Quantum Helium LimitedLSE: QHE

Advisor Update

17 March 2023

Mosman Oil and Gas Limited

("Mosman" or the "Company")

Advisor Update

Mosman Oil and Gas Limited (AIM: MSMN) the oil exploration, development, and production company, advises that the broking arrangement between the Company and Monecor (London) Ltd trading as OvalX has ceased with immediate effect. SP Angel will continue to act as the Company's NOMAD and as sole broker.

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

+44 (0) 20 3405 0205

+44 (0) 7525 324431

mosman@almapr.co.uk

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.