Exciting Drilling Results Uncover New Resources at Encounter’s Aileron Project

Encounter Resources Strikes High-Grade Niobium in First Line of 2025 West Arunta Drilling

Encounter Resources (ASX: ENR) has hit the ground running in its 2025 West Arunta drilling campaign, announcing high-grade niobium mineralization from the very first line of drilling at its Joyce Prospect within the Aileron Project. The intercept of 9m @ 2.2% Nb₂O₅ from 120m (to end of hole) validates the company's regional targeting model and sets a promising tone for the planned 40,000m program.

Strategic Discovery Extends West Arunta Niobium Province

The Joyce discovery is particularly significant as it's located approximately 6km east of Encounter's established Green deposit (12.1Mt @ 1.63% Nb₂O₅), suggesting a much broader niobium-rich system than previously defined. This early success points to the substantial untapped potential across Encounter Resources' extensive West Arunta tenure.

"The first line of aircore drilling for the 2025 field season has delivered a high-grade niobium intercept, an outstanding result from a step-out ~6km east of the Green deposit. To encounter high-grade mineralisation in reconnaissance drilling illustrates how much more there is still to be found in this new mineral province… Given the scale and fertility of the systems, the most significant discoveries may still be ahead of us." – Will Robinson, Executive Chairman

What Makes This Intercept Significant?

The high-grade nature of the intercept is noteworthy for several reasons:

• The hole ended in mineralization at 129m (aircore depth limit), meaning the full width and depth extent remains open
• The grade (2.2% Nb₂O₅) compares favorably to the company's established resources at Green (1.63% Nb₂O₅) and Crean (1.92% Nb₂O₅)
• The discovery came from the first pass of wide-spaced (800m) drilling in a previously untested area
• The mineralogy is hosted in carbonatite, a well-established source rock for economic niobium deposits globally

Understanding Carbonatites: The Key to West Arunta's Critical Mineral Potential

Carbonatites are rare igneous rocks that contain more than 50% carbonate minerals and are among the world's primary sources of niobium, rare earth elements, and phosphates. What makes them particularly valuable is their tendency to host high concentrations of these elements compared to most other rock types.

In the West Arunta region, Encounter Resources has identified multiple carbonatite discoveries along major controlling structures like the Elephant Island and Weddell Faults. These structures appear to be important pathways for carbonatite emplacement and subsequent mineralization.

For investors, carbonatite-hosted deposits are attractive because they often feature:

• Higher grades than other deposit types
• Large tonnage potential
• Multiple valuable elements (niobium, REEs, phosphate)
• Relatively simple mineralogy for processing

Systematic Exploration Approach Driving Success

Encounter Resources' exploration strategy in the West Arunta follows a methodical, science-driven approach:

1. Regional Target Generation: The company has identified 15 priority targets for testing in 2025
2. Reconnaissance Drilling: Wide-spaced (800m) aircore lines to identify mineralized systems
3. Target Definition: Following discovery, ground geophysics and closer-spaced drilling to define high-grade zones
4. Resource Definition: RC and diamond drilling to establish resources at confirmed prospects

This approach has proven successful with the company's existing resources at the Green (12.1Mt @ 1.63% Nb₂O₅) and Crean (3.5Mt @ 1.92% Nb₂O₅) deposits, and now appears to be yielding results at Joyce.

Next Steps: Accelerating Exploration Momentum

Following this early success at Joyce, Encounter Resources has outlined several near-term initiatives:

• Depth Testing: RC drilling in the coming weeks to determine the full extent of high-grade mineralization
• Geophysical Imaging: Ground gravity and/or passive seismic surveys to map deeper weathering zones that may host metal enrichment
• Regional Advancement: The aircore rig has already moved to the Steller prospect, 15km north along the prospective Elephant Island Fault
• Further Results: Additional assays from Joyce expected in August 2025

Investment Thesis: West Arunta Critical Minerals Leader

Encounter Resources has positioned itself as the dominant player in the emerging West Arunta critical minerals province. The company's investment case is compelling for several reasons:

Why Investors Should Follow Encounter Resources

Encounter Resources offers a unique investment opportunity in the critical minerals space for several compelling reasons:

1. Emerging District Control: The company holds a commanding land position in what's shaping up to be Australia's premier niobium province

2. Discovery Stage Valuation: With early resources established and new discoveries like Joyce emerging, the company is at the inflection point where significant value can be created

3. Critical Mineral Exposure: Niobium is essential for high-strength steel alloys used in infrastructure, aerospace, and clean energy applications, with limited global production sources

4. Exploration Momentum: The 40,000m 2025 drilling results Encounter Resources program provides regular news flow and discovery potential across 15 targets

5. Australian Jurisdiction: Projects located in Western Australia, a premier mining jurisdiction with established infrastructure and regulatory framework

With high-grade results from the very first line of the 2025 campaign, Encounter Resources' systematic exploration approach continues to deliver results in the West Arunta. As the scale of the carbonatite-hosted niobium system expands with discoveries like Joyce, investors have multiple potential catalysts ahead in what's rapidly emerging as a dominant copper hotspot for significant new critical minerals province.

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