New Yellow Peak Claims Staked

Great Western Mining Corporation PLC (AIM - GWMO, Euronext Growth - 8GW), which is exploring and developing gold, silver and copper targets in the Walker Lane belt of Nevada, USA, announces the staking of a new group of 20 claims at Yellow Peak in the northeastern end of the Little Huntoon Valley.

HIGHLIGHTS

• Twenty new claims staked at Yellow Peak close to and on trend with the Huntoon Copper Project.
• Significant outcropping phyllic alteration identified which is a key indicator of porphyry-style mineralisation.
• Highly evolved granite phase identified through fieldwork, previously unrecognised in the region and strengthening evidence for a large-scale magmatic-hydrothermal system.

Great Western Chairman Brian Hall commented: "We are very pleased to have secured the rights to the Yellow Peak area which we believe will add significant value to the Huntoon Copper Project. The identification of previously unrecognised granites at Yellow Peak reinforces our belief that this region has the potential to host a substantial porphyry copper system and we will start work in earnest on these new claims, aiming to unlock value for shareholders.

In a complex and rapidly changing environment, domestic resources of copper in the U.S.A., already categorised as a critical metal, will become a more and more interesting commodity and we are well placed to move the Huntoon Copper Project forward. We will provide updates as exploration progresses."

YELLOW PEAK

Twenty new claims have been staked at Yellow Peak, situated close to the Company's established Huntoon Copper Project in Mineral County, Nevada. The decision to stake Yellow Peak was driven by the identification of extensive outcropping phyllic alteration, a recognised indicator of porphyry copper mineralisation, and the presence of a key highly evolved granite phase that has never previously been recorded in this region.

The phyllic alteration at Yellow Peak is characterised by quartz-sericite-pyrite assemblages across multiple exposures, indicative of high-level hydrothermal fluid alteration. Such features are commonly associated with shallow portions of porphyry copper systems and enhance the geological prospectivity of the area.

In addition, Great Western's technical team has identified a distinct, highly evolved granite phase within the Yellow Peak area, which likely correlates with the Crowne Point granite mapped by the Company at the centre of the West Huntoon copper prospect. This granite is geochemically distinct from other intrusive phases in the region and is typically associated with late-stage magmatic processes that can be linked to porphyry copper mineralisation. Identification of this phase is original work by Great Western and its independent porphyry consultant, Dr. Lawrence Carter. It is now understood to be associated with alteration and mineralisation over a number of sites over Great Western's claims in the northeastern end of the Huntoon and Little Huntoon Valleys.

The staking of the Yellow Peak area aligns with Great Western Mining's broader exploration model for the Huntoon Copper Project, where multiple lines of evidence continue to support the presence of a large-scale magmatic-hydrothermal system. Planned follow-up exploration, including detailed mapping, sampling, and geophysical surveying will investigate the area's potential.

Figure 1. Map showing area of new claims at Yellow Peak.

Figure 2. a) Zones of intense phyllic alteration; b) aplitic porphyry cut by multiple generations quartz veins containing relict sulphides; c & d) Igneous breccia contains boulders of Whiskey Flat granite cemented in a matrix of quartz rich aplitic porphyry or microgranite (equivalent to Crowne Point).