Grant-supported AEM survey commences at Thunderball
Released
Released
Announcement PDF
ASX Release 3 November 2026
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Greenvale Energy Limited ABN: 54000743555 W: greenvaleenergy.com E: admin@greenvaleenergy.com.au
Registered Office: Ground Floor, 41-47 Colin St, West Perth, WA, 6005 Page | 1
GREENVALE COMMENCES GRANT-SUPPORTED AEM SURVEY
TO REFINE URANIUM DRILL TARGETS AT THUNDERBALL
Greenvale Energy Limited ASX:GRV (“Greenvale” or “the Company”) is pleased to announce the
commencement of a new tenement-wide high-resolution Airborne Electromagnetic (AEM) survey
across Exploration Licence (EL) 34157, located in the southern part of its Thunderball Uranium
Project in the Northern Territory (refer to Figure 1).
The approximately 950 line-kilometre SkyTEM survey will provide significantly improved
resolution compared with existing regional electromagnetic coverage, enhancing Greenvale’s
ability to interpret prospective geological features and refine its exploration targeting. The survey
has three main objectives:
Identify and map geological features that may influence the location and concentration of
uranium mineralisation, around known uranium prospects and project-level targets.
Improve the definition of potential sub-surface paleochannel systems identified by earlier
radiometric surveys1
.
Identify and map new structures and potential transport pathways for uranium-rich fluids.
Greenvale MD Alex Cheeseman said:
“This latest survey represents another important step in systematically assessing the uranium
potential at Thunderball and positioning Greenvale for an expanded drilling campaign in 2027 to
unlock the next generation of significant uranium discoveries in the NT.
1
Refer to ASX Announcement Airborne Survey Delivers 13 Priority Uranium Targets at Thunderball released 13 July 2026.
Highlights
New tenement-wide high-resolution Airborne Electromagnetic (AEM) survey
underway across Exploration Licence 34157, part of Greenvale’s broader Thunderball
Uranium Project in the Northern Territory.
Northern Territory Government co-funding secured for the program, through the
Round 19 Geophysics and Drilling Collaboration Grant scheme, supporting
Greenvale’s systematic exploration strategy at Thunderball.
Approximately 950 line-kilometres will be flown utilising the SkyTEM system, in-filling
existing electromagnetic data, providing significantly enhanced resolution on
potential paleochannels, reductant minerals and deeper structural systems.
All field-based work is scheduled to be completed in the first half of November, with
results expected in late-December 2026/early-January 2027.
The results of the survey will be utilised in the design of future drilling programs which
the Company expects to complete in the 2027 field season – with permitting and
regulatory approvals underway.
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“Throughout 2026, we have applied multiple exploration techniques, systematically building the
geological picture and progressing the project from broad greenfield exploration toward a
pipeline of higher-confidence drill targets. This work is critical and is positioning us to enter 2027
with multiple priority targets already advancing through the permitting process.
“As the 2026 field season approaches its close, we are keen to complete this important airborne
survey, so the results can inform our regional geological modelling and further strengthen our
drilling plans for the 2027 field season.
“Importantly, the program is being supported by the NT Government through the NT Geological
Survey and has been planned and conducted in close coordination with the pastoralists at
Douglas Station. Our field teams continue to build strong and constructive relationships with key
stakeholders across the Thunderball Project area, providing a solid platform for an expanded
exploration effort in 2027.”
Figure 1 – Project Location Map showing EL34157 within the Thunderball Uranium Project
AEM Survey underway
SkyTEM personnel mobilised to the Thunderball Project Area at the end of October and are
expecting to commence flying operations in the first week of November.
Greenvale’s survey is designed on a flight line spacing of 400m and will comprise approximately
950-line kilometres. The resulting data will in-fill existing data acquired by Geoscience Australia
in 2008-2009.
The planned survey lines have been designed on an East-West orientation with North-South
orientated tie lines, as shown in Figure 2. This is an optimal design for mapping features of
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multiple orientations, considered necessary for this part of the Pine Creek Orogen (PCO) where
there are three recognised, predominant, district-scale, structural trends.
Mineralisation trends in the district have also been noted to correlate with the major structural
trends, with known uranium occurrences appearing to coincide with NE-SW and NNW-SSE
orientations, and gold and copper workings and occurrences generally coinciding with NW-SE
and NNW-SSE orientations.
This correlation between the known mineral occurrences and the known structural orientations
is very important because it supports the following concepts:
The southern PCO is a polymetallic system with the potential for uranium, gold and copper to
occur together.
Gold and copper can be used as pathfinder minerals for uranium exploration.
The major fault and fold structures in the region are also transporting economically viable,
mineral-rich fluids throughout the system, which enhances the importance of structural
mapping using all possible methods.
Figure 2 – Greenvale’s Planned AEM survey and flight lines
The SkyTEM System
The SkyTEM312 FAST system is a helicopter-borne, Transient Electromagnetic (TEM) method
specifically designed to map shallow, near-surface, drainage features and deeper stratigraphic
and structural features to depths of approximately 500 metres (m) below ground surface.
The use of a helicopter-supported system provides greater logistical flexibility when surveying in
and around hills and escarpments, such as those commonly observed throughout the Pine Creek
Orogen. The SkyTEM312 system operates at speeds of up to 150 kilometres per hour (km/hr),
which presents a highly effective, time- and cost-efficient, survey method.
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The selection and use of the SkyTEM system for this AEM survey is particularly important for the
Thunderball Project, where exploration has already identified indications of multiple potential
uranium deposit styles. The SkyTem system uses a large transmitter loop suspended beneath
the helicopter, flown at low altitude, allowing it to generate high-resolution data across both
shallow and deeper parts of target area (refer to Figure 3).
This makes the SkyTEM system well suited to exploring for both near-surface palaeochannel-
style uranium targets and deeper, structurally controlled uranium mineralisation. For
Thunderball, this means that a single survey can assist Greenvale’s exploration team to better
define existing targets, identify new geological features associated with uranium mineralisation,
and potentially expand the Company’s exploration pipeline ahead of the 2027 drilling campaign
Figure 3 – Helicopter-borne airborne SkyTEM electromagnetic (AEM) survey system
Award of Exploration Grant
On 4 June 2026, Greenvale received an Exploration Grant from the NT Government’s Minister for
Mining and Energy, as part of Round 19 of the Geophysics and Drilling Collaboration Program, to
co-fund the AEM survey over EL34157.
The co-funding program run by the NT Government aims to encourage and boost the exploration
sector of the mining industry in the NT. In 2026, a record $4 million of co-funding support was
awarded to 34 projects from 26 companies.
Greenvale’s Geological Model
EL34157 straddles the geological contacts between the Daly Basin, the Birrindudu Basin and
metasediments of the older PCO, into which the Cullen Supersuite Granite has been intruded
(see Figure 4).
The south-western edge of the PCO, underlying EL34157, is orientated NW-SE, with predominant
cross-cutting fault structures orientated NE-SW. One major system is the Hayes Creek Fault
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Zone, highly significant for local uranium mineralisation, as evidenced by the position of the high-
grade Thunderball Uranium Deposit – with the Bella Rose, Wild Card, Wild Card South and
Spectre uranium prospects all aligned along fault splays coming off the main Hayes Creek Fault.
This structural system continues to the south-west, through EL34157, coinciding with magnetic,
radiometric, multispectral and geochemical anomalism.
Despite the known historical exploration in the area, Greenvale has identified gaps in the
geological understanding of the area, which until 2026 has been relatively underexplored. The
tighter line spacing of the planned AEM survey will enable enhanced mapping of stratigraphic
thickness, regional depth-to-basement contacts, structural orientations and palaeodrainage
features, all at a significantly improved resolution.
The objective is to significantly enhance any small, discrete anomalies from the earlier AEM
surveys, which can then be better correlated with existing datasets to produce refined, more
focused, drilling targets.
Figure 4 – Thunderball Uranium Project and regional geological setting, showing key
stratigraphic formations
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Next Steps
The SkyTEM survey is currently scheduled for completion within the coming fortnight, pending
weather and logistics in the Douglas-Daly region.
As this program advances, the Company is continuing to progress the approvals and permitting
process for drill targets to be tested in the 2027 field season.
Additional fieldwork is commencing for ground investigations of radiometric anomalies at the
Elkedra and Henbury Projects. The field work will involve geological mapping, geophysical
assessment with the RS-125 and pXRF, and collection of physical samples as completed over
the past few months at the Thunderball Project.
Authorised for release
This announcement has been approved for release by the Board of Directors.
For further information please contact
Alex Cheeseman Nicholas Read
Managing Director Read Corporate
E: admin@greenvaleenergy.com.au E: nicholas@readcorporate.com.au
M: +61(0) 485 603 120 M: +61(0)419 929 046
About Greenvale Energy Limited
Greenvale is an ASX-listed exploration company, committed to building a portfolio of projects that will
support the need for clean energy and critical infrastructure. The Company is building a large land holding
in the world-class Pine Creek region of the Northern Territory, and also owns the advanced, high-grade
Oasis Uranium Project in Queensland. The Company has additional new-energy/forward facing projects
including the strategically significant Alpha Project. Greenvale’s projects are all aligned with the global
need for reliable, sustainable, low-emissions energy and supply chains. The Company believes the best
way to create long-term shareholder value is by investing in exploration, to make discoveries and grow its
resource-base.
Forward Looking Statements
This announcement may contain certain forward-looking statements and projections. Such forward
looking statements/projections are estimates for discussion purposes only and should not be relied upon.
Forward looking statements/projections are inherently uncertain and may therefore differ materially from
results ultimately achieved. The Company does not make any representations and provides no warranties
concerning the accuracy of the projections and disclaims any obligation to update or revise any forward-
looking statements/projects based on new information, future events or otherwise except to the extent
required by applicable laws. While the information contained in this report hasbeenprepared in good faith,
neither the Company nor any of its directors, officers, agents, employees or advisors give any
representation or warranty, express or implied, as to the fairness, accuracy, completeness or correctness
of the information, opinions and conclusions contained in this announcement.
Competent Persons Statement
The information in this announcement, as it relates to exploration results, interpretations and conclusions,
is based on information reviewed by Ms Asha Rao who is General Manager – Exploration for Greenvale
Energy Ltd and is a Member of both the Australasian Institute of Mining and Metallurgy (AusIMM, #228188)
and the Australian Institute of Geoscientists (AIG, #6925). Ms Rao is a Consultant to the Company, and has
sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration,
and to the overseeing of activities being undertaken to qualify as a Competent Person (as defined in the
JORC 2012 edition of the “Australasian Code for Reporting of Mineral Resources and Ore Reserves”. Ms
Rao consents to the inclusion of this information in the form and context in which it appears.
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