This is from the History Channel Documentary:-
Ancient Aliens - Aliens and Temples of Gold
The ancient Sumerian culture believed that Humans were genetically designed (by ET) to mine for Gold. It is suggested that Gold could be very important to ET having many important uses. Some people believe this is the reason we're here (or the original reason); we've been designed to get the gold out of the planet.
Imagine if they are right and that is really the meaning of our existence and the reason behind our desire and love for gold