Rubix Uncovers Broad Zinc-Lead and Copper Zones at Paperbark Project

Significant Zinc-Lead Intercepts at JB Zone

Rubix Resources Limited has released assay results from its 2025 drilling program at the Paperbark Project in northwest Queensland, highlighting a substantial zinc-lead mineralised interval at the JB Zone. The standout intercept includes a broad 70.5-metre section averaging 1.35% zinc and 0.38% lead, with several narrower zones exhibiting notably higher grades, such as 1.5 metres at 8.35% zinc and 1.19% lead, and a remarkable 0.5-metre interval grading 20.6% zinc and 1.72% lead. These results confirm the JB Zone as a significant base metals target within the project area.

Emerging Copper Potential Beneath and at Grunter North

Beyond zinc and lead, the drilling program has revealed a material increase in copper concentrations beneath the JB Zone, with assays reaching up to 2460 parts per million copper below approximately 370 metres downhole. This copper mineralisation appears to be associated with disseminated sulphides, consistent with historic drilling results, suggesting a potential genetic link between copper and zinc mineralisation in the area.

At the Grunter North Prospect, although copper grades remain sub-economic, the presence of epithermal-style veins carrying copper, silver, and bismuth within altered and sheared granite is encouraging. These elemental associations are typical of magmatic-hydrothermal systems and may indicate fertile conditions for further copper discoveries. Elevated copper values up to 193.5ppm were recorded in sheared sediments and volcanics above granite, reinforcing the prospectivity of this target.

Geophysical Targets and Future Exploration

The drilling targeted chargeability anomalies identified through geophysical surveys, with two holes at Grunter North and one at the JB Zone. While the Central chargeability anomaly remains untested, it represents a compelling follow-up target for future exploration. The program was supported by Queensland's Collaborative Exploration Initiative, a government-funded scheme aimed at encouraging discovery of critical minerals in the state.

Rubix is currently finalising mineralogical analyses using advanced techniques and geochronological studies to better understand the timing and nature of mineralisation. These data will be critical in refining exploration models and guiding subsequent drilling campaigns.

Strategic Location and Project Outlook

The Paperbark Project is situated within the highly prospective Mount Isa Inlier, a region renowned for its rich base metal deposits. Its proximity to established mines such as Century and Gunpowder enhances its strategic value. Rubix’s ongoing exploration efforts, underpinned by robust assay results and government support, position the project well for advancing towards resource definition.