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): |
Gora Blagodat; Goroblogodat |
Political location(s): |
Russia; Province or state: Sverdlovskaya Oblast; Nearest community: Nizniy Tagil (43 km N) |
Deposit clan (type): |
Kiruna-type |
Deposit (sub) types: |
typical 'exoskarn'; ore bodies gradually smaller away from the intrusive contact; varying amounts of magnetite, garnet, epidote in skarn ore; less common 'variolite' ore has orthoclase and scapolite |
Deposit status: |
producer; Size category: 141 Mt |
Geologic province: |
Uralian Orogen |
Geologic subprovince: |
Tagil Zone / Tagil-Tavda Belt |
Geologic district: |
Kushva |
Commodities: |
Fe; Cu |
Mineralization styles: |
magnetite lenses, stratabound; disseminated magnetite around lenses; variolitic, associated with felsic dykes |
Geological ages: |
Late Silurian (host rocks) Late Silurian - Early Devonian (related magmatics) Late Silurian - Early Devonian (mineralization) |
Tectonic setting: |
ocean plate marginal orogenic belt-arc; convergent; Formal name: Tagil Zone (host rocks) |
Coincident features: |
intrusive contact (east-trending steep contact with Tura Group; deposits occur in a zone from the contact to a kilometre to the north); Coincident feature name: diorite-syenite pluton second order folds (east-dipping strata folded into northeast-trending subsidiary folds with steeper dip of southern limbs); Coincident feature name: second order folds pre-ore fractures (the fractres are parallel to the axes of second order folds and apparently formed during the folding); Coincident feature name: pre-ore fractures post-ore fractures (two sets: northwesterly and southeasterly; resulted in block faulting); Coincident feature name: post-ore fractures |
Regional tectonic structure: |
synclinal structure (deposits on west limb dipping 20 - 30° to the east; strike 300-340° to the north and 010 - 030° to the south) Tectonic structure name: Tura-Tagil syncline |
Host rocks: |
(1) volcanic; mafic-intermediate volcanic rocks (Ludlovian (Late Silurian); andesite-basalt flows); Magma series/sedimentary package/metamorphic group: calc-alkaline; Depositional setting: arc-back arc basin; Metamorphic grade: greenschist-amphiboliteExternal host rock forms: | intercalated flows and volcaniclastic sediments | Internal host rock structures: | interbedding | Individual lithologies: | pyroxene-plagioclase porphyrites (trachybasalt composition of the flows; interbedded volcaniclastic sediments contain limestone) limestone tuff sandstone siltstone | Host rock stratigraphy: | Tura Group |
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Related igneous rocks: |
(1) intrusive; granodiorite-tonalite-diorite suite (diorite-syenite porphyry); Initials: Diorite-syenite Intrusion; Magma series: calc-alkaline; Depositional setting: continentalIndividual lithologies: | diorite-syenite (contact zone with the host Tura Group discordant, easterly and steep; marked by syenitic pophyry dykes and strong alteration) |
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Country rocks: |
(1) mafic-intermediate volcanics; (Late Silurian island arc); Country rock name: Tagil Zone; Metamorphic grade: greenschist-amphiboliteCountry rock protoliths: | andesite-basalt (associated with volcaniclastic sediments and some limestone); Country rock protolith name: Tura Group | Individual lithologies: | trachyandesite-trachybasalt porphyr (plagioclase and pyroxene-plagioclase porphyritic flows, associated volcaniclastics and dykes of Tura Group) |
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Metallogenic signatures: |
Fe-Ti-V-Cu-Co |
Alteration signatures: |
skarn: garnet, epidote; What was altered: volcano-sedimentary host strata potassic alteration: orthoclase; What was altered: feldspar scapolitization: pyroxene-garnet; What was altered: calcareous rocks |
Mineralogy: |
(alteration): garnet, pyroxene, scapolite, calcite, epidote, chlorite, albite, orthoclase, prehnite, zeolite (mineralization): magnetite, pyrite, chalcopyrite, sphalerite, hematite, pyrrhotite, galena, bornite, marcasite, marcasite, mushketovite, apatite, sphene, quartz, fluorite |
Deposit shape: |
zone of stacked tabular bodies and lensesDeposit dimensions: | strike length: 1.5 kilometres length down-dip: 2 kilometres thickness: 0.4 kilometres |
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Qualified comments: |
(Applies to: reserve/resource descriptions) Largest iron deposit of Tagil-Kushva district; 15 stratabound ore lenses 200-930 m long, 2-84 m thick and 530-1600 m long down dip; deposit area 5 km sq; minor amounts of P, Cu, Co, V, Ti, Mn and Zn; reserves in 1974: 141 Mt of ore as measured, and 16 Mt as indicated resources; average grade: 35.5 % Fe; mined from central open pit and a shaft to the south; output of 3.25 Mt in 1955, 1.8 Mt in 1973 |
References: |
Anonymous, 1977 |
Union of Soviet Socialist Republics |
in 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), Edited by Zitzmann, A., 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, p. 218 - 283 |
Herrington, R.; Smith, M.; Maslennikov, V.; Belogub, E.; Armstrong, R., 2002 |
A Short Review of Paleozoic Hydrothermal Magnetite Iron-Oxide Deposits of the South and Central Urals, and their Geological Setting |
Section Eurasia and Africa, in Hydrothermal Iron Oxide Copper-Gold and Related Deposits: A Global Perspective, Volume 2, Edited by Porter, T. M., Australian Mineral Foundation, Adelaide, Australia, PGC Publishing, Adelaide, 377 p, p. 343 - 354 |
Koroteev, V. A.; de Boorder, H.; Necheukhin, V. M.; Sazonov, V. N., 1997 |
Geodynamic Setting of the Mineral Deposits of the Urals |
Tectonophysics, Volume 276, p. 291 - 300 |
Puchkov, V. N., 1997 |
Structure and Geodynamics of Uralian Orogen |
in Orogeny through Time, Edited by Burg, J-P; Ford, M., Special Publication, Geological Society, London |
Sokolov, G. A.; Grigor'ev, V. M., 1977 |
Deposits of Iron |
in Ore Deposits of the USSR, Volume 1, Edited by Smirnov, V. I., Academy of Science, the Union Soviet Socialist Republics, Pitman Publishing Ltd., Pitman House, 39 Parker Street, London WC2B 5PB, U. K., 352 p, p. 7 - 113 |
Zitzmann, A., 1977 |
The Iron Ore Deposits of the Western U. S. S. R. |
Section The Iron Ore Deposits of Europe and Adjacent Areas, in 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 (Text and Figures), Edited by Walther, H. W.; Zitzmann, A., 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 I, 418 p, p. 325 - 391 |
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