The highest rock formation of the Millstone Grit of South Wales, occurring
immediately beneath the Coal Measures. Since all workable coal seams occur
in the Coal Measures, it is useless to search for coal in these rocks,
hence the miner's term. Nelson
Method of case-hardening iron by use of ammonium chloride, manganese
dioxide, and potassium ferrocyanide. Pryor, 3
A monoclinic mineral, Mg3 (PO4 )2 , with iron and
silicon present; colorless, wax-white, or yellow; peripheral to olivine
nodules in the Springwater pallasite meteorite discovered near
Springwater, SK, Canada.
A schist with elongated ferromagnesian minerals lying in a plane but
otherwise unoriented. Knopf
Gemstone that has been cut and polished.
Dark-red to brownish-red pyrope garnet from Tanzania, the clear blood-red
specimens used as gems.
a. See:augite
b. Ferrian aluminian diopside or augite.
Igniter cord consisting of three central paper strings coated with a black
powder composition and held together with cotton countering. These are
then enclosed in an extruded layer of plastic incendiary composition and
finished with an outer plastic covering. The overall diameter of fast
igniter cord is approximateiy 0.10 in (2.5 mm). McAdam, 2
Solid or undisturbed rock. Syn:fast ground
A loosely applied term for any method for the firing of blasts involving
the use of the blasting timer or millisecond-delay caps.
Streefkerk
a. The part of the coalbed next to the rock. Fay
b. A gangway with rock on both sides. See also:loose end
c. The limit of a stall in one direction, or where the face line of the
adjoining stall is not up to or level with, nor in advance of, it.
Fay
See:fast gear
See:fast gear
a. As used by drillers in referring to the feed gears in a gear-feed
swivel head, the pair of gears installed in the head that produces the
greatest amount of bit advance per revolution of the drill stem. Also
called fast feed; high feed. Long
b. As used by drillers in referring to the speed at which the drill motor
rotates the drill stem or hoist drum, the transmission gear position
giving the fastest rotation per engine revolutions per minute.
Long
See:fast country
See:junking
That portion of the cable or wire line, reeved through a block and tackle,
that runs from the stationary block to the hoisting drum on a drill
machine. CF:deadline
Dynamite or other explosive having a high-speed detonation.
Nichols, 1
a. The rock adjoining the coal. Arkell
b. The end of the face where there is a solid face more or less at right
angles. Mason
A cohesive and compressible clay of high plasticity, containing a high
proportion of minerals that make it greasy to the feel. It is difficult to
work when damp, but strong when dry. CF:lean clay
AGI
A continuous profile of the depth obtained by echo soundings. AGI