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): |
Cobrepampa; Cobrepampa Pluton |
Political location(s): |
Peru; Province or state: Arequipa; Nearest community: Lima (550 km SE) |
Deposit clan (type): |
Kiruna-type |
Deposit (sub) types: |
alkaline hydrothermal; genetially related to the main Coastal intrusive suite, known as the Linga Super-unit |
Deposit status: |
past producer; Size category: 5 Mt |
Geologic province: |
Andean Orogen |
Geologic subprovince: |
Coastal Cordillera |
Geologic district: |
Arequipa Segment of Coastal Batholith |
Commodities: |
Cu; Fe; W; Sn |
Mineralization styles: |
veins |
Geological ages: |
Middle Cretaceous - Late Cretaceous (host rocks) |
Tectonic setting: |
continental marginal orogenic belt-unqualified; convergent; Formal name: Andean Coastal Batholith (host rocks) |
Coincident features: |
host pluton (vein zone along the central part of NW oriented pluton; steep to subvertical veins dip ENE); Coincident feature name: Cobrepampa Pluton |
Regional tectonic structure: |
northwest-trending cooling fractures in pluton (mineralization in part synchronous with cooling of pluton) Tectonic structure name: Cobrepampa Monzonite Pluton |
Host rocks: |
(1) intrusive; gabbro-diorite suite (alkaline monzonite pluton); Magma series/sedimentary package/metamorphic group: alkaline; Depositional setting: continental; Metamorphic grade: noneHost rock stratigraphy: | Cobrepampa Pluton / Linga Super-unit |
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Related igneous rocks: |
(1) intrusive; granite suite (part of Coastal Batholith); Initials: Linga Super-unit; Magma series: calc-alkaline; Depositional setting: continental |
Country rocks: |
(1) mafic-intermediate volcanics; (shoshonitic affinity); Country rock name: Cañete-Huarmey Marginal Basin; Metamorphic grade: burial |
Metallogenic signatures: |
Cu-Fe-W-Sn |
Alteration signatures: |
oxidation and supergene enrichment: formation of copper and iron oxides near surface a; What was altered: sulphides in ore zone sericitization: quartz and sericite; What was altered: wall rock |
Mineralogy: |
(alteration): copper oxides (oxidation zone), iron oxides (oxidation zone), k-feldspar, garnet (gangue): clinopyroxene, actinolite, quartz, apatite, tourmaline, biotite, chlorite, calcite (supergene alteration): chalcocite, covellite, digenite (vein mineralization): chalcopyrite, bornite, pyrite, specularite, magnetite, sphalerite |
Qualified comments: |
(Applies to: discovery and development) District produced copper on small scale from the late 1950s to early 1960s; production plus reserves are estimated to total in the order of 3 to 5 Mt with 2 to 5 % Cu, 0.5 oz/t Ag and Au as byproducts. |
References: |
Hudson, C., 1974 |
Metallogenesis as related to Crustal Evolution in S.W. Central Peru |
Ph. D. Thesis, University of Liverpool, U.K. |
Injoque, J., 2002 |
Fe Oxide-Cu-Au Deposits in Peru: An Integrated View |
Section The Americas, 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. 97 - 114 |
Sillitoe, 2003 |
Iron Oxide-Copper-Gold Deposits: An Andean View |
Mineralium Deposita, Volume 38, p. 787 - 812 |
Valera, J., 1982 |
Estudio geológico de la Veta Cobrepampa en el Distrito Minero de Acari-Ariquipa |
Tesis de Ingeníero Geológo, Universidad Nacional de Ingeniera, Lima, Perú |
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