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dc.contributor.authorPhillips, G.
dc.contributor.authorEvans, Katy
dc.date.accessioned2017-01-30T11:20:56Z
dc.date.available2017-01-30T11:20:56Z
dc.date.created2010-04-08T20:02:28Z
dc.date.issued2004
dc.identifier.citationPhillips, G. and Evans, K. 2004. Role of CO2 in the formation of gold deposits. Nature. 429 (6994): pp. 860-863.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/10777
dc.identifier.doi10.1038/nature02644
dc.description.abstract

Much of global gold production has come from deposits with uneconomic concentrations of base metals, such as copper, lead and zinc. These 'gold-only' deposits are thought to have formed from hot, aqueous fluids rich in carbon dioxide, 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 strong, 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 variable. 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.

dc.publisherNature Publishing Group
dc.titleRole of CO2 in the formation of gold deposits
dc.typeJournal Article
dcterms.source.volume429
dcterms.source.startPage860
dcterms.source.endPage863
dcterms.source.issn00280836
dcterms.source.titleNature
curtin.accessStatusFulltext not available
curtin.facultyDepartment of Applied Geology
curtin.facultyFaculty of Science and Engineering
curtin.facultyWA School of Mines


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