Said of the holocrystalline-porphyritic texture exhibited by lamprophyres,
in which phenocrysts of mafic minerals are contained in a fine-grained
crystalline groundmass. AGI
Metamorphosed lamprophyre with a schistose structure containing brown
biotite and green hornblende. AGI
a. Fixed places in the intake airway of a coal mine where the miners'
safety lamps are externally examined by a deputy before the workers
proceed to their working places. In a safety lamp mine, the lamp station
is the only place where flame safety lamps may be opened and relighted.
Nelson
b. Locations in gaseous mines where safety lamps are opened, cleaned, and
refilled or charged by a qualified attendant. Hudson
c. A place underground, appointed for the examination, by an official, of
safety lamps in use. BS, 13
d. A lamp room. Fay
A subdivision of the Coal Measures--based mainly on plant fossils. It
represents in part, the millstone grit of South Wales; well developed in
South Scotland, where coal seams are present. Nelson
A monoclinic mineral, Pb2 (SO4 )O ; perfect basal cleavage;
named for Lanarkshire, Scotland.
Lancashire bord-and-pillar system
A method of working moderately inclined coal seams. The first stage
consists of splitting a panel of coal into pillars and as a second stage
the pillars are extracted on the retreat by a longwall face.
Nelson
A short sluice used for cleaning tin concentrate. Hess
a. To set or allow the bottom end of a drivepipe or casing to rest at a
preselected horizon in a borehole. Long
b. For reamers, drills, and taps, the solid section between the flutes.
ASM, 1
Reclamation of land from the sea or other low-lying or flooded areas by
draining and pumping, dumping of fill, or planting of marine vegetation.
AGI
A surveyor's chain of 100 links.
A surveyor's compass.
a. A worker stationed at one of the levels of a mine shaft to unload rock
from the bucket or cage and load drilling and blasting supplies to be
lowered to the crew. Webster 3rd
b. In the quarry industry, one who supervises and assists in guiding,
steadying, and loading, on trucks or railroad cars, blocks of stone
hoisted from the quarry floor. Syn:top hooker
c. In metal mining, a laborer who (1) cleans skips by directing a blast of
compressed air into them through a hose; (2) records number of loaded
skips hoisted to surface; and (3) loads railroad cars with ore from bins
by raising and lowering chute doors. DOT
d. In anthracite coal mining, bituminous coal mining, or metal mining, one
who works with shaft sinking crew at top of shaft or at a level
immediately above shaft bottom, dumping rock into mine cars from a bucket
in which it is raised. Also called bucket dumper; landing tender; top
lander. DOT
e. Eng. The person who receives the loaded bucket or tub at the mouth of
the shaft. Also called banksman. Fay
A pink or rose variety of grossular in dodecahedra. Syn:rosolite;
xalostocite.
An orthorhombic mineral, (Mn,Mg)9 Fe3 (PO4 )8
(OH)3 .9H2 O .
Any physical, recognizable form or feature of the Earth's surface, having
a characteristic shape, and produced by natural causes; it includes major
forms such as plain, plateau, and mountain, and minor forms such as hill,
valley, slope, esker, and dune. Taken together, landforms make up the
surface configuration of the Earth. Syn:relief feature
A group of related natural features, objects, or forces; e.g., a drainage
system or a mountain system. See also:mountain system
a. The top or bottom of a slope, shaft, or inclined plane. Fay
b. The mouth of a shaft where the cages are unloaded; any point in the
shaft at which the cage can be loaded with people or materials.
Nelson
c. The brow or level section at the top of an inclined haulage plane where
the loaded tubs are exchanged for empty tubs, or vice versa.
See also:apex
d. A preselected and prepared horizon in a borehole on or at which the
bottom end of a drivepipe or casing string is to be set. Long
e. A platform from which to charge a furnace. Standard, 2
f. Level stage in a shaft at which cages are loaded and discharged.
Pryor, 3
Scot. The box into which a pump delivers water. Fay
S. Wales. A shaft through which coal is raised. Fay
See:lander