What does gangue mean?
Gangue is the unwanted material that accompanies valuable ore in a mine or processing plant. It commonly consists of waste rock, barren minerals, and other material that is separated from the ore because it has little or no economic value. The term is used chiefly in mining, mineral processing, metallurgy, and environmental planning. In a producing mine, identifying and separating gangue efficiently is important because it affects the quality of the recovered ore and the handling of waste. Gangue may also be discussed in connection with mine safety, tailings and waste-rock storage, and the environmental effects of mineral extraction. Although it can sound unusual, gangue is a precise technical term: it refers to low-value mineral material associated with ore, rather than to every kind of mine debris or factory waste. Its unusual history also makes it memorable, since it was borrowed into English through American Spanish from a Quechua term connected with rock.
nounGangue is the waste rock and other mineral material associated with valuable ore, which is separated from the ore during mining and processing. It may contain little or no commercially valuable mineral.
- Waste rock or other mineral material of little value that occurs with valuable ore and is separated during mining or processing.
"The mill uses gravity separation to remove the lighter gangue from the crushed ore."
"The ore was carried to the plant, where workers removed the surrounding gangue by hand."
"Environmental plans must account for the safe storage and disposal of the mine's waste gangue."
The plural is uncommon, but it can distinguish separate quantities or types of waste material.
"The survey identified several distinct gangues around the ore body."
From a Quechua word for rock to the unwanted material that accompanies a mine’s treasure, gangue has a distinctly geological backstory.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of gangue
The word entered English in the early nineteenth century through American Spanish, in which gangue denotes waste rock associated with ore. The Spanish word is generally traced to the Quechua huanhu, associated with rock or broken stone. English mining usage subsequently established it as the standard term for worthless material accompanying valuable ore.
How gangue is actually used
Gangue is primarily a technical mining and mineral-processing term. It is usually treated as a mass noun, although the plural gangues is used when referring to separate quantities or types of waste material.
Easily confused with gangue
Gangue is waste material associated with ore, whereas a gangway is a temporary walkway or passage used in a mine.