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Glomsrudkollen Zinc Mines, Åmot, Modum, Buskerud, Norway
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Photo: ØT
Latitude: 59°52'56"N
Longitude: 9°58'47"E
 
Name(s) in local language(s): Glomsrudkollen gruver, Åmot, Modum kommune, Buskerud fylke, Norge
 
Old mine run on chalcopyrite-pyrrhotite-sphalerite ore. In contact with metamorphic garnet-amphibole-epidote skarn.

In 1870 they started test-mining on sphalerite at Glomsrudkollen on Øståsen in southern Modum. Four or five men started this year the mining, and during one month they got 110 tons of black ore, but despite that they stopped the mining.
In 1899 a Belgian company started test-mining with 20 men. They mined 286 tons ore with 30-50% zinc, the mining ended by the end of the year. In 1907 once again they started mining, and the year after 56 persons worked in the mines.
In 1909 the rights was given to a German company.
The mining at Glomsrudkollen ended in 1921 and in 1928 the mines where sold to an other company, but the mining never started again.

The dumps outside the lower adit (Bunnstollen, see the map) is unfortunately nearly totally removed today used in road constructions. These dumps produced several intetresting specimens in the 1970s-1980s.

Mineral List

Albite
'Albite-Anorthite Series'
Amphibole Supergroup
Anatase
Bianchite
Bismuth
Bismuthinite
Bismutite
Brianyoungite
Brochantite
Calcite
Cassiterite ?
'Chabazite'
Chalcopyrite
'Chlorite Group'
'Clinopyroxene Subgroup'
Cosalite
Covellite
Devilline
Epidote
Fluorite
Galena
Galenobismutite
'Garnet'
Gold
Greenockite ?
Gunningite
Gypsum
Helvine
Hematite
Hemimorphite
Hydrozincite
Ktenasite
'Limonite'
Mackinawite
Magnetite
Malachite
Marcasite
Millerite
Namuwite ?
Pentlandite
var: Argentian Pentlandite
Posnjakite
Pyrite
'Pyroxene Group'
Pyrrhotite
Quartz
Schulenbergite
Serpierite
Siegenite
Smithsonite
Sphalerite
'Stilbite'
Talc
Titanite
'Unnamed (Uric Acid Dihydrate)'
Vesuvianite
Wulfenite
Zincite ?
Zircon


60 entries listed. 50 valid minerals.

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References

Goldschmidt, V.M. (1911): Die Kontaktmetamorphose im Kristianiagebiet . Videnskapsselskapets Skrifter. 1.Mat.-Naturv. Klasse 1911. No 1. Kristiania. 483p

Pedersen, F.(1976): En geologisk undersøkelse af den kontakt metasomatiske zinkmineralsering i Glomsrud- miner, Buskerud fylke, Norge. Unpublished thesis, Geolgisk Institut,University of Århus, Denmark. 73 s.

Mathisen, C.O., Olerud, S. & Eidsvig, P. (1976): Undersøkelser av Statens bergrettigheter 1976. NGU -rapport nr 1430/17A. Geologiske og geofysiske undersøkelser ved Glomsrudkollen, Modum, Buskerud

Raade, G.; Elliott, C.J. & Fejer, E.E. (1977): New data on Ktenasite. Mineralogical Magazine 41, 65-70 [on ktenasite from Glomsrudkollen]

Berg,H.-J. (1990): Etter Neumann. Cosalitt. STEIN 17(2),37

Berg,H.-J. (1990): Etter Neumann. Devillin. STEIN 17(2),37

Berg,H.-J.(1990): Etter Neumann. Anatas. STEIN 17(3),40

Pettersen, B.(1990): En mineral-analyse. STEIN 17(3),39

Raade,G.(1995): Secondary Zn and Cu minerals from contact deposits of the Oslo region, Norway. Bergverksmuseet Skrift nr 9, 18-26

Raade, G. (1997): Secondary Zn and Cu minerals from the Oslo region, Norway: Addendum. Bergverksmuseets Skrift nr 12, 12-13

Nordrum, F.S. (2002): Nyfunn av mineraler i Norge 2001-2002. Norsk Bergverksmuseum Skrift. 20: 78-83

Larsen, K. E. (2003): Mineralspalta. STEIN 30 (1): 20-21 [notice on the find of ktenasite]

Kolitsch, U. & Raade, G. (2011): Uric acid dihydrate: occurrences in Austria and Norway. Norsk Bergverksmuseum Skrift. 46: 25-29

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