Bacteria can leach small amounts valuable metals from otherwise useless ore, researchers have found.
These mineral-crunching microorganisms are a type of bacteria that use minerals as their source of energy. When the life-forms break down the matter through metabolism, they squeeze out metal ores or concentrates combined with sulfur in a process called bioleaching.
The method is emerging as an increasingly important way to extract valuable minerals when conventional methods such as smelting can't do the job cheaply enough, experts say.
Development is also being spurred by the electronics industry's brisk global demand for copper.
"Certain microbes react to metal ions and help copper be leached out of low-quality ore," said Masaru Tomita of the Institute for Advanced Biosciences at Japan's Keio University.
"The ultimate goal is to establish biotechnologies to leach copper from this low-quality ore."
Bioleaching already currently accounts for an estimated 20 percent of the world's mined copper, and is in use at about 20 mines around the world.
That's further along than I would have thought. Pretty kewl too.