According to a study of the University of Bristol (UK) and Munster (Germany), published in Nature, gold and platinum would be rained down from the sky 4 billion years ago, thanks to a bombardment of meteorites lasted 200 million years. "If we were able - the researchers write Matthias Willbold and Thorsten Kleine - to drop to 3 thousand kilometers deep, reaching the center of the Earth and recover all the gold and platinum which are deposited, we could cover the surface of the planet with a thick layer four meters. "
To measure the purity of gold using the carat: the 24 carat gold (usually in bars) is pure, that does not contain other metals. Slightly less pure gold is 22 carats of which are made some coins: it has 91.7% gold. That 18-carat, used in jewelry, is 75% pure and contains other metals, including silver, copper and sometimes zinc, palladium and nickel. The latter, the use of which is regulated by law as it is a potent allergen, is used to produce the so-called white gold. And down up to 8 carat gold, which indicates the proportion of gold to their lowest possible in the world: 37.5% gold, 42.5% silver and 20% copper
The US Federal Bank, the Fed, holds the largest official reserves of gold in the world (8133.5 tons). Followed by Germany (3387.1 tons), the International Monetary Fund (the IMF, with 2851.8 tons), Italy (2451.8 tons) and France (2435.4 tons). China is on the seventh place on the list despite being the first country producer and importer of gold in the world.
Until 1931 most European countries India, Russia, the US and Japan used the gold standard (gold standard) which established an economic order based on the conversion at any time of banknotes in gold according to a fixed exchange ratio.
Gold reached its highest quotation in 1980: about $ 850 an ounce, which some experts would correspond to $ 9,000 today. Considering that one troy ounce equals 31 grams, if their calculations were accurate, an ounce of gold in 1980 would come to cost 290 Euros (current).
"The gold industry," writes economist Loretta Napoleoni in the book Economics rogue, "is not regulated and is made up of a myriad of commercial companies all over the world. The refining of gold is the preserve of a small group of companies that do not control the source of the yellow metal that purchase. And, as the diamond market, even the bloody gold does not appear on the agenda of any government or international governmental organization. "
The 49% of the gold extracted from the mines is used in jewelry. And about 20% of the gold in the world, used for decorative purposes, is located in a sari, the traditional Indian women's clothing.
For over 70 years the standard treatment for rheumatoid arthritis consisted of injections of a liquid suspension of gold, which acted as an anti-inflammatory
In un iPhone 5 ci sono circa 0,03 grammi d'oro (fonte: 911metallurgist.com). Tutti i nostri dispositivi hi-tech contengono una piccola quantità del prezioso metallo e su YouTube ci sono centinaia di video di nuovi cercatori d'oro che spiegano come estrarlo. Secondo GoldKingsOnline, i riciclatori potrebbero recuperare piccole quantità d'oro anche dai vecchi rilevatori di fumo, dai videoregistratori, dai vecchi occhiali da lettura, dal rivestimento di libri antichi, dal toner di alcune stampanti fotografiche...
40% of all the gold mined in the world comes from the basin of the Witwatersrand ("crest white water"), in South Africa. The largest reserves of gold in the world, however, are the oceans: they contain 20 million tons. But you do not know how to extract it so cheap ..
The largest gold mine in the world by size and annual production is Grasberg Mine, in the island of Papua, Indonesia, at 4,000 meters above sea level. In 2011 he produced about 45 tons of pure gold. The Indonesian government owns 9.36%.
The mine most famous is that of San Jose, near Copiapo, Chile, where in August 2010, 33 miners were trapped for 69 days at a depth of 688 meters. The last miner was brought to safety at 21:55 on 13 October of the same year.
Pure gold melts at 1063 ° C and boils at about 2800 ° C. It is extremely malleable and ductile: ounce (approximately 28 grams) can be determined 80 kilometers of wire five micrometers (one-tenth the diameter of a human hair).
The largest gold coin measures 80 cm in diameter and was created by the Perth Mint in 2012: worth 870 000 euro. The acknowledge the size and because it has the image of a kangaroo.
The football team of the San Francisco 49ers named by the wave of prospectors who invaded California (and San Francisco) in 1849. This explains why the gold helmets.
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