In glassmaking, a small opening over pots enabling workers to introduce or
withdraw material required.
Mining toward the main shaft while extracting ore or coal, such as in
longwall retreating. See also:longwall
The operator's mineral ownership involving the costs of drilling,
completion, equipment, and producing in contrast to the (free) royalty
interest. Wheeler, R.R.
Any combination of radon daughters in one liter of air that result in the
ultimate emission of 1.3 X 105 million electrons volts (MeV) of
alpha energy. NSC, 2
The maximum weight a hoist line or other rope or cable can carry under
working conditions without danger of straining. Long
A pump is said to be working on air when air is sucked up with the water.
Fay
The eroding or corroding of blast furnace linings. Fay
Mining away from the main shaft while extracting ore or coal, such as in
longwall advancing. See also:advancing
A mine shaft through which ore and miners are carried, as distinguished
from one used only in pumping. Standard, 2
a. A place in a mine at which coal or ore is actually being mined.
See also:working face
b. A miner's room or chamber. Hudson
Generally the space between the working face and the area being
backfilled. Stoces
a. Any area of development; usually restricted in meaning to apply to
breasts, etc., in contradistinction to gangways and airways. Often used in
a broader sense to mean all underground developments. See also:working
Fay
b. The entire system of openings in a mine. Typical usage restricts the
term to the area where coal, ore, or mineral is actually being mined.
Nelson
c. Colloquial term for an anthracite mining operation. Korson
All areas of a coal mine from the loading point of the section to and
including the working faces. FR 95
a. The stress considered to be a safe maximum for a particular material
under ordinary conditions. See also:yield stress; load factor.
Hammond
b. The maximum unit stress to which the parts of a structure are to be
subjected. Zern
c. See:allowable stress
The extraction of coal pillars in a pillar method of mining.
See also:pillar extraction; broken working; second working;
robbing pillars. Nelson
The driving of the narrow coal headings to form pillars in a pillar method
of working. Nelson
a. Impure pig lead that is to be desilverized or refined.
See also:base bullion
b. The electrical conductor connecting the source of arc welding current
to the work. Also called welding ground; ground lead. ASM, 1
A measure of the protection provided in the workplace by a properly
functioning respirator when correctly worn and used. NIOSH
A board or small platform placed at a suitable height in a drill tripod or
derrick so that a worker standing on it can handle the drill rod stands.
Long
A shaft that is in daily use for hoisting coal, ore, or miners.
See also:air shaft
A plate in the bottom of a blast hearth or ore hearth having a groove down
its center for conducting away the molten lead. Standard, 2