Seventy five% of all gold ever created has been extracted since 1910; most of the gold mined during history is still in circulation in one form or another.
A total of eighty-eight thousand tons of gold have been taken out from earth ever since. This implies all the gold that has been dug up up to now in history would, if melted, make a cube measuring roughly 25x25x25 meters.
Gold is one of the most heavy metals in the world. For instance, it is 19,3 times as heavy as water. One cubic meter weights some 19.300 kilogram.
Gold is very rare than diamonds.
Out of one ounce of gold (app. 31 gram) one can make a wire almost 100 kilometer long.
The largest gold nugget that has ever been discovered weighed around 90 kilogram and was unearthed in Australia.
The world's seas hold a huge amount of gold, however in very low concentrations (perhaps 1-2 parts per 10 billion, meaning every cubic kilometer of water includes 10 to 20 kg of gold).
The term Gold comes from the Old English term Gelo which means yellow.
Switzerland was the last country to tie its currency to gold; it backed 40% of its value until the Swiss joined the International Monetary Fund in 1999.
In 2008 China overtook South Africa as the world's largest gold producer, the first time since 1905 that South Africa has not been the largest.
Absolutely pure gold is so soft that it can be moulded with the hands.
Although the price of some platinum group metals can be much higher, gold has long been considered the most desirable of precious metals and its value has been used as the standard for many currencies in history.
According to some, thereís enough gold in the Earthís crust to cover the entire land surface knee-deep.
Gold is regarded as a noble metal. It is chemically inactive. It is because it is extremely resistant to respond with other elements. The oxidation state of gold ranges from -1 to +5. the +1 and +3 [au(i) and au(iii) are the most typical oxidation states of gold. Gold tends to create an amalgamation with mercury rather than reacting to produce new compounds.It is resistant to the effect of many acids and therefore does not corrode effortlessly. Gold can however be impacted by 3:1 mixture of nitric acid and hydrochloric acid, known as aqua regia. So, generally speaking gold is not a very reactive compound. Besides acids, gold does not mix with halogens, oxygen and so on. Easily. Auric (trivalent) and aurous (univalent) are two kinds of compounds created by gold.