(Jakobsbergsgruvan, Nordmark, Filipstad, Värmland, Sverige)
The Jakobsberg mine belongs to the Nordmark ore field. This "Långban type" deposit was mined for Mn and Fe 1891–1918. The hematite and hausmannite ores are associated with skarns and veins enriched in Ba, Pb, As, Sb, B, and Be.
Ref.: Sjögren (1895) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 17: 313.
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: 900, 1021, 1037.
Mineralogical Record: 32: 311.
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Map Reference: 59°49'N , 14°6'E
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