-
- دوشنبه تا شنبه: 10:00 - 16:00 / یکشنبه تعطیل است
On the way bacteria can dissolve and re-concentrate gold – this process removes most of the silver and forms gold nuggets," said Dr. Frank Reith, Australian Research Council Future Fellow in the University of Adelaide's School of Biological Sciences. "We've known that this process takes place, but for the first time we've been able ...
به خواندن ادامه دهید
Methanotrophs have been detected on secondary gold grains from an Australian mine, suggesting an environmental association of methane-oxidising bacteria with gold (Reith et al., 2007a). It is not known if other gold-containing enzymes exist in any other microorganisms (Reith et al., 2007a). 4.4. Ligand utilisation and loss
به خواندن ادامه دهید
Special 'nugget-producing' bacteria may hold the key to more efficient processing of gold ore, mine tailings and recycled electronics, as well as aid in exploration for new deposits, research has ...
به خواندن ادامه دهید
Since the identification and characterization of iron and sulfur oxidizing bacteria in the 1940s, a rapid progress is being made in minerals engineering based on biological activities. Microorganisms can play a beneficial role in all facets of minerals processing, from mining to waste disposal and management. Some of the applications, such as biologically assisted leaching of copper sulfide ...
به خواندن ادامه دهید
The role of microorganisms in industrial gold processing. Gold nugget found in the field. Credit: University of Adelaide. Special 'nugget-producing' bacteria …
به خواندن ادامه دهید
Biooxidation involves the use of iron- and/or sulphur-oxidizing acidophilic chemolithotrophic bacteria such as Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, Sulfobacillus thermosulfidooxidans and Leptospirillum ferrooxidans, to oxidize or break down the sulphide matrix surrounding the gold, resulting in improved accessibility ...
به خواندن ادامه دهید
Gold mines in Australia have added to the evidence for the historical role of bacteria in gold production. For his PhD, Reith studied communities of organisms existing in …
به خواندن ادامه دهید
C. metallidurans—whose name means "metal-enduring"—is a unique species of bacteria that survives in environments with high heavy metal concentrations, which would be toxic to other bacteria. C. metallidurans is often found in industrial waste sites or mining locations, and especially in gold nuggets in Australia. To read more, see ...
به خواندن ادامه دهید
Gold Processing and Extraction and the Role Played by Bacteria. Gold mining can be open-pit or deep shaft mixed with other HM such as copper (Cu), silver (Ag) and lead (Pb). Its location determines the type of mining process to be used in extraction and the amount of wastes that will be generated. In the past, small quantities of waste were ...
به خواندن ادامه دهید
The Newest Gold Mining Tool: Bacteria. By Chris Calam 01.23.2018. Geologists employ a variety of geophysical methods to measure variations in the physical properties of rocks (e.g. density, magnetism, electrical conductivity, natural radioactivity, etc.) that may indicate a gold deposit. Although these geophysical methods can be crucial for ...
به خواندن ادامه دهید
The methods used in this study were exploring the potential of bacteria in sulfur oxidation and describing the variety of bacteria that were isolated from gold mining areas by 16s rRNA identification.
به خواندن ادامه دهید
Harnessing microbes to do mining work is called biomining, or sometimes bioextraction or bioleaching. The strategy has been most extensively studied for copper and gold: Colorado-based mining ...
به خواندن ادامه دهید
Bacteria produce gold by digesting toxic metals. C. metallidurans can produce small gold nuggets. Credit: American Society for Microbiology. High …
به خواندن ادامه دهید
Gold mining process produces wastes that contaminate the environment by As. • Bacterial strains of soils from mining region were resistant to 3000 mg L −1 of As. • Reduced 71.88% of arsenite and 85.72% of arsenate from the culture medium. • Potential application of theses strains in bioremediation processes.
به خواندن ادامه دهید
"When confronted with ever more gold, some bacterial cells are completely encased with gold," study leader Dietrich Nies, a molecular microbiologist at Martin Luther University in Germany, told ...
به خواندن ادامه دهید