Bacteria point the way to gold deposits

SALT LAKE CITY May 21, 2002 -- Can bacteria help find gold? A pilot survey of 11 soil profiles across gold mining regions in the Peoples Republic of China indicates that elevated spore counts of Bacillus cereus, a common soil bacterium, were detected in areas adjacent to underlying gold deposits.

Experimental results showed that relatively high numbers of B. cereus spores were associated with gold-containing soils, which suggested the possibility of B. cereus serving as a biogeochemical indicator of underlying gold deposits. This bioindex system may help geologists to locate the gold deposits at low cost and with improved efficiency, says Dr. Hongmei Wang of Ohio State University, one of the researchers on the study, which was presented at the 102nd General Meeting of the American Society for Microbiology.

With the support of the Ministry of Land and Resource and Ministry of Education of China, Dr. Wang and her collaborators had been working on microbial exploration in northwest Sichuan province, which is very famous for its abundance of gold resources. The four-year project was for her Ph.D. thesis research.

Usually gold in soluble form is toxic to microbes as well as to higher organisms. However, bacterial spores can resist harsh environmental conditions (e.g., heat, toxic chemicals, UV radiation, and desiccation) better than bacteria in normal growing stage. In auriferous (gold-containing) soils, microorganisms that can form spores will stand a better chance to survive. In this study, high numbers of B. cereus spores were found in areas of gold-containing orebodies, and they were two or three orders of magnitude higher than those in the background areas. Based on high spore numbers and their distribution patterns, mineralized areas of gold-containing deposits can be determined and the corresponding orebodies can be located if the B. cereus-based assay is combined with other exploration methods.

Experiments on the interaction between B. cereu

Contact: Jim Sliwa
American Society for Microbiology

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