Great Western Mining Corporation Plc Announces Excellent Tungsten Recovery Rate from Bulk Sample

Bench-scale flotation at the Defender project delivered high tungsten recovery and strong grade uplift, supporting further test work towards saleable concentrate quality.

Rhea-AI Summary

Great Western Mining (GWMOF) reported excellent initial metallurgical test results from its Defender Tungsten Project in Nevada, based on bench-scale flotation work on a 750 kg representative bulk sample grading 0.35% WO₃.

The sequential sulphide pre-float removed sulphide contaminants into just 3.97% of total mass while retaining 99.46% of the tungsten in the main sink at 0.35% WO₃, indicating minimal loss of the target mineral before primary extraction. The subsequent column flotation stage recovered 92.98% of the remaining tungsten into a rougher concentrate grading 7.21% WO₃, representing substantial grade upgrading and a low-volume, clean concentrate with very low deleterious elements such as molybdenum.

The results confirm amenability to established flotation processing and will underpin the next phase of metallurgical work, focused on cleaner circuit optimisation and evaluating a mild regrind stage to move towards potential marketable product specifications.

Positive

• Rougher recovery 92.98% of tungsten from pre-treated material into concentrate
• Grade uplift from 0.35% WO₃ head grade to 7.21% WO₃ rougher concentrate
• Low mass pull 4.55% of total mass in primary recovery while capturing most tungsten
• Sulphide pre-float removed contaminants in 3.97% mass, retaining 99.46% of tungsten

Negative

• None.

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Metallurgical test results from Defender confirm amenability to standard processing

DUBLIN, IRELAND / ACCESS Newswire / September 16, 2026 / Great Western Mining Corporation PLC (AIM:GWMO)(Euronext Growth:8GW)(OTCQB:GWMOF), a strategic minerals exploration and development company, is pleased to announce highly encouraging initial metallurgical results from bench-scale flotation test work on representative run-of-mine material from its Defender Tungsten Project ("Defender" or the "Project") in Nevada, USA.

OVERVIEW

• Initial metallurgical test work at Defender has delivered high tungsten recovery and a substantial increase in tungsten grade.
• 92.98% of the tungsten was recovered from the pre-treated material into a rougher concentrate grading 7.21% WO₃, compared with a starting bulk sample grade of 0.35% WO₃.
• The results compare favourably with similar rougher test work undertaken by other regional skarn-hosted tungsten projects and support the potential to process Defender mineralisation using established flotation methods.
• Further test work will now focus on increasing the tungsten concentrate grade towards potential marketable product specifications.

Great Western CEO, Ed Loye, commented: "These preliminary results represent an excellent early milestone for Defender. Upgrading our 0.35% WO₃ bulk sample to a 7.21% WO₃ rougher concentrate while maintaining 93% recovery is a very encouraging result. This confirms that our metallurgical model is highly responsive right out of the gate. Additionally, very low levels of deleterious elements such as molybdenum were recorded, which is important as these can hinder further purification steps.

"We have established a remarkably clean, low-volume rougher concentrate that serves as the perfect springboard for our next phase of metallurgical test work."

DETAILS

As announced on 7 May 2026, Great Western commissioned Eriez Flotation Division ("Eriez") in Pennsylvania, USA, to undertake initial metallurgical test work on material from Defender to assess the amenability of the mineralised material to flotation and establish an initial processing route for the recovery and concentration of tungsten.

A 750 kg representative bulk sample was collected from mineralised material across approximately 1 km of strike between the Defender Mine in the east, the Dough God Mine and the Pine Crow Mine in the west. The sample had a homogenised head grade of 0.35% WO₃ and was crushed to P80 150µm before undergoing sequential sulphide and scheelite flotation test work.

The sequential testing successfully demonstrated the bulk sample's amenability to standard processing methods, achieving a high tungsten recovery rate alongside substantial grade upgrading during the preliminary rougher stages. The results compare favourably with similar rougher test work undertaken by other regional skarn-hosted tungsten projects.

The initial sulphide flotation stage, an essential pre-treatment step, successfully removed sulphide contaminants into a float stream representing just 3.97% of the total mass. The pre-float phase retained 99.46% of the tungsten within the main sink stream at a grade of 0.35% WO₃, resulting in minimal loss of the target mineral prior to the primary extraction stage.

Following sulphide removal, the tungsten-bearing stream was introduced to a flotation column using a specialised reagent suite optimised for skarn mineralogy. This primary recovery stage pulled just 4.55% of the total mass while recovering 92.98% of the remaining tungsten. The process upgraded the material to a clean, rougher concentrate grading 7.21% WO₃, compared with the original bulk sample head grade of 0.35% WO₃, and aligning with results from other regional skarn-hosted tungsten projects.

These preliminary results provide a strong technical foundation for the next stage of metallurgical work at Defender, supporting both the selection of the reagent suite and the effectiveness of the Eriez column configuration in suppressing silicate and calcium-rich waste rock. The high-recovery, clean, rougher concentrate generated from the representative bulk sample will now be used as feed material for the cleaner circuit optimisation tests, which will aim to further upgrade the material towards potential marketable product specifications.

As part of this follow-up work, Eriez will evaluate whether a mild regrind stage is required ahead of the cleaning cells to improve liberation of remaining trapped minerals without over-grinding the scheelite.

ENDS

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

Great Western Mining Corporation PLC
Brian Hall, Chairman	c/o St Brides
Ed Loye, CEO	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	greatwesternmining@stbridespartners.co.uk

Notes

Great Western Mining Corporation PLC (AIM:GWMO)(Euronext Growth:8GW)(OTCQB:GWMOF) is an exploration and development company focused on strategic minerals across several 100%-owned claim groups in Mineral County, Nevada, a highly prospective and mining-friendly jurisdiction. The Company has a strategic emphasis on tungsten, while continuing to advance its Huntoon Copper Project, which hosts a JORC-compliant resource of 4.3 Mt at 0.45% Cu with further porphyry upside. It also maintains exposure to gold and silver through exploration and tailings reprocessing opportunities, alongside evaluating farm-out and joint venture options to unlock wider portfolio value.

Forward Looking Statements

This announcement contains forward looking statements relating to the plans, activities and expectations of Great Western Mining Corporation PLC. Such statements include, but are not limited to, those concerning planned exploration programmes, anticipated timelines and potential mineral resource outcomes.

The results reported in this announcement are preliminary results based on initial flotation testing using Eriez's internal laboratory assessment and standards and are subject to additional QA/QC through third-party assay verification. These preliminary results should not be treated as definitive and may be subject to revision following completion of that verification process

Forward looking statements are typically identified by words such as "plan", "expect", "anticipate", "intend", "may", "could", "potential" or similar expressions. These statements are based on current expectations and assumptions and involve risks and uncertainties that could cause actual results to differ materially. Factors include geological risk, exploration and drilling results, permitting and regulatory approvals, funding availability, operational challenges, commodity price movements and general market conditions. No assurance can be given that any forward looking statements will prove to be accurate, and shareholders are cautioned not to place undue reliance on them.

This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com.

SOURCE: Great Western Mining Corporation PLC

View the original press release on ACCESS Newswire

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What material was used for the Defender metallurgical test work?

The test work used a 750 kg representative bulk sample collected from mineralised material over approximately 1 km of strike between the Defender Mine in the east and the Dough God and Pine Crow mines in the west. The homogenised head grade of this sample was 0.35% WO₃, and it was crushed to P80 150 μm before sequential sulphide and scheelite flotation.

Which laboratory carried out the Defender flotation test work and for what purpose?

Great Western commissioned Eriez Flotation Division in Pennsylvania, USA, to perform the initial metallurgical test work. The purpose was to assess the amenability of Defender mineralisation to flotation and to establish an initial processing route for the recovery and concentration of tungsten using standard flotation methods.

What are the next planned steps in metallurgical testing at Defender?

The current rougher concentrate will be used as feed for cleaner circuit optimisation tests, aiming to further upgrade the tungsten grade towards potential marketable product specifications. As part of this follow-up work, Eriez will also evaluate whether a mild regrind stage ahead of the cleaning cells is required to improve liberation of remaining trapped minerals without over-grinding scheelite.

How do the Defender results compare with other regional tungsten projects?

The rougher flotation results, including the recovery rate and 7.21% WO₃ concentrate grade, are reported to compare favourably with similar rougher test work from other regional skarn-hosted tungsten projects, supporting the potential to process Defender mineralisation using established flotation methods.