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

6 October 2025

GREAT WESTERN MINING CORPORATION PLC

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

Exploration Update

Drilling Commences Ahead of Schedule at West Huntoon

Great Western Mining Corporation PLC, a strategic and precious metals exploration and development company, is pleased to provide an update on its planned drilling programme at key targets in the Walker Lane belt of Nevada, USA.

·     Drilling commenced at West Huntoon ahead of schedule on Thursday 2 October and the first drill hole was nearing target depth on Friday 3 October.

·     This is the first hole in a 1,800-metre reverse circulation (RC) drilling programme at the high-priority Rhyolite Dome and West Huntoon prospects.

·     Great Western's dedicated operational and technical team is overseeing the campaign to maximise efficiency and data quality.

·     Drilling is expected to continue through October, with assay results to follow.

Great Western Chairman Brian Hall commented: "I am very pleased to advise shareholders that our fully funded drill programme has now commenced ahead of schedule, with the first hole nearing completion at West Huntoon. This marks the beginning of an exciting campaign to unlock the copper and precious metals potential of our claims in this highly prospective region. With drilling advancing at our high-priority targets at West Huntoon and work at Rhyolite Dome to follow at key locations defined by recent IP data, we are well positioned to deliver meaningful results.

"Shareholders can look forward to strong news flow through Q4, both from this drill programme and from assay results on our soil sampling at the high-grade Pine Crow/Defender Tungsten prospects. We look forward to providing further updates as this programme progresses."

Figure 1: Planned drill hole locations at West Huntoon

Figure 2: Drill rig on site at West Huntoon

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.