SYDNEY, Australia - Scientists from the Commonwealth Scientific and
Industrial Research Organisation (CSIRO) have found minuscule nuggets of gold
hidden inside the leaves of eucalyptus trees, in a discovery they say could
help prospectors discover new deposits of the precious metal.
According to Australian researchers, deposits of the precious metal found in
the resource-rich Kalgoorlie region of Western Australia, which was the site of
a major gold rush in the late 1800s.
Geochemist Mel Lintern said it appeared the trees sucked up the gold
particles from 30 
metres (100 feet) below the ground through their roots.
metres (100 feet) below the ground through their roots.
He said, the eucalyptus acts as a hydraulic pump — its roots extend tens of
metres into the ground and draw up water containing the gold.
As the gold is likely to be toxic to the plant, it’s moved to the leaves and
branches where it can be released or shed to the ground, he added.
In research published in the journal Nature Communications, the
CSIRO said the leaf 
particles themselves would not trigger a new gold rush as
they measure just a fifth the width of a human hair and are visible only
through advanced X-ray imaging.
particles themselves would not trigger a new gold rush as
they measure just a fifth the width of a human hair and are visible only
through advanced X-ray imaging.
Researchers involved in the study estimated it would take the gold from 500
eucalyptus trees to make a single wedding band.
But they said the discovery presented a gilt-edged opportunity to improve
the exploration methods used to search for gold, making them more efficient and
environmentally friendly.
- “This link between ... vegetation growth and buried gold deposits could prove instrumental in developing new technologies for mineral exploration,” they said.
- New discoveries of gold have fallen by 45 per cent in the past decade, while prices have skyrocketed as reserves steadily dwindle — the cost of the yellow metal shot up by 482 per cent between December 2000 and March this year.
- The CSIRO said scientists could use a technique known as “biogeochemical sampling” to give an indication of the presence of gold.
- Nigel Radford, a geochemist who has been involved in gold exploration for decades in Western Australia, said the discovery was a world-first with major implications for prospectors.
According to the World Gold Council, more than 174,000 tonnes of gold have
been extracted from Earth since the dawn of civilization.
In 2011, the US Geological Survey estimated there were 51,000 tonnes of gold
left in reserve in the world.
Radford said using biogeochemical sampling had the potential to make
searching for gold deposits much easier.
“If you can sample on-surface, it saves all the cost and all the time
involved in drilling holes,” he said.
Sixty per cent of gold becomes jewellery, but it is also a crucial component
in electronics and is used in medical technology, including for cancer
treatment.
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