Encyclopedia of Geobiology

2011 Edition
| Editors: Joachim Reitner, Volker Thiel

Gold

  • Veit-Enno Hoffmann
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-9212-1_106

Synonyms

Aurum (Latin)

Definition

Precipitation/Bioaccumulation of gold is the precipitation of fine-grained gold colloids by microbial activities.

Nugget. A natural gold grain (>5 mm, >200 mg).

The impact of the use of microbial activity for the solution and precipitation of gold was undervalued for a long period, thus affording the opportunity for economic and environmentally friendly gold bio-processing. Furthermore, the current high price of gold has led to intensive research into the precipitation of gold.

Some iron and sulfur oxidizers (e.g., Acidothiobacillus ferrooxidans, Acidithiobacillus thiooxidans) contribute to the disintegration of important gold ores (Nordstrom and Southam, 1997). In an environment of gold-bearing rocks, the dissolved gold content is 40 times higher than in comparable non-gold-bearing areas (Benedetti and Boulègue, 1991). It has been shown that the dissolution of gold is dominated by the gold thiosulfate complex \({{\rm Au(S}_{\rm 2} {\rm O}_{\rm 3} {\rm...

Keywords

Fusarium Oxysporum Natural Gold Gold Crystal Acidithiobacillus Thiooxidans Bioaccumulation Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Veit-Enno Hoffmann
    • 1
  1. 1.Department of Sedimentology and Environmental GeologyUniversity of GöttingenGöttingenGermany