Abstract

Clastic sediments which are the host rocks of copper mineralization in the Corocoro district, Bolivia, include west- dipping beds of the Vetas series, in which chalcocite ore bodies occur (mainly in arkose and sandstone zones in the San Marcos formation), and older east-dipping beds of the Ramos series. Native copper is the principal ore mineral in the Ramos beds, and may be a product of oxidation of an earlier mineralization genetically related to igneous activity. The chalcocite ores of the Vetas series are probably of syngenetic sedimentary origin and may have derived their copper content from erosion of the older rocks.

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