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Occurence 0 - 000 FEIL | |||||
(Object Id: ) (Last updated: 19.12.2022) |
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Location |
County: | Municipality: | Mangler () |
Map 1:50000: | Nannestad (1915-3) | Map 1:250000: | Hamar |
Coordinate system: | UTM-Zone 33 - EUREF89/WGS84 |
East: | 603300 m. | North: | 6674600 m. |
Longitude: | 10.8629700 | Latitude: | 60.1937240 |
Show on map |
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Resource |
Resource Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Resource Subtype: | Zinc | |
Element(s): | Zn |
Importance |
Raw material meaning: | Not Assessed (reg. 18.02.2015) |
Resources and production |
Activity: | Pitting | Reserves: | ||
Operating method: | Historical production: |
Mineralization |
Era: | Paleozoic | Period: | Permian | |
Genesis: | Skarn formation | Form: | Lens | |
Main texture: | Structureless | Min. distribution: | Semi-massive (20-50 % ore minerals) |
Main grain size: | Fine grained (< 1 mm) | Main alteration: | Skarn formation |
Strike/Dip: | Direction: | |||
Plunge: |
Stratigraphic classification of host rock |
Era: | Paleozoic | Period: | Ordovician |
Province: | Oslo Region | |
Geotec.unit: | Akershus Graben | |
Tectonic complex: | ||
Igneous complex: | Nordmarka-Hurdal Batholith |
Group: | Formation: |
Mineralogy |
Relationship | Mineral | Amount | |
Gangue mineral | Pyroxene | Major mineral (>10%) | |
Gangue mineral | Calcite | Accessory mineral (<1%) | |
Ore mineral | Sphalerite | Major mineral (>10%) | |
Ore mineral | Pyrrhotite | Subordinate mineral (1-10%) | |
Ore mineral | Pyrite | Subordinate mineral (1-10%) |
Lithology: |
Relationship | Rock | Origin | |
Host rock | Hedenbergite skarn | Sedimentary Original rock :Limestone |
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Metamorphic facies :Contact | |||
Wall rock | Hornfels | Sedimentary Original rock :Argillaceous sediment |
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Metamorphic facies :Contact |
Information(s) in free text format |
Free text |
Forekomsten ligger i en ca. 500x150 m stor xenolitt av hornfels, som er omdannede kambriske til undersiluriske alunskifre med kalksteinslinser, i forskjellige permiske dypbergarter i lia vest for Bjertnessjøen. Den består av en tilnærmet fullstendig gjengrodd dagskjæring og innerst i denne sees kun svart hornfels i veggen som er opptil 6 m høy. Fin- til grovkornet sinkblende finnes disseminert og i semimassive årer og linser i pyroksenskarn i blokker på tippen som har et volum på ca. 70 kbm. |
Bibliography: |
From NGU's Reference Archive: |
Olerud, Svein , 1984 |
Metallogeny of the Elsjø area, northern Oslo Region, Norway. |
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.64 (4);325-334 pages |
Abstract: | |
The Elsjø area is situated in the northern part of the Oslo Region and consists of a 2 km² inlier of Palaeozoic metasediments. Cambro-Ordovician shales and limestones are enclosed in Permian intrusives and are contact metamorphosed and altered by metasomatic processes. The present investigation has defined three mineralisation types of interest: The heavy-metal content of the Alum shale, sphalerite-bearing skarn lenses within the Alum shale and molybdenite mineralisation in the underlying Permian granites. The Alum shale of the Elsjø area has a maximum thickness of more than 150 metres as a result of overthrusting and folding during the Caledonian orogeny. The highest heavy-metal content is in Upper Cambrian strata. The greatest average content is in 10.6 m thick layer with 160 ppm U, 200 ppm Mo, 930 ppm V, 11.6 % C and 2.8 % S. The Alum shale also contains lenses of hedenbergite-garnet skarn lenses with sphalerite mineralisation; these are alteration products of marble lenses in the shale. Similar sphalerite-bearing skarn mineralisation is also found in other stratigraphic levels on shear zones. The Palaeozoic sedimentary rocks are underlain by three types of Permian granites. Molybdenite occurs as scattered disseminations in the phyllic alteration zones of the granite. Propylitic alteration is common in both the underlying intrusives and in the Palaeozoic sediments. The molybdenite mineralisation has similarities with porphyry molybdenum type occurrences, but can also be interpreted as a roof zone mineralisation in the granites. |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
JS-OS2148 | Dump |
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NB! All analyse values are shown at the end of the printout.: |
Name of Locality: Knepphauglia sør |
(Object Id: 38201 10,01,00) |
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Location |
County: | Municipality: | Mangler () |
Map 1:50000: | Nannestad (1915-3) | Map 1:250000: | Hamar |
County: | UTM-Zone 33 - EUREF89/WGS84 |
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Resource |
Resource Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Resource Subtype: | Zinc | |
Element(s): | Zn |
Resources and production |
Activity: | Pitting | Reserves: | ||
Operating method: | Historical production: |
Mineralogy |
Relationship | Mineral | Amount | |
Gangue mineral | Pyroxene | Major mineral (>10%) | |
Gangue mineral | Calcite | Subordinate mineral (1-10%) | |
Ore mineral | Sphalerite | Major mineral (>10%) | |
Ore mineral | Pyrite | Subordinate mineral (1-10%) | |
Ore mineral | Pyrrhotite | Subordinate mineral (1-10%) |
Lithology: |
Relationship | Rock | Origin | |
Host rock | Hedenbergite skarn | Sedimentary Original rock :Limestone |
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Metamorphic facies :Contact | |||
Wall rock | Hornfels | Sedimentary Original rock :Argillaceous sediment |
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Metamorphic facies :Contact |
Information(s) in free text format |
Free text |
Forekomsten består av en 10 m lang og 2-3 m bred dagkjæring med retning 235° og har en 3 m høy vegg i SV. I skjerpet finnes svart hornfels, grafitt-granatskarn (gravhola), svartskifer og kalkstein i veksling, men det er lite sulfidmineralisering. Sinkblende årer i pyroksenskarn og massiv magnetkis med spredte korn av svovelkis finnes i blokker på tippen som har et volum på ca. 60 kbm. |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
JS-OS2146 | Dump |
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JS-OS2147 | Dump |
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NB! All analyse values are shown at the end of the printout.: |
The fact sheet was created on 29.03.2024 |
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