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Deposit 0 - 000 FEIL
(Object Id: )
(Last updated: 13.03.2024)
Belongs to the Province: Espedalen
Location
County: Municipality: Mangler ()
Map 1:50000: Svatsum (1717-1) Map 1:250000: Lillehammer
County: UTM-Zone 33 - EUREF89/WGS84
Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Nickel
Element(s): Ni Cu Co
Importance
Raw material meaning: International Importance (reg. 13.03.2023)

Resources and production
Activity: Exploration Reserves: 7800 thousand tons
Operating method: Historical production:


Products
Element/product Crude ore grade or quality Reg. date
Co 0.02 % 12.10.2017
Cu 0.12 % 12.10.2017
Ni 0.28 % 12.10.2017

Mineralization
Era: Proterozoic Period: Mesoproterozoic
Genesis: Orthomagmatic formation Form: Lens
Main texture: Vein network Min. distribution: Disseminated (<20 % ore minerals)
Main grain size: Medium grained (1-3 mm) Main alteration:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Proterozoic Period: Mesoproterozoic
Province:
Geotec.unit:
Tectonic complex: Espedalen Complex
Igneous complex:
Group: Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Pyroxene Major mineral (>10%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Pentlandite Subordinate mineral (1-10%)

Lithology:
Relationship Rock Origin
Host rock Gabbronorite Intrusive
Original rock :Gabbro norite
Metamorphic facies :Amphibolite
Host rock Harzburgite Intrusive
Original rock :Peridotite
Metamorphic facies :Amphibolite

Information(s) in free text format
Free text
The Espedalen Ni-Cu district is situated in an outlier of the Jotun Nappe Complex and consists of Proterozoic crustal rocks; mainly a high-grade anorthosite-gabbro-troctolite suite. Magmatic Ni-Cu sulphides have been mined in several periods in the region. Copper smelting is documented at Svatsum in 1665–1666 with description of ongoing mining of unknown duration. The first analysis and description of a new Ni-mineral, later named pentlandite, was reported from Espedalen by Scheerer (1845). The findings resulted in two mining periods of nickeliferous pyrrhotite (1846 to 1857 and 1874 to 1878) from Storgruva, Veslegruva and a number of smaller workings, making Espedalen one of the major mining districts at that time (up to 500 workers). An estimated total of about 50.000 tons of ore with 1.0 % Ni, 0.4 % Cu was produced. Modern exploration started in the late 1960s. Sulfidmalm and Norsk Hydro did extensive exploration until 1980. The latest period of exploration by Blackstone Ventures Inc. started in 2003 and has so far resulted in the discovery of two new deposits, Stormyra and Dalen. The inferred resources in the Stormyra deposit is 1.013 mill.t. with 1.09 % Ni, 0.48 % Cu and 0.04 % Co and at Dalen 4.625 mill.t. with 0.29 % Ni, 0.12 % Cu and 0.02 % Co. Drake refined the Mineral Resources at Stormyra (1.16Mt @ 1% Ni, 0.42% Cu & 0.04% Co) and Dalen (7.8Mt @ 0.28% Ni, 0.12% Cu & 0.02% Co) prospects in accordance with JORC (2012).

Bibliography:
References not to be found in NGU's Reference Archive.:
Corfu, F., & Heim, M. 2014. Geology and U–Pb geochronology of the Espedalen Complex, southern Norway, and its position in the Caledonian nappe systems. Geological Society, London, Special Publications, 390(1), 223-239. https://doi.org/10.1144/jgs2019-010


Mansur, E.T., Slagstad, T., Dare, S.A.S. & Sandstad, J.S. 2023. Geology and sulphide geochemistry of the Ni-Cu-Co mineralisation of the Espedalen Complex, Norway: Constraints for the distribution of magmatic sulphides within a variably deformed anorthosite suite. Ore Geology Reviews 161.


Reddick, J., & Armstrong, T. 2009. Technical Report on Resource estimates for Ertelien, Stormyra and Dalen Deposits, Southern Norway. NI43-101 technical report.

The fact sheet was created on 23.04.2024
Copyright © 2024 Geological Survey of Norway