Deposit number | Country | Location | Names | Commodities |
29 | Sweden (Nörrbotten County) | 67.52.29 N -- 020.13.34 E | Luossavaara | Fe; P |
Database name: | World Fe-oxide+/-Cu-Au-U (IOCG) deposits | ||||||||||||||||||
Compilers: | Sunil S. Gandhi | ||||||||||||||||||
Release date: | 2015-03-04 | ||||||||||||||||||
Deposit name(s): | Luossavaara | ||||||||||||||||||
Political location(s): | Sweden; Province or state: Nörrbotten County; Nearest community: Kiruna (1 km N) | ||||||||||||||||||
Deposit clan (type): | Kiruna-type | ||||||||||||||||||
Deposit (sub) types: | massive ore body with associated ore breccia along margin; similar to and along the strike of the Kiirunavaara ore body; Reference: Parák, T., 1975: The Origin of Kiruna Iron Ores; Sveriges Geologiska Undersökning, Serie C, Arsbok 69, NR 1, Geological Survey of Sweden, Publication code 709, 209 p. | ||||||||||||||||||
Deposit status: | past producer; Size category: 40.5 Mt ; Status comments: discovered in 1736; small scale mining at the beginning of 19th century; open pit and underground mining from 1898 to 1985; orebody pinches uneconomic width below 400 m | ||||||||||||||||||
Geologic province: | Svecofennian Orogen | ||||||||||||||||||
Geologic subprovince: | Northern Svecofennian | ||||||||||||||||||
Geologic district: | Kiruna (Ore District) | ||||||||||||||||||
Commodities: | Fe; P | ||||||||||||||||||
Mineralization styles: | massive; breccia | ||||||||||||||||||
Geological ages: | Late Paleoproterozoic (mineralization) | ||||||||||||||||||
Tectonic setting: | continental marginal platform-Felsic volcanic sequence; convergent; Formal name: Svecofennian, late stage (country rocks) | ||||||||||||||||||
Coincident features: | stratification in host sequence (concordant tabular body between trachyandesite and rhyodacite units); Coincident feature name: Kiruna Mine series | ||||||||||||||||||
Regional tectonic structure: | monoclinal sequence dipping 50 to 60 degrees to the east-northeast (tilting at the end of Svecofennian orogeny ca. 1880 Ma ) Tectonic structure name: Kiruna Mine series | ||||||||||||||||||
Host rocks: | (1) volcanic; intermediate-felsic volcanic rocks (trachyandesite-rhyodacite); Magma series/sedimentary package/metamorphic group: calc-alkaline; Depositional setting: continental; Metamorphic grade: unmetamorphosed
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Related igneous rocks: | (1) intrusive; syenite suite (footwall of the deposit, extrusive or intrusive); Initials: Lower Kiruna mine sequence
(2) intrusive; granite suite (related to small high level granitoid intrusions); Initials: granophyric dykes
(3) intrusive; granite suite (small high level granitoid intrusions related to the Kiruna Mine series); Initials: granite | ||||||||||||||||||
Country rocks: | (1) felsic volcanics; (rhyolites and dacites); Country rock name: Kiruna Mine series; Metamorphic grade: unmetamorphosed
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Metallogenic signatures: | Fe-P | ||||||||||||||||||
Alteration signatures: | silicification: quartz; What was altered: wall rock chloritization: chlorite; dark green strongly schistose bands, a f; What was altered: wall rock phyllitization: muscovite; What was altered: wall rock carbonatization: calcite; What was altered: wall rock tourmalinization: tourmaline; What was altered: wall rcok barite alteration: barite; What was altered: wall rock allanite replacement: allanite; What was altered: wall rock zircon replacement: zircon; What was altered: wall rock fluorite replacement: fluorite; What was altered: wall rock hematization: hematite after primary magnetite; What was altered: ore | ||||||||||||||||||
Mineralogy: | (alteration): quartz, chlorite, muscovite, calcite, tourmaline, barite, allanite, zircon, fluorite, hematite (mineralization): magnetite, apatite, actinolite | ||||||||||||||||||
Radiometric ages: | Object dated: Mineralogy(1); Age - Ma: 1,888; +6; -6; Dating method: U-Pb; Concentrate: titanite; Source rock: magnetite-titanite dyke; Formal name: ore formation event; Event dated: mineralization; Interpretive comment: magnetite dyke is in footwall breccia zone; data confirm age from Kiirunavaara deposit 1 km to S ; Reference: Romer, R. L.; Martinsson, O.; Perdahl, J. A., 1994: Geochronology of the Kiruna Ores and Hydrothermal Alterations; Economic Geology, Volume 89, p. 1249 - 1261 | ||||||||||||||||||
Deposit shape: | tabular
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References: |
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Production data: | Report period: from 1925 until 1985; 20.5 million metric tons ore; Provisional entry?: no Reference: Anonymous, 2000: Swedish Database of Mineral Deposits; Email Percent weights allocated to deposit: 100.0% | ||||||||||||||||||
Resource data: |
Estimate date: 1985; 40.494 million metric tons ore; Combined with production?: yes; Provisional entry?: yes
Percent weights allocated to deposit: 100.0% |