a. A borehole put down by a core drill. Nelson
b. A cast hole cored with a dry-sand core instead of delivering as a hole
directly from the pattern. In general, the term is applied to any hole in
a casting that is not bored or drilled in the shop. Crispin
A solution used to form clear skin at surface of core. Pryor, 3
a. A rotary drilling rig that cuts and brings to the surface a core from
the drill hole. It is equipped with a core bit and a core barrel.
AGI
b. A lightweight, usually mobile drill that uses tubing instead of drill
pipe and that can core down from the grass roots. AGI
c. A mechanism designed to rotate and cause an annular-shaped rock-cutting
bit to penetrate rock formations, produce cylindrical cores of the
formations penetrated, and lift such cores to the surface, where they may
be collected and examined. See also:calyx drill; diamond drill;
rotary drill; shot drill. Long
d. The act or process of producing a cylindrical core of rock, using a
core-drilling machine and equipment. Long
e. A lightweight, usually mobile drilling machine equipped with a hollow
core bit and a core barrel that by rotation cuts out and recovers a rock
core sample. AGI
f. A drill that removes a cylindrical core from the drill hole.
Webster 3rd
a. The process of obtaining cylindrical rock samples by means of
annular-shaped rock-cutting bits rotated by a borehole-drilling machine.
Long
b. Drilling with a hollow bit and a core barrel to obtain a rock core.
The act or process of obtaining cylindrical samples of rock in the form of
a core. Long
A form in foundry work that serves to retain the shape of a core while it
is being baked. Crispin
a. A special tool that works like a screw or hydraulic jack, used to push
core out of a core barrel. Also called core plunger; core pusher.
Long
b. A fishing tool designed to recover core dropped from a core barrel and
resting on the bottom of a borehole. Also called basket; core basket; core
fisher; core grabber; core picker. Long
Material used in and/or the act or process of injecting small fragments of
rock or coarse sand into a core barrel to wedge the core inside the barrel
when no core lifter is used, as when using straightwall bits or drilling
with a shot drill. Long
A boring by a diamond drill or other machine that is made for the purpose
of obtaining core samples. AGI
The point in a borehole where an ore vein or body is encountered, as shown
by the core; also, the width or thickness of the orebody, as shown by the
core. Also called core interval. Long
See:core block
A structure in which boxed cores from numerous recorded localities are
stored and kept available for inspection and study. Long
A spring clip at the base of the core barrel that grips the core, enabling
it to be broken off and brought out of the hole. Also called core clip;
core gripper; core spring; ring lifter; split-ring lifter. Syn:catcher;
core breaker; core catcher; spring lifter; spring core lifter; lifter.
BS, 9
The explosive core of detonating cord, expressed as the number of grains
of explosive per foot or grams per meter. Atlas
The portion of rock cored but not recovered. CF:core recovery
Long
a. The dense central part of the Earth, below a depth of about 1,800 mi
(2,900 km). Syn:centrosphere
b. The Earth is believed to consist of the following: inner core, solid,
860 mi (1,384 km) radius; outer core, liquid, 1,300 mi (2,092 km) thick;
mantle, solid, 1,800 mi (2,897 km) thick; and crust, solid, 622 mi (1,001
km) thick. Hunt
a. The act or process of using information obtained from magnetic polarity
or other measurements of a piece of core in an attempt to determine the
downhole bearing of the structural features of the rock formation as
displayed in the core. Long
b. To place a piece of core in the same relative plane as it occupied
below the surface. See also:true dip
A cylinder containing chemically treated sand and used for stemming
shotholes in coal mines. Nelson
a. A framework built to support several tiers of core boxes. Long
b. Grooved or partitioned tray, supported on legs or sawhorses, on which
core is placed when removed from a core barrel for inspection or temporary
storage before being placed in boxes. Long
a. The proportion of the drilled rock column recovered as core in core
drilling. The amount withdrawn generally is expressed as a percentage of
the theoretical total in general terms, as excellent, good, fair, or poor.
CF:core loss
b. The amount of the drilled rock withdrawn as core in core drilling,
generally expressed as a percentage of the total length of the interval
cored. AGI