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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Deposit Area 522 - 029 | |||||
| (Last updated 13.mar.2024) | |||||
Name of Deposit Area : Dalen |
| (Object Id : 0522,029,00,00) |
| The deposit area belongs to the Province : Espedalen |
| Location |
| County : | Oppland (05) | Municipality : | Gausdal (0522) |
| Map 1:50000: | Svatsum (1717-1) | Map 1:250000: | Lillehammer |
| Marking point: | Longitude: | 9.6332150 | Latitude: | 61.3778560 |
| EU89-UTM Zone 32 | (Coordinates IS confirmed) |
| X-coord: | 533840 m. | Y-coord: | 6805039 m. |
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| Commodity |
| Main Type: | Ferroalloys (Cr,Ni,Co,V,Mo,W) | Sub Type: | Nickel | |
| Element(s): | Ni Cu Co |
| Production |
| Activity: | Exploration | Reserves: | 7800 thousand tons | |
| Prod. method: | Production: | |||
| Prod. status: | Volume of dump: | |||
| Resource estimat. standard: | CIM/NI 43-101 |
| Importance |
| Public: | International Importance (reg. 13.03.2023) |
| Economical: | Could be significant , (Confirmed 06.jan.2010 by Rolf Lynum) |
Products |
| Element/product | Crude ore grade or quality | |
| CO | 0.02 % | |
| CU | 0.12 % | |
| NI | 0.28 % |
Mineralization |
| Era: | Proterozoic | Period: | Mesoproterozoic | |
| Dating: | Method: | |||
| 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 |
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| Metamorphic facies :Amphibolite | |||
| Host rock | Harzburgite | Intrusive Original rock :Peridotite |
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| 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 18.05.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |