From the Herald Sun :
Riding Australia's resources boom like no one else, BRW magazine's annual rich list yesterday revealed the 58-year-old mining magnate's wealth has ballooned by an unparalleled $18.87 billion in the past year to $29.17 billion.
That equates to $598 a second, more than $1 million for every half an hour - and almost $52 million a day.
Ms Rinehart is now the richest woman in the world, surpassing the $25 billion of Christy Walton, the widow of Wal-Mart founder John Walton, who still has a major stake in the US retail giant.
Ms Rinehart's meteoric rise led experts to speculate she is a serious contender to become the world's richest person. She would have to pass the $69 billion fortune of Mexican telco mogul Carlos Slim.