Mineral Resources (ASX:MIN) lowered its volume guidance for the Onslow Iron project in Western Australia between 7.8 million tonnes to 8.0 million tonnes from its previous guidance of 8.5 million tonnes to 8.7 million tonnes, according to a Wednesday filing with the Australian bourse.

The revision was due to lower haulage capacity and fewer daily haulage cycles than initially expected, the filing said.

Onslow Iron remains on track to reach its 35 million tonnes per annum capacity by the first quarter of fiscal year 2026.

The company also expects total May shipments at the project of around 1.9 million tonnes, up from 1.3 million tonnes in April, and projects June shipments between 2.3 million tonnes and 2.6 million tonnes.