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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.





 UK OS Grid Reference: NZ223420
Map Reference: 54°46'20"N , 1°39'11"W

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Mineral List:
  		•  Alstonite
    BaCa(CO
     
    3
    		)
     
    2
    Reference: [Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 219.]
  		•  Arsenopyrite
    FeAsS - (Fe
     
    0.90
    		Co
     
    0.10
    		)AsS
    Reference: [Dunham, Sir K. C. Geology of the North Pennine Orefield, Volume 1 Tyne to Stainmore (2nd Edition), pp 276-278]
  		•  Baryte
    BaSO
     
    4
    Reference: [Dunham, Sir K. C. Geology of the North Pennine Orefield, Volume 1 Tyne to Stainmore (2nd Edition), pp 276-278]
  		•  Sphalerite
    (Zn,Fe
    2+
     
    		)S
    Reference: [Dunham, Sir K. C. Geology of the North Pennine Orefield, Volume 1 Tyne to Stainmore (2nd Edition), pp 276-278]
  		•  Ullmannite
    NiSbS
    Reference: [Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990]
  		•  Witherite
    BaCO
     
    3
    Reference: [No reference listed]


    6 entries listed. 6 valid minerals.

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