In bituminous coal mining, one who operates a small electric haulage
locomotive to haul mine cars underground and at the surface of a mine.
DOT
Usually has a built-in gasoline engine as prime mover, flushing being
provided by the exhaust gases or by compressed air produced in the
machine. Total weight varies between 50 lb and 120 lb (22.7 kg and 54.4
kg). Motor hammer drills are used for odd-job operations, on forest roads,
in prospecting, etc., where it is not worthwhile to lay air supply lines
on account of transport difficulties or insufficient volume of work.
Fraenkel
See:grader
The person who operates a haulage locomotive. Jones, 1
The spotted, blotched, or variegated appearance of any mottled surface,
such as of wood or marble; esp., in metallurgy, the appearance of pig iron
of a quality between white and gray. Standard, 2
Pig iron in which the majority of the carbon is combined with iron in the
form of cementite, Fe3 C , but in which there is also a small
amount of graphite. The fractured pig has a white crystalline fracture
with clusters of dark spots, indicating the presence of graphite.
See also:gray iron
Limestone with narrow branching fucoidallike, cylindrical masses of
dolomite, often with a central tube or hole; a variegated limestone. It
may be organic or inorganic in origin.
A silica brick having harmless areas of dark cream to reddish brown.
Slate in which blotches of red or purplish colors appear on a generally
green surface; ascribed chiefly to different forms of iron oxide.
Discontinuous lumps, tubes, pods, and pockets of a sediment, randomly
enclosed in a matrix of contrasting textures, and usually formed by the
filling of animal borings and burrows). AGI
An orthorhombic mineral, PbCu(VO4 )(OH) ; descloizite group; zinc
replaces copper toward descloizite; conchoidal fracture; a supergene
mineral associated with base-metal deposits. Formerly called
cuprodescloizite, psittacinite.
Limonite or brown iron ore. A local name applied in Virginia to the
low-grade siliceous variety, which commonly occurs in hard lumps and is
found on the mountain slopes at or near the contact of the Cambrian shale
and sandstone with the Cambro-Ordovician limestone.
CF:valley brown ore
See:orogeny
A complex, connected series of several more or less parallel mountain
ranges and mountain systems grouped together without regard to similarity
of form, structure, and origin, but having a general longitudinal
arrangement or well-defined trend; e.g., the Mediterranean mountain chain
of southern Europe. See also:cordillera
AGI
a. A white or gray variety of asbestos consisting of thick interlaced
fibers and resembling cork in texture and lightness (it floats on water).
Syn:rock cork; mountain leather.
b. A fibrous clay mineral such as sepiolite or palygorskite.
A fine silky asbestos.
A monoclinic mineral, (Ca,Na2 ,K2 )2 Si4 O
10 .3H2 O ; zeolitelike; white; fibrous.
See also:rhodesite
a. A tough variety of asbestos occurring in thin flexible sheets made of
interlaced fibers. Syn:rock leather; mountain cork; mountain paper.
b. A fibrous clay mineral such as sepiolite or palygorskite.
Syn:leatherstone
See:diatomite
A very soft, spongy variety of calcite. Standard, 2