(Last updated: 07.12.2023)
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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Occurence 3301 - 007 Konnerud | |||||
| (Object Id: 5830) (Last updated: 07.12.2023) |
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| Location |
| County: | Buskerud | Municipality: | Drammen (3301) |
| 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 |
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| Resource |
| Resource Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Resource Subtype: | Zinc | |
| Element(s): | Zn Pb Cu Ag Bi |
| Importance |
| Raw material meaning: | Not Assessed (reg. 18.02.2015) |
| Resources and production |
| Activity: | Mining | Reserves: | ||
| Operating method: | Underground mining | Historical production: | 250 thousand tons |
Operations |
| From - To | Activity | Comments | |
| 1731 - 1918 | Regular production | Discontinous production. |
Mineralization |
| 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: | |||
| Plunge: |
| 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: |
Mineralogy |
| 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%) |
Lithology: |
| 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. |
Bibliography: |
| References not to be found in NGU's Reference Archive.: |
| Ihlen P. (1986) The Konnerudkollen skarn deposit - a road log. In Olerud, S. & Ihlen (editors) (1986) Metallogeny associated with the Oslo Paleorift. 7th IAGOD symposium and Nordkalott project meeting. Excusion guide no 1. SGU. |
| The fact sheet was created on 19.12.2025 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2025 Geological Survey of Norway |