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Bentonite layers from an ancient deposit of weathered volcanic ash tuff in Wyoming Gray shale and bentonites (Benton Shale; Colorado Springs, Colorado). Bentonite (/ ˈ b ɛ n t ə n aɪ t / BEN-tə-nyte) [1] [2] is an absorbent swelling clay consisting mostly of montmorillonite (a type of smectite) which can either be Na-montmorillonite or Ca-montmorillonite.
Bentonite usually forms from weathering of volcanic ash, most often in the presence of water. However, the term bentonite, as well as a similar clay called tonstein, have been used for clay beds of uncertain origin. For industrial purposes, two main classes of bentonite exist: sodium bentonite and calcium bentonite.
Bentonite: It is presently being extracted from Siwalik rocks found near Villages of Jalalpur Sharif and Dina in Jhelum District. Workable deposits also occur in Attock. Sandy terrain of the Pabby Hills near village Tainpur. Dina, Jhelum District have been reported to be the best places where economic deposits of bentonite are found. [2 ...
In places bentonite has been mined from altered volcanic ash beds in Cenozoic intermontane sedimentary basins. Central Montana has metal ore deposits that have been mined in the Little Rocky Mountains, the North Moccasin Mountains, the Judith Mountains and the Little Belt Mountains.
Several different types of bentonite can be found; however, potassium bentonite is the main one associated with the Deicke and Millbrig eruptions. The Deicke and Millbrig K-bentonite layers can be found from Alabama to New York to Minnesota. These K-bentonite layers are up to a meter thick in some locations. [8] Such thickness is unique.
In 1939 mines near Quincy produced half the U.S. production. [8] In the United Kingdom, fuller's earth occurs mainly in England. It has been mined in the Lower Greensand Group and the Vale of White Horse, Oxfordshire. The Combe Hay Mine was a fuller's earth mine operating to the south of Bath, Somerset, until 1979. [9]
SSR Mining Unity Salt Unity: Sifto Canada/Compass Minerals: Vanscoy Potash Salt Vanscoy: Nutrien: Previously Agrium. Merged with PotashCorp to form Nutrien on January 1, 2018 Wilcox Bentonite Bentonite: Wilcox: Canadian Clay Products, Inc.
The Gewane-Mille mine is a mine located in southern Ethiopia. It represents the largest bentonite reserve in the country, and has been estimated at 70 million tonnes. [ 1 ]