Romsåsen Ni Mines, Kykkelsrud, Askim, Indre Østfold, Østfold, Norwayi
| Regional Level Types | |
|---|---|
| Romsåsen Ni Mines | Group of Mines |
| Kykkelsrud | Village |
| Askim | Municipality (Former) |
| Indre Østfold | Municipality |
| Østfold | County |
| Norway | Country |
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Latitude & Longitude (WGS84):
59° 35' 19'' North , 11° 6' 25'' East
Latitude & Longitude (decimal):
Type:
Group of Mines
Age:
2300 to 1600 Ma
Geologic Time:
Reference for age:
Geological Survey of Norway (NGU). The Ore Database (Malmdatabasen). Deposit Area 124 - 002. Roms
Köppen climate type:
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Follo Geologiforening | Ås | 20km |
| Steinklubben | Skjetten | 43km |
| Fredrikstad og Omegn Geologiforening | Kråkerøy | 48km |
| Vestfold Geologiforening | Holmestrand | 49km |
Mindat Locality ID:
246399
Long-form identifier:
mindat:1:2:246399:8
GUID (UUID V4):
12e42272-71f1-46fd-9976-ec3d600880c9
Other Languages:
Norwegian:
Romsås nikkelgruver, Kykkelsrud, Askim, Indre Østfold, Østfold, Norge
Located at Kykkelsrud 4 km of Askim. The mines is now a touristic attraction.
Close to the orebody and the mines, a popular rock locally called "potetstein" (potatostone) occurs. The rock is now protected by law, and collecting this rock is strictly forbidden. The rock, is a norite ("kulenoritt" is the technical term used in Norwegian literature) and consist mainly of nut- to potato-sized spheres of radiating aggregates of bronzite crystals.
Historically, the company Roms Nikkelverk commenced mining on the Romsås deposit in 1866 and maintained continuous activity until 1876, when the deposit closed and never came into production again. Total ore production from the Romsås deposit was roughly estimated at 13,205 tons with a nickel content of about 125–130 t. The average ore grade at Romsas was 1.07 wt% Ni (+ Co) and 0.4 wt% Cu.
The Romsås intrusion is an almost 1 km-long intrusion with rounded shape displaying an approximately NW-SE elongation. The intrusion comprises undifferentiated quartz-norite with local orbicular texture. The host rock to the intrusion is a garnet-biotite-quartz gneiss, but the relationship between the intrusion and host rock is not well exposed in the field. Four old mining adits, previously used for Ni sulfide mining, are still preserved around the intrusion. The orbicular quartz-norite occurs in mostly 5- to 10-m-long zones within the intrusion and is characterized by nodules, of approximately 10 cm in diameter, comprising plagioclase and orthopyroxene. The orbicular zones grade progressively into a medium-grained quartz-norite, which does not contain nodules. The zones containing the orbicular textures are protected sites, and thus sampling is not allowed. Ni-Cu-Co mineralization comprising disseminated, net-textured and massive sulfides.
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
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 DiagramDetailed Mineral List:
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Cobaltpentlandite | 2.BB.15 | Co9S8 |
| ⓘ | Pentlandite | 2.BB.15 | (NixFey)Σ9S8 |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ | Enstatite | 9.DA.05 | Mg2Si2O6 |
| ⓘ | var. Bronzite | 9.DA.05 | (Mg,Fe2+)2[SiO3]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 |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
| ⓘ | 'Orthopyroxene Subgroup' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | Oxygen | |
| O | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | ⓘ Enstatite | Mg2Si2O6 |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
| O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| O | ⓘ Garnet Group | X3Z2(SiO4)3 |
| F | Fluorine | |
| F | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Na | Sodium | |
| Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Mg | ⓘ Enstatite | Mg2Si2O6 |
| Mg | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
| Al | Aluminium | |
| Al | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | Silicon | |
| Si | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | ⓘ Enstatite | Mg2Si2O6 |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
| Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | ⓘ Garnet Group | X3Z2(SiO4)3 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Cobaltpentlandite | Co9S8 |
| S | ⓘ Pentlandite | (NixFey)Σ9S8 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Cl | Chlorine | |
| Cl | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| K | Potassium | |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Ti | Titanium | |
| Ti | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | Iron | |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Pentlandite | (NixFey)Σ9S8 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Fe | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
| Co | Cobalt | |
| Co | ⓘ Cobaltpentlandite | Co9S8 |
| Ni | Nickel | |
| Ni | ⓘ Pentlandite | (NixFey)Σ9S8 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to Geological Survey of Norway: | 124 - 002 |
|---|
Other Regions, Features and Areas containing this locality
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References
Andresen, Unni, Sørlie, Thor (2009) Romsåsen gruver. STEIN. Magasin for populærgeologi, 36 (2) 20-25
Larsen, Knut Edvard (2009) Portrett av en stein: Kulenoritt. STEIN. Magasin for populærgeologi, 36 (2) 27
[1]Mansur, Eduardo T., Sandstad, Jan Sverre, Slagstad, Trond, Miranda, Ana Carolina R., Dare, Sarah A.S., Nilsson, Lars Petter (2023) Geology, sulphide geochemistry and geochronology of the Romsås Ni-Cu-Co mineralisation, Norway: Implications for ore formation and regional prospectivity. Lithos, 454. 107244 doi:10.1016/j.lithos.2023.107244
Romsåsen Ni Mines, Kykkelsrud, Askim, Indre Østfold, Østfold, Norway