Latitude: 59°50'N
Longitude: 15°32'E
Sjögruvan, Grythyttan, Hällefors, Västmanland, Sverige
Note on the name: the name Sjögruvan being a proper name and thus should not be translated into the English Sjö mine.
The Sjögruvan Mine worked on a minor deposit. The paragenesis is of the Långban type. The mine is located on the southern shore of the lake Halvtron about 5 km southeast of the small village Grythyttan.
Operations began as early as 1643, and it was mentioned in official records in 1673 and 1698. It was stated in 1697 that the mine was 4.5 meters deep, "but the mineralisation is flooded by the lake so it is not possible to use." The mine was mentioned once more during the 18th century, but was abandoned completely until it was reopened by L. J. Igelström in the 1860s, who operated it mainly due to the rare minerals he discovered there.
During the years 1886-1889, the mine produced 303,000 kg of manganese ore and 85,000 kg of iron ore. The mine was 16 meters deep when it was abandoned. The ores where found in a dolomitic carbonate rock, the iron ore was mainly hematite, and the manganese ore was composed of hausmannite, braunite and rhodonite.
Formerly in Örebro County.
References
- Igelström, L.J. (1886): Polyarsenit och hæmatostibiit. Geologiska Föreningen i Stockholm Förhandlingar 8: 179-181 [on sarkinite and katoprite from Sjögruvan]
- Igelström, L.J. (1886): Mineralogiska meddelanden. 4. Braunit från Sjögrufvan, Grythytte socken, Örebro län. Geologiska Föreningens i Stockholm Förhandlingar 8: 477
- Sundius, N (1923) Grythyttefältets geologi. SGU ser C 312.
- Tegengren, F.R. (1924) Sveriges ädlare malmer och bergverk. SGU ser Ca 17.
- Geijer, P. and Magnusson, N.H. (1944) De mellansvenska järnmalmernas geologi. SGU ser Ca 35.
- Palache, C., Berman, H. & Frondel, C. (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, 7th. edition, Volume I: 640.
- 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. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 844, 845, 857, 1025, 1030, 1041.
- Moore, P.B. (1970) Mineralogy and Chemistry of Långban-type Deposits in Bergslagen, Sweden. Mineralogical Record: 1: 4.
- Moore, P. B. (1972) Contributions to the mineralogy of Sweden. III. On Igelström's manganese arsenates and antimonates from the Sjö Mine, Grythyttan, Örebro County, Sweden. GFF 94 (3), 423-434.
- Wilke, H-J (1976) Mineralfundstellen in Skandinavien. München.
- Holtstam, D. (2001): W and V mineralization in Långban- type Fe-Mn deposits: Epigenetic or Syngenetic? Geologiske Föreningen i Stockholm Förhandlingar 123, 29-33.
- Fontan, F.; Holtstam, D.; de Parseval, P.; Permingeat, F. and Mason, B. (2004): Elfstorpite synonymy with allactite; mineral and name discredited. Mineralogical Magazine 68, 523-526.
- Mineralium Deposita: 36(7): 641-657.
External Links
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http://www.geonord.org/langban/sjo_eng.htmMineral List
61 entries listed. 47 valid minerals. 3 type localities (valid minerals).
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