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THE ORE DATABASE
Occurence 3035 - 037 Botshaugdalen gruve
(Object Id: 15875)
(Last updated: 01.03.2005)

Location
County: Viken Municipality: Eidsvoll (3035)
Map 1:50000: Eidsvoll (1915-1) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 630418 m. North: 6695316 m.
Longitude: 11.3652050 Latitude: 60.3732070
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au Cu
Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Test mining Reserves:
Operating method: Open pit mining Historical production:


Mineralization
Era: Proterozoic Period: Neoproterozoic
Genesis: Hydrothermal vein Form: Plate
Main texture: Fracture filling Min. distribution: Irregular (scattered)
Main grain size: Medium grained (1-3 mm) Main alteration: Sericitisation
Strike/Dip: 38 / 85 Direction:
Plunge:
Stratigraphic classification of host rock
Era: Proterozoic Period: Paleoproterozoic
Province: East Norwegian Basement Province
Geotec.unit: Solør Complex
Tectonic complex: Mylonite zone
Igneous complex:
Group: Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Sericite Subordinate mineral (1-10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Hematite Subordinate mineral (1-10%)
Ore mineral Gold Accessory mineral (<1%)
Ore mineral Bornite Accessory mineral (<1%)
Ore mineral Sphalerite Accessory mineral (<1%)

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Joints/Fractures Strike/Dip :162 / 65 Syn-mineralisation ;...Effect :Controls
Host rock Joints/Fractures Strike/Dip :212 / 85 Syn-mineralisation ;...Effect :Controls
Host rock Joints/Fractures Strike/Dip :224 / 65 Syn-mineralisation ;...Effect :Controls

Information(s) in free text format
Free text
The mine is situated in the forest immediately east of the Botshaugdalen farm. It comprises a an 2 m wide and 8 m long water-filled shaft that according to the size of the spoil heaps, appear to be 5-10 m deep. The shaft and two small pits 10 m and 20 m northwards is connected with trenches exposing the vein system. The shaft has been driven down along a meter-wide zone trending NE-SW which comprises parallel and interconnected quartz veins (0.1-0.3 m thick) inside a zone of gneissic aplite truncating grey granodioritic orthogneisses at the northern margin of the shaft. At the border between aplite and granodiorite the vein system turns to NNE-SSW and then to NW-SE in the first pit to the north. The wall rocks are commonly only weakly sericite-altered in a 0.1-0.3 m wide zone along the vein contact with the exception of areas, where the host-rocks contain networks of thin quartz veins in pyritic sericite alteration. The main quartz veins contain interstices and vein-parallel fractures filled with pyrite, chalcopyrite and specularite (hematite). Analyses of the ores yield up to 10 g/t Au.


The fact sheet was created on 26.10.2021

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