It's true but that's not saying much because in our history, if you took all of the gold that humanity has ever mined and put it all together, you'd have a structure about half the size of the Washington Monument. That's not a lot of gold.Well there are entire asteroids apparently composed of more gold than the Earth has ever produced flying around, but without an apparatus to collect it, it's meaningless.
This is why it's extremely rare to buy gold in its pure form. The Canadian Gold Maple Leaf coin is the purest gold coin in the world at 99.99999% pure gold. To be honest though, pure gold isn't a very useful metal because it's so damn soft.