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THE ORE DATABASE
Deposit 4622 - 008 Gravdal
(Object Id: 4782)
(Last updated: 18.01.2022)

Location
County: Vestland Municipality: Kvam (4622)
Map 1:50000: Varaldsøy (1215-2) Map 1:250000: Bergen
Coordinate system: EU89-UTM Zone 32
East: 327494 m. North: 6668420 m.
Longitude: 5.8956080 Latitude: 60.1163290
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Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Kis Cu
Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)

Resources and production
Activity: Mining Reserves:
Operating method: Underground mining Historical production: 141 thousand tons


Operations
From - To Activity Comments
1864 - 1873 Regular production Manchester company
1915 - 1919 Test mining Company/Institution :Hardanger Copper Mines Ltd.
1943 - 1944 Test mining Company/Institution :A/S Mineral, Gravdal Gruber
1954 - 1964 Regular production Company/Institution :A/S Stordø Kisgruber

Mineralization
Era: Paleozoic Period: Ordovician
Genesis: Volcex Form:
Main texture: Min. distribution:
Main grain size: Main alteration:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Paleozoic Period: Ordovician
Province: Caledonides
Geotec.unit: Hardangerfjord Nappe Complex
Tectonic complex:
Igneous complex:
Group: Formation:

Mineralogy
Relationship Mineral Amount
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Sphalerite Accessory mineral (<1%)

Information(s) in free text format
Free text
Gravdal VMS deposit is located along the contacts between metabasalt and minor bodies of feldspar porphyric rhyodacite, at the same stratigraphic level as Valaheien deposit on Varaldsøy in the Ølve-Varaldsøy Group. The ore body has a thickness 0.5 to 5 m and is a fine grained pyritic banded ore with minor amounts of chalcopyrite. The mine was connected to a harbour by the fiord by a 0.8 km long tunnel. The ore body outcrops at 170 m.a.s.l. and the tunnel is located at 50 m.a.s.l. by the mine.


The fact sheet was created on 24.01.2022

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