21 September 2021

Mosman Oil and Gas Limited

("Mosman" or the "Company")

COVID UPDATE

Mosman Oil and Gas Limited (AIM: MSMN) the oil exploration, development, and production company, announces operations and exploration activities continue with some minor delays due to the Covid-19 pandemic in both Australia and the USA.

In Australia, the geophysical Survey over permit EP-145 has been successfully acquired and processed following minor time delays resulting from Covid related travel restrictions. This data is currently being interpreted and integrated into the regional basin model with the now expected early in October. Once the report is received, the information will be considered and integrated with the geological model. We note that Central Petroleum has been active drilling wells in the nearby permits with positive results on the Stairway sandstone which is one of the target zones in EP-145, as well as the sub-salt helium potential. Covid related restrictions may impact the timing of the Work Area Clearance Survey by the Central Land Council, a requirement for the planned seismic survey.

In the USA, the site for the Winters 2 well is ready and waiting for the drilling rig. The rig operator has advised that the delay is due to restricted crew availability as a result of Covid issues, and the rig is now scheduled to arrive on site on 27 September 2021.

The combinations of pandemic related staffing issues and higher oil prices have also meant a shortage of workover rigs, however a workover is now re-completing a well on the Duff lease and will then move to the Stanley lease.

The delay to workovers, particularly at Stanley, has meant some reduction of short term production rates which, as noted above, should be resolved with a rig now on contract. Production at Falcon has continued to perform strongly with some natural decline from the rates notified on 29 July 2021.

The effect on revenue is currently being mitigated by the strong oil and gas prices, with the WTI oil price over USD 70/barrel and gas currently over USD 5/mmbtu, higher than prices from last quarter when the acquisition of additional interests was being negotiated.

Covid19 restrictions in NSW also mean the Company's Sydney based accountants and Company Secretary office is currently closed and staff restricted to working from home.

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:

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

www.mosmanoilandgas.com