Mining magnate Gina Rinehart has tumbled 10 places on a list of the world's wealthiest people, despite getting richer.

Ms Rinehart's current wealth is estimated to have increased in the last year by $US700 million to $US17.7 billion ($A19.89 billion), but she fell from a ranking of 36 to 46 in the latest Forbes Magazine rich list.

Gina Rinehart is now the world's fifth richest woman. Credit:Bloomberg

Her wealth has declined from two years ago, as the price of iron ore fell, and she focussed on securing $7 billion in debt for her massive Roy Hill iron ore project.