4. Andrew Forrest

•  Net Worth: $5.7 B                                                                      
•  Source of Wealth: mining
•  Citizen: Australia
•  Age: 51

Born in Perth, Andrew Forrest is a mining billionaire from Australia and fourth wealthiest person in his homeland. He derives his wealth from Fortescue Metals Group in which he holds major stocks. This makes him one of the richest people in Australia. Starting his career as a stockbroker, he has  donated millions for fighting poverty among the poor aborigines.