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Published in:
2005 | OriginalPaper | Chapter
Geochemical process model for the Mt Isa Cu-Co-Ag deposits
Authors : Andy Wilde, Melissa Gregory, Robert Duncan, Klaus Gessner, Michael Kühn, Peter Jones
Published in: Mineral Deposit Research: Meeting the Global Challenge
Publisher: Springer Berlin Heidelberg
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We present the results of numerical simulation of chemical processes that formed the Mount Isa copper orebodies. Reduction through wall-rock reaction, is the most likely chemical process, although mixing of two fluids of contrasting oxidation state may also have contributed. Most rocks in the Mount Isa region have the ability to reduce oxidized fluids. Porosity (instantaneous fluid to rock ratio) is highlighted as a critical control on ore grade and ratio of Cu to Pb and Zn. Mechanical properties of the host rock may there-fore be more important than chemical ones.