Copper and cobalt mines 14 km SSW of Nyköping. Producing only copper from around the year 1420 when the Swedish King "Erik av Pommern" gave the miners the mining privileges. The Mine "Storgruvan" was abandoned during the 16th century because a pegmatite lens cut the ore and miners lost trace of it.
Reopened successfully first in the 1750ies, the cobalt content was discovered around 1790 and produced as a valuable secondary product.
Mines finally closed~ 1890. Copper and cobalt occur disseminated as sulphides in skarn ores.
By far the richest and largest Mine was Storgruvan (de Besche'ska, Stor Mine)- two wellknown parts were called; Görans Shaft and Lovisins Shaft. Lesser production from Adolfsbergsgruvan, Kabbelgruvan and Österbergsgruvan. Among the other mines were Sofia Magdalena gruvan, Näsmansgruvan and Kattgruvan.
NOTE:
1. According to the type description of both Kieftite and Oenite, the typematerial were collected "from the dumps at the abandoned mine in Cu-Co sulfide skarns of the central zone". (Dobbe et al. 1994 and Dobbe and Zakrewski 1998). They did not reveal the name of the "abandoned mine".
References
- Klaproth, M.H. (1797): Untersuchung des Glanzkobalts von Tunaberg , Beiträge zur chemischen Kenntniss der Mineralkörper, Zweiter Band, Rottmann Berlin, 302-307
- Johansson, H.E. (1909): Om Tunabergs kopparmalmsfält. Sveriges Geologiska Undersökning, serie C221 (in Swedish)
- Dobbe, Rene T. M. (1991): Tellurides, selenides, and associated minerals in the Tunaberg copper deposits, SE Bergslagen, central Sweden. Mineralogy and Petrology 44, 89-106.
- Econ. Geol. (1994) 89: 919-930.
- Dobbe, R. T. M.; Oen, I. S. (1994): The polymetallic Cu-Co ores in the central mineralized zone at Tunaberg, Bergslagen, Sweden. Neues Jahrbuch fuer Mineralogie, Abhandlungen 166, 261-294.
- Dobbe, R. T. M., Lustenhouwer, W. and Zakrzewski, M. A. (1994): Kieftite, CoSb3, a new member of the Skutterudite group from Tunaberg, Sweden. Canadian Mineralogist. 32, 179-183 [http://rruff.geo.arizona.edu/doclib/cm/vol32/CM32_179.pdf]
- Dobbe, R. T. M. and Zakrzewski, M. A. (1998): Oenite, CoSbAs, a new mineral species from the Tunaberg Cu–Co–sulfide skarns, Bergslagen, Sweden, The Canadian Mineralogist. 36, 855-860 http://rruff.geo.arizona.edu/doclib/cm/vol36/CM36_855.pdf]
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