Patagonia Lithium advances drilling at its Cilon project, achieving 200 metres depth with promising packer test results showing good aquifer strength and lithium brine characteristics. Environmental assessments confirm no impact, while further pump testing and resource updates are planned.
- Well 8 reaches 200m with six successful packer tests
- Specific gravity up to 1.06 gm/cm3 indicates lithium presence
- Packer flow rates peak at 705.9 L/hour
- Environmental report finds no drilling impact
- 72-hour pump test and resource update scheduled
Strong Aquifer Performance at 200m Depth
Patagonia Lithium Ltd (ASX:PL3) has made solid progress at its Cilon lithium brine project in Argentina, with Well 8 (JAM 26-08) now drilled to 200 metres. The company reported six packer tests completed along the wellbore, delivering flow rates as high as 705.9 litres per hour and specific gravities ranging from 1.04 to 1.06 gm/cm3. Executive Chairman Phillip Thomas highlighted these results as indicative of a robust aquifer, with the increasing specific gravity particularly encouraging for lithium concentration prospects.
The packer tests, which isolate sections of the well to extract brine samples, have so far demonstrated strong transmissivity and porosity in the unconsolidated fine sands encountered between 189 and 200 metres. Visual core logs confirm high porosity in these sands, although some strongly consolidated sections with carbonate cementation were also noted. The main lithium-bearing zone remains targeted at depths between 250 and 400 metres, where the aquifer is expected to concentrate brine lithium content further.
Environmental Compliance and Technical Rigor
Patagonia Lithium’s drilling activities have passed environmental scrutiny, with the company’s report confirming no adverse impacts on the local environment or the hydrological balance of the basin. This clearance supports the project's sustainability credentials in a region sensitive to water resource management.
Drilling employs industry-standard Boart Longyear LT190 core rigs with HQ3 diameter triple-tube drilling, achieving over 95% core recovery. Brine samples are rigorously collected using a packer airlift system, with multiple quality controls including duplicate sampling, blanks, and lithium standards to ensure assay accuracy. Samples are sent to certified laboratories Alex Stewart and Analytics NOA, both accredited under ISO/IEC 17025:2017 standards.
Next Steps Towards Resource Upgrade
The company plans to deepen Well 8 to a final target of 600 metres, continuing packer tests at increasing depths, with the next scheduled at 210 metres. A 72-hour pump test and borehole magnetic resonance (BMR) gamma tests are also slated to better quantify aquifer characteristics before updating the Mineral Resource Estimate (MRE). Patagonia Lithium’s last resource update in July 2025 pegged the Cilon and Formentera projects at 551,400 tonnes of lithium carbonate equivalent (LCE), with ongoing drilling expected to refine and potentially expand this figure.
Patagonia Lithium’s broader portfolio includes the Formentera and Tomas III projects in Argentina’s lithium triangle, alongside exploration concessions in Brazil targeting rare earth elements and niobium. The company’s steady drilling progress at Cilon follows recent advances including increased pumping rates at Well 2 and promising assays at Well 7, underscoring a methodical approach to resource development.
Investor Engagement and Market Positioning
Phillip Thomas will provide an investor briefing on 19 August 2026, offering a platform for shareholders to assess drilling progress and upcoming milestones. With lithium demand underpinning the electric vehicle and battery sectors, Patagonia Lithium’s methodical exploration and adherence to environmental standards position it as a notable player within the competitive lithium brine space.
Bottom Line?
Patagonia Lithium’s Well 8 results reinforce the potential for a high-quality lithium brine resource, but forthcoming pump tests and deeper drilling will be critical to confirm commercial viability.
Questions in the middle?
- Will the deeper drilling to 600m reveal higher lithium concentrations in the targeted aquifer zones?
- How will the upcoming 72-hour pump test influence the planned Mineral Resource Estimate update?
- What impact might evolving environmental regulations have on future drilling activities in the Salar de Jama region?