To load coal or rock that is to be taken out of the mine. Fay
See:lodestone
Alternate spelling of lodestone. See also:lodestone
The weight of the strata above every excavation is largely transferred to
the coal pillars or packs in the vicinity. Attempts are made to control
and facilitate this load transfer in the yield-pillar system and in double
packing. See also:abutment; pressure arch. Nelson
A rammer used in making a loam mold. Standard, 2
A disk of dried loam used to cover a loam mold; it has holes through which
melted metal is poured and air escapes. Standard, 2
A method of geochemical prospecting in which samples of soil or other
surficial material are tested for traces of the metal desired, its
presence presumably indicating a near-surface orebody. AGI
An earlier type of rapid plow traveling at 70 ft/min (21.3 m/min) across
the face. Nelson
A lagging consisting of galvanized steel wire frames fastened to
underground haulageway supports by special wire fasteners to provide a
continuous lining. Nelson
Steps in a mine. Hess
A galvanic cell resulting from inhomogeneities between areas on a metal
surface in an electrolyte. The inhomogeneities may be of physical or
chemical nature in either the metal or its environment. See also:cell
ASM, 1
A natural earth current of local origin, such as one arising from the
oxidation of a sulfide deposit. A term used in electrical prospecting.
AGI
The extension produced in a tensile test after the ultimate tensile stress
has been passed and concentrated on part of the gauge length where a neck
is formed. CTD
Plants of wide geographic distribution having an affinity for absorbing
certain metallic elements from the soil and which can be used in
geochemical exploration to indicate presence of local concentrations of
metals. CF:universal plant indicator
Metamorphism caused by a local process; e.g., contact metamorphism or
metasomatism near an igneous body, hydrothermal metamorphism, or
dislocation metamorphism in a fault zone. CF:regional metamorphism
AGI
Failure in which the ultimate shearing strength of the soil is mobilized
only locally along the potential surface of sliding at the time the
structure supported by the soil is impaired by excessive movement.
ASCE
An unconformity that is strictly limited in geographic extent and that
usually represents a relatively short period, such as one developed around
the margins of a sedimentary basin or along the axis of a structural trend
that rose intermittently while continuous deposition occurred in an
adjacent area. It may be similar in appearance to, but lacks the regional
importance of, a disconformity. CF:regional unconformity
A pipe or shaft to convey foul air from a plumbing fixture or a room to
the outer air. Crispin
Ventilation of the drives and headings in mines by use of the pressure
gradient of the main air current. Stoces
A legal term that, for public lands in the United States, defines a
mineral or mineral commodity that is acquired through the General Mining
Law of 1872, as amended (30 U.S.C. 22-54, 161, 162, 611-615). These are
the base and precious metal ores, ferrous metal ores, and certain classes
of industrial minerals. Acquisition is by staking a mining claim
(location) over the deposit and then acquiring the necessary permits to
explore or mine. SME, 1
Delimited by having the boundaries ascertained and monumented on the
ground, identified by having a notice of location posted upon the land,
and further proclaimed to the public by having such notice of location
recorded in the manner customary under the rules for recording mining
claims. Ricketts