Ginia Rinehart and Hope Welker

Age: 35, 36

Net worth: $1.2 billion each

Citizenship: Australia

Source of wealth: Mining

Ginia and Hope are the daughters of Australian mining mogul Gina Rinehart, Australia’s richest person. Together with their other two siblings, they are the beneficiaries of a trust that owns a large stake in mining giant Hancock Prospecting. Hope joined then withdrew from a four-year court battle to remove her mother as trustee. Ginia stayed out of the long-running