A member of a team responsible for advancing the face conveyor as the coal
is worked away. In many modern layouts, the armored conveyor is pushed
forward by hydraulic rams. Nelson
The path, parallel to the face, occupied by a longwall conveyor. The track
is advanced every turnover. Syn:track
See:tripper man
Any conveyor, such as apron, belt, chain, flight, pan, oscillating, screw,
or vibrating, adapted for feeder service. See also:apron feeder
A monoclinic mineral, LiAl4 (Si3 Al)O10 (OH)8;
chlorite group.
An opening of truncated-cone shape in the tuyere breast of furnace. The
tuyere cooler is placed in it. Fay
Coolers in which atmospheric air is blown by a fan, through a nest of
pipes, into a tower or chamber in which it comes into intimate contact
with fine particles of water from atomizing nozzles. By the evaporation of
some of this water the air rapidly becomes saturated at the wet-bulb
temperature, the remaining water running off at the same temperature. This
water is collected and pumped back through the nest of pipes, thereby
cooling the air before it enters the spray chamber. The entering air then
has a lower dry-bulb temperature than the atmosphere and, since its
moisture content is unaltered, the wet-bulb is lower also.
Spalding
A chemical added to an explosive during manufacture to suppress or inhibit
the flame produced in blasting. BS, 12
A floor upon which hot ore is placed for the purpose of cooling.
The total amount of sensible and latent heat to be removed from a space to
maintain desired conditions. For mines in operation, it is possible to
measure the actual amount of heat generated in underground openings by
observing temperature changes in a known weight flow rate of mine air. For
projected mines and extensions of operating mines, the amount of heat
produced must be calculated, knowing which of the sources of underground
heat is operative. Hartman, 2
The rate at which air will remove heat from a body and may be measured dry
or wet. The cooling power of air, as determined by the kata thermometer,
is one of the basic environmental standards. Hartman, 2
Banded ore consisting mainly of fluorite and sphalerite in alternate
light- and dark-colored layers; occurs in the Cave-in-Rock district of
southern Illinois.
A tetragonal mineral, (Pt,Pd,Ni)S ; sp gr, 9; in ultramafic
rocks, such as the Bushveld, Transvaal, South Africa; an ore of platinum
and palladium.
An anastomosing meshwork of minute curved and branching lines produced in
rock by shearing under pressure. Goldman
Any one of a set of numbers designating linear and/or angular quantities
that specify the position of a point on a line, in space, or on a given
plane or other surface in relation to a given reference system; e.g.,
latitude and longitude are coordinates of a point on the Earth's surface.
The term is usually used in the plural, esp. to designate the particular
kind of reference system (such as spherical coordinates, plane
coordinates, and polar coordinates). AGI
Crystallographers customarily use a right-handed system with the z axis
oriented positive upward, the y axis positive to the right, and the x axis
positive toward the viewer. CF:axis; crystallographic axes.
a. Elastic, bituminous substances derived from algae.
Schieferdecker
b. A boghead coal in the peat stage. See also:elaterite
Stutzer
Lean; said of ores. Hess
An inclusive term for a wide variety of hard, brittle, semitransparent,
yellowish to red fossil resins from various tropical trees (e.g.,
Copiafera and Agathis), being nearly insoluble in the ordinary solvents
and resembling amber in appearance; e.g., Congo copal and kauri. Copal
also occurs as modern resinous exudations. Syn:gum copal
See also:amber
See:copalite
An oxygenated hydrocarbon resembling copal from the blue clay of Highgate,
near London, England. Syn:copaline; fossil copal.