A board with projecting dowels or pipe fingers located in the upper part
of the drill derrick or tripod to support stands of drill rod, drill pipe,
or casing. CF:finger
Steel rails hinged independently over an ore chute, to control rate of
flow of rock. Pryor, 3
A finishing tool designed to recover a broken drill rod or dropped tool
from a borehole. Long
A basket-type core lifter. Long
Steeply sloping openings permitting caved ore to flow down raises through
grizzlies to chutes on the haulage level.
Steel that has been processed beyond the stages of billets, blooms, sheet
bars, slabs, and wire rods, and is ready for the market. ASM, 1
The final grade required by specifications. Nichols, 1
The jig used to save the smaller particles of ore in a concentrator.
Weed, 2
A type of refined hydrated lime, which has been milled to be suitable for
plastering, particularly a finish coat. Boynton
The last roll, or the one that does the finest crushing in ore dressing,
esp. in stage crushing. Fay
A frequently used symmetrical steel roof truss that is effective over a
maximum span of 50 ft (15.2 m). Hammond
A hexagonal mineral, Pb5 (AsO3 )3 Cl ; occurs as
prisms forming crusts lining crevices in granular hematite at Laangban,
Sweden.
A white marble with veins and clouds of purple or red, from Albania.
Fay
Siliceous sinter, named from Mount Santa Fiora, Tuscany, Italy.
Syn:pearl sinter
a. To explode or blow up. The expression "the pit has fired" signifies
that an explosion of combustible gases has taken place. Fay
b. To blast or explode with ammonium nitrate-fuel oil (ANFO), dynamite, or
other explosive.
c. A word shouted by miners as warning just before a shot is fired.
Fay
d. Fuel in a state of combustion, as on a hearth, in a grate, or furnace.
A manifestation of rapid combustion or combination of materials with
oxygen.
e. Flashes of different spectral colors seen in diamonds and other
gemstones with high birefringence as a result of dispersion.
CF:play of color
See:goldstone
The assaying of metallic ores, usually gold and silver, by methods
requiring a furnace heat; commonly involves the processes of
scorification, cupellation, etc. Standard, 2
The back wall of a furnace or fireplace. Fay
The spoil heap at the surface of a colliery, when burning or heated by
spontaneous combustion. Nelson
See:pyrostilpnite
a. A person designated to examine the mine for gas and other dangers. In
certain states, the fire boss is designated as the mine examiner.
See also:gasman
b. A State-certified supervisory mine official who examines the mine for
combustible gases and other dangers before a shift comes into it and who
usually makes a second examination during the shift; in some States, it is
used loosely to designate assistant or section foreman.
See also:fireman
c. Also called examiner; mine examiner. See:gas watchman