Notice of GM

Mendell Helium announces that a circular and notice of general meeting ("General Meeting") have been posted to shareholders to seek shareholder approval to enable the 4p Warrants, the 6p Warrants and the Adviser Warrants, to be exercisable in due course for new ordinary shares in the Company, pursuant to the announcement of the Subscription on 23 June 2025.

The gross proceeds of the Subscription of approximately £515,000 will provide the Company with additional working capital as it finalises its near-term objectives, primarily:

• Commencing production at the Rost well following receipt of the water disposal permit during July 2025
• Establishing a Bitcoin treasury management policy to support its forthcoing helium production activities

The General Meeting will be held at 11.00 am on Monday 14 July 2025, at the Company's offices at Office 12, Arran House, Arran Road, Perth, Perthshire PH1 3DZ.

Capitalised terms used in this announcement shall, unless otherwise defined, have the same meaning as set out in the announcement on 23 June 2025.

The Directors of the Company are responsible for the release of this announcement.

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 tested at over 4,500 barrels of water per day at 640 psi.