Metamorphosed norite containing cordierite. Holmes, 2
a. A comprehensive term for an extensive series or broad assemblage of
more or less parallel ranges, systems, and chains of mountains, the
component parts having various trends but the mass itself having one
general direction; esp. the great mountain region of western North America
from the eastern face of the Rocky Mountains to the Pacific Ocean, or the
parallel chains of the Andes in South America; a mountain province.
AGI
b. An individual mountain chain with closely connected, distinct summits
resembling the strands of a rope or the links of a chain; e.g., one of the
parallel chains of the Rocky Mountains. AGI
c. A term also used in South America for an individual mountain range.
Etymol: Spanish, chain or range of mountains, from Latin chorda, cord.
AGI
The refining of lead by conducting steam through it, while molten, to
oxidize certain metallic impurities. Fay
An explosive compound consisting of cellulose nitrate and a restrainer,
such as vaseline, used chiefly as a propellant. Standard, 2
About 7 tons, but measured by wagonloads, and not by weight. The
expression "cord" is a term used in some parts of Colorado and applied
only to low-grade ore; the smelting ore is reckoned by the ton.
A detonating fuse suitable for opencast and quarry mining. It consists of
an explosive core of pentaerythritol tetranitrate (PETN) contained within
plastic covering. It has an average velocity of detonation of 21,350 ft/s
(6,500 m/s). This is practically instantaneous. Cordtex detonating fuse is
initiated by electric or a No. 6 plain detonator attached to its side with
an adhesive tape. Nelson
A new device to achieve short-interval delay firing with Cordtex. A relay
is an aluminum tube with a delay device, and is inserted in a line of
Cordtex where required. The relays are made with two delays, 15 ms and 20
ms, respectively. Nelson
A ribbed and napped textile material used for recovering coarse gold or
other heavy metal or mineral from a stream of sand passing over it. A
corduroy blanket is replaced about every 4 hours for washing to remove the
gold. Nelson
See:graphic granite
Bands of coarse-grained quartz and albite or microcline in rock.
Hess
A hexagonal mineral, Ba(Ce,La)2 (CO3 )3 F2 ;
rare; in pegmatites in nepheline syenites.
4 Õ ôÙ OÒ ’DICTIONARY TERMS:core a. A cylindrical section of rock, usually 5 to
[\B]core[\N]
a. The characteristics of the minerals contained in a specific section of
a core sample as determined petrographically, by metallurgical treatments
and/or by chemical or cupelling methods. Also called core assay; core
values. Long
b. As used by the petroleum industry, a study of a core sample to
determine its water and oil content, porosity, permeability, etc.
Long
Detonating fuse used in blasting. Syn:Cordtex
a. A hollow cylinder attached to a specially designed bit and which is
used to obtain and to preserve a continuous section, or core, of the rocks
penetrated in drilling. AGI
b. A tube inside a drill pipe and which is supported by a bit to receive
the core, in core boring. Webster 3rd
a. A hollow, cylindrical boring bit for cutting a core in rock drilling or
in boring unconsolidated earth material. It is the cutting end of a core
drill.
b. A hollow, cylindrical drill bit for cutting a core of rock in a drill
hole; the cutting end of a core drill. Syn:coring bit
An obstruction inside a bit, reaming shell, or core barrel consisting of
impacted core fragments or drill cuttings, which prevents entry of core
into the core barrel. See also:block
As used by soil- and foundation-testing engineers, a syn. for core;
cuttings; drill sludge. Long
a. The wooden, metal, or cardboard box divided into narrow parallel
sections, used to store the cores at the surface as they are extracted
from a core barrel or corer. AGI
b. The box in which the core, or mass of sand producing any hollow part of
a casting, is made. Fay
a. See:core lifter
b. A sharp-cornered pluglike device inside an annular-shaped bit, which
breaks up any core produced into pieces small enough to be washed out of
the borehole as cuttings. Long
a. Sievelike tray or device on or in which the core is ejected
continuously from the upper end of a drill string, and is caught and held
when core is recovered by counterflow or reverse-flow continuous
core-drilling techniques. Long
b. See:core lifter
c. A steel spring fitted at the lower end of a soil sampler to keep the
sample from dropping out. Nelson
d. In deep boring, a ring of steel of wedge form cut into vertical stripes
that encircles and rides on the core when drilling, but wedges the core in
the core barrel when drilling ceases and the rods are lifted.
Nelson
cored ammonium nitrate dynamite
The dynamites of this class come in cartridges 4 in (10.2 cm) and up in
diameter and in weight strengths from 20% to 70%. Their water resistance
is considered good (the gelatin core being responsible for this), but
their fume characteristics are rated as poor. Besides providing increased
water resistance, these explosives tend to exhibit the higher velocities
characteristic of gelatin explosives (10,500 ft/s, 15,000 ft/s, and 17,000
ft/s) (3,200 m/s, 4,600 m/s, and 5,200 m/s), rather than the low and
medium velocities characteristic of other straight ammonia dynamite. In
addition, the gelatin core assures propagation of detonation through the
entire explosives column. Gelatin cored ammonia dynamites also are very
useful when an operator wishes to practice alternate velocity loading to
attain a more effective one-two punch in conjunction with the use of short
period or millisecond delay, electric blasting caps.
Pit and Quarry