Encounter Resources Hits 10.4% Niobium Outside Resource Boundary at Aileron
Key Takeaways
- Drillhole EAL1513 returned 51m @ 5.0% Nb₂O₅ from 63m, including 13m @ 10.4% Nb₂O₅ — the highest-grade niobium intersection ever recorded at the Encounter Resources Green Deposit Niobium project.
- The result sits entirely outside the current Mineral Resource Estimate boundary, confirming a new high-grade northern extension rather than infill of known ground.
- EAL1513's peak grade of 10.4% Nb₂O₅ is more than six times the current Green Inferred MRE average of 1.6% Nb₂O₅, with direct implications for potential starter pit economics.
- Three rigs are currently active across Aileron, with a defined catalyst schedule running through late 2026 and into 2027, including Emily diamond hole results and Joyce aircore results both expected October 2026.
- The total Aileron Inferred Resource now stands at 120Mt @ 0.77% Nb₂O₅, with a high-grade subset of 26Mt @ 1.7% Nb₂O₅ — a base that further extensional drilling is actively growing.
Record niobium hit opens up new high-grade frontier at Aileron
Encounter Resources has announced the highest-grade niobium intersection to date at the Green Deposit, part of its Aileron Project in the West Arunta province of Western Australia. Drillhole EAL1513 returned 51m @ 5.0% Nb₂O₅ from 63m, including 6m @ 9.1% Nb₂O₅ from 66m and 13m @ 10.4% Nb₂O₅ from 80m.
Crucially, this hole sits outside the existing Mineral Resource Estimate (MRE) boundary for the Green Deposit, making it an extensional result rather than infill drilling. That distinction matters: the company is not simply confirming what it already knows exists — it is finding new high-grade ground. The current Green Inferred MRE stands at 19Mt @ 1.6% Nb₂O₅ at a 1.0% cut-off, within a broader envelope of 100Mt @ 0.71% Nb₂O₅ at a 0.25% cut-off. EAL1513’s grades are materially above both benchmarks. Three rigs are currently operating across Aileron, signalling strong program momentum and a steady pipeline of results through the remainder of 2026 and into 2027.
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What is niobium and why does grade matter so much?
Niobium is a critical mineral used primarily to strengthen steel alloys, enabling lighter, stronger, and more durable materials used in everything from automotive manufacturing to construction. Demand is also growing from battery and superalloy applications, adding a technology-metals dimension to its investment profile.
In any mining project, grade is the key economic variable. Think of it like the concentration of coffee in a cup: the stronger the brew, the less water you need to get the same hit. Higher grade means less rock must be mined and processed to produce the same amount of contained metal, which directly reduces costs and improves project economics.
For Aileron, the significance is clear. The current resource averages 1.6% Nb₂O₅ in the high-grade subset, but EAL1513 has intersected zones grading up to 10.4% Nb₂O₅, significantly above the current resource average. Identifying and incorporating these high-grade zones into potential starter pit scenarios could meaningfully reshape the project’s economic case.
Green Deposit — what the 2026 drill program is building toward
Infill and extensional drilling reshaping the resource
The existing Green MRE was built on relatively wide drill spacing, with 200m-spaced drill lines and hole spacing of 40–80m apart. The 2026 drill program has been designed to tighten that spacing, increase geological confidence, and define potential starter pit areas across the 4km-long deposit.
The 2026 program is part of a much larger commitment: the 70,000m drilling programme at Aileron was designed from the outset to systematically close drill spacing, expand resource boundaries, and generate a sustained flow of results across all deposits into 2027.
Results from the 2026 program at Green to date demonstrate the scale of what is being uncovered:
- EAL1452: 53m @ 2.9% Nb₂O₅ from 79m to end of hole, including 7m @ 5.0% and 20m @ 3.8%
- EAL1453: 38m @ 2.1% Nb₂O₅ from 41m, including 5m @ 4.1%
- EAL1454: 75m @ 2.4% Nb₂O₅ from 43m to end of hole, including 21m @ 3.4%
- EAL1456: 72m @ 2.0% Nb₂O₅ from 47m, including 19m @ 3.4%
- EAL1513: 51m @ 5.0% Nb₂O₅ from 63m, including 13m @ 10.4% ← highest-grade intersection to date
EAL1513 represents a high-grade northern extension to known mineralisation, sitting entirely outside the current MRE boundary. Further drilling is planned in this area to determine the extent of this high-grade zone.
Earlier high-grade niobium results at the West Arunta had already flagged the potential for zones materially above the resource average, with several intersections from prior programs establishing the grade profile that the 2026 infill campaign is now systematically confirming and extending.
Full resource picture
The Aileron Project’s total Inferred Resource has grown to 120Mt @ 0.77% Nb₂O₅, with a high-grade subset of 26Mt @ 1.7% Nb₂O₅ at the 1.0% cut-off. The table below presents the resource breakdown by deposit at the 1.0% Nb₂O₅ cut-off:
| Domain | Tonnes (Mt) | Grade (% Nb₂O₅) | Contained Nb₂O₅ (kt) |
|---|---|---|---|
| Green | 19 | 1.6% | 291 |
| Emily | 3.7 | 1.9% | 71 |
| Crean | 3.5 | 1.9% | 67 |
| Total | 26 | 1.7% | 430 |
Source: Aileron Project Inferred Mineral Resource Estimate (JORC 2012), 1.0% Nb₂O₅ cut-off. Figures rounded to reflect appropriate levels of confidence.
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MD’s perspective — and what comes next for investors
Managing Director Will Robinson addressed the significance of EAL1513 directly:
Will Robinson, Managing Director
“The tonnage and grade potential of Green and the broader Aileron deposits in the West Arunta continue to grow with every drill program. Current drill programs at Green, Emily and Joyce are providing a clear pathway to further resource growth and grade improvement, particularly in key potential starter pit areas. Our expectation was that, as we closed the existing wide drill-spacing we could intersect spectacular zones of high-grade mineralisation, which is exactly what is happening. These results reinforce our confidence in the potential for high-grade starter pits that could underpin a Tier 1 operation at Aileron. There is a significant pipeline of results to come, and we have three rigs operating across Aileron which ensures a steady flow of updates into 2027.”
For investors tracking the project’s de-risking trajectory, the near-term catalyst pipeline is well-defined:
- First diamond hole at Emily (testing depth extent, completed to 140m) — results expected October 2026, with subsequent holes planned before end of the 2026 season
- Further aircore results from Joyce — expected October 2026
- Continued infill and extensional drilling at Green, targeting high-grade potential starter pit areas
- Regional aircore drilling results through high-priority targets — update targeted by November 2026
- Key pre-development activities, including geotechnical and hydrogeological drilling, metallurgical testwork, and flora, fauna and heritage surveys
With three rigs active and a clearly defined results schedule running through late 2026 and into 2027, Encounter is building toward a potential resource upgrade that could define high-grade starter pit areas capable of underpinning a long-life mining operation at Aileron. Each new result adds a piece to that picture.
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