REG - Mosman Oil & Gas Ltd - US Helium Projects Update

Mosman Oil and GasAnnouncement

Tue 08:30

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RNS Number : 6626W  Mosman Oil and Gas Limited  26 August 2025

26 August 2025

 

Mosman Oil and Gas Limited

("Mosman" or the "Company")

 

 

US Helium Projects Update

Mosman Oil and Gas Limited (AIM: MSMN), advancing helium, hydrogen and
hydrocarbon projects in the USA, is pleased to provide an operational update
on its Colorado helium portfolio, comprising the Sagebrush and Coyote Wash
projects.

Highlights

·      Contractor selection for the Sagebrush 3D seismic programme is
well advanced, with field operations targeted to begin in early October.

·      Sproule's independent verification of Sagebrush is progressing,
with economic and reservoir modelling now underway.

·      The permitting process at Coyote Wash continues to advance, with
regulatory engagement and further discussions scheduled.

·      Preliminary design work for surface facilities has been reviewed,
confirming no major technical barriers to future development.

Sagebrush - 3D Seismic

Mosman has reviewed bids for the planned 3D seismic survey at Sagebrush, which
is expected to cover approximately 16 square miles. The programme is
anticipated to commence in early October, subject to final contracting and
mobilisation. The seismic data will provide a much higher-resolution picture
of subsurface structures and potential helium and oil traps than currently
available, significantly de-risking future drilling. By mapping fault blocks
and closures in detail, Mosman aims to refine future drilling targets and
optimise well placement, providing confidence in both helium and hydrocarbon
prospectivity.

Sproule Independent Verification - Sagebrush

Sproule has now delivered an initial dataset covering engineering and resource
inputs, which is being refined. Economic modelling and the final independent
verification report are expected to follow. This work is an important step as
Sproule's scope of work includes a comprehensive review of geological and
engineering data, including historic gas sample analyses from the Sagebrush-1
well, which indicated a gas composition of 2.76% helium, 23% methane and other
hydrocarbon gases. The independent assessment is expected to provide estimates
of both contingent and prospective helium resources, further validating and
refining Mosman's internal estimates to support future development and
commercialisation efforts.

Coyote Wash - Permitting Progress

The permitting process continues to advance. Mosman has updated and
re-submitted regulatory documentation following feedback from governmental
agencies, and further discussions are scheduled in the coming weeks. This is
expected to bring the project closer to final approvals under the Indian
Mineral Development Agreement framework.

Surface Facilities

Mosman has also been assessing options for surface facilities required to
process helium once production is established. Initial reviews of plant design
and fabrication timelines have been encouraging, with no technical impediments
identified. This early work is important to ensure that Mosman can move
quickly from successful well testing into commercial helium sales, by aligning
subsurface development with a practical and scalable surface solution.

Mosman Interim-Chief Executive, Howard McLaughlin, commented: "Across Sagebrush and Coyote Wash we are executing at pace. At Sagebrush, seismic acquisition planning is well-advanced and we are targeting an early-October start, while Sproule's independent verification is moving toward economics and final reporting. At Coyote Wash, the IMDA package has been updated and resubmitted, with our BIA meeting set for early September. In parallel, our facilities workstream is progressing with credible vendors. These steps build on the recent Tribal approval for Sagebrush 3D seismic and position Mosman for a material period of newsflow and value-driving activity."

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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