The relative rate of flow per unit area of a particular constituent of a
mixture divided by the gradient of composition, temperature, or other
property considered to be causing the diffusion.
a. To mine coal; applied to bituminous workings. See also:gouge
b. To excavate; make a passage into or through, or remove by taking away
material.
c. Crushed strata. Nelson
A pit that is below the surrounding area on all sides. Also called sunken
pit. Nichols, 1
An isometric mineral, Cu9 S5 ; blue to black; in veins with
chalcocite; a source of copper. Syn:blue chalcocite; alpha chalcocite.
CF:copper sulfide
a. One that digs in the ground, as a miner or a tool for digging.
Webster 3rd
b. A worker who is paid by the ton for coal produced; a miner in the
stricter sense. Originally the digger mined or undermined the coal; now
the term is applied to the worker who merely shoots out the coal.
Fay
c. A machine for removing coal from the bed of streams, the coal having
washed down from collieries of culm banks above. Zern
The formed serrated edges of the buckets used for digging purposes on a
bucket loader.
The formed tools interspaced with the buckets of a bucket loader to aid in
digging action.
Mining operations in coal or other minerals.
According to English drillers, a noncoring bit usually similar to a steel
drag or mud bit. Long
Complete set of operations a machine performs before repeating them.
Nichols, 2
See:bank height
On a shovel, the cable that forces the bucket into the soil. Called crowd
in a dipper shovel, drag in a pull shovel, and dragline and closing line
in a clamshell. Nichols, 1
The resistance that must be overcome to dig a formation. This resistance
is made up largely of hardness, coarseness, friction, adhesion, cohesion,
and weight. Nichols, 3
Applicable to all mineral deposits and mining camps, but as used in the
United States it is usually applied to placer mining only.
See also:bar diggings
A map using data in a software format so that the maps have the
characteristic of layered features on an overlay generated by
computer-aided drafting and design to plot these features. SME, 1
Having two sides, as a figure; having two faces, as a crystal. Fay
See:pseudomalachite
a. An earthen embankment, as around a drill sump or tank, or to impound a
body of water or mill tailing.
b. A tabular igneous intrusion that cuts across the bedding or foliation
of the country rock. Also spelled: dyke. CF:sill; sheet.
See also:dikelet
A small dike. There is no agreement on specific size distinctions.
AGI
A wall-like ridge created when erosion removes softer material from along
the sides of a dike.
The intrusive rock comprising a dike. AGI