Patagonia Lithium has reached 200 metres depth at Cilon Well 8, reporting strong brine flow rates and specific gravity readings indicative of lithium presence, while confirming no environmental impact from drilling activities.
- Cilon Well 8 drilled to 200m with six successful packer tests
- Specific gravity up to 1.06 gm/cm3 suggests lithium concentration
- Packer flow rates reached as high as 706 L/hour
- Environmental report confirms no impact from drilling
- Investor briefing scheduled for 19 August 2026
Drilling Milestone and Brine Flow Rates at Cilon Well 8
Patagonia Lithium Ltd (ASX:PL3) has advanced its exploration at the Formentera/Cilon lithium brine project in Argentina, pushing drilling at Well 8 (JAM 26-08) to 200 metres depth. The company has completed six packer tests, with flow rates peaking at 705.9 litres per hour, a strong indicator of aquifer strength and brine productivity. Specific gravity measurements have increased to 1.06 gm/cm3, a positive marker for lithium concentration in the brine.
Geological Observations and Mineral Abundance
The drilling interval between 189 and 200 metres revealed predominantly unconsolidated fine brown sands with high porosity, interspersed with semi- to strongly consolidated sections exhibiting secondary carbonate cementation. Visual estimates of mineral abundance showed quartz dominating at 86-88%, with minor litharenite, halite, olivine, biotite, pyroxenite, calcite, and montmorillonite. While these visual estimates provide a snapshot of the core composition, Patagonia cautions they are not substitutes for laboratory assays which are pending.
Environmental Compliance and Next Steps
Patagonia's environmental report confirmed that drilling activities have had no detectable impact on the basin's hydrological balance or surrounding environment, an important milestone for regulatory compliance and community relations. The company plans to conduct a 72-hour pump test and further geophysical analyses, including Borehole Magnetic Resonance and Gamma tests, to better understand porosity and aquifer properties. Assay results from brine samples collected during packer tests are expected within three to four weeks.
Project Context and Upcoming Investor Engagement
The Formentera/Cilon project covers 19,500 hectares in Argentina's lithium triangle, with Patagonia also holding interests in the Tomas III project and mineral exploration concessions in Brazil. Since listing in March 2023, the company has reported encouraging lithium assays and pumping test results across multiple wells, underpinning an upgraded Mineral Resource Estimate of 551,400 tonnes LCE as of July 2025. An investor briefing hosted by Executive Chairman Phillip Thomas is scheduled for 19 August 2026, providing a forum for shareholders to hear detailed updates on drilling progress and forthcoming resource developments.
With drilling now targeting depths up to 600 metres at Well 8, where lithium concentration is expected to be higher between 250 and 400 metres, Patagonia Lithium's latest results continue to build a case for the project's potential. The combination of strong brine flow, increasing specific gravity, and environmental clearance sets a solid foundation for the next phase of exploration and resource evaluation.
Bottom Line?
Patagonia Lithium's steady drilling progress and robust brine flow at Cilon Well 8 reinforce the project's lithium potential, but forthcoming assay and pump test data will be critical to confirm resource quality.
Questions in the middle?
- How will the upcoming 72-hour pump test results influence the next Mineral Resource Estimate update?
- What lithium grades will laboratory assays confirm from the brine samples collected at depth?
- Can Patagonia maintain environmental compliance while accelerating deeper drilling to 600 metres?