But two International Atomic Energy Agency reviews found the plant to be low risk and compliant with relevant regulations, Lynas noted.
The decision raises the prospect of an interruption to supply of neodymium and praseodymium (NdPr) which are used in magnets as crucial components of everything from iPhones to weapons systems, later this year.
“After 10 years of safe operation in Malaysia we are disappointed that the conditions that were applied to our 2020 operating licence remain," Chief Executive Amanda Lacaze said in the statement. “We will now proceed with administrative and legal appeals to ensure that Lynas is treated fairly and equitably as a Foreign Direct Investor and a significant employer and contributor to the Malaysian economy." Under its new permit, Lynas will be able to continue other parts of processing until March 2026. Lynas had applied to Malaysia's regulator for the conditions to be removed because they "represent a significant variation from the conditions under which... Lynas made the initial decision to invest in Malaysia," it said.
The decision puts a greater focus on the construction timeline for Lynas' cracking and leaching facility in central Australia, broker Canaccord said in a report, with Lynas able to use stockpiles for a time if the plant is not ready by July 1.
Lynas ships rare earths concentrate to Malaysia from its Mount Weld operations in Central Australia where it is building the processing plant in the town of Kalgoorlie to add capacity and mitigate Malaysia's regulatory risk.
"After the market fully digests this news, we see investor focus return to the significant long-term value LYC offers, its strategic asset base and market leading position (ex China) in the NdPr market," Canaccord said, maintaining its buy rating.
Lynas shares traded up 2.5% at A$8.50 ($5.92) on Tuesday
after falling as much as 8.2% on the previous day after a news
report at the weekend suggested its operating licence would not
be approved.
($1 = 1.4355 Australian dollars)
(Reporting by Melanie Burton in Melbourne, Rozanna Latiff in
Kuala Lumpur and Roushni Nair in Bengaluru; Editing by Shailesh
Kuber, Josie Kao and Muralikumar Anantharaman)