a. The part of an ore deposit that is too low in grade to be of economic
value at the time of mining, but which may be stored separately for
possible treatment later. Lewis
b. Refuse and impurities removed in mining and treating coal; also, the
coal left in a mine as pillars.
c. Gangue.
d. Tailings.
e. Overburden.
f. The refuse from ore dressing and smelting plants. Gob; goaf; old
workings; also, the fine coal made in mining and preparing coal for
market; culm; coal dirt; also used to signify both the mine waste (such as
coal left in pillars) and the breaker waste.
g. A working or shaft which has been abandoned and filled with refuse
(goaf or gob), or with material from the fall of the hanging wall.
Syn:condie
h. See:spoil
On some coal faces, the stone overlying the seam does not always fall in
the wastes after withdrawing the supports. To avoid excessive weight on
the face, which would cause dangerous roof conditions, it is desirable to
blast down the stone in the wastes. Also, in thick seams, the overlying
strata requires breaking down to provide sufficient stone for building
packs. The holes for waste shots must be drilled from the face side so
that the driller is working under a supported roof. Care must be taken to
ensure that the holes are not drilled up into the solid strata and that
the burden on the shot is not excessive. McAdam, 2
The controlled leakage of air through a waste to ensure that large
concentrations of mine gases do not accumulate in it. BS, 8
The area where mine waste or spoil materials are disposed of or piled.
A row of rigid timber or steel props or chocks set along the edge of the
waste and parallel to the longwall face to induce the roof beds to break
and to secure caving of the waste area. See also:breaker props
Nelson
In these methods, support for walls and for workers and machines is
furnished by waste rock, tailing sand, etc., called filling or gob. In
true waste filling, the orebody is excavated in sections alternating with
filling, and it is sometimes referred to as cut-and-fill stoping.
Higham
Material used for support in heavy ground and in large stopes to prevent
failure of rock walls and to minimize or control subsidence and to make it
possible to extract pillars of ore left in the earlier stages of mining.
Material used for filling includes waste rock sorted in the stopes or
mined from rock walls, mill tailing, sand and gravel, smelter slag, and
rock from surface open cuts or quarries. Lewis
A boiler that uses the heat of exit gases from furnaces to produce steam
or to heat water. Pryor, 3
In anthracite and bituminous coal mining, a laborer who looks after and
keeps clean the airways, haulageways, or working places of a mine. Also
called cleanup man; dirt shoveler; sweeper. See also:jerry man
DOT
a. Tinplate below the standard weight and quality. Standard, 2
b. Spoiled or imperfect casting or machined part that must be discarded
although partly processed. Pryor, 3
c. A brick, structural or refractory, that is defective as drawn from the
kiln; wasters in the refractories industry are crushed and reused as grog.
Dodd
An excavation in a mine in which barren rock and other material is broken
up for use as filling at the stope. Stoces
Barren or submarginal rock or ore that has been mined, but is not of
sufficient value to warrant treatment and is therefore removed ahead of
the milling processes. Pryor, 4
The unfilled or unpacked portions of workings in a mine. TIME
Excess water allowed to run to waste from the water circuit. BS, 5
a. A channel for carrying off superfluous water. Webster 3rd
b. The channel required to convey water discharged into it from a
spillway, escape, or sluice; a spillway. Seelye, 1
Property (as mines or lumber tracts) subject to depletion.
Webster 3rd
Eng. A tract of wasteland, or any waste material. Fay
Weak coal pillars left in workings to give warning of an impending
collapse. Briggs
a. Clear, colorless liquid.
b. A rarely used term referring to the color and clarity of a precious
stone or pearl, and esp. of a diamond. AGI
A fire-resistant plastic container of water that is used as a safety
precaution in shotholes. BS, 12
A water cartridge for stemming shotholes in coal or rock. The ampul
consists of a plastic (polyvinylchloride) bag, 1-1/4 in (3.2 cm) in
diameter and 18 in (45.7 cm) in length. When filled with water and the
neck of the bag tied off, the filled ampul is about 15 in (38.1 cm) in
length and holds slightly over 1/2 pint (0.24 L) of water. Compared with
dry clay or sand, the use of water ampuls for stemming effects substantial
reductions in both the airborne dust and the nitrous fumes produced by
shot firing. This applies to both coal and rock blasting. Also called a
water dummy. Syn:cushion firing