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): |
Ekströmsberg |
Political location(s): |
Sweden; Province or state: Nörrbotten County; Nearest community: Kiruna (30 km WSW) |
Deposit clan (type): |
Kiruna-type |
Deposit (sub) types: |
several tabular, stratabound, stacked ore lenses in stratigraphic zone 160 m thick; 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: 37 Mt; Status comments: discovered in 1907; no mining; average grade 55.9 % Fe and 1.3 % P; ore contains 0.18 % Mn, 0.01-0.06 % S, 1.1-3.5 % Si, 4.2 % CaO, 0.06 % MgO, 1.7 % Al2O3, 0.03-0.29 % Ti and 0.04- 0.06 % V |
Geologic province: |
Svecofennian Orogen |
Geologic subprovince: |
Northern Svecofennian |
Geologic district: |
Ekströmsberg (Ore District) |
Commodities: |
Fe; P |
Mineralization styles: |
massive; banded |
Geological ages: |
Late Paleoproterozoic (mineralization) Late Paleoproterozoic (host rocks) |
Tectonic setting: |
continental marginal arc-fore-arc; convergent; Formal name: late Svecofennian arc (host rocks) |
Coincident features: |
stratification in host sequence (concordant tabular body between volcanic units); Coincident feature name: Kiruna Porphyries |
Host rocks: |
(1) volcanic; felsic volcanic rocks (trachytic and rhyolitic flows); Depositional setting: continental arc; Metamorphic grade: greenschistIndividual lithologies: | quartz porphyry | Host rock stratigraphy: | Kiruna Porphyries |
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Metallogenic signatures: |
Fe-P |
Alteration signatures: |
sericitization: sericite; What was altered: feldspars hematization: hematite; What was altered: magnetite |
Mineralogy: |
(alteration): diopside, muscovite (gangue): calcite, actinolite (mineralization): magnetite, hematite, martite, apatite |
Deposit shape: |
zone of stacked tabular bodies and lensesDeposit dimensions: | strike length: 1,400 metres thickness: 160 metres depth: 500 metres |
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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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Resource data: |
Disclaimer - Reserves/Resource Data
Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources (NRCan) does not warrant or guarantee the accuracy, completeness or fitness for any purpose of Reserve and Resource information (Data) contained in this database, including whether the Data is compliant with any securities regulations or standards, and NRCan does not assume any liability with respect to any damage or loss incurred as a result of the use made of the Data.
Resource and reserve figures are historical in nature. The Data source provided with each set of figures should be cited if the Data are re-reported. |
37 million metric tons ore; Combined with production?: no; Provisional entry?: yesGrade-commodity information: | Fe: 55.9 percent S: 0.032 percent | Reference: Anonymous, 2000: Swedish Database of Mineral Deposits; Email Percent weights allocated to deposit: 100.0% |