Maverick Springs Drill Core Shows 30.69m at 0.11% Antimony, Surpassing US Peers

Antimony Emerges as a Strategic Asset at Maverick Springs

Sun Silver Limited (ASX, SS1) has delivered a compelling update on its Maverick Springs Silver-Gold Project in Nevada, revealing wide zones of antimony mineralisation confirmed through re-assayed historical drill core. The standout intercept from hole MR059 returned 30.69 metres grading 0.11% antimony, including a higher-grade 1.1-metre section at 0.48% Sb. This is notably higher than the average grades reported at Perpetua Resources’ Stibnite Project, a comparable US critical mineral operation.

Adding to the excitement, visual identification of stibnite; the primary antimony mineral; has been confirmed in historical drill cores MR063 and MR103, with assay results for these holes expected imminently. Surface rock chip sampling further corroborates the presence of antimony mineralisation at outcrop, with assays up to 0.22% Sb, underscoring the potential for near-surface access and targeted drilling.

Expanding the Critical Mineral Footprint

The company is undertaking a large-scale re-assay program on historical drill core and pulps, initially focused on silver and gold, now expanded to multi-element testing including antimony. This program has already uncovered missing intervals in historic pulps, which may have led to underestimation of antimony grades. Sun Silver anticipates that re-sampling of half core in the future could enhance grade continuity and overall resource confidence.

With approximately 30 additional historical holes submitted for multi-element assay, the company is methodically expanding its understanding of the distribution and scale of antimony mineralisation within the broader silver-gold system. This approach aligns with the growing strategic importance of antimony, a critical mineral essential for defence and industrial applications.

Strategic Engagement with US Defence Authorities

Sun Silver has finalized a defence-focused white paper for submission to the US Department of Defence, positioning the Maverick Springs Project as a secure domestic source of antimony. Antimony’s applications in armour-piercing munitions, military-grade flame retardants, thermoelectric devices, and high-density batteries make it a mineral of national security interest.

The white paper outlines technical, geostrategic, and policy rationales and seeks to qualify the project for federal assistance programs such as the Defense Production Act Title III and other strategic materials initiatives. Successful engagement could unlock non-dilutive funding, government-backed offtake agreements, or co-investment opportunities, accelerating project development and permitting.

Robust Resource Base in a Premier Mining Jurisdiction

The Maverick Springs Project hosts a substantial JORC Inferred Mineral Resource of 218 million tonnes grading 42.2 grams per tonne silver and 0.31 grams per tonne gold, equating to nearly 480 million ounces of silver equivalent. Located in Nevada, a jurisdiction ranked number one globally for mining investment attractiveness, the project benefits from proximity to established mining infrastructure and world-class operations such as Barrick’s Carlin Mine.

Importantly, the deposit remains open along strike and at depth, with multiple mineralised intercepts outside the current resource model, offering significant upside potential. The integration of antimony into the project’s commodity mix could materially enhance its strategic and economic value.