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Gold

— Science

"Gold leaf" trees discovered in the Australian outback

Scientists from Australia's Commonwealth Scientific and Industrial Research Organisation have discovered that eucalyptus trees in the Australian outback are drawing up gold particles from deep underground through their root system and depositing the precious metal in their leaves and branches. Rather than being a new source of "gold leaf," the discovery could provide a cheaper, more environmentally friendly way to uncover valuable gold ore deposits. Read More

Bacteria combined with gold to produce "living material"

Scientists at MIT are developing hybrid materials that are a cross between living bacterial cells and non-living components such as gold nanoparticles or quantum dots. The resulting "living materials" are able to respond to their environment like regular living cells, while also doing things like conducting electricity or emitting light. Read More
— Science

Eureka! X-rays detect gold faster and more accurately

Every year, Australian mining companies discard hundred of millions of dollars worth of gold. They're not doing it on purpose, it’s just that the standard industry technique of scanning mineral samples isn’t sensitive enough to detect small traces of the precious metal. Australia’s Commonwealth Scientific and Industrial Research Organisation (CSIRO) and Canadian company Mevex have tested a new technique using powerful X-rays that can detect these small trace amounts quickly and accurately. Read More
— Environment

Non-toxic corn starch could replace cyanide in gold mines

In the gold-mining process, the precious metal is often extracted from low-grade ore in a technique known as gold cyanidation. As its name suggests, the process utilizes highly-poisonous cyanide, some of which ends up entering the environment in the mines’ tailings. That’s not so good. Scientists at Illinois’ Northwestern University, however, recently announced their discovery of a new gold recovery process that’s based on a non-toxic component of corn starch. Read More
— Health & Wellbeing

Gold nanoparticle could allow powerful alpha particles to join cancer fight

Gold nanoparticles have already shown promise in precisely highlighting brain tumors, “blowing up” individual diseased cells, and developing a lung cancer breath test. Now researchers have created gold nanoparticles that allow an alpha particle-emitting element to be directed to small cancer tumors. The researchers say the gold coating keeps the powerful radioactive particles in place at the cancer site so they do negligible damage to healthy organs and tissue. Read More
— Science

Art and science combine to turn gold chloride into nuggets

For centuries, the world's great thinkers were consumed by the search for the mythical Philosopher's Stone. Franciscan friar Roger Bacon is said to have penned a formula for its creation in the 13th century, legend would have us believe that German friar Albertus Magnus actually found a substance capable of transmuting base metals into gold or silver, and English scientist and mathematician Isaac Newton was a known devotee of the magnum opus. Researchers at Michigan State University (MSU) have put a microbial spin on the ancient quest by creating a bioreactor that forces bacteria to transform a toxic liquid that, as team member Kazem Kashefi says, "has no value into a solid, precious metal that’s valuable." Read More
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