhering scrap metal from runners, ladles, or skimmers. Fay
A Spanish and South American term for clay, loam, marl, or the overburden
of alluvial gold deposits.
A dark green amphibole intermediate between hornblende and glaucophane.
English
a. A wicker basket in which salt is put to drain. Webster 2nd
b. A box with two handles at one end and a wheel at the other.
Zern
c. A vehicle in which ore, coal, etc., is wheeled; a push cart.
In mining, one who pushes shallow-bodied cars (barrows) or wheelbarrows
used for transporting coal or ore along underground haulageways that are
too low for ordinary mine cars. Also called buggyman. DOT
a. A level through which coal or ore is wheeled.
b. Rails laid between the flat or siding and the coal face. SMRB
See:eudialyte
See:grizzly
A method of timbering mine roadways by means of horizontal and upright
bars. See also:timber set
Solid, commercial tin. Bennett