Mendell Helium PLC (AQSE: MDH) Helium Production commences at Rost

Mendell Helium is pleased to announce that production of helium has commenced at M3 Helium Corporation’s (“M3 Helium”) Rost 1-26 well in Fort Dodge, Kansas (“Rost”).

Highlights

·    Commercial production at Rost has commenced

·    Rost flow rates continue to increase in significant increments each day as de-watering progresses

·    The well is now producing in excess of 100 Mcf per day of total gas

·    Initial gas deliveries to the off-taker will be made by tube trailer

·    Potential secondary revenue stream through sales of NGLs

·    Preparations for the move to AIM are continuing

As announced on 27 June 2024, the Company has an option (the “Option”) to acquire M3 Helium, a producer of helium which is based in Kansas and holds an interest in six producing wells.  There is no certainty that the Company’s option to acquire M3 Helium will be exercised, nor that the enlarged group will successfully complete a re-admission. As announced on 30 September 2025, the Company and M3 Helium have agreed to extend the date on which the Option should be exercised to 30 November 2025.

Production at Rost

Gas from Rost is now being compressed into a tube trailer which has been leased by M3 Helium. The tube trailer’s capacity is around 160 Mcf meaning, with a 5.1% helium concentration, each cargo of raw gas from the well has a value of around $2,400 to M3 Helium. 

Flow rate from the well continues to increase in line with de-watering and in accordance with M3 Helium’s expectations.  On 6 November 2025, the flow rate was measured at 107.7 Mcf/day, which is more than double the previous recorded rate two weeks ago, and equivalent to over $1,600 of helium per day.

The increase in flow rate is particularly remarkable for two reasons. Firstly, resistance to flow was recorded at 393 psi (being water head pressure on the formation). Secondly, the well was shut in for a few days to allow for maintenance on the submersible pump’s motor.

The current flow rate from Rost already exceeds the capacity of the Bauer compressor pump which is connected to the tube trailer and M3 Helium is therefore limiting the pump speed until the on-site pressure swing adsorption (“PSA”) unit and gas-separation membranes are fully commissioned.  This will remove much of the nitrogen from the gas mix thereby enabling both a faster fill of helium into the tube trailer and a more concentrated mix (the estimated target is 75% helium by composition following treatment by the PSA and membranes).

Once a concentrated helium gas mix is delivered to the tube trailer, each cargo is estimated to have a value of around $36,000 to M3 Helium. 

Alongside gas production, Rost is also producing natural gas liquids (“NGLs”), a low-density mixture of hydrocarbon liquids.  The M3 Helium team are putting in place a NGL recovery method to separate these from the gas mix to avoid compromising the compressor.  At the current production volume and composition, M3 Helium estimates that it will collect around two barrels of NGLs per day which will provide a secondary revenue stream for Rost.

Admission to AIM

Progress continues to be made on the preparations for Mendell Helium’s proposed Admission to AIM.  Final drafts of all key reports, including the competent person’s report, M3 Helium 2024 audit and US legal due diligence, have been received by the Company, and the focus is now on concluding the drafting and verification of the admission document. 

Further announcements will be made in due course.

Nick Tulloch, Chief Executive Officer of Mendell Helium and Chairman of M3 Helium, said: “M3 Helium’s Rost well continues to perform in line with expectations and we have now reached the culmination of the work and planning that has gone into the project with commercial production now underway.  Rost is currently generating over US$1,600 of helium per day. This milestone achievement is nevertheless just the beginning as we expect the revenue capabilities of the well to increase in line with rising production and, importantly, on-site purification once the PSA is fully commissioned.

“The validation of the operations now opens the way for further expansion in the Fort Dodge area.  M3 Helium has already leased additional land and will now assess suitable locations for further wells.”

This announcement contains inside information for the purposes of the UK Market Abuse Regulation and the Directors of the Company are responsible for the release of this announcement.

ENDS

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