28 February 2022

Mosman Oil and Gas Limited

("Mosman" or the "Company")

CLC Permit Issued for EP-145 Environmental Survey

Mosman Oil and Gas Limited (AIM: MSMN) the oil exploration, development, and production company, is pleased to announce an update on EP-145 located in the Amadeus Basin, Northern Territory of Australia, which is prospective for oil and gas, hydrogen and helium.

On 25 February, the Central Land Council ("CLC") issued a Permit and Authority to enter and remain on Aboriginal Land and/or Community Living Areas for the area which is covered by EP-145 (the "CLC Permit").

The CLC Permit for four months will allow Mosman to undertake an environmental survey which is required prior to the planned 2-D seismic acquisition programme.

This enables Mosman to proceed with the environmental survey which is scheduled to be completed in March 2022.

John W Barr, Chairman, said: "Mosman is pleased to secure the CLC Permit on EP-145 now enabling the environmental survey to proceed. This survey and a CLC heritage clearance survey are the only on-site survey requirements prior to the seismic acquisition.

"Interpretation of the resulting seismic will be important in assisting Mosman to refine further our technical understanding of the sub surface structures and identify future drilling locations in EP-145 which is prospective for oil and gas, hydrogen and helium."

Market Abuse Regulation (MAR) Disclosure

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under the Market Abuse Regulations (EU) No. 596/2014 ('MAR') which has been incorporated into UK law by the European Union (Withdrawal) Act 2018. Upon the publication of this announcement via Regulatory Information Service ('RIS'), this inside is now considered to be in the public domain.

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