The formation of folds in rocks. AGI
A mountain resulting chiefly from large-scale folding of the Earth's
crust.
A group of folds showing common characteristics and trends and presumably
of common origin.
Thin, leaflike layers or laminae; specif., those of gneissic or schistose
rocks. Singular form is folium. AGI
A general term for any foliated rock. Adj. of foliation.
Adj. of foliation.
A general term for a planar arrangement of textural or structural features
in any type of rock; esp., the planar structure that results from
flattening of the constituent grains of a metamorphic rock. Adj. foliate;
foliated. CF:schistosity
A table showing (1) the size of casing or pipe that should be placed in a
borehole drilled with a specific-size bit and (2) which sizes of casing or
pipe can be nested inside each other. Long
The follower rail of a mine switch is the rail on the other side of the
turnout corresponding to the lead rail. Kiser
A thin bed of unconsolidated dirt; a parting between the top of coal seam
and the roof. See also:pug
The cardboard tag placed in the cartons, boxes, or cases of blasting
supplies; used for identifying the date and place of manufacture.
Fay
A method for the sintering of the raw materials for the burden of blast
furnaces in which continuous sintering is carried out in a rotating tube
furnace; at the discharge end a special tuyere is arranged comprising two
concentric close-ended tubes parallel to the furnace axis, the outer tube
having one nozzle near its closed extremity, the other having a number of
nozzles protruding through the outer tube. The inner tube supplies air
heated to 650 to 800 degrees C; the outer one carries cold air, which
keeps the inner tube from softening and becoming deformed and itself
becomes somewhat heated by the time it emerges from the nozzle. These jets
are directed upon the material to be sintered. The fine iron-bearing
material is mixed with a proportion of fuel; under the intensive action of
the hot air blast, the fuel raises the temperature of the mixture
sufficiently for sintering to occur, whereupon the material is discharged
from the furnace. Osborne
See:pyrite
a. The bottom of a slope, grade, or declivity. The lower part of any
elevated landform; e.g., the foot of a hill, the foot of a mountain, etc.
AGI
b. The lower bend of a fold or structural terrace. CF:head
Syn:lower break
c. See:footwall
d. The foot is 12 in (30.5 cm) in length on the vein, including its entire
width, whether 6 in (15.2 cm) or 60 ft (18.3 m), and its whole depth down
toward the Earth's center. Standard, 2
e. Corn. An ancient measure containing 2 gal or 60 lb of black tin.
f. That portion of the displaced material of a landslide that lies
downslope from the toe of the surface of rupture (Varnes, 1978).
AGI
See:acre-foot
See:marker block
The average number of feet of borehole specific types of drill bits can be
expected to drill in a certain rock before the bit becomes dulled and is
replaced, discarded, resharpened, or reset. Long
See:safety clamp
See:connellite
Any of the holes cut in the sides of shafts or winzes to enable miners to
ascend and descend. Zern
a. A relatively shallow foundation by which concentrated loads of a
structure are distributed directly to the supporting soil or rock through
an enlargement of the base of a column or wall. Its ratio of base width to
depth of foundation commonly exceeds unity. CF:pier
b. The characteristics of the material directly beneath the base of a
drill tripod, a derrick, or mast uprights. Also, the material placed under
such members to produce a firm base on which they may be set. Long