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Grøsli Mine, Flesberg, Buskerud, Norwayi
Regional Level Types
Grøsli MineMine
FlesbergMunicipality
BuskerudCounty
NorwayCountry

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PhotosMapsSearch
03948260017272076702475.jpg
A 1883 profile of the Grøslie Mine

Grøsli Mine, Flesberg, Buskerud, Norway
02031200017543295796253.jpg
The Grøsli mine

Grøsli Mine, Flesberg, Buskerud, Norway
08640490017619259941541.jpg
The Grøsli mine

Grøsli Mine, Flesberg, Buskerud, Norway
03948260017272076702475.jpg
A 1883 profile of the Grøslie Mine

Grøsli Mine, Flesberg, Buskerud, Norway
02031200017543295796253.jpg
The Grøsli mine

Grøsli Mine, Flesberg, Buskerud, Norway
05983380017543732975695.jpg
The Grøsli mine

Grøsli Mine, Flesberg, Buskerud, Norway
06961480017272076707958.jpg
A 1883 profile of the Grøslie Mine

Grøsli Mine, Flesberg, Buskerud, Norway
02031200017543295796253.jpg
The Grøsli mine

Grøsli Mine, Flesberg, Buskerud, Norway
Latitude & Longitude (WGS84):
59° 51' 28'' North , 9° 33' 30'' East
Latitude & Longitude (decimal):
59.85805,9.55859
GRN:
N40E04
Type:
Mine
Age:
1600 to 1000 Ma
Geologic Time:
Mesoproterozoic
Reference for age:
(2019) Deposit Area 631 - 003. Grøsli gruve. The Ore Database, Geological Survey of Norway.
Köppen climate type:
Dfc : Subarctic climate
Nearest Settlements:
PlacePopulationDistance
Svene296 (2013)7.3km
Prestfoss465 (2014)21.0km
Kongsberg17,667 (2017)21.7km
Vikersund2,448 (2016)27.0km
Veggli292 (2014)30.4km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Buskerud GeologiforeningSolbergelva31km
Mindat Locality ID:
49007
Long-form identifier:
mindat:1:2:49007:5
GUID (UUID V4):
0
Other/historical names associated with this locality:
Steensrup kiisgrube; Kahn-skjerpet
Other Languages:
Norwegian:
Grøsli gruve, Flesberg, Buskerud, Norge


The Grøsli mine (also known as Grøslid Mine or Steensrup's Kiisgrube), located 3 km north of Lampeland, is an abandoned open-pit mine measuring approximately 25 x 15 meters with a depth of 4–8 meters. Its primary ore was pyrrhotite, with significant pyrite content (30–35%), along with minor sphalerite and chalcopyrite. The mine is situated within a quartz-dioritic gneiss, close to its contact with a large body of coarse-grained metagabbro.

Mining at Grøsli reportedly began around 1790, locally known as the Kahn-prospect. Between 1805 and 1815, during the closure of the Kongsberg Silver Mines, Paul Steensrup (1772–1864) initiated mining operations. Steensrup, who later founded the Kongsberg Weapon Factory, utilized zinc from the mine for color pigment production.

Notably, subhedral to euhedral pyrite cubes up to 15 cm in size have been observed embedded in the pyrrhotite ore (Craig et al., 1998). While pyrite crystals are abundant in the mine dumps, they are often heavily weathered and oxidized, leading to their disintegration (Larsen 2025).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


8 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ 'Amphibole Supergroup'
Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ 'Chlorite Group'
ⓘ 'Feldspar Group'
ⓘ Gahnite
Formula: ZnAl2O4
Description: One sample in the collection of Mineralogical Museum of Oslo.
ⓘ Galena
Formula: PbS
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrrhotite
Formula: Fe1-xS
ⓘ Quartz
Formula: SiO2
ⓘ Sphalerite
Formula: ZnS

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘGalena2.CD.10PbS
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘGahnite4.BB.05ZnAl2O4
ⓘQuartz4.DA.05SiO2
Group 9 - Silicates
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified
ⓘ'Amphibole Supergroup'-AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Chlorite Group'-
ⓘ'Feldspar Group'-
ⓘ'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
Hⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
OOxygen
Oⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ GahniteZnAl2O4
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ Garnet GroupX3Z2(SiO4)3
FFluorine
Fⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Alⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ GahniteZnAl2O4
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Siⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ Garnet GroupX3Z2(SiO4)3
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ GalenaPbS
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
Sⓘ SphaleriteZnS
ClChlorine
Clⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
TiTitanium
Tiⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ ChalcopyriteCuFeS2
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
CuCopper
Cuⓘ ChalcopyriteCuFeS2
ZnZinc
Znⓘ GahniteZnAl2O4
Znⓘ SphaleriteZnS
PbLead
Pbⓘ GalenaPbS

Other Databases

Link to Geological Survey of Norway:5980

Other Regions, Features and Areas containing this locality

Baltic Shield (Fennoscandian Shield)Shield
Eurasian PlateTectonic Plate
EuropeContinent
Norway
ScandinaviaRegion

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Hagen O. N. (1882) Reiser for den geologiske Undersøgelse Sommeren 1880 [Travels for the Geological Survey Summer 1880]. Nyt magazin for naturvidenskaberne [New magazine for the natural sciences], 27. 55-76pp.58-59
Craig, J. R., Vokes, F. M., Solberg, T. N. (1998) Pyrite: physical and chemical textures. Mineralium Deposita, 34 (1) 82-101 doi:10.1007/s001260050187
(2019) Deposit Area 631 - 003. Grøsli gruve. The Ore Database, Geological Survey of Norway.
Larsen, Knut Edvard (2025) «15 cm store krystaller» – fra et besøk i Grøsli gruve, Flesberg i Numedal ["15 cm large crystals" – from a visit to Grøsli mine, Flesberg in Numedal]. STEIN. Magasin for populærgeologi, 52 (4). 14-17
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