A fault along which all straight lines on opposite sides of the fault and
outside the dislocated zone that were parallel before the displacement are
parallel afterward. AGI
A cylindrical form of drum on which the haulage or winding rope is coiled.
The drum roll may be plain or grooved. For deep winds, multilayering of
rope is often used to reduce the drum size required. Also, for deep
winding (3,000 ft or 915 m or more), a balance rope is almost essential
with a parallel drum. Syn:cylindrical drum
Nelson
See:portable parallel duplex mine cable
Usually an intake airway parallel to the haulageway. USBM, 1
In mineral optics, refers to crystal edges or cleavage traces parallel to
the optic directions of the mineral. CF:extinction
The firing of detonators in a round of shots by dividing the total supply
current between the individual detonators. CF:series firing
BS, 12
Flow in the same direction of two or more streams within a stream system.
A fold in which beds maintain the same thicknesses throughout.
CF:similar fold; supratenuous fold. Syn:concentric fold
Two or more crystals with corresponding faces parallel. Fay
Lines that lie in the same plane and are equally distant from each other
at all points. The term is ordinarily applied to straight lines.
Jones, 2
Quadrilateral that has opposite sides parallel and opposite angles equal.
Jones, 2
A ripple mark with a relatively straight crest and an asymmetric profile;
specif. a current ripple mark. AGI
Two or more series of electric blasting caps arranged in parallel.
See also:multiple series
A method of connecting together a number of detonators to be fired
electrically in one blast. The circuit consists of a number of series
circuits connected in parallel. Syn:series-in-parallel circuit
Nelson
See:disconformity
An electrical prospecting method using equipotential lines or curves in
prospecting for orebodies. In the parallel wire method, two bare copper
wires about 3,000 ft (915 m) long, placed about 2,000 ft (610 m) or more
apart, are used as electrodes. Current is supplied from the generator, and
the electrodes are connected to the ground at 100 ft (30 m) intervals by
iron grounding pins. Equipotential lines are located by two electrodes or
wooden rods, to one end of which are fastened metal spikes about 6 to 7 in
(15 to 18 cm) long. The electrodes are connected by some 150 ft (46 m) of
wire that runs down the rods to the spikes. If a head telephone is placed
in the circuit, the absence of sound in the telephone indicates that the
two electrodes are at the same potential. By this method, the
equipotential lines can be traced. Lewis
Having a small positive magnetic susceptibility. A paramagnetic mineral
such as olivine, pyroxene, or biotite contains magnetic ions that tend to
align along an applied magnetic field but do not have a spontaneous
magnetic order. CF:diamagnetic
a. The magnetism of a paramagnetic substance. The property by which the
north pole of a magnet that is magnetized by induction is repelled to 180
degrees by the north pole of the inducing magnet. Standard, 2
b. The property possessed by a substance of producing a higher
concentration of magnetic lines of force within itself than in the
surrounding magnetic field when it is placed in such a field.
Miall
c. A property of many substances, related to ferromagnetism, by virtue of
which, when placed in a nonuniform magnetic field, they tend to move
toward the strongest part. Permanent magnetism is practically absent and
the susceptibility, which is much less than that of iron, is constant at
any given temperature, but in most substances it is nearly inversely
proportional to the absolute temperature. CF:ferrimagnetism;
diamagnetism. Holmes, 1
A tetragonal mineral, Cu+2 Cu2+2
O3 ; purplish black; at Bisbee, AZ.
a. A constant or variable in a mathematical expression that distinguishes
various specific situations.
b. In crystallography, one of the three non-coplanar vectors which
describe a lattice. Syn:lattice parameter
An orthorhombic mineral, VO2 ; forms by loss of hydrogen and iron
from montroseite in an initial stage of oxidation of uranium-vanadium
deposits.