How Infini Resources Uncovered a Structurally Controlled Uranium System at Portland Creek

Phase 2 Drilling Confirms Uranium Mineralisation

Infini Resources Ltd (ASX – I88) has announced encouraging assay results from its Phase 2 diamond drilling program at the Portland Creek Uranium Project in Newfoundland, Canada. Covering drillholes PCDD25-007 to PCDD25-018 (excluding PCDD25-011A), the assays confirm uranium mineralisation across five adjacent holes spanning more than 2 kilometres of strike length, with uranium grades reaching up to 347 ppm U3O8. This discovery validates Infini’s exploration model that envisages a structurally controlled, shear-hosted uranium system.

Structural Controls and Hydrothermal System

The uranium mineralisation is closely associated with fractured and sheared granitic host rocks, consistent with a hydrothermal system where uranium-bearing fluids have circulated through structural corridors. The presence of hematite-rich alteration zones along reactivated shear planes further supports this interpretation. Notably, uranium mineralisation tends to occur along subsidiary fractures adjacent to major fault zones, a hallmark of structurally controlled hydrothermal deposits.

Polymetallic Signatures Enhance Prospectivity

Beyond uranium, laboratory assays have identified elevated levels of molybdenum, zinc, and copper within the drill cores. These polymetallic signatures reinforce the presence of a fertile hydrothermal system at Portland Creek, suggesting potential for additional valuable mineralisation. For example, one interval in drillhole PCDD25-009A returned significant copper (up to 479 ppm), molybdenum (321 ppm), and zinc (676 ppm) concentrations.

Next Steps – Airborne Survey and Expanded Drilling

Infini is awaiting the final batch of Phase 2 assay results and the completion of a high-resolution airborne electromagnetic, magnetic, and radiometric survey expected in the second quarter of 2026. These datasets will be integrated with geological and structural interpretations to refine target prioritisation. A field program is planned to ground-truth priority targets through detailed mapping and surface geochemical sampling. The company aims to design an expanded exploration and drilling campaign for the second half of 2026, focusing on testing principal fluid pathways and structural traps controlling uranium mineralisation.

Exploration Upside and Challenges

While the Portland Creek Project remains at an early greenfield stage, the confirmation of uranium mineralisation across multiple targets materially reduces geological uncertainty. However, the source of exceptionally high uranium-in-soil anomalies, up to 7.5% U3O8 at Falls Lake, remains unresolved, representing a compelling target for future drilling. Numerous untested structural corridors and secondary fault splays across the project area offer significant exploration upside as Infini continues to refine its geological understanding.