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THE ORE DATABASE | |||||
Deposit 4622 - 008 Gravdal | |||||
(Object Id: 4782) (Last updated: 13.03.2024) |
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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 |
Show on map |
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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 |
Products |
Element/product | Crude ore grade or quality | Reg. date | |
Cu | 1,35 % | 13.03.2024 | |
S | 40 % | 13.03.2024 | |
Zn | 0,7 % | 13.03.2024 |
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 | |
1953 - 1963 | Regular production | Company/Institution :A/S Stordø Kisgruber |
Mineralization |
Era: | Paleozoic | Period: | Ordovician | |
Genesis: | Volcex | Form: | Layer | |
Main texture: | Massive | Min. distribution: | Massive (>50 % ore minerals) |
Main grain size: | Fine grained (< 1 mm) | Main alteration: | Chloritisation |
Strike/Dip: | Direction: | |||
Plunge: |
Stratigraphic classification of host rock |
Era: | Paleozoic | Period: | Ordovician |
Province: | Caledonides | |
Geotec.unit: | Hardangerfjord Nappe Complex | |
Tectonic complex: | Varaldsøy 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%) |
Lithology: |
Relationship | Rock | Origin | |
Host rock | Greenstone | Extrusive Original rock :Basalt |
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Metamorphic facies :Greenschist |
Structures |
Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
Host rock | Fold axis | Dir./Plunge :225 / 15 | Post-mineralisation ;...Effect :Modifies |
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 2.5 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. |
Photo(s) from the Deposit area: |
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Bibliography: |
From NGU's Reference Archive: |
Bluett-Newton, A.; Torkelsen, I. , 1914 |
Report on the Gravdal Copper pyrites mines. |
;Norges geologiske undersøkelse;TEKNISK RAPPORT;Bergarkivet; No.BA 1452;8 pages |
Abstract: | |
Rapporten beskriver gruvetekniske forhold. |
Borchgrevink, H. K. , 1924 |
Gravdal kobbergrube. |
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 3407;5 pages |
Abstract: | |
Malmen omtales som lag av kompakt svovelkismalm og impregnasjoner i klorittskifer. Kopperinnholdet er lavt og mektigheten er under 1,5m. |
Foslie, S. , 1916 |
Report on the Gravdal sulphur-and copper mines, Hardanger, Norway. |
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1764;16 pages |
Abstract: | |
Rapporten beskriver geologi, malmgehalter og malmproduksjon. Mineraliseringene består av kobberkisholdig svovelkis som bånd og impregnasjoner i kaledonsk kvarts-kloritt skifer. |
Myhra, R. , 1961 |
Gravdal (Bergedal) Grube. |
;Norges geologiske undersøkelse;TEKNISK RAPPORT;Bergarkivet; No.BA 3406;2 pages |
Abstract: | |
Rapporten gir opplysninger om driftsperioder og malmproduksjon. |
Hill, A.; Stewart , 1920 |
Gravdal grube. Plankart og gruveprofil 1:250, 1:1 000 |
;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 409 |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
GRAVDAL-01 | Dump |
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GRAVDAL-02 | Bedrock |
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GRAVDAL-03 | Bedrock |
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NB! All analyse values are shown at the end of the printout.: |
Name of Locality: Undersøkelsesstoll |
(Object Id: 38804 8,01,00) |
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Location |
County: | Vestland | Municipality: | Kvam (4622) |
Map 1:50000: | Varaldsøy (1215-2) | Map 1:250000: | Bergen |
Coordinate system: | EU89-UTM Zone 32 |
East: | 327717 m. | North: | 6668582 m. |
Longitude: | 5.8994770 | Latitude: | 60.1178840 |
Show on map |
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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 |
Resources and production |
Activity: | Exploration | Reserves: | ||
Operating method: | Historical production: |
Information(s) in free text format |
Free text |
Undersøkelsesstoll ca. 40 m lang på tvers av strøket. Går sørøstover fra gruveveien. Lengst inne ca. 20-30 cm sone med kvarts-kloritt-(sericitt) med spredt pyritt. Sannsynligvis fortsettelsen av malmsonen. |
Analyse Results |
from |
Deposit Area 4622 - 008 Gravdal |
Element analyses |
( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.) |
Sample No. | Sample Type | Cu* | Zn* | Pb* | Co* | Ni* | Ag* | Au# |
GRAVDAL-01 | Dump | 30700 | 28000 | 496 | 195 | 23 | 13.2 | 243.0 |
GRAVDAL-02 | Bedrock | 1640 | 1930 | 130 | 292 | 250 | 18.4 | 310.0 |
GRAVDAL-03 | Bedrock | 66200 | 5320 | 350 | 348 | 11 | 37.9 | 514.0 |
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Sample No. | As* | Cd* | Ba* | Mo* | Sn* | Sb* | Bi* | Se* | Ga* |
GRAVDAL-01 | 276 | 70.5 | -10 | 21.50 | 6 | 3 | 43 | 48.00 | 15.65 |
GRAVDAL-02 | 60 | 13.2 | -10 | 38.40 | 2 | 1 | 12 | 60.00 | 0.92 |
GRAVDAL-03 | 86 | 36.6 | -10 | 14.20 | 3 | 1 | 208 | 106.00 | 0.71 |
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Sample No. | Ge* | In* | S% | V* | Cr* | Mn* | Fe% | Th* | U* |
GRAVDAL-01 | 0.31 | 8.72 | 9.99 | 74 | 8 | 132 | 40.40 | 0.03 | 0.30 |
GRAVDAL-02 | 0.40 | 1.43 | 9.99 | 8 | 5 | 75 | 36.40 | 0.01 | 0.40 |
GRAVDAL-03 | 0.59 | 3.82 | 9.99 | 2 | 7 | 58 | 27.90 | 0.02 | 0.50 |
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Sample No. | W* | Rb* | Sr* | Y* | Zr* | Nb* | Ta* | Cs* | La* |
GRAVDAL-01 | 1 | 0.4 | 0.7 | 0.5 | 1 | 0.10 | -0.05 | -0.05 | -0.50 |
GRAVDAL-02 | -0 | 0.1 | 10.0 | 0.5 | -1 | -0.10 | -0.05 | -0.05 | -0.50 |
GRAVDAL-03 | 0 | 0.1 | 2.3 | 0.6 | 1 | 0.10 | -0.05 | -0.05 | -0.50 |
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Sample No. | Ce* | Li* | Be* | P* | Sc* | Ti* | Te* | Hf* | Re* |
GRAVDAL-01 | 0.26 | -0 | -0 | -10 | 0.70 | 50 | 72.00 | -0.10 | 0 |
GRAVDAL-02 | 0.16 | -0 | -0 | 10 | 0.30 | -50 | 21.10 | -0.10 | 0 |
GRAVDAL-03 | 0.54 | -0 | -0 | -10 | 0.50 | -50 | 223.00 | -0.10 | 0 |
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Sample No. | Tl* | ||||||||
GRAVDAL-01 | 1 | ||||||||
GRAVDAL-02 | 1 | ||||||||
GRAVDAL-03 | 0 |
The fact sheet was created on 19.04.2024 |
Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
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