CANADIAN AND WORLD MINERAL DEPOSIT DATABASES
Geological Survey of Canada


Deposit number Country Location Names Commodities
764 Peru (Arequipa) 15.14.27 S -- 074.40.27 W Cobrepampa; Cobrepampa Pluton Cu; Fe; W; Sn
 
Database name: World Fe-oxide+/-Cu-Au-U (IOCG) deposits
Compilers: Sunil S. Gandhi
Release date: 2015-03-04
   
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: none
Host rock stratigraphy:Cobrepampa Pluton / Linga Super-unit
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


Generated 2015-03-04 14:16:23 with GQuery -- 3.7 ADO (3.19..3.22 -- 2008-12-16)
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