See:setting out
See:winding rope
See:topography
a. The design or pattern of the main roadways and workings. The proper
layout of mine workings is the responsibility of the manager aided by the
planning department. Nelson
b. The map of a mine or part of a mine, usually including future workings
arrangement. BCI
c. Diagram showing disposition of machines in a mill's flow line.
Pryor, 3
Ordinary lay rope has the wires twisted in a direction opposite to the
twist of the strands in the rope. The pitch of wire is from 2-1/2 to 3
times the diameter of the rope, and the pitch of the strands is from 6-1/2
to 9 times the diameter of the rope, the wires being exposed only in short
lengths at intervals. Lewis
See:arsenosulvanite
See:lapis lazuli
a. A monoclinic mineral, 2[MgAl2 (PO4 )2 (OH)2
] ; forms a series with scorzalite; azure blue; in granite pegmatites and
quartz veins; may be a blue gemstone. Syn:azure spar; blue spar;
false lapis; berkeleyite; klaprothine. (Not lazurite.)
b. The mineral group barbosalite, hentschelite, lazulite, and scorzalite.
Of, pertaining to, or having the characteristics of lazulite.
Standard, 2
a. An isometric mineral, (Na,Ca)8 (Al,Si)12 (O,S)24
[(SO4 ),Cl2 ,(OH)2 ] of the sodalite group; deep blue
to greenish blue; a contact metamorphic product in limestone; may be a
blue gemstone (lapis lazuli). Also spelled lasurite. (Not lazulite.)
See also:Chilean lapis
b. See:azure; azurite.
a. Eng. A timber placed at the top of a hopper, against which the top of
the car strikes in dumping, to prevent the car from falling into the
hopper. Fay
b. Eng. The balk or girder held in position by a banger. Also called lazy
girder. SMRB
The bench to one side of the drill tripod or derrick floor where visitors
and workers can sit while observing the drilling operation. Long
See:lazy balk
Process in which oxygen is blown downwards at high velocity through a
watercooled lance onto the surface of the hot metal contained in a basic
lined vessel. To offset the intense heat produced, coolant materials are
added with the original charge. These may be iron ore, sinter, or roll
scale, but usually steel scrap is the main material used. As much as 26%
of scrap may be used. After about 20 min, the charge is converted into
liquid steel. During the process, tests and analyses are made and
materials may be added to bring the metal to the required grade and
temperature. See also:open-hearth process; O.L.P. steel process.
Nelson
A solution obtained by leaching; e.g., water that has percolated through
soil containing soluble substances and that contains certain amounts of
these substances in solution. Syn:lixivium
Low-grade ores that are dumped loosely in piles on soil surfaces so that
fluids may be sprinkled on the piles to leach recoverable metals.
SME, 1
The part of a lode above the water table, from which some ore has been
dissolved by down-filtering meteoric or spring water.
In ore dressing, smelting, and refining, one who dissolves valuable metal
out of ore or slime, using chemical solution. DOT
See:sinkhole
a. The separation, selective removal, or dissolving-out of soluble
constituents from a rock or orebody by the natural action of percolating
water. AGI
b. Dissolution from ore or concentrates after suitable comminution to
expose the valuable minerals, by aqueous and chemical attack. If heat and
pressure are used to intensify or speed this, the work is called pressure
leaching. See also:chemical extraction; hydrometallurgy.
Pryor, 3
c. The removal in solution of nutritive or harmful constituents (such as
mineral salts and organic matter) from an upper to a lower soil horizon by
the action of percolating water, either naturally (by rainwater) or
artificially (by irrigation). AGI
d. The extraction of soluble metals or salts from an ore by means of
slowly percolating solutions; e.g., the separation of gold by treatment
with a cyanide solution. Syn:lixiviation