Resouro Strategic Metals (ASX: RAU) uncovers up to 22.4% TiO₂ in Brazil — what the Northern Block assays reveal

Resouro Strategic Metals Inc. (ASX: RAU; TSX-V: RSM; OTCQB: RSGOF; FSE: 8TX) has announced the final set of auger drilling assay results from the Northern Block of its Tiros Titanium and Rare Earth Elements Project in Minas Gerais, Brazil, recording titanium dioxide (TiO₂) grades as high as 22.4% and total rare earth oxides (TREO) up to 13,074 parts per million. The Canadian-incorporated mineral exploration and development company said the latest data confirms continuity of high-grade mineralization near surface and supports the geological model for a large-scale critical minerals district.

The results, released on 13 August 2025 to the TSX Venture Exchange and on 14 August 2025 to the ASX, build on earlier Northern Block assays reported in April 2025. Out of the 18 auger holes included in this latest update, 16 intercepted significant mineralization, with grades observed down to the maximum auger depth of 15 metres. While the Northern Block assays highlight strong grade potential, Resouro has reiterated that immediate project activity remains focused on the Central Block due to its infrastructure access and ongoing metallurgical test work for a demonstration plant.

What are the key assay results from Resouro Strategic Metals’ Tiros Northern Block drill program?

The Northern Block, located more than 18 kilometres north of the Tiros Central Block, yielded several standout intercepts. These included 5 metres grading 22.4% TiO₂ and 7,146 ppm TREO from 2 metres depth in hole FT-48, 3 metres at 12.3% TiO₂ and 13,074 ppm TREO from surface in FT-53, and 4 metres at 23.9% TiO₂ and 7,427 ppm TREO from 8 metres in FT-63. These high-grade zones were defined using cut-off grades of 6,000 ppm TREO and/or 16% TiO₂, while broader mineralized intervals were reported using cut-offs of 1,000 ppm TREO and 6% TiO₂.

The mineralization is largely horizontal, and all drill holes were completed vertically. Resouro noted that much of the orebody is either exposed at surface or overlain by minimal overburden, particularly along the rim of the plateau where the Capacete Formation is preserved. In contrast, the plateau’s central top is capped by overburden up to 25 metres thick, but valley areas to the south expose mineralization directly, making them potentially favourable for early-stage extraction planning.

How does the Tiros Northern Block compare to the Central Block’s resource base?

The Central Block contains a National Instrument 43-101 Measured and Indicated Resource of 1.4 billion tonnes at 12% TiO₂ and 4,000 ppm TREO. This resource, first published in April 2025, includes 165 million tonnes of contained titanium dioxide and 5.5 million tonnes of TREO, making it one of the largest titanium-rare earth deposits in South America. High-grade domains in the Central Block average 23% TiO₂ and over 9,000 ppm TREO, while medium-grade areas average 11% TiO₂ and about 3,600 ppm TREO.

In context, the Northern Block assays suggest the mineralization’s high-grade potential extends well beyond the current Central Block resource footprint. Executive Chairman and CEO Christopher Eager said the results provide further evidence of the continuity and potential size of the project’s global exploration target, describing the Tiros mineral system as having district-scale potential.

What are the next technical steps Resouro Strategic Metals is taking at Tiros?

With the Northern Block auger program now complete, Resouro is shifting its focus entirely to metallurgical programs underway at CIT-Senai in Brazil and SGS Laboratories in Canada. These studies are designed to refine processing flowsheets for both titanium dioxide and rare earth elements, test recovery rates, and establish product specifications that align with downstream market requirements.

The company has also indicated that engineering studies linked to the Central Block will inform the design of a demonstration plant. This facility will be a key milestone, enabling scale-up testing of the metallurgical flowsheet and potentially positioning Tiros as a competitive source of critical minerals supply for both the Americas and export markets.

What does institutional sentiment indicate about Resouro Strategic Metals after the announcement?

Investor sentiment following the announcement has been generally constructive. Analysts following the rare earth and titanium sectors note that the results reduce geological risk and reinforce the view that the Tiros Project could become a significant long-term supply option. The near-surface nature of mineralization in both the Northern and Central Blocks could lower initial stripping ratios, potentially improving project economics.

On the ASX, Resouro Strategic Metals’ shares were last trading at A$0.215, valuing the company at approximately A$20.26 million. The stock has traded between A$0.150 and A$0.430 over the past 12 months and is down 49.41% year-on-year. For some investors, the latest drill results are seen as a catalyst for renewed interest, particularly if metallurgical testing confirms high recoveries at competitive costs.

How does the Tiros Project fit into the global titanium and rare earth supply picture?

The titanium dioxide from Tiros has potential applications in pigment production, aerospace materials, and advanced industrial coatings, while its rare earth elements — particularly neodymium and praseodymium — are critical inputs for permanent magnets used in electric vehicles, wind turbines, and high-efficiency motors. Global demand for these materials is expected to remain robust, driven by the clean energy transition, electrification of transport, and advanced manufacturing growth.

In the current geopolitical climate, where supply chain diversification for critical minerals is a strategic priority, Brazil’s position as a mining-friendly jurisdiction with established infrastructure adds to Tiros’ appeal. Minas Gerais, the state hosting the project, is home to an extensive mining services ecosystem, skilled workforce, and road and power networks that could support future development.

What is the long-term outlook for Resouro Strategic Metals at Tiros?

While immediate efforts remain centred on metallurgical and engineering work at the Central Block, the Northern Block’s high-grade results give Resouro flexibility in planning future expansion phases. Analysts suggest that, over time, the Northern Block could serve as a valuable satellite feed source to a Central Block processing facility or be developed as a standalone operation, depending on market conditions and capital availability.

In the medium term, the company’s ability to advance the project through technical milestones without significant delays will be critical to maintaining investor confidence. Longer term, success will hinge on securing strategic partnerships, offtake agreements, or financing packages that can support construction while aligning with the needs of end users in the titanium and rare earth markets.