REG - Great Western Mining - Tungsten Mineralisation Confirmed at Defender

Great Western MiningAnnouncement

29/01/2026 07:00

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RNS Number : 8051Q  Great Western Mining Corp. plc  29 January 2026

 

Great Western Mining Corporation PLC / AIM: GWMO / Euronext Growth: 8GW

 

29 January 2026

GREAT WESTERN MINING CORPORATION PLC

("Great Western", "GWM" or the "Company")

 

Tungsten Mineralisation Confirmed at Defender

 

Great Western Mining Corporation PLC, a strategic minerals exploration and
development company, is pleased to announce assay results from a machine-cut
channel sampling programme at its Defender Tungsten Project ("Defender" or the
"Project") in Mineral County, Nevada USA.

 

HIGHLIGHTS

·    Two machine-cut channels completed in December 2025 at Defender
returned significant tungsten mineralisation:

o  Channel A intercepted 6 m (20ft) @ 0.17% WO(3), including 1 m (3ft) @
0.43% WO(3) (Table 1).

o  Channel B intercepted 16 m (52ft) @ 0.30% WO(3), including 2 m (7ft) @
0.66% WO(3) (Table 1).

·    Very low concentrations of potential penalty elements encountered
during WO(3) processing (Table 1).

·    Silver (Ag) mineralisation found in Channel B, with 2 m (6.5ft) @
2.95 g/t Ag in the garnet skarn and 3 m (10ft) @ 1.55 g/t Ag in granite.

 

Great Western Chairman Brian Hall commented: "In a rapidly changing world in
which tungsten has become a critical metal for defence and industrial use,
currently in short supply in the West, the confirmation of significant
mineralisation at Defender is a very exciting development for Great Western.
This initial channel sampling operation has confirmed the presence of
tungsten, which was previously indicated by soil and rock chip sampling last
year, with results firmly at the upper end of our expectations. Notably,
minerals that could impair processing such as molybdenum and lead were
immaterial in the results. We are now planning the next stages and will keep
shareholders informed."

 

DETAILS

Background

The Defender and Pine Crow tungsten skarns, which produced tungsten during
World War II, lie approximately 2 km northeast of and on trend with the
Company's M2 skarn copper resource. All these skarns occur at the contact
zones of Cretaceous granitic intrusions with limestones of the Jurassic Dunlap
Formation. Field mapping and grab sampling reported in June 2025 confirmed
scheelite-bearing skarns at both Defender and Pine Crow, with rock chip
samples recording up to 1.75% tungsten trioxide (WO(3)) (see RNS dated 16 June
2025). Soil sample geochemistry from the Defender and Pine Crow area shows
elevated tungsten, copper and zinc, which can be traced for at least 1.4 km
along strike following a granite-limestone contact, indicating extensions to
the outcropping skarn-style mineralisation at Pine Crow and Defender (see RNS
dated 27 October 2025).

 

Channel sampling

In December 2025, two channels were machine-cut to assess mineralisation by
collecting samples at 1 m intervals. Channel A was excavated across an
existing trench, while Channel B was cut across historic surface workings.
Channel start and end co-ordinates were measured by handheld GPS and the
channels measured by chain survey. All samples were submitted to American
Assay Laboratories, Sparks, Nevada.

 

The samples were analysed by ICP-OES and ICP-MS after both four acid-digest
(4AD) and sodium peroxide fusion digestion (methods IM-4AB52 and IO-NF43).
Quality control samples (duplicates, blanks, and certified reference
materials) were inserted by the Company and results reviewed prior to release.

 

The trenching programme delivered strong tungsten results from both channels.
Channel A returned 6 m (20ft) at 0.17% WO₃, including a high-grade interval
of 1 m (3ft) at 0.43% WO₃. Channel B produced an even stronger result of 16
m (52ft) at 0.30% WO₃, including 2 m (7ft) at 0.66% WO₃ (Table 1).

 

Channel B also demonstrated silver mineralisation, intersecting 2 m (7ft) at
2.95 g/t Ag within garnet skarn and 3 m (10ft) at 1.55 g/t Ag within granite.
Importantly, elements that could act as processing penalties for WO₃ were
recorded at very low concentrations (Table 1).

 

These results, supported by grab samples and a complete set of fully assayed
soils, including those collected in Spring 2025 but not previously analysed,
will be used to guide the next phase of exploration.

 

Figure 1: Map showing the location of the two machine-cut channels at Defender
and previously reported W (ppm) soil and rock chip samples. Coordinates in
EPSG 26911.

 

 

 

 

 

Figure 2: Meter sections across the outcropping skarn were surveyed, cut,
collected and bagged.

 

 

 

Table 1: Highlight channel sample assay intervals.

 Channel  From (m)  To (m)  Interval (m)  Lithology                       WO(3)% *  Ag g/t  Cu ppm  Mo ppm  Zn ppm  Includes
 A        11        17      6             Scheelite bearing garnet skarn  0.17      0       72      100     186     1 m @ 0.43% WO(3)

 B        2         18      16            Scheelite bearing garnet skarn  0.30      0.38    70      127     323     2 m @ 0.66% WO(3), 1m @ 0.55% WO(3) and 2 m @ 2.95 g/t Ag
 B        21        22      1             Scheelite bearing garnet skarn  0.38      0       8       208     161
 B        22        25      3             Granite                         0.04      1.55    74      22      120

*W ppm converted to WO(3)% by stoichiometric calculation.

 

Qualified Person Statement

The information in this announcement that relates to exploration results is
based on information reviewed by Dr Lawrence Carter MSc PhD MAusIMM who is an
Independent Geological Consultant. Dr Carter is a "Qualified Person" as
defined in the "Note for Mining and Oil & Gas Companies" which form part
of the AIM Rules for Companies. Dr Carter has reviewed and consented to the
inclusion in the announcement of the information in the form and context in
which it appears.

 

 

ENDS

 

For further information visit www.greatwesternmining.com or contact:

 

 Great Western Mining Corporation PLC
 Brian Hall, Chairman                                           c/o St Brides
 Max Williams, Finance Director                                 greatwesternmining@stbridespartners.co.uk
 Davy
 Nominated Adviser, Euronext Growth Adviser & Joint Broker
 Brian Garrahy                                                  +353 (0)1 679 6363
 Shard Capital Partners
 Joint Broker
 Andrew Gutmann / Erik Woolgar                                  +44 (0)20 7186 9008
 St Brides Partners
 Financial PR
 Susie Geliher / Isabel de Salis / Will Turner                  greatwesternmining@stbridespartners.co.uk

 

Notes

Great Western Mining Corporation PLC (AIM: GWMO / Euronext Growth: 8GW) is a
diversified exploration and development company focused on strategic minerals
across several 100%-owned claim groups in Mineral County, Nevada, one of the
world's most prolific and mining-friendly jurisdictions. Backed by an
experienced team, the Company is pursuing a multi-commodity strategy targeting
near-term development and longer term exploration while assessing farm-out and
joint venture opportunities to unlock broader portfolio value. As well as its
flagship Huntoon Copper Project, which hosts a JORC-compliant resource of 4.3
Mt at 0.45% Cu, with upside from undrilled porphyry targets, it has a pipeline
of gold, silver, and early-stage tungsten assets aligned with US critical
minerals priorities.

 

 

 

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