A composite rock whose banding is wholly or partly caused by lit-par-lit
injection of granitic magma into layered rock.
See also:composite gneiss
Metamorphism accompanied by intimate injection of sheets and streaks of
liquid magma (usually granitic) in zones near deep-seated intrusive
contacts. CF:plutonic metamorphism; lit-par-lit. AGI
The total amount of pressure required to force a liquid or grout into
cracks, cavities, and pores in rocks or other substance. Long
a. Any apparatus used to force, under pressure, material into an opening
in another material. Long
b. A device used to force-feed water into a boiler by the direct action of
steam. See also:inspirator
c. Mechanism used for spraying fuel oil into the combustion-type engine or
to spray a fine oil mist into a stream of air or steam.
See also:air mover
a. Native copperas (melanterite), or a stone containing it. Used in
inkmaking. Webster 2nd
b. A stone slab used in preparing India ink for use. Webster 2nd
An area or group of rocks surrounded by rocks of younger age; e.g., an
eroded anticlinal crest. CF:outlier
A valve that proves the cage is in the correct position relative to the
decking level. Sinclair, 5
Being at a point, place, or position farthest from the exterior; deepest
within; innermost; such as, the inmost depths of a mine.
Standard, 2
The central part of the Earth's core, extending from a depth of about
5,100 km to the center (6,371 km) of the Earth; its radius is about
one-third of the whole core. The inner core is probably solid, as
evidenced by the observation of S waves that are propagated in it, and
because compressional waves travel noticeably faster through it than
through the outer core. Density ranges from 10.5 to 15.5 g/cm3 .
It is equivalent to the G layer. CF:outer core
AGI
The lower part of the mantle. Schieferdecker
The isoseismal line surrounding the area experiencing the greatest damage
to manmade structures during an earthquake.
The addition of a material to molten metal to form nuclei for
crystallization. ASM, 1
Pertaining or relating to a compound that contains no carbon.
CF:organic
See:inby
A crushing system that can be a fully mobile unit or a permanently fixed
unit at the point of mining so that the mined material can be transported
out of the pit by a conveyor system. SME, 1
In bullion assay, dissolution of silver from associated gold by use of
nitric acid. Pryor, 3
A sudden and often overwhelming flow of water into mine workings. Inrushes
of water may be caused by striking unsuspected waterlogged old workings
that possibly were shown inaccurately on the mine plans. Faults have also
been responsible for serious inflows of water. A fault may retain large
volumes of water above or at the same level as workings approaching it. It
is usual to drive exploring headings in the direction of the suspected
water danger. See also:mud rush; old working; inundation; stopping;
tapping; tapping old workings; water inrush; waterlogged. Nelson
A prominent isolated residual knob, hill, or small mountain rising
abruptly from an extensive erosion surface in a hot, dry region (as in the
deserts of southern Africa or Arabia), generally bare and rocky, although
partly buried by the debris derived from its slopes. Etymol: German
Inselberg, island mountain. CF:monadnock
Formed pieces of sintered cobalt-tungsten carbide mixture (in which
diamonds may be inset), brazed into slots or holes in drilling bits or
into grooves on the outside surface of a reaming shell to act as cutting
points, reaming surfaces, or wear-resistant pads or surfaces of reaming
shells or outside surfaces of other pieces of drilling equipment or
fittings. Also called inserts. See also:insert bit; insert set.
CF:slug
A bit into which inset cutting points of various preshaped pieces of hard
metal (usually a sintered, tungsten carbide-cobalt powder alloy) are
brazed or hand-peened into slots or holes cut or drilled into a blank bit.
Hard-metal inserts may or may not contain diamonds. Also called slug bit.
See also:insert