Länttä, Kokkola, Central Ostrobothnia, Finlandi
| Regional Level Types | |
|---|---|
| Länttä | Deposit |
| Kokkola | Municipality |
| Central Ostrobothnia | Region |
| Finland | Country |
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Latitude & Longitude (WGS84):
63° 37' 0'' North , 24° 8' 59'' East
Latitude & Longitude (decimal):
Type:
Deposit - last checked 2022
Köppen climate type:
The Länttä deposit was discovered by Suomen Mineraali Oy in the early 1960s. Paraisten Kalkkivuori Oy explored the deposit and carried out diamond drilling in 1963–1967. Pilot testing, metallurgic studies, and tests to manufacture lithium salts were carried out in 1978 and 1980. Partek Oy (previously Paraisten Kalkkivuori) gave up its mining rights in 1982.
Keliber has continued the exploration of the Länttä deposit with diamond drilling programs in 2004–2005 and 2011–2013. Bulk sampling has also been carried out in Länttä for beneficiation tests and metallurgic tests. The latest bulk sampling was conducted in the summer of 2013. About 300 tonnes of ore were mined from two different sections of the main vein.
The pegmatite in Länttä is a typical example of uniform albite-spodumene pegmatite. The deposit consists of two main veins. The maximum thickness of the veins is about ten metres. Small, thinner veins parallel to the main vein occur in the vicinity of the main veins.
Both intermediary-mafic metavolcanites and metamorphic sedimentary rock (metagreywacke, mica schist) occur as host rock in the area. The pegmatite veins run from northeast to southwest and are almost vertical, sloping by 70 degrees towards the southeast. (Source: https://www.keliber.fi/en/geology/deposits/lantta/)
Steeply SE-dipping, NE-SW-aligned sheeted, wavy dykes (c. 1–10 m x 450 m). Locally boudinaged
Concordant layering, metamorphic foliations in wall rock
Partly zoned pegmatites, xenoliths
1.3 Mt @ 1.04 % Li2O, 65 ppm Ta
Keliber has continued the exploration of the Länttä deposit with diamond drilling programs in 2004–2005 and 2011–2013. Bulk sampling has also been carried out in Länttä for beneficiation tests and metallurgic tests. The latest bulk sampling was conducted in the summer of 2013. About 300 tonnes of ore were mined from two different sections of the main vein.
The pegmatite in Länttä is a typical example of uniform albite-spodumene pegmatite. The deposit consists of two main veins. The maximum thickness of the veins is about ten metres. Small, thinner veins parallel to the main vein occur in the vicinity of the main veins.
Both intermediary-mafic metavolcanites and metamorphic sedimentary rock (metagreywacke, mica schist) occur as host rock in the area. The pegmatite veins run from northeast to southwest and are almost vertical, sloping by 70 degrees towards the southeast. (Source: https://www.keliber.fi/en/geology/deposits/lantta/)
Steeply SE-dipping, NE-SW-aligned sheeted, wavy dykes (c. 1–10 m x 450 m). Locally boudinaged
Concordant layering, metamorphic foliations in wall rock
Partly zoned pegmatites, xenoliths
1.3 Mt @ 1.04 % Li2O, 65 ppm Ta
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
6 valid minerals.
Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Beryl | 9.CJ.05 | Be3Al2(Si6O18) |
| ⓘ | Spodumene | 9.DA.30 | LiAlSi2O6 |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Petalite | 9.EF.05 | LiAl(Si4O10) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| Unclassified | |||
| ⓘ | 'Columbite-(Fe)-Columbite-(Mn) Series' | - | |
| ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Li | Lithium | |
| Li | ⓘ Petalite | LiAl(Si4O10) |
| Li | ⓘ Spodumene | LiAlSi2O6 |
| Be | Beryllium | |
| Be | ⓘ Beryl | Be3Al2(Si6O18) |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Beryl | Be3Al2(Si6O18) |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Petalite | LiAl(Si4O10) |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Spodumene | LiAlSi2O6 |
| O | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| O | ⓘ Garnet Group | X3Z2(SiO4)3 |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Beryl | Be3Al2(Si6O18) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Petalite | LiAl(Si4O10) |
| Al | ⓘ Spodumene | LiAlSi2O6 |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Beryl | Be3Al2(Si6O18) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Petalite | LiAl(Si4O10) |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Spodumene | LiAlSi2O6 |
| Si | ⓘ Garnet Group | X3Z2(SiO4)3 |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Mn | Manganese | |
| Mn | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| Fe | Iron | |
| Fe | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
| Nb | Niobium | |
| Nb | ⓘ Columbite-(Fe)-Columbite-(Mn) Series | |
Other Regions, Features and Areas containing this locality
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References
Lynch, Edward P.; Szentpéteri, Krisztián; Andersson, Joel B.H.; Kuusela, Janne; Sadeghi, Martiya; Bauer, Tobias E. (2025) Lithium-caesium-tantalum (LCT) pegmatite mineralization in the Paleoproterozoic central Fennoscandian Shield (Sweden and Finland): A review of geological characteristics and assessment of mineral system commonalities. Ore Geology Reviews, 184. 106739 doi:10.1016/j.oregeorev.2025.106739
Länttä, Kokkola, Central Ostrobothnia, Finland