Effect of the cyanide-producing bacterium Chromobacterium violaceum on ultraflat Au surfaces

Chromobacterium violaceum and its important metabolites — review

“…Both bacteria exhibited a high growth rate, cyanide production and gold-leaching efficiency at all material densities (Pham and Ting 2009). In a similar experiment, C. violaceum was capable of transforming the roughness of gold surface by solubilizing gold via formation of free cyanide which then interacts with gold (Fairbrother et al 2009). Addition of hydrogen peroxide to these bacterial culture increased the gold dissolution.…”

Fluids in geological processes — The present state and future outlook

“…Among the few conference papers dedicated to experimental aspects of low-temperature surface geochemistry, Fairbrother et al (2009) demonstrated an original use of scanning tunnelling microscopy to understanding mechanisms of Au mobilisation via cyanideproducing bacteria. This work contributes to a body of recent work emphasizing the role of micro-organisms on Au-cycling (e.g.…”

Effect of manganese oxide minerals and complexes on gold mobilization and speciation

“…The mobility of Au in surface environments is verified by a large body of evidence based on determining the products of its (bio)-geochemical redistribution, including: (i) the occurrence of nano-and micro-meter sized particles of pure (secondary) Au associated with oxide-, carbonate-and clay minerals and organics in the weathering environment (Reith et al, 2005;McPhail, 2006, 2007;Schmidt Mumm and Reith, 2007); (ii) the biogeochemical (trans)formation of Au nuggets under surface conditions (Falconer et al, 2006;Fairbrother et al, 2009Fairbrother et al, , 2012Reith et al, 2010;Brugger et al, 2013); and (iii) the occurrence of Au in ground and surface waters as well as plant and animal tissues (Jones, 1970;Reid et al, 2008Reid et al, , 2009Dunn, 2011). As a consequence, Au enrichment zones form in surface environments around subsurface Au-bearing ore-bodies, in some cases leading the formation of secondary deposits (Zang and Fyfe, 1993;Hough et al, 2008;Falconer and Craw, 2009).…”