It has also been demonstrated that metals like gold continue to accumulate on the negatively charged polymers even after the bacteria have died, so that the process can continue indefinitely giving gold nuggets.
Recently (John Watterson, 1992; Geology 20: 315-318), association of lace like gold decorated microbial structures with gold particles was demonstrated from nine Alaskan sites.
In this study, preliminary evidence was also available for the presence of specific baeteria Podomicrobium like, budding bacteria, which are also involved in iron and manganese oxide deposition processes. Chlorella vulgaris and Bacillus cereus have also becn shown, in the laboratory, to have the ability of nucleating metallic gold from dilute, solutions having, gold as Au (III) or as gold chloride.