Norsk versjon | |||||
THE ORE DATABASE | |||||
Deposit Area 1221 - 007 | |||||
(Last updated 14.mar.2024) |
Name of Deposit Area : Stordø |
(Object Id : 1221,007,00,00) |
Location |
County : | Hordaland (12) | Municipality : | Stord (1221) |
Map 1:50000: | Fitjar (1114-1) | Map 1:250000: | Haugesund |
Marking point: | Longitude: | 5.4226550 | Latitude: | 59.7904410 |
EU89-UTM Zone 32 | (Coordinates IS confirmed) |
X-coord: | 299267 m. | Y-coord: | 6633491 m. |
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Commodity |
Main Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Sub Type: | Sulphides | |
Element(s): | Kis |
Production |
Activity: | Mining | Reserves: | ||
Prod. method: | Underground mining | Production: | 9000 thousand tons | |
Prod. status: | Disused, closed | Volume of dump: |
Importance |
Public: | Little Importance (reg. 18.02.2015) |
Economical: | Minor interest , (Confirmed 28.jun.2001 by Tor Grenne) |
Products |
Element/product | Crude ore grade or quality | |
S | 23 % | |
ZN | 0,28 % |
Operations |
From - To | Activity | Comments | |
1865 - 1904 | Regular production | ||
1906 - 1968 | Regular production | Company/Institution :A/S Stordø Kisgruber |
Mineralization |
Era: | Paleozoic | Period: | Silurian | |
Dating: | Method: | |||
Genesis: | Volcex | Form: | Layer | |
Main texture: | Banded | Min. distribution: | Massive (>50 % ore minerals) |
Main grain size: | Fine grained (< 1 mm) | Main alteration: |
Strike/Dip: | 40 / 70 | Direction: | ||
Plunge: |
Stratigraphic classification of host rock |
Era: | Paleozoic | Period: | Silurian |
Province: | Caledonides | |
Geotec.unit: | Hardangerfjord Nappe Complex | |
Tectonic complex: | ||
Igneous complex: |
Group: | Langevåg | Formation: | Sagvåg |
Mineralogy |
Relationship | Mineral | Amount | |
Gangue mineral | Quartz | Major mineral (>10%) | |
Gangue mineral | Graphite | Subordinate mineral (1-10%) | |
Gangue mineral | Titanite | Accessory mineral (<1%) | |
Ore mineral | Pyrite | Major mineral (>10%) | |
Ore mineral | Pyrrhotite | Subordinate mineral (1-10%) | |
Ore mineral | Sphalerite | Accessory mineral (<1%) | |
Ore mineral | Chalcopyrite | Accessory mineral (<1%) |
Lithology: |
Relationship | Rock | Origin | |
Wall rock | Svartberg | Sedimentary Original rock :Exhalite |
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Metamorphic facies :Greenschist | |||
Wall rock | Jasper | Sedimentary Original rock :Jasper |
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Metamorphic facies :Greenschist | |||
Wall rock | Metasandstone | Sedimentary Original rock :Greywacke |
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Metamorphic facies :Greenschist | |||
Wall rock | Phyllite | Sedimentary Original rock :Argillaceous sediment |
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Metamorphic facies :Greenschist | |||
Wall rock | Greenschist | Extrusive Original rock :Basalt |
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Metamorphic facies :Greenschist |
Structures |
Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
Wall rock | Primary layering | Strike/Dip :40 / 70 | Syn-mineralisation |
Information(s) in free text format |
Free text |
The Stordø deposit is located on the Stord island, and the mine was operated from 1865 to 1968, to a depth of nearly 600 m. The total production was 9 mill.t. of fine-grained pyrite ore with a very low content of base metals, on average 40 % S and 0.26 % Zn in the "export" ore. In addition recent analyses show up to just 0.11 % Cu. The deposit consists of several layers or lenses, 5–50 m thick, over a total stratigraphic thickness of 140 m. There are massive pyrite and magnetite- and/or chert-banded ore. In addition to pyrite there are lesser amounts of pyrrhotite. The stratabound ore bodies are in the sediments of the upper part of the Silurian Langevåg Group (Mundheim Group) which consists of turbidites (green phyllite and sandstone), chert and shallow marine metabasalts of tholeiitic to alkaline character. The lower part of the group is composed of subaerial calc-alkaline volcanic rocks overlain by submarine volcaniclastic breccias, tuffs and chert. |
Bibliography: |
From NGU's Reference Archive: |
Foslie, Steinar , 1926 |
Norges svovelkisforekomster. |
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.127;122 pages |
Abstract: | |
This paper was written in English for the XIV International Geological Congress, Madrid 1926, as a part of its monograph on the Pyrite Resources of the World. The present Norwegian edition has nearly the same content. However, the geological review is a little more extensive, the production statistics have been carried a year forward, to the end of 1925, and some more illustrations are given. The English reader is referred to monograph of the Congress, as only a short statement of the contents is given here. On page 7-13 will be found a short account of the relation of pyrite deposits to the Caledonian mountain chain in Norway. The author maintains, that the main part of its intrusives, and with them the pyrite deposits, belong to the first period of folding processes of the Norwegian mountain chain, probably of Lower Ordovician age. On page 13-18, the characteristic features of the Norwegian pyrite deposits are described, and a summary of the recent views concerning their geology is given. According to these, a small group of pyrite deposits are bio-chemical sediments between basaltic, submarine lava beds, the greatest part of them are magmatic differentiates from gabbroidal intrusives, and a last group are hydromagmatic or hydrothermal deposits. |
Munster, C.A. , 1911 |
Stordø kisfelt. |
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1461;18 pages |
Abstract: | |
Rapporten beskriver geologi, de forskjellige malmtyper, gir kjemiske analyser og drøfter malmkvalitet. Grubene ligger i fyllitt, og selve malmen som er svovelkis (uhyre lite magnetkis) forekommer i ganger av såkalt svartfjell. Dette deles igjen inn i flintfjell og egentlig svartfjell (man får inntrykk av at det er chert). Analyser viser ca. 90% Si02 og det er bitiminøst. Selve malmen inneholder 40 % S, ca 40 % Fe og ca. 4 % C. Forsøk viser at karbonet har lite å si for malmkvaliteten. Det er svært lite Cu og andre forventede metaller i malmen. |
Egge, A.; Munster, C.A. , 1909 |
Rapport over kisforekomstene ved Guldberg, Lilleguldberg og Lerbanken ved Lervik, Stordø i Søndhordaland. |
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 2087;7 pages |
Abstract: | |
Rapporten består av 5-6 rapporter, brev og analyser fra Guldberg. Det framgår at det er mange skjerp i området og fordi det under drift på ett av dem (Guldberg) ble funnet en kobbermalm med dimensjoner 34x12x8m. Denne malm mistet man så (forkastning?) og man håper å finne fortsettelsen. Malmen var rik: 4% Cu, 41 % S men det blir uansett snakk om små tonnasjer. Det er foretatt en slags (EM?) måling uten å finne mer malm. Et par nye gjennomsnittsanalyser fra Guldberg og Dokken (et nærliggende skjerp) ga gehalter på 2,8 og 2,2% Cu. |
Munster, C.A. , 1906 |
Rapport over Stordø svovelkisforekomster. |
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 3685;74 pages |
Abstract: | |
Rapporten gir en meget god oversikt over forholdene ved gruvene fram til 1906, samt detaljerte planer for driften i årene etterpå. Både tidligere eierforhold og produksjon gjennomgås nøye. Deretter kommer to kapitler om geologi og malm som er det samme som rapport nr. 1431 (s.d.), samt detaljert beskrivelse av de enkelte forekomster. Siste halvdel av rapporten går med til planene for framtidig drift. Malmen er altså svovelkis om inneholder ca. 2,2% bitumen. Eksportmalm har ca. 40% S. Produksjonen var beregnet til 70 000 t. pr. år. |
References not to be found in NGU's Reference Archive.: |
Bergverkenes Landssammenslutning gjennom 50 år, 1907-1957 |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
HO0065.01 | Bedrock |
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HO0065.02 | Bedrock |
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HO0065.03 | Bedrock |
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HO0065.04 | Bedrock |
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HO0065.05 | Bedrock |
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HO0065.06 | Bedrock |
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HO0065.07 | Bedrock |
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HO0065.08 | Bedrock |
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HO0065.09 | Bedrock |
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NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
from |
Deposit Area 1221 - 007 Stordø |
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# |
HO0065.01 | Bedrock | 1109 | 402 | 371 | 118 | 341 | .8 | 284.0 |
HO0065.02 | Bedrock | 524 | 378 | 203 | 15 | 142 | 1.2 | 160.0 |
HO0065.03 | Bedrock | 676 | 399 | 78 | 13 | 103 | .3 | 27.0 |
HO0065.04 | Bedrock | 225 | 385 | 40 | -1 | 74 | .3 | 22.0 |
HO0065.05 | Bedrock | 155 | 303 | 25 | 4 | 41 | 1.4 | 7.0 |
HO0065.06 | Bedrock | 586 | 648 | 130 | 30 | 129 | -.3 | 25.0 |
HO0065.07 | Bedrock | 208 | 320 | 62 | 4 | 81 | .4 | 26.0 |
HO0065.08 | Bedrock | 350 | 525 | 152 | 31 | 130 | -.3 | 39.0 |
HO0065.09 | Bedrock | 274 | 291 | 76 | 9 | 110 | .3 | 32.0 |
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Sample No. | Pt# | Pd# | Rh# | As* | Cd* | Ba* | Mo* | Sb* | Bi* |
HO0065.01 | 9.0 | 6.0 | -5.0 | 1412 | 2.3 | 7 | 22.00 | 10 | 20 |
HO0065.02 | 7.0 | -3.0 | -5.0 | 1027 | 2.2 | 4 | 9.00 | 16 | 9 |
HO0065.03 | -3.0 | 3.0 | -5.0 | 470 | 2.8 | 8 | 13.00 | -2 | 10 |
HO0065.04 | -3.0 | 3.0 | -5.0 | 571 | 2.1 | 6 | 5.00 | 7 | 5 |
HO0065.05 | 3.0 | -3.0 | -5.0 | 430 | 2.1 | 9 | 10.00 | -2 | 4 |
HO0065.06 | -3.0 | 11.0 | -5.0 | 729 | 3.9 | 3 | 24.00 | 5 | 16 |
HO0065.07 | -3.0 | -3.0 | -5.0 | 684 | 2.1 | 2 | 4.00 | 12 | 5 |
HO0065.08 | -3.0 | 7.0 | -5.0 | 744 | 3.8 | 3 | 18.00 | 9 | 14 |
HO0065.09 | -3.0 | 3.0 | -5.0 | 843 | 2.7 | 4 | 9.00 | 10 | 3 |
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Sample No. | S% | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* |
HO0065.01 | 34.14 | 56 | 7 | 2368 | 47.83 | 2.00 | -5.00 | -2 | 8.0 |
HO0065.02 | 34.39 | 64 | 14 | 8845 | 31.18 | 2.00 | 8.00 | -2 | 19.0 |
HO0065.03 | 27.63 | 75 | 18 | 7677 | 33.03 | 2.00 | -5.00 | -2 | 26.0 |
HO0065.04 | 35.21 | 57 | 8 | 6143 | 27.73 | -2.00 | -5.00 | -2 | 9.0 |
HO0065.05 | 11.19 | 107 | 42 | 17594 | 24.71 | 5.00 | -5.00 | -2 | 50.0 |
HO0065.06 | 33.72 | 79 | 7 | 801 | 47.11 | -2.00 | -5.00 | -2 | 6.0 |
HO0065.07 | 40.75 | 49 | 6 | 1047 | 27.83 | -2.00 | -5.00 | -2 | 1.0 |
HO0065.08 | 34.70 | 77 | 7 | 806 | 44.11 | -2.00 | 12.00 | -2 | 4.0 |
HO0065.09 | 33.89 | 64 | 10 | 4006 | 26.39 | -2.00 | -5.00 | -2 | 6.0 |
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Sample No. | La* | B* | |||||||
HO0065.01 | 1.00 | -3 | |||||||
HO0065.02 | 4.00 | 3 | |||||||
HO0065.03 | 5.00 | -3 | |||||||
HO0065.04 | 2.00 | -3 | |||||||
HO0065.05 | 12.00 | -3 | |||||||
HO0065.06 | 2.00 | 13 | |||||||
HO0065.07 | -1.00 | 12 | |||||||
HO0065.08 | 1.00 | 11 | |||||||
HO0065.09 | 1.00 | 10 |
The fact sheet was created on 25.04.2024 |
Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
Copyright © 2024 Geological Survey of Norway |