West Huntoon soil and grab results

Great Western Mining Corporation PLC (AIM - GWMO, Euronext Growth - 8GW) announces positive results of soil and grab sampling at its West Huntoon porphyry copper prospect.

HIGHLIGHTS

• New soil results further extend the prospective area of the copper porphyry setting.
• The anomalous copper zone has now been expanded from approximately 2 km² to over 3 km².
• Infill soils in the highest-grade area confirm previous results with values of 954 and 571 ppm Cu.
• A selective grab sample taken from an outcropping vein returned very high values - 16.17 g/t gold, 207 g/t silver and 2.37% copper.

Great Western Chairman Brian Hall commented: "We are continuing to appraise our West Huntoon copper porphyry prospect and are gaining an ever better understanding of the relationship between the numerous prospects which make up the extensive Huntoon Copper Project. This season's field work has significantly increased the area of the copper anomaly at West Huntoon which is now the largest and highest-grade copper-in-soils anomaly in the wider Huntoon Copper Project.

"Further evidence of vein-hosted high precious metal grades is also welcome news. We have drill-ready prospects at West Huntoon and the novated Huntoon Mine Cooperation Agreement signed earlier this year will facilitate drilling at the centre of the West Huntoon target in the near-term. West Huntoon represents potential for a rapid upgrade of our copper portfolio."

INTRODUCTION

West Huntoon, located in the northwest of the Huntoon Valley in Mineral County, Nevada, is a key prospect within Great Western's Huntoon Copper Project where a resource of 19,000 T contained copper has already been established through extensive drilling by the Company. The Huntoon Copper Project is a cluster of five prospects at various stages in the exploration pipeline, all lying within a 6 km radius in the north of the Huntoon Valley. At West Huntoon, a zone of anomalous soils has now been expanded to over 3 km2 (740 acres) in area, with overlapping magnetic and chargeability anomalies and granite outcrops which indicate a classic porphyry setting. Follow-up soil sampling was undertaken this year to the northeast, over host rocks of a similar age to those in the core West Huntoon zone. This area is dominated by mafic porphyry outcrops with local copper showings. The host rocks are crosscut by an aplitic dyke swarm and some granitic bosses.

SOIL SAMPLES

During the summer field season 47 new soil samples were collected, with 38 taken in the northeastern area and 9 as an initial infill profile proximal to the best previous results in the centre of the existing anomaly (Figure 1). Results range between 21 and 954 ppm Cu, with a median value of 157 ppm Cu. These samples show good continuity in the copper anomalies reported. The northeastern samples expand the total area of the soils anomaly at West Huntoon by 50 ha (124 acres). The anomalous samples run to the edge of overlying cover, beyond which samples the potentially mineralised rocks are no longer accessible, indicating that continuation under this cover is highly likely. This pattern is repeated at multiple locations across the West Huntoon prospect. The infill profile produced two high grade samples (954 and 571 ppm Cu) which were adjacent to the strongest results in the previous survey, indicating good repeatability in this area.

Proving the continuity of anomalism to the northeast in the direction of the Company's copper resource at M2 is an important result. The 2024 IP surveys at West Huntoon identified a chargeability anomaly under the edge of the valley sediments proximal to this area and the identification of elevated copper directly adjacent to this target further supports its prospectivity. Additionally, during this fieldwork further small granitic intrusions were identified within this area.

Figure 1. Map to show locations of new soil samples relative to previously released data.

GRAB SAMPLES

Six selective grab samples were taken from the area, primarily for geochemical purposes (Table 1). However, one sample in the southwest of the area, from a mineralised vein structure 1 m long by 30 cm wide at outcrop, included strikingly high grades of 16.17 g/t Au, 207 g/t Ag and 2.37% Cu. Further outcrops of this vein are being sought. This sample provides further evidence that a series of high-grade veins are also present at West Huntoon, in addition to its large porphyry potential.

Table 1. Grab sample locations and grades for key metals.

121 MINING INVESTMENT FORUM

Great Western is participating in The 121 Mining Investment Forum in London on 14-15 November and the Company's presentation will be published shortly before the event.

ADDITIONAL INFORMATION

All soil and grab samples have been submitted to Paragon Geochemical Laboratories, Reno, Nevada. Soil samples were screened to -80 mesh and analysed by method FSAU-25, aqua regia digest with ICP-MS finish for a 51-element suite. Quality control samples were inserted by the company and results reviewed prior to release. Grab samples were analysed by method Au-FA30/AuAg-GR30 for gold (30 g fire assay, with gravimetric finish for overlimit samples) 35AR-OES for a 35-element suite via aqua regia digest and ICP-OES.