Lynas Rare Earths (ASX:LYC) said its first production of dysprosium is expected in May, followed by terbium in June, according to a Monday Australian bourse filing.

The firm started the commissioning of a new heavy rare earth separation circuit in Malaysia, and it has engaged with target customers as a commercial producer of separated heavy rare earth products outside China.

The circuit will also produce unseparated samarium/europium/gadolinium as well as holmium concentrate.

The sales revenue for the fiscal third quarter was AU$123 million, up from AU$101.2 million a year earlier, while sales receipts rose to AU$124.6 million from AU$107.7 million. Quarterly total rare earth oxide production was 1,911 tonnes versus 3,545 tonnes a year earlier, and neodymium-praseodymium production fell to 1,509 tonnes from 1,724 tonnes.

The company expects market volatility to continue through the June quarter as a result of the new global tariff environment and export controls implemented by China.

Lynas Rare Earths' shares were up past 1% in recent trading on Monday.