The component of the slip measured parallel with the dip of the strata.
Fay
A valley trending in the direction of the general dip of the rock layers
of a region.
a. The workings on the lower side of the level or gate road in an inclined
seam. Dip workings may present water problems and require pumping. Also
called deep workings. Nelson
b. Underhand excavations in which miner works downward and lifts spoil to
removal point. Not self-draining. Pryor, 3
A closed form consisting of orthorhombic, trigonal, tetragonal, or
hexagonal positive and negative pyramids. Syn:bipyramid
CF:bipyramid; pyramid.
A variety of scapolite having marialite:meionite between 3:1 and 3:2.
Syn:mizzonite; dipyrite.
See:dipyre; pyrrhotite.
One in which an increasing measured value in the input signal produces an
increasing controller output, and vice versa. Pryor, 3
One in which an arc is struck between an electrode and the material
charged into the furnace. Pryor, 3
A method of effecting extinction of mine fires using water or the effluent
of chemical fire extinguishers. When a mine fire is readily accessible to
the firefighting personnel, extinction of it may be achieved by direct
application of some substance that will cool down the hot mass below its
ignition temperature, or, in the case of oils, will arrest the
volatilization process by sealing or emulsifying the oil surface.
Mason
a. The combustion of coal effected by burning directly on a grate.
Fay
b. A method of firing wherein the products of combustion come in contact
with the ware. ACSB, 2
Flushing in which the water rises along the rod on its outer side; i.e.,
between the walls of the borehole and the rod, and with such a velocity
that the broken rock fragments are carried up by this water current.
Stoces
The system in which an engine with a single drum and rope draws loaded
trucks up an incline. The empties run downhill dragging the rope after
them. CTD
The placing of the detonator in the last cartridge to be inserted in the
shothole with the active end of the detonator pointing inward. This
position tends to minimize the risk of gas ignition.
See also:inverse initiation
a. Angle to the right (clockwise) from an arbitrary zero direction. Used
chiefly in triangulation. Seelye, 2
b. See:trend
a. The art of drilling a borehole wherein the course of the hole is
planned before drilling. Such holes are usually drilled with rotary
equipment and are useful in drilling divergent tests from one location,
tests that otherwise might be inaccessible, as controls for fire and wild
wells, etc. AGI
b. Drilling in which the course of a borehole is controlled by deflection
wedges or other means. The technique of directional drilling is used (1)
to deflect a deviated borehole back onto course and (2) to deflect a
borehole off course, either to bypass an obstruction in the hole or to
take a second core. Syn:slant drilling
The solidification of molten metal in a casting in such a manner that feed
metal is always available for the portion just solidifying. ASM, 1
Electromagnetic exploration methods in which one determines the direction
of the magnetic field associated with the currents. Schieferdecker
Any one of a number of geophysical devices used to determine the deviation
of a borehole from vertical. AGI
See:line of dip