(Last updated: 29.04.2015)
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Norsk versjon | ||||
| THE ???? DATABASE | |||||
| Occurence 0 - 000 FEIL | |||||
| (Object Id: ) (Last updated: 29.04.2015) |
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| Belongs to the Province: Overberget |
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| Location |
| County: | Municipality: | Mangler () |
| Map 1:50000: | Notodden (1714-3) | Map 1:250000: | Skien |
| Coordinate system: | UTM-Zone 33 - EUREF89/WGS84 |
| East: | 533400 m. | North: | 6612950 m. |
| Longitude: | 9.5925670 | Latitude: | 59.6519180 |
| Show on map |
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| Resource |
| Resource Type: | Precious metals (Au,Ag,PGE) | Resource Subtype: | Silver | |
| Element(s): | Ag |
| Importance |
| Raw material meaning: | Little Importance (reg. 18.02.2015) |
| Historical: | Yes , (Confirmed 16.mar.2005 by Agnes Raaness) |
| Resources and production |
| Activity: | Mining | Reserves: | ||
| Operating method: | Underground mining | Historical production: | 3100 thousand tons |
Products |
| Element/product | Crude ore grade or quality | Reg. date | |
| Ag | 193 ppm | 29.04.2015 |
Operations |
| From - To | Activity | Comments | |
| 1623 - 1943 | Regular production | Company/Institution :Kongsberg Sølvverk |
Mineralization |
| Era: | Paleozoic | Period: | Permian | |
| Genesis: | Hydrothermal vein | Form: | Irregular | |
| Main texture: | Fracture filling | Min. distribution: | Irregular (scattered) |
| Main grain size: | Very unevenly grained | Main alteration: |
| Strike/Dip: | Direction: | |||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Proterozoic | Period: | Mesoproterozoic |
| Province: | South Norwegian Basement Province | |
| Geotec.unit: | Kongsberg Complex | |
| Tectonic complex: | ||
| Igneous complex: |
| Group: | Formation: |
Information(s) in free text format |
| Free text |
| The Kongsberg Silver mines were in operation from 1624 to 1957. During the 333 years of mining about 1,350 t of Ag metal was produced from about 130 larger and smaller mines. The annual production was between 2 and 10 tons. Most silver was produced from mines along the socalled Overberget fahlband zone, of which the Kongens Mine alone produced 601 t. The Kongens mine was also the largest and deepest of the silver mines, reaching a depth of more than 1000 m. The mines were worked on silver-bearing calcite veins, and the ore shoots were mainly controlled by the intersection of the veins with sulphide-bearing horizons within the Mesoproterozoic gneisses. These so-called fahlbands (Bugge 1917) are generally rusty, very schistose mica rich schists and gneisses, which are concordant with the country rocks. The rust is due to the weathering of sulphides, mainly pyrite and pyrrhotite, but also subordinate to accessory chalcopyrite, sphalerite, galena, arsenopyrite and cobalt-bearing minerals. The most important of these horizons are the Overberget and Underberget fahlbands, located to the west of Kongsberg and striking north-south. The great majority of the richest silver mines are related to these two zones. The Overberget fahlband is 180-900 m wide and has a length of more than 10 km along strike. |
| Photo(s) from the Deposit area: |
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Bibliography: |
| From NGU's Reference Archive: |
| Bugge, Arne , 1930 |
| Rapport over Kongsberg Sølvverks Gruber. Overberget og underberget. |
| ;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 3244;213 pages |
| Abstract: | |
| Utredningen om tahlbåndene og gangene i Kongsbergfeltet og om gruvene på Underberget og Overberget er basert på Sølverkets gamle og nye litteratur, de foreliggende geologiske detaljkarter og de som undertegnede utarbeidet i tiden 1921 - 1929. I beskrivelsen av gruvene har undertegnede forsøkt å gi en oversikt over hver enkelt gruves historie, verdi og fremtidsmuligheter. |
Name of Locality: 1 |
| (Object Id: 19631 77,01,00) |
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| Location |
| County: | Municipality: | Mangler () |
| Map 1:50000: | Notodden (1714-3) | Map 1:250000: | Skien |
| County: | UTM-Zone 33 - EUREF89/WGS84 |
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| Resource |
| Resource Type: | Precious metals (Au,Ag,PGE) | Resource Subtype: | Silver | |
| Element(s): | Ag |
Name of Locality: 2 |
| (Object Id: 19632 77,02,00) |
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| Location |
| County: | Municipality: | Mangler () |
| Map 1:50000: | Notodden (1714-3) | Map 1:250000: | Skien |
| County: | UTM-Zone 33 - EUREF89/WGS84 |
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| Resource |
| Resource Type: | Precious metals (Au,Ag,PGE) | Resource Subtype: | Silver | |
| Element(s): | Ag |
Name of Locality: 3 |
| (Object Id: 19633 77,03,00) |
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| Location |
| County: | Municipality: | Mangler () |
| Map 1:50000: | Notodden (1714-3) | Map 1:250000: | Skien |
| County: | UTM-Zone 33 - EUREF89/WGS84 |
|
|
| Resource |
| Resource Type: | Precious metals (Au,Ag,PGE) | Resource Subtype: | Silver | |
| Element(s): | Ag |
Name of Locality: 4 |
| (Object Id: 19634 77,04,00) |
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| Location |
| County: | Municipality: | Mangler () |
| Map 1:50000: | Notodden (1714-3) | Map 1:250000: | Skien |
| County: | UTM-Zone 33 - EUREF89/WGS84 |
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| Resource |
| Resource Type: | Precious metals (Au,Ag,PGE) | Resource Subtype: | Silver | |
| Element(s): | Ag |
| The fact sheet was created on 16.04.2024 |
Copyright © 2024 Geological Survey of Norway |