Geological Science and Engineering

Geological Sciences and Geological Engineering
Geological Sciences and Geological Engineering

Geocolloquium Today - Pedro Garcia


Please join us today, Friday, October 2 at 4:30pm in Miller 105 for the second geocolloquium of the term, given by our very own geocolloquium co-chair, Pedro Garcia.

Your geocolloquium chairs,

Pedro, Neil and Judith

 

THE CURAÇÁ VALLEY COPPER DISTRICT, BAHIA STATE, BRAZIL

The first reference on the copper occurrence in the Curaçá Valley, located in the northeastern region of Bahia state (Brazil), appeared in 1874.  In the twentieth century several economic feasibility studies were conducted, which led to the inauguration of the Caraíba open pit mine in 1979. The underground work began in 1986 and continues until today, under the management of Mineração Caraíba S.A. The Caraíba mine is the oldest still-operating copper mine in the country. The regional framework consists of granulitic rocks of the Itabuna-Salvador-Curaçá orogenic belt, composed of metamorphosed Archean  (2.6 Ga) and juvenile Orosirian-Rhyacian (2.1-1.9 Ga) rock types . The copper sulfide mineralization (bornite and chalcopyrite) is associated with mafic-ultramafic bodies (mainly norite and pyroxenite) surrounded by ortho-and paragneisses. The orebodies and host rocks exhibit a high degree of deformation and display evidence of intense hydrothermal event, which led several authors to suggest different genetic models, each one emphasizing particular characteristics of these mineralizations.