Gangue
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Gangue, or veinstone, is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit. It is thus distinct from overburden, which is the waste rock
Crystals of cassiterite, a commercially valuable ore mineral, in a matrix of quartz, the gangue
Banded Zn-Pb ore sample with sphalerite (brown) and galena (silver-grey) as main ore minerals and calcite (white) as main gangue mineral
Native gold partially contained within a quartz gangue, visible at lower left.
Mineral processing
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Mineral processing is the process of separating commercially valuable minerals from their ores in the field of extractive metallurgy. Depending on the processes used in each instance, it is often refe
Gangue
…an ore or mineral body that is displaced during mining without being processed. The separation of valuable mineral from gangue minerals is known as mineral processing, mineral dressing, or ore dressing. It is a necessary, and often significant, aspect of mining. It can be a complicated process, depending on the nature…
A set of Cornish stamps
Froth flotation cells used to concentrate copper and nickel sulfide minerals
Screening ore through a sieve, Fixed Nitrogen Research Laboratory, 1930