Directorate Change

Mendell Helium is pleased to announce that John Brown has been appointed as a Non-executive Director of the Company, with effect from 1 August 2025.

John has more than 25 years of international experience in oil and gas and related industries, including eight years' experience with operations in North America. He is a Chartered Accountant (ICAS) and was Chief Financial Officer or Group Finance Director for numerous UK listed companies within the oil and gas sector including Gulf Marine Services plc, Bowleven plc and Pittencrieff Resources plc. He was also previously an independent non-executive director at the AIM-listed oil company San Leon Energy plc. He has extensive financial, commercial and strategic expertise and has had wide exposure to both listed capital markets and debt finance providers.

Eric Boyle, Chairman of Mendell Helium, said: "I am delighted to welcome John to the board. His background in finance and oil and gas speaks for itself and his experience with North American operations will be particularly valuable as we accelerate our expansion plans. With M3 Helium's Rost well being prepared for production and work to move to AIM well advanced, we are expecting a very busy period over the coming months and we look forward to updating shareholders as these projects develop."

The following information is disclosed in respect of John Davies Brown (age 61) pursuant to Rule 4.9 of the AQSE Growth Market Access Rulebook. All information is as at the date of this announcement.

John Brown does not hold any ordinary shares in the Company.

There is no further information which is required to be disclosed pursuant to Rule 4.9 of the AQSE Growth Market Access Rulebook in respect of John Brown.

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 ten 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 23 June 2025, the Company and M3 Helium have agreed to extend the date on which the Option can be exercised to 30 September 2025.

The directors are responsible for the release of this announcement.

Overview of M3 Helium

Mendell Helium announced on 27 June 2024 that it has entered into an option agreement to acquire the entire issued share capital of M3 Helium through the issue of 57,611,552 new ordinary shares in Mendell Helium to M3 Helium's shareholders. The exercise of the option will constitute a reverse takeover pursuant to AQSE Rule 3.6 of the Access Rule Book and is subject to, inter alia, publication of an admission document.

The ninth well, Rost, is in Fort Dodge, just to the east of Dodge City, Kansas. It was tested in July 2024 as containing 5.1% helium composition and a previous drill stem test yielded a maximum flow rate of approximately 2,900 Mcf per day. M3 Helium owns a mobile Pressure Swing Adsorption production plant which has been installed on site and will be used to purify the produced helium. The plant is capable of processing up to 800 Mcf per day of raw gas and purifying it up to 99.999% helium.

The tenth well, Brobee, is a disposal well that has been authorised at 5,000 barrels of water per day at 1,200 psi.