REG - Great Western Mining - IP Survey & RC Drilling Results at Rhyolite Dome

Great Western MiningAnnouncement

28/01/2026 07:00

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RNS Number : 5438Q  Great Western Mining Corp. plc  28 January 2026

 

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

 

28 January 2026

GREAT WESTERN MINING CORPORATION PLC

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

 

IP Geophysical Survey & RC Drilling Programme Completed at Rhyolite Dome,

Olympic Gold Project

 

Great Western Mining Corporation PLC, a strategic minerals exploration and
development company, announces the results of an IP geophysical survey and the
assay results of a reverse circulation ("RC") drilling programme at Rhyolite
Dome, a previously undrilled prospect, which forms part of its Olympic Gold
epithermal precious metals project in the Walker Lane trend of Nevada
("Rhyolite Dome").

 

HIGHLIGHTS

·    Six IP survey lines completed, identifying a near-surface resistivity
anomaly associated with a fault and a deeper untested chargeable feature at
more than 300 m depth.

·    Four shallow RC holes totalling 2,315 ft (706 m) intersected
silicified, hydrothermally altered volcanic rocks consistent with an
epithermal system.

·    Low-grade gold and more significant silver mineralisation returned,
including 70 ft (21.3 m) at 1.64 g/t Ag.

·    Elevated pathfinder elements (Ba, As, Mn, Li, Sb) indicate shallow
levels of a hydrothermal system.

·    Geological model to be refined for better targeting of the deeper
chargeable IP anomaly.

 

Great Western Chairman Brian Hall commented: "We have already extensively
drilled at the Olympic Gold Project in the region of the prolific but now
worked-out OMCO Mine vein, intercepting gold at an extension of the mine and
at the Trafalgar Hill prospect on the western side of the claims area.  The
Great Western team regards Rhyolite Dome, one of the eight currently
identified prospects across the 800 acre (324 ha) claims area, to be a
prospect that merits further assessment and, in the second half of 2025, four
initial shallow holes were drilled following an IP survey to launch a maiden
exploration programme. While this first-pass drilling didn't return
significant precious-metal intercepts, it has materially advanced our
geological understanding. Combined with the high-quality geophysical dataset,
these results provide a strong technical foundation to refine targeting and
design the next phase of exploration at this highly prospective epithermal
gold prospect."

 

DETAILS

The Olympic Gold Project lies in a historically prolific low-sulphidation
epithermal gold district within the Walker Lane Trend, centred around the
past-producing OMCO Mine, which delivered exceptionally high grades of 25-30
g/t Au between the two world wars.  This is an area of gold-quartz veining
and brecciation associated with silica flooding.

 

Rhyolite Dome is located along the Olympic Gold fault zone, approximately
1.5km southeast of the OMCO Mine. The area shows coincident geophysics (IP
survey) and soil geochemistry anomalies, together with outcropping indications
of geological and structural prospectivity indicators, as previously reported
in 27 March 2024.

 

Six IP geophysical survey lines were successfully completed at Rhyolite Dome
(Figures 1 and 2). Data inversions identified a near-surface zone of anomalous
resistivity that coincides with a mapped fault zone, as well as a chargeable
feature at depth of approximately 25mrad located more than 300 m below
surface.

 

Four shallow RC drill holes were completed at Rhyolite Dome in November 2025
totalling 2,315 ft (706 m) (Figure 1). Drilling primarily targeted the
near-surface resistivity anomaly defined by the IP survey, while the deeper
chargeable feature was ultimately beyond the effective reach of the contracted
RC rig from the permitted drill pads. Drilling intercepted several intervals
of silicified rhyolite with locally common pyrite, together with
hydrothermally altered volcanic rocks. Low concentrations of gold were
encountered, with maximum intercepts of 5 ft (1.5 m) at 0.12 g/t Au and 5 ft
(1.5 m) at 0.11 g/t Au in hole RDRC005 (Table 1). More significant silver
intercepts were returned, including 70 ft (21.3 m) at 1.64 g/t Ag and 0.03 g/t
Au in hole RDRC004, as well as 15 ft (4.6 m) at 1.13 g/t Ag and 0.05 g/t Au
(Table 1).

 

Elevated concentrations of pathfinder elements were recorded across the drill
hole assays, including barium (Ba, consistently greater than 1,000 ppm),
arsenic (As, consistently greater than 200 ppm and up to 3,820 ppm), manganese
(Mn, with several intervals exceeding 1,000 ppm), lithium (Li, consistently
greater than 50 ppm) and antimony (Sb, with various intervals above 100 ppm).
These geochemical signatures are consistent with the shallow levels of a
hydrothermal system.

 

On the basis of these results, the geological framework for the Olympic Gold
Project will now be revisited to refine future exploration targeting,
particularly with respect to the chargeable feature that remains untested by
this shallow RC drilling programme.

 

Figure 1: Map showing the location of the IP geophysical survey lines and
drill collars and previously reported soil sampling survey. Coordinates in
EPSG 26911.

 

 

Figure 2: Inversions of the IP geophysical survey data (Left = resistivity,
right = chargeability).

 

 Hole     X       Y        Azi/Dip  From (ft)  To (Ft)  Interval (ft)  Au (g/t)  Ag (g/t)
 RDRC005  422722  4272332  135/-70  90         95       5              0.12      1.21
          125              130                 5                       0.11      0.29
 RDRC004  422722  4272332  270/-45  240        310      70             0.03      1.64
 RDRC001  423093  4272498  200/-60  445        460      15             0.05      1.13

Table 1: Highlight drill hole assay intervals. Coordinates in EPSG 26911.

 

Additional Information

RC chip samples were logged and collected at 5ft (1.5 m) intervals and
submitted to ALS laboratories, Reno, Nevada. Samples were analysed by methods
ME-MS61 and Au-AA25. Quality control samples (duplicates, blanks and certified
reference materials) were inserted by the Company and results reviewed prior
to release. Down hole surveys were completed for every hole.

 

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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