Stanley-3 Production Update

4 October 2019

Mosman Oil and Gas Limited

 ("Mosman" or the "Company")

Stanley-3 Production Update

Mosman Oil and Gas Limited (AIM: MSMN) the oil exploration, development and production company, advises that the Stanley-3 continues to produce.

The Stanley-3 well was placed on production on 10 September 2019 ) and produced 2,428 BBLs at an average of 115.6 BOPD gross in September.

The Stanley-3 well production rates are still yet to fully settle. Once steady flow rates have been achieved, the Company will provide and update in relation to this.

Mosman has a 14.85% working interest in the Stanley-3 well.

John W Barr, Chairman, said: "We continue to be delighted with the progress at Stanley, and the clearly commercial flow rates being delivered underline the significant commercial success. Once Stanley-3 is fully settled, the operator's attention will move to Stanley-4.

"The Company continues to meet its objectives, and very much looks forward to the next wells being drilled."

Competent Person's Statement

The information contained in this announcement has been reviewed and approved by Andy Carroll, Technical Director for Mosman, who has over 35 years of relevant experience in the oil industry. Mr. Carroll is a member of the Society of Petroleum Engineers.

Market Abuse Regulation (MAR) Disclosure

Certain information contained in this announcement would have been deemed inside

information for the purposes of Article 7 of Regulation (EU) No 596/2014 until the release of this announcement.

 Enquiries:

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

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