Today gold ore is mined from solid rocks but it can also extracted from old river deposits. Gold has been used as a store of money for centuries. It is rare and therefore valuable and it doesn't react with water or with air . The atom number for gold is 79 . There is enough refined gold in the world to fill a small house, however, we can only guess at how much unrefined gold is still under the ground.
Most gold is found in rocks and at the bottom of rivers.
There are 10 milligrams of gold per tonnes of sea water. But so far, nobody has managed to extact gold from sea water profitably. A carat is a measure of the purity of gold. The purest gold is 24 carats, not to be confused with a carrot, which is a vegetable.