GoldArc Resources Uncovers Two Extensive Gold Mineralisation Corridors Over 600 Metres at Yttria, Leonora North

GoldArc’s Extensive Leonora North Landholding and Yttria’s Dual Mineral Potential

Operating in Western Australia’s Eastern Goldfields, GoldArc Resources holds a district-scale land package at Leonora North, encompassing multiple mineral prospects including Yttria. Historically developed as a rare earth element project, Yttria hosts a JORC Mineral Resource Estimate of 15 million tonnes at 490 ppm total rare earth oxide (TREO). Prior to this campaign, Yttria had not undergone systematic gold drilling despite its location within a region known for high-grade gold deposits.

The shift from REE to gold exploration at Yttria reflects GoldArc’s strategic evaluation of geochemical indicators. With an existing portfolio gold resource of 200,000 ounces, the company’s new gold exploration program at Yttria aims to expand its gold resource base within this promising geological district, potentially unlocking additional discovery opportunities complementary to its current assets.

Details of the 11,000-Metre Aircore Drilling Program

The reconnaissance aircore drilling comprised 363 holes totaling 11,010 metres, designed to test broad, low-grade gold anomalies initially identified during earlier vacuum and RC drilling focused on REE, yttrium, and scandium. Drill lines were spaced between 80 and 200 metres apart, with holes spaced 20 to 30 metres apart and drilled to refusal. Hole depths ranged from 1 to 83 metres, averaging 26.6 metres, covering approximately 1.4 km by 1.2 km primarily within tenements P37/8847 and P37/8889.

Sampling involved four-metre composite samples and one-metre bottom-hole samples. Gold assays were conducted using 25-gram aqua regia with mass spectrometry (AR25/MS), while bottom samples underwent multi-element analysis for 60 elements via four-acid digest (4A/MS) at Genalysis Intertek. The predominant lithology was fine-grained, low-thorium basalt equivalent to the Lunnon Basalt formation. This wide-spaced initial sampling was intended to identify target zones ahead of infill drilling, consistent with early-stage greenfields exploration.

Gold Mineralisation Results Across Two Separate Corridors

The aircore drilling returned significant gold intercepts including 11m at 0.330 g/t Au from 32m depth in hole YAC172 and 4m at 0.950 g/t Au from 16m depth in hole YAC341. Additional intercepts included 4m at 0.609 g/t Au, 4m at 0.522 g/t Au, 4m at 0.506 g/t Au, and 4m at 0.391 g/t Au from various holes. These results were reported using a 0.1 g/t gold lower cut-off, with full assay details available in the company’s appendix.

Gold mineralisation was generally associated with deeper weathering profiles and minor quartz veining in some locations. Drill fences in shallower, less weathered northern areas were less effective at detecting gold, indicating improved detection with increased weathering depth. Two distinct mineralised corridors each extend over 600 metres and remain open to the south in largely untested areas, suggesting multiple geological pathways for gold mineralisation at Yttria rather than a single continuous zone.

Arsenic and Tungsten Pathfinders Link Yttria to Mt Stirling Gold System

Gold mineralisation at Yttria is accompanied by arsenic and tungsten pathfinder elements, mirroring geochemical signatures found at GoldArc’s Mt Stirling deposit, which contains 137,000 ounces of gold. This correlation supports the interpretation that Yttria and Mt Stirling are part of genetically related mineral systems within the same district-scale geological framework. The presence of these pathfinder elements enhances confidence in the continuity and significance of the gold mineralisation identified in the aircore program.

Heat map analyses of gold and arsenic concentrations from the aircore assays further illustrate spatial relationships, reinforcing the interpretation of a coherent mineralisation system across Yttria and its broader prospect area. This shared geochemical signature suggests similar mineralising processes may be active at both sites, potentially supporting economic gold mineralisation at depth or along strike.

Structural Geometry and Dip Variations of the Two Gold Trends

Structural analysis revealed differing dip angles between the two mineralised corridors. The northeastern trend (holes YAC172 to YAC175) dips approximately 30 degrees southwest, while the southwestern trend (holes YAC040 to YAC042) dips steeper at about 45 degrees southwest. These variations indicate distinct structural controls, possibly reflecting different fault or shear zone orientations within Yttria.

Understanding these dip angles is crucial for designing follow-up RC drilling, as vertical or near-vertical holes will intersect mineralisation at varying angles, influencing true thickness and grade interpretations. Upcoming drilling programs will incorporate these structural insights to optimize testing of the depth and strike extent of both corridors.

New Gold Discovery Distinct from Existing REE JORC Resource

The gold mineralisation discovered at Yttria is geologically and spatially separate from the existing REE JORC Mineral Resource Estimate of 15 million tonnes at 490 ppm TREO. This distinction provides a new growth avenue outside GoldArc’s current 200,000-ounce gold resource base. The dual mineralisation potential at Yttria—REE and gold—offers strategic flexibility for project development and resource expansion.

While previous exploration prioritized REE, the recent aircore results demonstrate the merit of systematic gold exploration as a complementary or standalone target. This approach exemplifies efficient portfolio management by unlocking additional mineral potential through targeted reassessment and drilling.

Upcoming RC Drilling at Mt Stirling and Yttria Follow-Up Plans

GoldArc plans to commence a 5,500-metre RC drilling program at Mt Stirling in early August 2026, targeting multiple soil gold anomalies as part of its ongoing Leonora North exploration. Final assay results from the Stirling Well prospect are expected shortly, informing the design of this program.

Following Mt Stirling drilling, the company will initiate RC drilling at Yttria to test the two newly identified gold corridors. This phase will focus on delineating higher-grade zones at depth and along the open southern strike extensions. The phased approach prioritizes capital allocation and exploration efficiency across the district-scale portfolio, leveraging aircore data to guide focused infill drilling.

Exploration Risks and Untested Southern Extensions

Despite identifying two mineralised corridors exceeding 600 metres each, significant portions of the prospective area remain untested, particularly to the south. The open-ended nature of these trends presents both opportunity and exploration risk typical of early-stage projects. The wide drill spacing and reconnaissance nature of aircore drilling mean subtle or narrow high-grade zones may have been missed.

Transitioning to RC drilling will provide higher-quality samples and more detailed assessment, but the economic viability of any discoveries will depend on further resource definition and feasibility studies, which carry inherent geological and commercial risks.

Capital Deployment and Strategic Focus Within Leonora North

Investment in the 11,000-metre aircore program at Yttria reflects GoldArc’s strategic reassessment of its Leonora North assets. Testing gold potential at a historically REE-focused site demonstrates management’s flexible and opportunistic exploration approach. The use of cost-effective aircore drilling enabled identification of two significant gold corridors while maintaining capital discipline.

Coordinated sequencing of exploration activities—completing Yttria aircore drilling and planning Mt Stirling RC drilling for August 2026—maximizes operational efficiency and data integration. GoldArc emphasizes the district-scale nature of its landholding within a high-grade gold province, supporting a portfolio approach that balances exploration risk across multiple targets at various maturity stages.

Regional Geological Setting and Prospectivity of Eastern Goldfields

GoldArc’s projects are situated in the Eastern Goldfields of Western Australia, one of Australia’s premier gold-producing regions. The Leonora area, hosting Yttria and Mt Stirling, is recognized for its high-grade gold endowment. The presence of 137,000 ounces of gold at Mt Stirling and the recent discovery of two mineralised corridors at Yttria highlight the prospectivity of the Leonora North landholding for multiple gold systems.

The Lunnon Basalt formation, the main lithology intersected at Yttria, is a significant geological unit within the Eastern Goldfields. The association of gold mineralisation with this basaltic sequence and the arsenic-tungsten pathfinder suite provides a robust framework for understanding mineralisation processes. The proven gold endowment of the region supports GoldArc’s view of Leonora North as a highly prospective district-scale package with potential for further gold discoveries.