High Caesium Grades at Morro Grande Raise Stakes but Drilling Still Needed to Confirm Resource

Exceptional Surface Grades Confirm Morro Grande’s Potential

Perpetual Resources Ltd (ASX – PEC) has announced outstanding assay results from channel sampling at its Morro Grande prospect within the Igrejinha Project, located in Brazil’s renowned Lithium Valley. The highlight is a remarkable 0.9-metre interval grading 17% Caesium oxide (Cs2O), an exceptionally rare concentration for surface-exposed Lithium-Caesium-Tantalum (LCT) pegmatites. Alongside this, significant lithium values reinforce the prospect’s status as a highly fractionated and fertile pegmatite system.

These surface results build on prior drilling beneath the outcrop, which had already confirmed the presence of a high-value critical minerals pegmatite. The new data provide a more nuanced geological understanding, enabling Perpetual to refine its exploration strategy with greater precision.

Strategic Implications for Critical Minerals Exploration

Caesium is a critical mineral with limited global supply and growing demand, particularly in high-tech and energy sectors. The grades reported at Morro Grande are uncommon worldwide, especially from exposed pegmatites, positioning this project as a potentially significant source of both Caesium and Lithium. The spatial association of these elements suggests a zoned pegmatite architecture typical of world-class LCT systems.

Executive Chairman Julian Babarczy emphasised the importance of these findings, noting that the exceptional Caesium grades validate Morro Grande as a fertile LCT system and underscore the potential for unlocking substantial value through systematic exploration. The company is now advancing from rapid first-pass drilling to a more methodical approach, integrating channel sampling, soil geochemistry, and geological mapping to optimise drill targeting.

Next Steps – Trenching and Diamond Drilling

Perpetual plans an extensive trenching program across Morro Grande and the adjacent Mauricio Target to better define mineralisation zones before embarking on a follow-up diamond drilling campaign. This systematic phase aims to delineate high-grade zones at depth and assess the broader extent of the critical minerals system. The integration of multiple datasets will be crucial to refining resource estimates and advancing the project towards development.

Situated in Minas Gerais, Brazil’s mining heartland, the Igrejinha Project benefits from proximity to existing infrastructure and a mining-friendly jurisdiction. Perpetual’s portfolio in the region, including the Renaldinho Project, is strategically positioned within the Araçuaí Orogen, known for its prolific pegmatite-hosted lithium deposits.

Broader Market Context and Outlook

The confirmation of high-grade Caesium alongside lithium at Morro Grande enhances the project’s strategic value amid a global push for diversified critical minerals supply chains. While lithium remains a cornerstone of the new energy economy, caesium’s niche applications in electronics and specialty industries add a compelling dimension to Perpetual’s exploration narrative. Investors will be watching closely as the company progresses its trenching and drilling programs, which will be pivotal in translating these early-stage results into a defined resource.