Australian billionaire Gina Rinehart is making significant strides in the rare earths sector, amassing an $800 million portfolio through Hancock Prospecting. Her strategic investments include an 8.2% stake in Lynas Rare Earths, an 8.5% stake in MP Materials, and a 10% share in Arafura Rare Earths, positioning her as a key player in the global critical minerals market.