A sheetlike accumulation of combustible gases under the roof of a mine
roadway where the ventilation is too sluggish to dilute and remove the
gas. Although the term is new, the hazard existed since the earliest days
of coal mining. A combustible gases layer may be specified as one in which
the gas is 5% or over and of a length greater than the width of the road
in which it occurs. See:pocket of gas
See also:stratification of methane
See:tasmanite
The action or operation of burning; the continuous combination of a
substance with certain elements, such as oxygen or chlorine; e.g.,
accompanied by the generation of light and heat.
See also:ignition temperature
A flat or curved refractory roof over a furnace to promote combustion by
reflection of heat. AISI
An engineer with practical training and knowledge of all kinds of fuels
and their combustion characteristics. In general, the engineer lacks the
technical qualifications of the fuel technologist. Nelson
A method for the quantitative determination of certain elements (such as
carbon, hydrogen, and nitrogen) in organic compounds by combustion.
Webster 3rd
Softish stone occurring in the roof of a coal seam; it easily falls when
coal is removed. Syn:comb dung
A sodic rhyolite containing alkalic amphibole and/or pyroxene.
To withdraw or hoist the drill string or tools from a borehole.
Long
The constant or regular flow of water in a mine proceeding from old
workings or from water-bearing rocks.
Air conditioning that controls the atmosphere that human beings breathe.
Hartman, 2
Eng. Common terms used by miners for the word basset, or outcrop. Also
coming up today.
Lower Cambrian. AGI
A deposit of oil, gas, or other minerals in sufficient quantity for
production in paying quantities. Williams
Explosives designed, produced, and used for commercial or industrial
applications rather than for military purposes. Meyer
A general term for a decorative building stone that is hard and
crystalline. It may be a granite, gneiss, syenite, monzonite,
granodiorite, anorthosite, or larvikite. See also:black granite
AGI
A statistical term referring to saleable coal, less colliery consumption
and coal supplied to employees. BS, 4
A crystalline rock composed predominantly of one or more of the following
minerals: calcite, dolomite, or serpentine, and capable of being polished.
A mine operated to supply purchasers in general as contrasted with a
captive mine. Zern
Can. Mineralized material currently profitable at prevailing prices.
Hoffman
A quantity of oil, gas, or other minerals sufficient for production in
paying quantities. Williams