WA1 Resources (ASX:WA1) continued to advance the Luni project in Western Australia through structured de-risking programs, with an updated mineral resource estimate completed during the quarter ended June 30, according to a Thursday filing with the Australian bourse.

The revised estimate expanded the indicated component of the Luni deposit to 93 million tonnes at 1.32% niobium pentoxide, the filing said.

Luni's indicated component was 73 million tonnes at 1.38% niobium pentoxide as of June 30, 2025, an earlier filing showed.

The update is being used to advance integrated workstreams, with the pre-feasibility study expected to be completed in the fourth quarter, per the filing.

Shares fell 4% in morning trade Thursday.