Insights into the liquid bismuth collector model through analysis of the Bi-Au Stormont Skarn Prospect, Northwest Tasmania

Amy Beth Donovan Cockerton, Andrew George Tomkins

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    The liquid bismuth collector model has previously been proposed to explain the common association between gold and bismuth seen in many ore deposits, and involves the scavenging of gold from hydrothermal fluid by liquid bismuth. Here, textural relationships and temperature and chemical conditions of mineralization at the Stormont Bi-Au skarn prospect in northwestern Tasmania are analyzed to investigate whether the liquid bismuth collector model can explain gold accumulation at this prospect. The calc-silicate skarn assemblage containing grandite, hedenbergite, actinolite magnetite, epidote, quartz, and calcite suggests that initial metasomatism involved temperatures >400 degrees to 500 degrees C. Visible gold is associated with native bismuth, bismuthinite, maldonite, galena, and an unknown Bi-Te-S mineral. Native bismuth is directly associated with grandite, which formed during initial stages of metasomatism.
    Original languageEnglish
    Pages (from-to)667 - 682
    Number of pages16
    JournalEconomic Geology
    Issue number4
    Publication statusPublished - 2012

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