(Changes dateline, adds Hancock response in paragraph 4, and
details in paragraph 5)
MELBOURNE, April 10 (Reuters) - U.S. rare-earths
producer MP Materials MP.N said Australian billionaire Gina
Rinehart's mining firm had taken a 5.3% stake in the company,
expanding her investments in the mineral ore sector.
In a regulatory filing last week, the Nevada-based miner
said Hancock Prospecting, owned by Australia's richest person
Rinehart, holds about 8.8 million shares of MP Materials.
MP Materials is the second-biggest producer of rare earths
outside China after Australia's Lynas Rare Earths LYC.AX .
Lynas ended talks with MP Materials over a potential merger in
February.
Hancock declined to comment on Wednesday.
The iron ore miner has been building stakes in critical
minerals projects, including rare earths. Hancock's investments
include a 6.17% stake in Brazilian Rare Earths BRE.AX and a
9.14% holdings in Arafura Rare Earths ARU.AX , according to
LSEG data.
(Reporting by Melanie Burton in Melbourne and Roshia Sabu in
Bengaluru; Editing by Maju Samuel and Sherry Jacob-Phillips)
((Roshia.Sabu@thomsonreuters.com;))