The reduction of aqueous Au3+ by sulfide minerals and green rust phases

DM Heasman*, DM Sherman, KV Ragnarsdottir

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

18 Citations (Scopus)

Abstract

The reactions of An(3+) with green rust, stibnite, pyrite, and chalcopyrite were investigated in the laboratory and the size of the gold clusters formed was measured using extended X-ray absorption fine structure (EXAFS) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The individual clusters produced were between approximately 29 Angstrom and 77 Angstrom in diameter and may occur individually or as composite clusters from hundreds to thousands of angstroms in size. This work shows that it is possible to form "invisible" gold through reduction of An(3+) by green rust phases and the surfaces of sulfide minerals.

Original languageEnglish
Pages (from-to)725-739
Number of pages15
JournalAmerican Mineralogist
Volume88
Issue number5-6
Publication statusPublished - 2003

Keywords

  • INVISIBLE GOLD
  • CHLORIDE SOLUTIONS
  • WESTERN-AUSTRALIA
  • LOW-TEMPERATURES
  • NATURAL-WATERS
  • ORE-DEPOSITS
  • MINERALIZATION
  • EXAFS
  • ADSORPTION
  • SPECIATION

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