Infini Resources Drills Into High-Grade Uranium Targets at Portland Creek
Key Takeaways
- Phase 3 drilling has commenced at Infini Resources' 329 km² Portland Creek Uranium Project in Newfoundland, combining approximately 5,000m of diamond drilling with approximately 1,000m of parallel trenching — the most extensive programme in the project's history.
- Drill targets are defined by the convergence of three overlapping datasets: structural fault intersections, magnetic destruction boundaries, and uranium anomalism — with holes positioned at the interpreted transition from preserved to demagnetised granite.
- Phase 3 includes the first-ever drill test of demagnetised granite beneath the Falls Lake Prospect talus slope, where soil sampling previously returned a peak assay of 74,997 ppm U₃O₈.
- A separate southern cluster of high-grade soil samples, approximately 1.5 km from the Phase 2 drill programme, returned a peak of 1,500 ppm U₃O₈ — a distinct anomaly that adds to the district-scale target inventory.
- Infini also holds the Des Herbiers uranium deposit with a JORC 2012 Inferred Resource of 162 Mt @ 123 ppm U₃O₈ (43.95 Mlb), providing portfolio depth independent of Portland Creek Phase 3 outcomes.
Phase 3 drilling begins at Portland Creek as Infini targets district-scale uranium system
Diamond drilling has commenced at the Portland Creek Uranium Project in Newfoundland, Canada, marking the start of Infini Resources’ (ASX: I88) most extensive exploration programme to date. The Phase 3 programme combines approximately 5,000m of diamond drilling with approximately 1,000m of trenching running in parallel, with both workstreams now underway simultaneously.
The programme follows completion of Infini’s 2026 airborne magnetic, electromagnetic and radiometric surveys, field mapping, and a detailed reinterpretation of the project’s structural, geochemical and geophysical datasets. In CEO Rohan Bone’s framing, this work has transformed Portland Creek from “a scattering of uranium occurrences into a coherent, district-scale target set with defined geometry at depth and we are now drilling it.”
Drilling contractor Rodren Drilling and geological services provider Coast Mountain Geological (CMG) are supporting the programme on the ground.
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What the geophysics revealed and why it matters
Infini’s exploration model for Portland Creek is a structurally controlled, granite-hosted hydrothermal uranium system within the Long Range Complex. Three overlapping datasets define the drilling targets:
- Structural intersections: Two principal fault families within the Long Range Complex — an east-west striking set and a cross-cutting set striking north-northwest through north to north-northeast. Where these intersect, dilation and enhanced permeability are interpreted to occur.
- Magnetic destruction boundaries: High-resolution magnetic data has identified linear zones of low magnetic intensity, interpreted as granite demagnetised by oxidising hydrothermal fluids, flanking broader zones of preserved magnetic response.
- Uranium anomalism: Radiometric data and geochemical assays define uranium anomalism across the project area.
Drill holes are positioned where all three datasets converge — specifically at the transition from preserved magnetic response to demagnetised granite. This transition is considered a favourable setting because it may reflect a change in oxidation state conducive to uranium deposition.
The uranium signatures at Portland Creek and Reynolds Lake were defined across multiple sample media prior to Phase 3, with lake sediment, soil, and airborne radiometric data returning consistent anomalism that framed the current structural drilling targets.
Phase 3 includes the first drill test of demagnetised granite interpreted beneath the talus slope at the Falls Lake Prospect, where soil sampling returned assays up to approximately 7.5% U₃O₈ (refer ASX announcement 10 July 2024).
What is a hydrothermal uranium system and why do investors care?
A hydrothermal uranium system forms when hot, mineralising fluids move through fractured rock. When conditions change — particularly a shift in oxidation state — uranium dissolved in those fluids precipitates and concentrates in the surrounding rock. The key word for investors is structurally controlled: when the fracture geometry is favourable, these systems can be both large in extent and high in grade.
At Portland Creek, the geophysics has now defined that geometry at depth for the first time. Phase 3 is the first programme to drill directly into those defined targets, testing whether the surface uranium anomalism and interpreted structural plumbing connect to a meaningful mineralised system below.
Portland Creek by the numbers — the project’s exploration history in context
| Project Area | Key Anomaly | Peak Assay Result | Phase 3 Programme Scale |
|---|---|---|---|
| 329 km² | 6 km zone of anomalous uranium in lake sediments, soils and airborne radiometric data | 74,997 ppm U₃O₈ (soil sample, Falls Lake Prospect); peak soil anomaly ~800m x 100m | ~5,000m diamond drilling + ~1,000m trenching |
The 74,997 ppm U₃O₈ figure is a soil sample result from the Falls Lake Prospect. A separate southern cluster of high-grade soil samples has also been identified approximately 1.5 km from the Phase 2 drill programme, with a peak result of 1,500 ppm U₃O₈ — a distinct anomaly, not the same data point.
The Portland Creek project territory now spans 329 km², a scale established through successive claim expansions that consolidated the prospective ground around the Long Range Complex.
For broader portfolio context, Infini also holds the Des Herbiers uranium deposit, a separate asset with a JORC 2012 Inferred Resource of 162 Mt @ 123 ppm U₃O₈ (43.95 Mlb). This resource is unrelated to Portland Creek and is not the subject of Phase 3 drilling.
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What comes next — and what investors should watch
Rohan Bone, CEO, Infini Resources
“This is the moment the whole year has been building towards…”
“This is the most substantial exploration program in the project’s history, and we are excited to see what Phase 3 exploration delivers.”
With drilling now underway, the key watch items for investors from Phase 3 are:
- Drill results from Falls Lake Prospect — the first test of demagnetised granite beneath the talus slope, directly below one of the highest-grade uranium soil anomalies recorded at the project.
- Trenching results — the parallel ~1,000m trench programme is exposing bedrock for structural mapping and radiometric assessment, with findings expected to sharpen targeting in real time as drilling progresses.
- Structural and geochemical definition — any new targets emerging from the trench programme as it advances across the project area.
- District-scale system definition — whether Phase 3 results support the interpretation of a large, coherent hydrothermal uranium system across the full 329 km² project area.
Drill results will be released as they become available. Given the programme scale and the significance of Falls Lake as the first test of the demagnetised granite target, those initial results represent the most material near-term catalyst for the stock.
Ready to Follow Phase 3 Drilling at the Portland Creek Uranium Project?
Infini Resources (ASX: I88) has launched its most substantial exploration programme to date at the 329 km² Portland Creek Uranium Project, combining 5,000m of diamond drilling with 1,000m of parallel trenching to test a district-scale, structurally controlled hydrothermal uranium system for the first time at depth. With soil assays reaching 74,997 ppm U₃O₈ at the Falls Lake Prospect and a coherent geophysical model now defined, Phase 3 represents the most significant near-term catalyst in the project’s exploration history.
To stay across drill results as they are released and assess the full investment case, explore the Infini Resources project profile on Discovery Alert for the latest updates, announcements, and analysis.