Extension of Tungsten Project Area

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

18 March 2026

GREAT WESTERN MINING CORPORATION PLC

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

Extension of Tungsten Project Area

Great Western Mining Corporation PLC, the AIM-quoted exploration and development company focused on mineral projects in the state of Nevada, USA, is pleased to announce that it has staked an additional 165.3 acres of claims contiguous to the Company's Defender-Pine Crow Tungsten Project in Mineral County, Nevada ("Defender-Pine Crow" or the "Project").

The expansion of its land package at Defender-Pine Crow consolidates the Company's footprint in an area which has demonstrated prospectivity for high-grade tungsten mineralisation.

· Eight new claim blocks, covering 165.3 acres (67 hectares), staked in Mineral County, Nevada and filed with both the county and with the federal Bureau of Land Management ("BLM").

· Extends the northern and eastern boundary of the Company's existing claim holdings in the Black Mountains.

· Provides an expanded buffer zone around the confirmed tungsten occurrences, which are a focus of the Company's current exploration activities.

Great Western CEO Ed Loye commented: "We are pleased to have secured these additional claim blocks at Defender-Pine Crow, further strengthening our land position in what is shaping up to be a very prospective tungsten district in Nevada. Results from the Project to date have been highly encouraging and the exploration team is excited about the potential we are seeing on the ground.

"Expanding our footprint in this area is therefore a natural step and an important part of our wider exploration strategy for 2026, which is focused on advancing Defender-Pine Crow towards a maiden Mineral Resource Estimate by the end of the year. These new claims not only extend our coverage to the north and east but also provide a wider operational buffer around the historic Defender workings.

"With winter conditions receding, our team will be back on site in the next few weeks to continue to implement this year's fully funded exploration programme and we are all eager to begin work and start feeding results back to the market. Encouraging results have already been achieved and with an expanded land package now in place, we look forward to building momentum at Defender-Pine Crow throughout the coming field season."

**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.