Gold Mountain Limited has reported robust assay results from thirteen diamond drill holes at its Irajuba IR-1 Prospect, expanding the rare earth mineralised footprint beyond initial targets to over 1.2 kilometres.
- Diamond drilling confirms multiple high-grade rare earth zones
- Notable intersections include 11m at 2,892 ppm TREO with 41.1% MREO
- Mineralisation extends beyond original Exploration Target area
- Saprolite and saprock horizons host consistent mineralisation
- Ongoing auger drilling and permitting for further diamond drilling
Drill Results Expand Rare Earth Footprint at Irajuba IR-1
Gold Mountain Limited (ASX:GMN) has pushed the boundaries of its rare earth discovery at the Irajuba IR-1 Prospect within the Down Under Project, Brazil, reporting assay results from thirteen diamond drill holes that extend the known mineralised zone to over 1.2 kilometres. This expansion goes beyond the previously defined Exploration Target, underscoring the scale and continuity of the rare earth system in this emerging province.
The standout intercepts include drillhole IRDD260090, which returned 11 metres grading 2,892 ppm Total Rare Earth Oxides (TREO) with a favourable 41.1% Magnet Rare Earth Oxides (MREO) ratio; a critical metric given the value of magnet rare earths in permanent magnet applications. Another highlight, IRDD260092, intersected 20 metres at 1,515 ppm TREO with 43.1% MREO, confirming multiple zones of significant mineralisation within the saprolite and saprock horizons.
Geological Continuity and Mineralisation Characteristics
The mineralised intervals are hosted predominantly in weathered saprolite and saprock layers, with some elevated rare earth grades detected above the principal saprolite horizon and within hydrothermally altered bedrock. Notably, higher-grade fresh bedrock intervals were identified but excluded from the reported mineralised intersections pending further evaluation.
Gold Mountain’s approach incorporates a nominal cut-off grade of 400 ppm TREO, with the length-weighted average MREO content across all significant intersections exceeding 41%. This high MREO proportion aligns with the company’s focus on magnet rare earth elements, which carry premium value due to their critical role in green technologies.
Ongoing Exploration and Broader Project Potential
Alongside diamond drilling, Gold Mountain is advancing auger drilling across several targets within the Down Under Project, including Capivara, Down Under Central, Varzedo, and Poções prospects. The company is also progressing permitting to enable further diamond drilling, aiming to build on the growing footprint of rare earth mineralisation.
Executive Director David Evans emphasised the significance of the results, noting the “scale and consistency” of mineralisation and the “continuity observed between drill sections” as key confidence factors. The expanded mineralised footprint and ongoing programs reinforce the Down Under Project’s potential as a substantial rare earth province.
Technical Rigor and Data Integrity
The drilling program employed HQ diameter core drilling with rigorous core recovery and geological logging protocols. Samples were analysed by ALS laboratories in Brazil and Peru using lithium borate fusion digestion and ICP-MS to ensure comprehensive rare earth element reporting. Quality control measures, including standards, blanks, and duplicates, were incorporated throughout.
The reported drill holes were spaced approximately 200 metres apart, providing a robust dataset to interpret geological continuity. All holes terminated in fresh bedrock, confirming full testing of the weathered profile. Geological sections illustrate substantial thickness and continuity of mineralisation along multiple cross-sections, supporting the robustness of the exploration results.
Bottom Line?
Gold Mountain’s latest drilling confirms a growing rare earth system at Irajuba IR-1, but upcoming resource updates and metallurgical testing will be pivotal in assessing economic potential.
Questions in the middle?
- How will metallurgical test results impact the recoverability of the magnet rare earth elements?
- What is the timeline and scope for converting the expanded mineralised footprint into a formal resource estimate?
- Can ongoing drilling at other prospects within the Down Under Project replicate or exceed the grades seen at Irajuba IR-1?