Mosman Oil and Gas Limited

("Mosman" or the "Company")

Amadeus Basin Permit EP 145

Mosman Oil and Gas Limited (AIM: MSMN) the oil exploration, development, and production company, advises that the airborne gravity and gradiometry survey over EP 145, in the Amadeus Basin in the Northern Territory of Australia has now been approved by the relevant Government Department.

The contractor for the data acquisition has advised that there is one job currently being completed and that work at EP 145 should commence in the week commencing 5 July 2021.

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.

Enquiries:

Mosman Oil & Gas Limited John W Barr, Executive Chairman Andy Carroll, Technical Director

jwbarr@mosmanoilandgas.com acarroll@mosmanoilandgas.com

NOMAD and Broker

SP Angel Corporate Finance LLP

Stuart Gledhill / Richard Hail / Adam Cowl

+44 (0) 20 3470 0470

Alma PR

Justine James / Joe Pederzolli

+44 (0) 20 3405 0205

+44 (0) 7525 324431

mosman@almapr.co.uk

Joint Broker

Monecor (London) Ltd trading as ETX Capital Thomas Smith

020 7392 1432

Updates on the Company's activities are regularly posted on its website:

www.mosmanoilandgas.com

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