ユーカリの葉に微量の金、鉱脈探査の指標に 豪研究


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[October 23 AFP] — underground — the research team of Australia announced on the 22nd that the surprising mark for looking for the gold which it has underground deeply was discovered.
It is said that it turned out that a small amount of gold is contained in the leaves of the eucalyptus which has sprung up on the gold ore pulse.
? — discovery of a new gold ore pulse was decreasing by 45% by here ten-year Hazama, the amount of gold holdings of each country continued reduction, and the gold price has risen suddenly.
But, according to the paper published in English Science journal Nature Communications (Nature Communications), this new discovery may become good news for people who look for a gold ore pulse.
in order that the tree of ? eucalyptus may look for water in the dry area — underground — a root is spread deeply.
A root invades also into the stratum which contains gold abundantly, and when it sucks up moisture, it absorbs a detailed metallic particle.
Very a small amount of gold is absorbed by the root of a eucalyptus, and a research team says that it was shown clearly that even a leaf is reached through the inside of wooden.
According to ? economic organization World Gold Council (World Gold Council, WGC), the quantity of the gold extracted from the earth has amounted to 174,000 tons or more since the beginning of civilization.
In the estimation in 2011 of the United States Geological Survey (USGeological Survey, USGS), the deposits of gold in the world are 51,000 tons.
The price of ? money has risen suddenly no less than 482% in March from December, 2000 this year.
Although 60% of gold is used on a jewel, gold is also an important material of an electronic device, and is used also for the medical technology for cancer medical treatment etc.
? research teams are two burying places of gold in the southern part and western part of Australia, and investigated whether gold would be contained in a leaf, a branch and a bark, and the wooden leaf soil and soil of a eucalyptus using the X-ray picture.
As for ? height growing up into 10 meters or more, also underground the tree of a certain eucalyptus has a very deep large root system, and what reached 40 meters below ground is recorded.
Although the concentration of ? money was very as low as 1 of several 100 minutes to 1/thousands of g per ton, the research team showed clearly that the concentration in a leaf is the highest.
It says, “Probably, for a plant, gold is poison and will be moved to an end (leaf etc.) part.”
Although gold of ? very small quantity was sometimes found with the plant until now, it was not clear whether they were absorbed and whether it has been blown away by the wind there.
The authors of the paper are describing that the accuracy of gold ore pulse investigation was raised and the opportunity to development of the new technology which enables supply of continuous gold grew by the newest results of an investigation of ? this time.
(c)AFP




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