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Östanmossa mine, Röberg ore field, Norberg, Västmanland, Sweden

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Latitude & Longitude (WGS84): 60° 5' North , 15° 56' East
Latitude & Longitude (decimal): 60.0833333333, 15.9333333333
Name(s) in local language(s):Östanmossagruvan (Östanmossgruvan), Röbergsfältet , Norberg, Västmanland, Sverige

The Östanmossa mine produced iron ore from a skarn in the period from 1859 to 1934. The mine is worked to a depth of 114.9m. The Östanmossa mine is a Bastnäs-type REE deposits, belonging to the subtype (2) of Sahlström (Norberg type) in that it is enriched in heavy REE (HREE), Y, Mg, Ca, and F. The REE deposits are hosted in skarns associated with marble horizons in a strongly Na, K, and/or Mg-altered, metavolcanic succession.

Östanmossa deposit is the type locality for dollaseite-(Ce).

Mineral List

20 valid minerals. 2 (TL) - type locality of valid minerals.

Regional Geology

This information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This data will improve over time as more accurate maps and data sets are added.

Paleoproterozoic1600 - 2500 MaIgneous: extrusive; Extrusive: intermediate

Felsic and intermediate volcanic rocks

Northern Europe, Svecofennian and Lapland-Kola orogens

Orogen, fold-thrust belt, folded region; Koistinen et al., 2001; Sigmond, 2002; Solli, unpublished compilation, 2007-08; Bergman et al., unpublished revisions, 2007-08

Paleoproterozoic1600 - 2500 MaPaleoproterozoic mixed volcanic, volcaniclastic and sedimentary rocks

Mixed volcanic, volcaniclastic and sedimentary rocks

This designation includes Precambrian iron-formation-bearing sedimentary and volcanic sequences, as well as mixed sedimentary and volcanic or volcaniclastic sequences.

References for regional geology:

Data provided by

J.C. Harrison, M.R. St-Onge, O.V. Petrov, S.I. Strelnikov, B.G. Lopatin, F.H. Wilson, S. Tella, D. Paul, T. Lynds, S.P. Shokalsky, C.K. Hults, S. Bergman, H.F. Jepsen, and A. Solli. Geological map of the Arctic. doi:10.4095/287868. Geological Survey of Canada Map 2159A.

Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Geijer, P. (1926): Norbergite and Fluoborite, two new minerals from the Norberg mining district. Preliminary report. Geologiska Föreningens i Stockholm Förhandlinger. 48, 84-85.

Geijer, P. (1927): Some mineral associations from the Norberg District. Sveriges Geologiska Undersökning, 20, l-32 [first note on dollaseite-(Ce) as "magnesium orthite" from Östanmoss mine]

Peacor, D. R. & Dunn, P. J.: (1988): Dollaseite-(Ce) (magnesium orthite redefined): Structure refinement and implications for F + M2+ substitutions in epidote-group minerals. American Mineralogist. 73: 838- 842

Grew et al. (1991): Dissakisite-(Ce), a New member of the epidote group and the Mg analogue of allanite-(Ce), from Antarctica. American Mineralogist, 76, 1990-1997.

Holtstam, D., Andersson, U.B. (2007): The REE minerals of the Bastnäs-type deposits, South-Central Sweden. Canadian Mineralogist. 45, 1073-1114

Sahlström, Fredrik (2014): Stable Isotope Systematics of Skarn-hosted REE-silicate Magnetite mineralisations in Central Bergslagen, Sweden, Examensarbete vid Institutionen för geovetenskaper Nr 279, 87 pages

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