Certified Assays Confirm Caesium Up to 28.3% Cs2O at Morro Grande
Perpetual Resources has certified exceptionally high caesium grades up to 28.3% Cs2O at its Morro Grande prospect in Brazil’s Lithium Valley, reinforcing its potential as a major critical minerals source.
- Certified overlimit assays confirm caesium grades up to 28.3% Cs2O
- High-grade samples sourced from historic pollucite mining waste dumps
- Recent drilling shows anomalous caesium, tin, tantalum, and tungsten mineralisation
- Morro Grande validated as a highly evolved LCT pegmatite system
- Follow-up diamond drilling and expanded exploration programs underway
Exceptional Caesium Grades Confirmed
Perpetual Resources Ltd (ASX – PEC) has announced certified overlimit assay results from its Morro Grande prospect within the Igrejinha Project in Brazil’s renowned Lithium Valley. The assays, conducted by ALS Laboratories in Brazil, confirm caesium oxide (Cs2O) grades reaching an extraordinary 28.3%, positioning Morro Grande among the highest-grade caesium occurrences globally.
These rock chip samples were collected from waste dumps adjacent to historic pollucite mining areas, a mineral rich in caesium, and recent Perpetual drilling. The results validate Morro Grande as a highly fractionated and mature lithium-caesium-tantalum (LCT) pegmatite system, known for hosting critical minerals essential to new energy technologies.
Geological Significance and Multi-Commodity Potential
The presence of pollucite, a rare caesium-bearing mineral, underscores the exceptional chemical evolution of the pegmatite system at Morro Grande. This level of fractionation is rare and indicates a highly mature geological environment capable of concentrating caesium alongside other critical elements such as tin, tantalum, and tungsten.
Recent drilling results complement the rock chip assays, revealing significant intercepts including 1 metre at 1.83% Cs2O, 2 metres at 2.5% tin, and noteworthy tantalum and tungsten grades. These findings suggest that high-grade caesium mineralisation occurs in discrete lenses within the pegmatite, enhancing the prospect’s economic potential.
Advancing Exploration and Development
Building on these promising results, Perpetual Resources is advancing a comprehensive exploration program. This includes geological mapping, soil and stream sediment sampling, and planned trenching to expose near-surface mineralisation. The company is also preparing for follow-up diamond drilling aimed at testing the depth and continuity of the mineralised system.
Additionally, exploration efforts are extending to the Renaldinho project area and investigating potential extensions of the pegmatite system towards the Gonçalves lithium target operated by Lithium Ionic. These initiatives reflect Perpetual’s strategic focus on expanding its critical minerals footprint within Brazil’s Lithium Valley.
Strategic Implications
Executive Chairman Julian Babarczy highlighted the significance of the assays, stating that Morro Grande’s mineralisation ranks among the highest grades reported worldwide. The results reinforce the company’s view of Morro Grande as a uniquely enriched LCT pegmatite system with exceptional potential to supply critical minerals vital for global new energy demands.
As global markets increasingly prioritise critical minerals for battery technologies and clean energy, Perpetual’s discoveries position it well to capitalize on this growing demand. The upcoming drilling campaigns will be pivotal in confirming the scale and economic viability of the Morro Grande deposit.
Bottom Line?
Perpetual’s high-grade caesium discovery at Morro Grande sets the stage for a critical minerals breakthrough in Brazil’s Lithium Valley.
Questions in the middle?
- Will upcoming diamond drilling confirm the continuity and scale of the high-grade caesium lenses?
- How might Morro Grande’s multi-commodity mineralisation impact Perpetual’s strategic partnerships or financing options?
- What are the implications of Morro Grande’s caesium grades for global critical minerals supply chains?
