15 January 2024

Mosman Oil and Gas Limited

("Mosman" or the "Company")

EP 145 Progress Report

Mosman Oil and Gas Limited (AIM: MSMN) the hydrocarbon, helium and hydrogen exploration, development, and production company, provides an update on its EP 145 project in Australia.

Mosman has lodged the Environmental Management Plan ("EMP") with the Northern Territory Government. Approval of the EMP and re-issue of the Aboriginal Areas Protection Authority ('AAPA') Certificate are the two remaining approvals required prior to the acquisition of 2D seismic, scheduled for 2024.

Completion of the Farmin Agreement announced in October 2023 is subject to government approval of the proposed change of Operator and transfer of interest. The farminee, Greenvale Pty Lim (ASX:GRV), has advised that they have received the Stamp Duty assessment and paid the amount due. The next step is Ministerial approval, which is expected to proceed now that stamp duty has been paid. The Company is not in control of the timing of Ministerial approval, but based on progress so far anticipates Completion to occur in the near future.

Andy Carroll, CEO of Mosman commented: "I am pleased these two milestones in the exploration and Farmin Agreement process have been reached. This keeps us on track to acquire seismic in 2024 and then drill in 2025 to test the helium, hydrogen and hydrocarbon potential in this area."

Enquiries:

Updates on the Company's activities are regularly posted on its website: www.mosmanoilandgas.com

Notes to editors

Mosman (AIM: MSMN) is an oil exploration, development, and production company with projects in the US and Australia. Mosman's strategic objectives remain consistent: to identify opportunities which will provide operating cash flow and have development upside, in conjunction with progressing exploration of existing exploration permits. The Company has several projects in the US, in addition to exploration projects in the Amadeus Basin in Central Australia.