17 November 2022

Mosman Oil and Gas Limited

("Mosman" or the "Company")

Cinnabar-1 well production update

Mosman Oil and Gas Limited (AIM: MSMN) the oil exploration, development, and production company, provides an update in respect to the Cinnabar-1 well in Tyler County, Texas.

The Cinnabar well was drilled in October 2022 and is now in the process of being completed and placed on production.

All the required production equipment, including tubing, has been procured and is now on site. The preferred service rig has been contracted and will be mobilised to Cinnabar once other work has been completed.

As a result, the revised schedule for the next phase of site operations in now early in December, with initial production flow rates anticipated to be announce in mid-December

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 information is now considered to be in the public domain.

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.