The plane formed by joining the crests of all beds in an anticline.
See also:crest
In an anticline, the line connecting the highest points on the same bed in
an infinite number of cross sections. See also:crest
Mixture of cresol isomers. Frother and froth stabilizing agent in
flotation process. Emulsion stabilizer. Pryor, 1
a. Applied to the third and final period of the Mesozoic Era. Extensive
marine chalk beds were deposited during this period.
b. Of the nature of chalk or relating to chalk. Fay
c. System of strata deposited in the Cretaceous Period. Fay
a. A wide breach or crack in the bank of a river or canal; esp. one in a
natural levee or an artificial bank of the lower Mississippi River.
Etymol: American French. AGI
b. A wide, deep break or fissure in the Earth after an earthquake.
AGI
c. A fissure in the surface of a glacier or icefall. AGI
a. A shallow fissure in the bedrock under a gold placer in which small but
highly concentrated deposits of gold may be found.
b. The fissure containing a vein. As employed in the Colorado mining
statute relative to a discovery shaft, a crevice is a mineral-bearing
vein. An older term.
Collecting gold that is in the crevices of a rock.
In bituminous coal mining, one of a crew of loaders who shovels coal,
blasting from working face, onto a conveyor that transports it from the
underground working place to a point where it is loaded into mine cars.
DOT
A construction of timbering made by piling logs or beams horizontally one
above another, and spiking or chaining them together, each layer being at
right angles to those above and below it. See also:curb
a. The construction of cribs, or timbers laid at right angles to each
other, sometimes filled with earth, as a roof support or as a support for
machinery. BCI
b. The close setting of timber supports when shaft sinking through loose
ground. The timber is usually square or rectangular and practically no
ground is exposed. The method is also used for constructing ore chutes.
See also:barring; close timbering; forepoling. Nelson
c. A method of timbering used primarily to rectify a mistake of removing
too great a percentage of the coal on the advance, and has the effect of
replacing part of the coal. Some are made by using timbers in pigpen
style; first laying timbers one way then placing other timbers across the
first. This is continued until the area between the bottom and the roof is
filled and wedged tight. Others are made by laying a layer of timbers
first in one direction, then another layer across at right angles to the
bottom layer. Space between the timbers in a layer varies according to
requirements. The hollow type are generally filled with gob.
Syn:penning
A sieve.
Segments of oak to encircle the shaft. Peel
a. A trigonal mineral, (Sr,La,Ce,Y)(Ti,Fe,Mn)21 O38 ;
formerly misidentified as a variety of ilmenite.
b. The mineral group crichtonite, davidite, landauite, loeveringite, and
senaite.
See:loose
a. Som. See:clay gall
b. Vertical joints affecting only the lower strata in a quarry.
Arkell
c. Joints in slate with an inclination opposite to the dip of the rock.
Arkell
a. The flattening made by a crimper near the mouth of a blasting cap for
holding the fuse in place.
b. To fix a detonator on blasting fuse by squeezing it with special
pliers. Pryor, 3
A tool specially made for fastening a cap to a fuse.
See also:cap crimper
a. Purple fluorite from Idaho. Schaller
b. A variety of purple fluorite from Utah.
A small fold, usually a fraction of an inch in wavelength. AGI
A diamond with a shallowish, wavy, or rough surface.
A marine limestone composed largely of fossil crinoid remains, such as
plates, disks, stems, or columns.