Database name: |
World Fe-oxide+/-Cu-Au-U (IOCG) deposits |
Compilers: |
Sunil S. Gandhi |
Release date: |
2015-03-04 |
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Deposit name(s): |
Masugnsbyn |
Political location(s): |
Sweden; Province or state: Nörrbotten County; Nearest community: Gällivare (70 km NE) |
Deposit clan (type): |
Iron Skarn-type |
Deposit (sub) types: |
stratiform massive and banded; Junosuando and Nya Isovaara regarded as metasomatic skarn iron deposits, and the other 4 deposits in the 8 km long zone as metamorphosed banded iron ore deposits; Reference: Zitzmann, A. (Editor(s)), 1978: The Iron Ore Deposits of Europe and Adjacent Areas: Explanatory Notes to the International Map of the Iron Ore Deposits of Europe, 1:2,500,000 (Lists and Tables); International Geological Congress, Commission for the Geological Map of the World, Subcommission for the Metallogenic Map of the World, Bundesanstalt fur Geowissenschaften und Rohstoffe, Postfach 51 01 53, D-3000 Hannover 51, Volume II, 386 p. |
Deposit status: |
significant prospect; Size category: medium |
Geologic province: |
Svecofennian Orogen |
Geologic subprovince: |
Southern Svecofennian |
Geologic district: |
Masugnsbyn (Ore District) |
Commodities: |
Fe |
Mineralization styles: |
stratiform magnetite layers and lenses |
Geological ages: |
Late Paleoproterozoic (mineralization) Late Paleoproterozoic (host rocks) |
Host rocks: |
(1) metamorphic; metasedimentary schist; Metamorphic grade: amphiboliteIndividual lithologies: | limestone dolomite amphibolite |
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Metallogenic signatures: |
Fe-Mn |
Alteration signatures: |
skarn: garnet and diopside; What was altered: calcareous sediments |
Mineralogy: |
(gangue): diopside, garnet (mineralization): magnetite, pyrite |
Qualified comments: |
(Applies to: discovery and development) Discovered in 1642, among the first known iron deposits in Nörrbotten; no mining since 1800; new discoveries after 1920; Junosuando: 27.9 Mt averaging 25 - 30 % Fe, 0.4 - 1.3 % Mn, 0.024 % P, 1.9 % S. 8 km long zone with 6 deposits, from Masugnsbyn northward: Junosuando, Vähäravaara, Välivaara, Vuoma, Isovaara and Nya Isovaara; the largest Junosuando: 3 km long, 100 m wide, 300 m deep. |
References: |
Anonymous, 2000 |
Swedish Database of Mineral Deposits |
Email |
Zitzmann, A. Editor(s)), 1978 |
The Iron Ore Deposits of Europe and Adjacent Areas: Explanatory Notes to the International Map of the Iron Ore Deposits of Europe, 1:2,500,000 (Lists and Tables) |
International Geological Congress, Commission for the Geological Map of the World, Subcommission for the Metallogenic Map of the World, Bundesanstalt fur Geowissenschaften und Rohstoffe, Postfach 51 01 53, D-3000 Hannover 51, Volume II, 386 p. |
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