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): |
Mina Justa (occurrence name) |
Political location(s): |
Peru; Province or state: Ica; Nearest community: Nazca |
Deposit clan (type): |
Kiruna-type |
Geologic province: |
Andean Orogen |
Geologic subprovince: |
Coastal Cordillera |
Geologic district: |
Caņete-Huarmey Marginal Basin |
Deposit object located: |
stripped area |
Commodities: |
Cu; Fe |
Mineralization styles: |
disseminated (structurally-controlled mineralization); veinlets (structurally-controlled mineralization); vein(s) (structurally-controlled mineralization); breccia-fillings (structurally-controlled mineralization); replacement (Cu replacements of Mt Mantos) |
Geological ages: |
Middle Jurassic - Late Jurassic (host rocks) |
Tectonic setting: |
graben; extensional; Formal name: Marcona (mineralization) |
Coincident features: |
fault(s) (shallow (10-30) to steep (70) ESE to SE dipping faults); Coincident feature name: Repetition Fault System |
Host rocks: |
(1) volcanic; intermediate volcanic rocks; Component: main mineralized zoneExternal host rock forms: | sill(s) intercalated flows and volcaniclastic sediments | Individual lithologies: | andesite (porphyritic) crystal tuffs sandstone (epiclastic) siltstone | Host rock stratigraphy: | Rio Grande Formation formation |
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Alteration signatures: |
albite-actinolite vein/replacement: actinolite+/-magnetite-apatite potassic alteration: K-feldspar magnetite replacement; What was altered: carbonate beds; Component: manto replacement |
Mineralogy: |
(mineralization - oxide / fracture fill): chrysocola, atacamite (mineralization - sulphide / magnetite manto replacement): chalcocite, bornite, chalcopyrite, pyrite |
Qualified comments: |
(Applies to: mineralization) Manto magnetite replacements are hosts to subsequent copper mineralization |
References: |
Thompson, E.; Rath, U.; Baxter, B.; Bell, D.; Kutkevicius, J.; Porcile, F., 2007 |
Mina Justa Deposit, March 2007 |
Presentation, Chariot Resources, Prospectors and Developers Association of Canada, 19 p. |
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