June 2024 Quarter Summary and Corporate Update

Mosman Oil and Gas Limited (AIM: MSMN) the helium, hydrogen and hydrocarbon exploration, development and production company, announces its production update for the three months ended 30 June 2024 and a corporate update.

US Production (Various interests)

Mosman achieved net production in the June quarter of 6,287 boe (circa 69 boepd) versus net production of 3,764 boe (circa 41 boepd) in the March Quarter. The higher production rates were primarily due to successful workovers at Stanley.

June Quarter Production Summary

Net Production of 6,287 boe comprised of 4,628 barrels of oil and 9,624 MMBtu of gas. The average sale prices achieved during the period was US$78.82 per barrel for oil and US$1.03 per MMBtu for gas (March quarter: US$73.73 and US$2.74 respectively, and in each case after transport and processing costs but before royalties).

Mosman achieved net production in the year ending 30 June 2024 of 16,340 boe (c45 boepd) versus net production of 31,067 boe (c85 boepd) in the prior year. The lower production rates were primarily due to natural production decline and various production issues.

Production numbers are based on the current best available data or estimates (including field data if necessary) and are subject to adjustment upon receipt of final sales invoices from the purchasers of products.

Major Project Updates

Cinnabar (75% Working Interest)

The decision was made to recomplete Arco Fee G-3 (formerly known as Cinnabar-1) in a zone that looked promising on wireline logs. The recompleted zone has produced oil with reduced water flow but only flows for a few days before being shut-in to build up pressure. There appears to be a combination of formation damage and/or low reservoir pressure that may be resolved by well stimulation and/or artificial lift.

The other wells continue to produce oil intermittently.

Stanley (34.85% to 38.5% Working Interest)

Stanley-3 was successfully recompleted in March 2024 and produced strong gas flows in April. The gas flow rate subsequently declined and this well is now producing oil with an average gross flow rate in June of 156 bopd. Stanley-2 was recompleted and produces gas. Flow rates are constrained to preserve gas for potential gas lift. Stanley-4 and Stanley-5 were worked over with hot oil to manage paraffin wax build up. Work continues to optimise production at Stanley.

Winters (23% Winters-2 Working Interest)

Winters-2 continues to produce both oil and gas with rates in natural decline.

Arkoma

Given the current low gas prices in USA and limited market for this asset it is not currently being marketed for sale. Given the time delay in receiving accurate production data, it has not been included in this quarterly report. Net production from Arkoma is not expected to be material to Mosman.

Sale of Stanley Area Assets

As previously announced, the Stanley area assets (including Livingston and Winters) are subject to a conditional sale contract. The buyer has requested and Mosman has granted additional time for due diligence (which had originally been set at 30 business days). This has now been extended until the end of August 2024. Completion is still scheduled for 3 September 2024.

Australian Exploration

EP 145

The Operator (Greenvale Energy Ltd) has been advised by the NT government department that they would approve or request modification to the submitted EP145 2D Seismic Environmental Management Plan (EMP) on or before 26 August 2024.

The Company has also been advised that, due to the upcoming Northern Territory elections, the NT Government will go into caretaker mode from 1 August 2024 until the election is completed and the new Government is sworn in by the Administrator. During this period, the Government assumes a "caretaker" role and avoids making major decisions such as approval of Environmental Management Plans. Greenvale Energy has therefore applied to the NT Government to extend the current permit year commitments by six months to February 2025 to allow for the completion of the planned 2D seismic and to keep the permit in good standing.

EPA 155

Mosman notes the recent update from Mining Minerals & Metals plc ("MMM") regarding the proposed acquisition of Georgina Energy plc ("Georgina"). Georgina's subsidiary company Westmarket Oil & Gas Pty Ltd is Mosman's farmin partner in Exploration Permit 155 application.

Mining Minerals & Metals Plc (AIM:MMM) has confirmed that a prospectus has been approved by the UK Financial Conduct Authority ("Prospectus") regarding the reverse takeover by Georgina Energy plc and a capital raise to raise gross proceeds of £5m. The Prospectus has been published and is available to view at www.mmmplc.com/mmmplc-news. The Prospectus includes a Competent Person's Report ("CPR").

Cash position

As at 30 June 2024, Mosman had cash at bank of circa AUD$1.07 million. The cash balance has increased since that date due to the exercise of warrants.

Andy Carroll, CEO, said: "We are pleased to see production increasing this quarter as a result of successful workovers at Stanley. With the oil price around USD 80 per barrel this asset provides strong cash flow.

"The NT election may result in a modest delay in the seismic acquisition in EP 145, but that work should still happen in 2024."

Glossary