Log InRegister
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreOur ScienceMindat Newsletter [Free Download]Contact Us
Donate to MindatSponsor a PageCorporate SponsorshipSponsored Pages
Learning CenterWhat Is a Mineral?The Most Common Minerals on EarthInformation for EducatorsMindat ArticlesMindat Newsletter [Free Download]The ElementsThe Mineral Quiz
Search FormMinerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDMinerals by CountryAlphabetical Mineral IndexAlphabetical Locality SearchMineral Association SearchList of CountriesLocalities Near MePhoto SearchSearch ArticlesSearch GlossaryThe Rock H. Currier Digital LibraryMore Search Options
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
MineralsPetrologyFossilsMeteoritesGeologic Time
Mining CompaniesStatisticsMineral MuseumsClubs & OrganizationsMineral Shows & EventsDevice SettingsTime Machine
Read DiscussionsIdentification Request
Photo SearchPhoto GalleriesSearch by ColourPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Otanmäki Mine, Otanmäki granite, Kajaani, Kainuu, Finlandi
Regional Level Types
Otanmäki MineMine
Otanmäki graniteComplex
KajaaniMunicipality
KainuuRegion
FinlandCountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
05034420017272040979516.jpg
Ilmenite, etc.

Otanmäki Mine, Otanmäki granite, Kajaani, Kainuu, Finland
04481830017272040985890.jpg
Titanium-bearing Magnetite, etc.

Otanmäki Mine, Otanmäki granite, Kajaani, Kainuu, Finland
05034420017272040979516.jpg
Ilmenite, etc.

Otanmäki Mine, Otanmäki granite, Kajaani, Kainuu, Finland
04481830017272040985890.jpg
Titanium-bearing Magnetite, etc.

Otanmäki Mine, Otanmäki granite, Kajaani, Kainuu, Finland
05034420017272040979516.jpg
Ilmenite, etc.

Otanmäki Mine, Otanmäki granite, Kajaani, Kainuu, Finland
04481830017272040985890.jpg
Titanium-bearing Magnetite, etc.

Otanmäki Mine, Otanmäki granite, Kajaani, Kainuu, Finland
Latitude & Longitude (WGS84):
64° 7' 1'' North , 27° 6' 20'' East
Latitude & Longitude (decimal):
64.11722,27.10556
GeoHash:
G#: ue7kbb1tv
GRN:
N43E09
Type:
Mine
Köppen climate type:
Dfc : Subarctic climate
Nearest Settlements:
PlacePopulationDistance
Vuolijoki2,557 (2015)9.3km
Vieremä4,100 (2014)41.0km
Vaala3,652 (2014)51.6km
Sonkajärvi4,819 (2014)54.0km
Kiuruvesi9,730 (2014)57.2km
Mindat Locality ID:
16568
Long-form identifier:
mindat:1:2:16568:3
GUID (UUID V4):
0


A mine for vanadiferous magnetite (Fe,V)3O4, ilmenite and pyrite. Closed 1985. Owned by Rautaruukki Oy. Produced 330,000 tons of ore/year (1982-1984). - The deposit consisted of numerous nearly vertical ore lenses, till 200 m long and 3 till 50 m wide; in a belt, 2 km long. The pure ore contained 38 - 40 % magnetite, 27 - 31 % ilmenite and 1 - 2 % pyrite.

In a concentration plant near the mine magnetite, ilmenite and pyrite concentrates were produced. The magnetite concentrate was in a vanadium factory treated to Fe2O3, sent to the Rahe steel works, and vanadium-pentoxide, sold to the world market. The ilmenite concentrate was shiped to produce white colour. The pyrite resp. its sulphur content was used in the rubber production.

Reopening of the mine is planned. Production should start in 2019. See www.otanmaki.fi for details.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


12 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:

ⓘ 'Allanite Group'
Formula: (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ 'Chlorite Group'
ⓘ 'Columbite-(Fe)-Columbite-(Mn) Series'
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ 'Fergusonite'
Description: U rich
ⓘ Fergusonite-(Y)
Formula: YNbO4
ⓘ Hematite
Formula: Fe2O3
ⓘ 'Hornblende Root Name Group'
Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
ⓘ Ilmenite
Formula: Fe2+TiO3
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Marcasite
Formula: FeS2
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrrhotite
Formula: Fe1-xS
ⓘ Siegenite
Formula: CoNi2S4
ⓘ Titanite
Formula: CaTi(SiO4)O
ⓘ Ulvöspinel
Formula: TiFe2+2O4

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘSiegenite2.DA.05CoNi2S4
ⓘPyrite2.EB.05aFeS2
ⓘMarcasite2.EB.10aFeS2
Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘUlvöspinel4.BB.05TiFe2+2O4
ⓘHematite4.CB.05Fe2O3
ⓘIlmenite4.CB.05Fe2+TiO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘFergusonite-(Y)7.GA.05YNbO4
Group 9 - Silicates
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Unclassified
ⓘ'Chlorite Group'-
ⓘ'Columbite-(Fe)-Columbite-(Mn) Series'-
ⓘ'Hornblende Root Name Group'-◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'Fergusonite'-
ⓘ'Allanite Group'-(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)

List of minerals for each chemical element

HHydrogen
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Hⓘ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
OOxygen
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ Fergusonite-(Y)YNbO4
Oⓘ HematiteFe2O3
Oⓘ IlmeniteFe2+TiO3
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ UlvöspinelTiFe22+O4
Oⓘ Columbite-(Fe)-Columbite-(Mn) Series
Oⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oⓘ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
FFluorine
Fⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
NaSodium
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
AlAluminium
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Siⓘ Allanite Group(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ MarcasiteFeS2
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
Sⓘ SiegeniteCoNi2S4
ClChlorine
Clⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
CaCalcium
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ TitaniteCaTi(SiO4)O
Caⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
TiTitanium
Tiⓘ IlmeniteFe2+TiO3
Tiⓘ TitaniteCaTi(SiO4)O
Tiⓘ UlvöspinelTiFe22+O4
MnManganese
Mnⓘ Columbite-(Fe)-Columbite-(Mn) Series
FeIron
Feⓘ ChalcopyriteCuFeS2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ HematiteFe2O3
Feⓘ IlmeniteFe2+TiO3
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ MarcasiteFeS2
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
Feⓘ UlvöspinelTiFe22+O4
Feⓘ Columbite-(Fe)-Columbite-(Mn) Series
CoCobalt
Coⓘ SiegeniteCoNi2S4
NiNickel
Niⓘ SiegeniteCoNi2S4
CuCopper
Cuⓘ ChalcopyriteCuFeS2
YYttrium
Yⓘ Fergusonite-(Y)YNbO4
NbNiobium
Nbⓘ Fergusonite-(Y)YNbO4
Nbⓘ Columbite-(Fe)-Columbite-(Mn) Series

Other Regions, Features and Areas containing this locality

Baltic Shield (Fennoscandian Shield)Shield
Eurasian PlateTectonic Plate
EuropeContinent

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

Bowie, S. H. U, Kvalheim, A., Haslam, H. W. (eds): Mineral Deposits of Europe, vol. 1: Northwest Europe; The Inst. of Mining and Metallurgy and the Mineralogical Society, London, 1978; S. 80 ff
www.otanmaki.fi (n.d.) http://www.otanmaki.fi
Mining Annual Review (1985)- 79, 96 & 506
en.gtk.fi (2013) http://en.gtk.fi/ExplorationFinland/Moreinfo/otanmaki.html
Al-Ani, Thair, Ferenc Molnár, Panu Lintinen, and Seppo Leinonen. (2018) "Geology and Mineralogy of Rare Earth Elements Deposits and Occurrences in Finland" Minerals 8, no. 8: 356. https://doi.org/10.3390/min8080356
Quick NavTopMineral ListRock TypesOther RegionsReferences
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: October 21, 2026 08:53:11 Page updated: August 5, 2025 06:50:25
Go to top of page