Mosman Oil and Gas Limited

("Mosman" or the "Company")

Amadeus Basin EP-145 Update

Mosman Oil and Gas Limited (AIM: MSMN) the oil exploration, development, and production company, announces the completion of the on-site portion of the Environmental Survey at EP-145, located in the Amadeus Basin in the Northern Territory, Australia.

The Environmental Survey was completed on schedule and initial results have been received. The next step is the receipt of the final report and submission to the NT government.

This Environmental Survey was one of the pre-requisites to seismic acquisition. The other pre-requisite is approval for acquisition from organisations representing native title parties.

Representatives from the Company will be travelling to Alice Springs in April to meet with the Central Land Council ('CLC') and to attend the annual technical conference.

John W Barr, Chairman, said: "Mosman is pleased to achieve the next step in the approval process at EP-145 and is following up on the outstanding final reports with vigor.

"The Amadeus Basin is considered an important asset with considerable exploration upside which needs ongoing work to prove the concepts and resources."

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

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 seven projects in the US: Stanley, Greater Stanley, Livingston, Winters, Challenger and Champion in East Texas and Arkoma in Oklahoma in addition to exploration projects in the Amadeus Basin in Central Australia.

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