REG - Mosman Oil & Gas Ltd - Approval Secured for Sagebrush 3D Seismic Survey

Mosman Oil and GasAnnouncement

11/08/2025 07:10

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RNS Number : 7663U  Mosman Oil and Gas Limited  11 August 2025

11 August 2025

 

Mosman Oil and Gas Limited

("Mosman" or the "Company")

 

 

Approval Secured for Sagebrush 3D Seismic Survey

Mosman Oil and Gas Limited (AIM: MSMN), advancing helium, hydrogen and
hydrocarbon projects in the USA, is pleased to announce that the Ute Mountain
Ute Tribe has formally approved the 3D seismic acquisition programme at the
Company's flagship Sagebrush Project in Colorado, USA, where Mosman holds an
82.5% working interest.

This approval marks a major milestone in the advancement of Sagebrush,
enabling Mosman to move ahead with preparations for the seismic acquisition
scheduled to commence in late September and run through mid-October 2025. The
3D seismic survey is a key component in refining drill targets and advancing
towards an extended production test at the previously drilled Sagebrush-1
well, which recorded historic helium concentrations of 2.76% from the
Leadville Formation.

Meanwhile, Sproule, a globally recognised independent energy consulting firm,
is well advanced in its independent verification of the helium resources at
Sagebrush. The work includes a comprehensive review of geological and
engineering data, with results expected towards the end of August 2025. These
findings will further support the Company's commercialisation strategy for the
project.

Mosman also anticipates news on the approval for the Coyote Wash Project in
the coming weeks. The final Environmental Assessment for Coyote Wash was
completed on 17 July 2025 and is currently in the final stages of the
permitting process.

Mosman Interim-CEO Howard McLaughlin commented: "We are delighted to have
received the Ute Mountain Ute Tribe's approval for the Sagebrush 3D seismic
survey, which is a vital step forward in unlocking the project's substantial
helium potential. With seismic now set to proceed and the Coyote Wash approval
also expected soon, Mosman is entering an exciting period of operational
momentum across both key projects."

 

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:

 Mosman Oil & Gas Limited      NOMAD and Joint Broker

 Carl Dumbrell                 SP Angel Corporate Finance LLP

 Chairman                      Stuart Gledhill / Richard Hail / Adam Cowl

                               +44 (0) 20 3470 0470
 Brand Communications          Joint Broker

 Alan Green                    CMC Markets UK Plc

 Tel: +44 (0) 7976 431608      Douglas Crippen

                               +44 (0) 020 3003 8632

 

Updates on the Company's activities are regularly posted on its
website: www.mosmanoilandgas.com (http://www.mosmanoilandgas.com/)

 

Notes to editors

Mosman (AIM: MSMN) is a helium, hydrogen and hydrocarbon 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. The Company has several projects in
the US, in addition to royalty interests in Australia.

 

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