A pit bottom layout in which the loaded cars are fed to the cage from one
side only and the empties are returned to the same side by means of a loop
roadway. The loop arrangement provides more standage room for cars and is
more suitable for multideck cages. When the coal reaches the pit bottom
from two sides, a double-loop layout may be adopted. Nelson
A double-track loop in a main single-track haulage plane at which mine
cars may pass. A loopway located close to the face or loading machine
enables a train of empty cars to be stationed in the loop, while the
loaded cars are run straight out on the main single track. Nelson
Loose, or crick, is a vertical joint affecting only the lower strata in a
oolite quarry, Northamptonshire, U.K. Syn:crick
a. A gangway in longwall working, driven so that one side is solid ground
while the other opens upon old workings. CF:fast end
b. Coal prepared by cutting, or that coal that is certain to be loosened
by a shot. Fay
c. The limit of a stall next to the goaf, or where the adjoining stall is
in advance. Fay
Industrial diamonds as purchased from a diamond supplier in bulk.
CF:loose stone
a. Broken, fragmented, or loosely cemented bedrock material that tends to
slough from sidewalls into a borehole. Also called broken ground.
CF:breccia
b. As used by miners, rock that must be barred down to make an underground
workplace safe; also fragmented or weak rock in which underground openings
cannot be held open unless artificially supported, as with timber sets and
lagging. CF:broken ground
c. A shattered rock formation, or a formation crisscrossed with numerous,
closely spaced, uncemented joints and cracks. Long
A method of traversing in which the magnetic bearings of survey lines are
separately obtained by reference to the magnetic needle. BS, 7
An implement for loosening a pattern from a sand mold. Standard, 2
Aust. Rails that can be lifted and placed across a permanent line when
desired to run skips across it. Fay
See:loose ground
Vertical joints affecting only the lower strata in the ooelite quarries,
Northamptonshire, U.K. Also called cricks.
a. A diamond insecurely bonded in a bit matrix. Long
b. A diamond detached from a bit and lying on the bottom of a drill hole.
Long
c. An unset industrial diamond. CF:loose goods
Measurement of soil or rock after it has been loosened by digging or
blasting. Nichols, 1
S. Staff. Lowering a cage, etc., into a shaft or pit. Fay
A possibly orthorhombic mineral, (Ce,Na,Ca)2 (Ti,Nb)2 O (sub
6) ; perovskite group; pseudocubic; Kola Peninsula, Russia.
A triclinic mineral, K2 Cr2 O7 ; forms minute
orange-red balls in nitratine in Chile.
A large, concordant, typically layered igneous intrusion, of planoconvex
or lenticular shape, that is sunken in its central part owing to sagging
of the underlying country rock. Syn:funnel intrusion
Any of various long-range radio position-fixing systems by which
hyperbolic lines of position are determined by measuring the difference in
arrival times of synchronized pulse signals from two or more fixed
transmitting radio stations of known geographic position. Loran fixes may
be obtained at a range of 1,400 nmi (2,593 km) at night. CF:shoran
Etymol: long-range navigation. AGI
A monoclinic mineral, TlAsS2 ; red; forms modified tabular or
prismatic crystals with one perfect cleavage.
A mineral, (Y,Ce,Ca)ZrTaO6 (?).
A tetragonal artifact, Pb7 O6 Cl2 .