Role of CO2 in the formation of gold deposits

G. N. Phillips () and K. A. Evans
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G. N. Phillips: CSIRO Division of Exploration and Mining
K. A. Evans: Monash University

Nature, 2004, vol. 429, issue 6994, 860-863

Abstract: Abstract Much of global gold production has come from deposits with uneconomic concentrations of base metals, such as copper, lead and zinc1. These ‘gold-only’ deposits are thought to have formed from hot, aqueous fluids rich in carbon dioxide2, but only minor significance has been attached to the role of the CO2 in the process of gold transport. This is because chemical bonding between gold ions and CO2 species is not strong3, and so it is unlikely that CO2 has a direct role in gold transport. An alternative indirect role for CO2 as a weak acid that buffers pH has also appeared unlikely, because previously inferred pH values for such gold-bearing fluids are variable2,4,5,6. Here we show that such calculated pH values are unlikely to record conditions of gold transport, and propose that CO2 may play a critical role during gold transport by buffering the fluid in a pH range where elevated gold concentration can be maintained by complexation with reduced sulphur. Our conclusions, which are supported by geochemical modelling, may provide a platform for new gold exploration methods.

Date: 2004
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DOI: 10.1038/nature02644

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