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

2 March 2026

GREAT WESTERN MINING CORPORATION PLC

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

Tungsten Exploration Programme Planning & Live Investor Presentation

Accelerating the Defender Tungsten Project in Nevada Towards a Maiden MRE

Great Western Mining Corporation PLC, a strategic minerals exploration and development company, is pleased to update investors on its upcoming exploration plans at the Defender-Pine Crow Tungsten Project ("Defender" or the "Project") in Mineral County, Nevada USA. This follows the receipt of highly encouraging assay results at Defender announced in January 2026.

Highlights

·    Accelerating exploration activity with the objective of defining a maiden Mineral Resource Estimate ("MRE") in Q4 2026.

·    Assessing a 3 km long mineralised trend between Defender and the Company's existing MRE at M2, as shown in Figure 1 below, through detailed mapping and geophysical surveys commencing in March.

·    Commencing groundwork in April to prepare drill pads, ahead of the planned start of drilling in June.

·    Anticipating additional assay results from new channel cuts in Q2.

Great Western Chairman Brian Hall commented: "Defender is shaping up to have the potential to become a tungsten discovery of considerable scale and significance. Its geological setting, noting its proximity to Guardian Metals' Pilot Mountain Project approximately 30 miles away, reinforces our confidence that we are operating within a highly prospective polymetallic district.

"We have designed the upcoming exploration programme to accelerate progress toward a maiden MRE, which we see as a key catalyst in unlocking value at Defender and across our broader portfolio. Importantly, Defender appears to represent the far eastern extension of a mineralised trend that includes our M2 resource, located more than 3 km to the southwest, highlighting the potential continuity and district-scale opportunity.

"This is clearly an underexplored area with substantial upside and we are eager to commence systematic work to define the full scale of the mineralised system."

DETAILS

Background

The Defender and Pine Crow tungsten skarns are located approximately 3 km northeast of and on trend with the Company's M2 skarn copper resource. Historic production of tungsten from these skarns dates back to a short spell of extraction towards the end of the Second World War.

Following earlier positive field mapping and grab sampling, in December 2025 the Company undertook a machine-cut channel sampling programme at Defender. Two channels returned significant tungsten mineralisation, including 6 m at 0.17% WO₃, including 1 m at 0.43% WO₃, and 16 m at 0.30% WO₃, including 2 m at 0.66% WO₃ (see RNS dated 29 January 2026). Importantly, elements that could represent potential processing penalties were recorded at very low concentrations, and silver mineralisation was also intersected within Channel B.

2026 Exploration Programme

Following a successful fundraise completed in January 2026, the Company is fully funded to execute an expanded exploration programme at Defender during 2026. Accordingly, the Company has designed a programme to accelerate progress towards defining a maiden MRE, targeted for Q4 2026, and to test the scale, continuity and geometry of the mineralised system at Defender, including its potential relationship to the broader mineralised trend extending towards M2, located more than 3 km to the southwest.

Detailed geological mapping and geophysical surveys will commence in March 2026 to assess the mineralised trend between Defender and the Company's existing MRE at M2, as shown in Figure 1. This work is intended to refine the geological model and support drill targeting initially at the eastern end of the trend. Groundworks are scheduled to begin in April to prepare the drill pads, ahead of the commencement of drilling. Bids from drilling contractors are currently being sought for the programme, with the objective of starting drilling in June 2026.  In parallel, additional assay results from newly completed channel cuts are expected in Q2 2026 and will be incorporated into the exploration model.

Figure 1: Mineralised trend between Defender and M2 MRE, together with results from the December 2025 machine-cut channel sampling programme (inset).

Corporate Presentation & Live Investor Call

The Company is pleased to announce that an updated corporate presentation has been published on its website: www.greatwesternmining.com.

In addition, Ed Loye, CEO, and Brian Hall, Executive Chairman, will provide a live presentation via Investor Meet Company on 9 March 2026 at 11.00 GMT.

The presentation is open to all existing and potential shareholders. Questions can be submitted pre-event via your Investor Meet Company dashboard up until 09.00 GMT on 8 March 2026, or at any time during the live presentation.

Investors can sign up to Investor Meet Company for free and add to meet Great Western via:

https://www.investormeetcompany.com/great-western-mining-corporation-plc/register-investor

Investors who already follow Great Western on the Investor Meet Company platform will automatically be invited.

ENDS

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

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.

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. 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.