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Gold precipitation at Winu: textures suggest gold precipitated according to
“bismuth collector” model
Stage 1
Stage 2: bi-Au inclusion trails Bi (Te) melts can form in hydrothermal solutions above
in quartz ~300°C and scavenge gold
native bismuth from gold undersaturated hydrothermal fluids
(Douglas et al. 2000, Tooth et al. 2008)
Stage 3: te-bi –
Au along qtz
hedlyite grain
boundaries & in
joseiteB pilsenite fractures
Stage 4: bism-
Au inclusions in
sulphides
bismuthinite tetradymite
T=450°C
