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): |
Tjårrojåkka; Tjårrojåkka Fe |
Political location(s): |
Sweden; Province or state: Nörrbotten County; Nearest community: Gällivare |
Deposit clan (type): |
Kiruna-type |
Deposit (sub) types: |
stratabound but quite irregular ore bodies and ore breccia in a pophyritic felsic volcanic sequence; 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: 52.6 Mt |
Geologic province: |
Svecofennian Orogen |
Geologic subprovince: |
Northern Svecofennian |
Geologic district: |
Ekströmsberg (Ore District) |
Commodities: |
Fe; P |
Mineralization styles: |
massive; breccia |
Geological ages: |
Late Paleoproterozoic (mineralization) Late Paleoproterozoic (host rocks) |
Tectonic setting: |
continental marginal basin-foreland; convergent; Formal name: late Svecofennian back arc extensional basin (host rocks) |
Host rocks: |
(1) volcanic; mafic-intermediate volcanic rocks (associated with syenite porphyry sill or flow); Magma series/sedimentary package/metamorphic group: calc-alkaline; Depositional setting: continental; Metamorphic grade: greenschistHost rock protoliths: | basalt-andesite (dominantly andesitic); Host rock protolith name: Porphyrite Group | Host rock stratigraphy: | Porphyrite Group |
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Metallogenic signatures: |
Fe-P-Cu |
Alteration signatures: |
skarn: diopside, tremolite; What was altered: mafic to intermediate volcanic rocks scapolitization: scapolite ; What was altered: calcic plagioclase chloritization: chlorite; What was altered: mafic silicates epidotization: epidote; What was altered: mafic silicate |
Mineralogy: |
(alteration): scapolite, tremolite, diopside, chlorite, epidote (gangue): feldspar, muscovite, quartz, biotite (mineralization): magnetite, actinolite, chalcopyrite, bornite |
Deposit shape: |
tabularDeposit dimensions: | length: 250 metres thickness: 100 metres depth: 150 metres |
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Qualified comments: |
(Applies to: discovery and devlopment) Discovered in 1963 by geophysical methods; estimated resources of 52.6 Mt of ore averaging 51.5 % Fe and 0.8 % P; 400 m to the WNW the Tjårrojåkka Cu deposit (DEPNO. 4) has estimated 13 Mt of ore containing 0.43 % Cu, hosted by wallrock-magnetite contact breccia with bornite, chalcopyrite and gold; no mining done to date. |
References: |
Anonymous, 2000 |
Swedish Database of Mineral Deposits |
Email |
Carlon, C. J., 2000 |
Iron Oxide Systems and Base Metal Mineralisation in Northern Sweden |
Section Eurasia and Africa, in Hydrothermal Iron Oxide Copper-Gold and Related Deposits: A Global Perspective, Volume 1, Edited by Porter, T. M., Australian Mineral Foundation, Adelaide, Australia, PGC Publishing, Adelaide, 349 p, p. 283 - 296 |
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. |
52.6 million metric tons ore; Combined with production?: no; Provisional entry?: yesGrade-commodity information: | Fe: 51.5 percent | Reference: Anonymous, 2000: Swedish Database of Mineral Deposits; Email Percent weights allocated to deposit: 100.0% |