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New Brancepeth Colliery (Sleetburn Colliery), Deerness Valley, Durham Coalfield, Co. Durham, England, UK

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Probably the best known of the barium deposits of the coalfield, being described as early as 1900.
Two workable deposits were found, the eastern one being worked for barytes between 1904 and 1921 and then re-opened in 1940.
The western deposit came into production in 1938 and most of the subsequent barium mineral production came from this area. Reported production until closure in 1955 was 221,659 tons, of which only a few percent was of witherite.

Mineral List

12 entries listed. 12 valid minerals.

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L. J. Spencer (1910) On the Occurrence of Alstonite and Ullmannite (A Species New to Britain) in a Barytes-Witherite Vein at the New Brancepeth Colliery Near Durham. Mineralogical Magazine 15:302-311

J. A. Smythe (1947) Chemical Analysis of Ullmannite from New Brancepeth, Co. Durham. Mineralogical Magazine 28:173-174

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