An independent Joint Ore Reserves Committee-compliant mineral resource estimate (MRE) for ASX-listed Aldoro Resources’ 85%-owned Kameelburg rare earth element/strontium/niobium project, in Namibia, has confirmed it as the world’s largest strontium resource, the company says.

It notes that this will establish the company as the holder of a globally strategic critical mineral asset of unprecedented scale outside China- and Iran-dominated supply chains.

Strontium is a critical input for ferrite magnets, specialty glass and defence applications.

The updated MRE, prepared by independent consultants Lily Valley International, outlines an inferred mineral resource of 597.07-million tonnes at 2.49% total rare earth oxides (TREO) equivalent at a 0.5% TREO cut-off grade, a 15% tonnage increase over the September 2025 Phase I MRE at an unchanged grade.

The high-grade subset reported at a 1% TREO cut-off has grown to 312.65-million tonnes at 2.87% TREO equivalent, resulting in a doubling of the high-grade tonnage previously reported, the company highlights.

For the first time, Aldoro is also reporting a maiden strontium mineral resource of 596.01-million tonnes at 2.17% strontium as a co-located by-product credit.

The strontium resource is hosted within and inclusive of the TREO mineral resource (that is, not additive).

Recent metallurgical testwork demonstrated 98.96% strontium extraction at ambient temperature, supporting this as a meaningful by-product stream alongside the primary rare earth element/niobium concentrate.

The MRE was based on 29 diamond drill holes – 24 from Phase 1 and five from Phase 2, for 12 044 m, supported by laboratory analysis with the final Kameelburg Phase 2 MRE expected to be released in June upon receipt of the final Phase 2 assays.

“This updated resource represents another transformational step-change for the Kameelburg project and further confirms the emergence of one of the world’s most significant multi-critical-mineral systems.

“Not only has the total resource tonnage continued to grow at consistent grade, but the high-grade core has more than doubled in scale. Importantly, we have now formally declared a maiden strontium resource and by-product credit, positioning Kameelburg as the largest known strontium resource globally. This is a major milestone for Aldoro and further highlights the unique strategic value of the project,” chairperson Quinn Li acclaims.

“What makes Kameelburg particularly exceptional is that these globally significant strontium resources exist within the same mineralised system as our world-class rare earth and niobium resources. We believe very few projects globally can demonstrate this scale, grade and multi-product potential within a single integrated carbonatite-hosted system.

“Supported by outstanding initial metallurgical leach recoveries for strontium and rare earths, together with the magnetite-rich domains currently being assessed as a potential iron by-product stream, Kameelburg is rapidly evolving into a genuinely world-class, multiproduct critical minerals project with the potential to become a long-life global supplier of strategic minerals,” she avers.