Norsk versjon
Occurence 3005 - 007 Konnerud
(Object Id: 5830)
(Last updated: 11.10.2017)

County: Viken Municipality: Drammen (3005)
Map 1:50000: Drammen (1814-3) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 562868 m. North: 6622191 m.
Longitude: 10.1181580 Latitude: 59.7328700
Show on map

Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Zn Pb Cu Ag Bi
Raw material meaning: Not Assessed (reg. 18.02.2015)

Resources and production
Activity: Mining Reserves:
Operating method: Underground mining Historical production: 250 thousand tons

From - To Activity Comments
1731 - 1918 Regular production Discontinous production.

Era: Paleozoic Period: Permian
Genesis: Skarn formation Form: Irregular
Main texture: Vein network Min. distribution: Irregular (scattered)
Main grain size: Coarse grained (> 3 mm) Main alteration: Skarn formation
Strike/Dip: Direction:
Stratigraphic classification of host rock
Era: Paleozoic Period: Silurian
Province: Oslo Region
Geotec.unit: Vestfold-Ringerike Graben
Tectonic complex:
Igneous complex: Drammen Batholith
Group: Formation:

Relationship Mineral Amount
Gangue mineral Garnet Major mineral (>10%)
Gangue mineral Pyroxene Major mineral (>10%)
Gangue mineral Quartz Subordinate mineral (1-10%)
Gangue mineral Epidote Subordinate mineral (1-10%)
Gangue mineral Calcite Subordinate mineral (1-10%)
Ore mineral Sphalerite Major mineral (>10%)
Ore mineral Galena Major mineral (>10%)
Ore mineral Bornite Subordinate mineral (1-10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Bismuthinite Subordinate mineral (1-10%)

Relationship Rock Origin
Host rock Skarn
Metamorphic facies :Contact
Wall rock Pelite Sedimentary
Metamorphic facies :Contact
Wall rock Calcite marble Sedimentary
420 mill. years;..Method:Marker Fossils
Metamorphic facies :Contact
Wall rock Marle Sedimentary
Metamorphic facies :Contact

Information(s) in free text format
Free text
The Konnerudkollen Zn-Pb skarn deposit was mined periodically from 1729 until 1913. The ore bodies having a mean content of about 5 % Zn, 0.5 % Pb and 0.5 % Cu were mined by stoping at two main levels. Approximately 250 000 t of ore was mined. The main host rock is skarn related to Upper Silurian limestones and hornfelses and was formed as a result of the intrusion of the Drammen granite batholith. The mineralization consists of sphalerite with subordinate amounts of galena, chalcopyrite and/or bornite and is related to different skarn mineralogies, but mainly garnet- or clinopyroxene-dominated types.

The fact sheet was created on 09.12.2022

Questions or comments regarding the fact sheet can be emailed to:
Copyright © 2022 Geological Survey of Norway