08:35 AM EDT, 04/28/2025 (MT Newswires) -- Pulsar Helium ( PSRHF ) (AIM and PLSR.V) was last seen down 5.5% in UK trading on Monday after it discovered drilling fines (rock dust) created by the air drilling method, during flow testing activities, present within fractures and partially coating the wellbore wall, at its flagship Topaz project in Lake County, Minnesota.

"Although gas flow may be restricted, pressure communication still occurs which is why the company was unaware of the restricted flow until testing commenced," Pulsar said.

The company performed a preliminary clean-up on both Jetstream #1 and Jetstream #2 wells to mobilize the drilling fines, which achieved improved flow results, showing that these drilling fines are mobile and can be removed. It added that further flow testing of the Jetstream wells will restart when clean-up of the wells is complete, all of which are expected to be completed in the next six to 10 weeks.

UK-listed shares of the company were last seen down 1.50p to 26p.