Super Bacteria Create Gold

Posted by Soulskill on Tuesday October 2, 2012 @10:52AM from the thar-be-gold-in-them-bacteriums dept.

SchrodingerZ writes "With the price of gold skyrocketing in today's market, Michigan State University researchers have discovered a bacterium that can withstand high toxicity levels that are necessary to create natural gold. '"Microbial alchemy is what we're doing — transforming gold from something that has no value into a solid, precious metal that's valuable," said Kazem Kashefi, assistant professor of microbiology and molecular genetics.' The bacteria is Cupriavidus metallidurans, which is conditioned to be tolerant to heavy, toxic metals and to be 25 times stronger than most bacteria. When put into gold-chloride (a natural forming toxic liquid), the bacteria reproduces and converts the liquid into a gold nugget. The complete process takes about a week to perform. This experiment is currently on tour as an art exhibit called 'The Great Work of the Metal Lover.'"

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Re:Gold-chloride found in nature? by Grayhand · 2012-10-02 13:02 · Score: 5, Interesting

gold-chloride (a natural forming toxic liquid),
Where is gold-chloride found in nature? A quick google search and all I could find were descriptions describing gold-chloride as something created in a lab.
I think this was done as a what if experiment and has no practical use. The point though is if you can create a bacteria that will concentrate gold in either industrial or natural compounds if could be very useful. Right now mercury is the main element used in processing gold ore. Japan started extracting gold from sewage. I thought it was a silly idea until I heard how much they extracted. I'm not sure what the source of the gold is, old fillings wearing or naturally occurring but they did get a respectable amount from the sewage. Most of the world's available gold is actually suspended in seawater. The downside is it costs more to extract it than the gold is worth. Say you develop a bacteria that seeks out and absorbs gold then sinks to the bottom of the tank. You could over time end up with a coating of gold on the tank bottom. A similar process has been developed for removing radioactive elements from drinking water.