|
A | B |
C | D | E
| F | G | H
| I | J | K
| L | M | N
| O | P | Q
| R | S | T
| U | V | W
| X | Y | Z
G
gaining (effluent) stream - (3) a stream or reach of a stream
that receives water from the zone of saturation and provides base
flow; its channel lies below the water table. See also losing
stream.
gangue - (1) the worthless minerals that are associated
with the valuable minerals in an ore. As much of this gangue as
possible is removed by the processes of concentrating and
smelting.
gossan - (4) the rust-colored oxidized capping or staining
of a mineral deposit, generally formed by the oxidation or
alteration of iron sulfides.
grade - (4) amount or weight of metal or mineral present
in the host rock. Commonly expressed as %, ppm, ppb, g/t, or oz/t.
grain - (4) crystals or multi-crystal fragments within a
lithified matrix. For example, sand grains in sandstone and quartz
grains in sand-sized particles.
grain size - (4) the size range of fragments or crystals
in consolidated materials. A description of the textural coarseness
of a rock.
grind - (4) reduce particle size into fine powder through
impact or attrition (wear down by friction). On a large scale, typically
achieved in a rotating cylinder. Includes rod and ball
mills.
grizzly - (2) a device used for coarse screening of bulk
materials. A rugged screen for rough sizing at a comparatively large
size (for example, 6 inches); it can comprise fixed or moving bars,
disks or shaped tumblers or rollers.
grouting - (4) the injection of a cement slurry or other
suitable materials (grout) under pressure into fissured, jointed
or permeable rock in order to reduce the permeability or
increase the strength. A process used to reduce water flow around
bulkheads. The injection of grout into bedrock is usually done through
diamond drill holes. Bentonite grout curtains have been used
to reduce the permeability of waste rock.
growth media - (3) See also replacement growth
media.
Educational Materials
| Glossary | Links
| Products & Services
|
