Patagonia Lithium has cleared key environmental hurdles for its Formentera and Cilon mines in Argentina, advancing permits for a 1,000 tonne demonstration plant while drilling hits 150m depth at Well 7.
- Environmental Impact Assessments submitted for Formentera and Cilon
- Official notices served to provincial and indigenous authorities
- Well 7 drilling reaches 150m with successful packer test
- Demonstration plant permitting stage imminent
- Upcoming milestones include seismic surveys and resource estimate
Environmental Approvals Near Completion for Demonstration Plant
Patagonia Lithium Ltd (ASX:PL3) has taken a significant step towards operationalising its Formentera and Cilon lithium brine projects in Argentina by submitting Environmental Impact Assessments (EIA) to the Jujuy Mines Department and the Olaroz Chico Indigenous Community. These submissions clear a critical regulatory hurdle ahead of the planned 1,000 tonne lithium carbonate demonstration plant.
The company confirmed that official notices related to these EIAs have been duly served to the Provincial Directorate of Real Estate, Secretariat of Territorial Planning and Housing, and Secretariat of Indigenous Peoples, with acknowledgments received on 5 May 2026. The final EIA document is currently being printed and will be formally submitted for circulation, setting the stage for a key UGAMP meeting involving the community and regulatory authorities.
Drilling Milestones Mark Progress at Formentera
On the drilling front, Well 7 at Formentera has successfully reached a depth of 150 metres, with a second packer test completed. These tests are crucial for assessing aquifer properties and brine flow rates, which underpin the project's economic viability. This latest drilling progress follows a series of encouraging results, including high porosity and lithium concentrations reported from earlier wells.
Recent packer tests have demonstrated promising aquifer characteristics, building on earlier findings such as the 110m packer test that yielded 857 litres per hour flow, which was documented just days prior. These results are expected to feed into an updated Mineral Resource Estimate (MRE), with assays from Well 7 and core porosity results from Well 6 among the upcoming data points to watch. The company also plans a passive seismic survey and 72-hour pump tests as part of its ongoing exploration program.
Strategic Positioning in Argentina and Brazil
Patagonia Lithium's footprint extends beyond Formentera and Cilon in Jujuy Province, with the Tomas III project in Salta Province also showing promise through MT geophysics surveys. In Brazil, the company holds five exploration concessions targeting ionic rare earth element clays, niobium, antimony, and lithium in pegmatites, including an area adjacent to the largest niobium producer, CMOC, in Goiás State.
Since its ASX listing in March 2023, Patagonia Lithium has steadily advanced its exploration program, with surface sampling, geophysics, and multiple drill holes completed. The company’s 2025 upgraded Mineral Resource Estimate stands at 551,400 tonnes of lithium carbonate equivalent (LCE), comprising both indicated and inferred resources.
These developments build on a series of positive assay and porosity results reported earlier this year, including a $2.79 million capital raise that bolstered the company’s cash position to $3.4 million, enabling continued drilling and permitting efforts. The recent packer test success and environmental submissions underscore Patagonia Lithium’s momentum towards demonstration plant commissioning and resource definition, critical steps for advancing its lithium brine projects in the lithium triangle.
Phil Thomas, Executive Chairman, emphasised the company’s forward trajectory: “We are moving forward on a number of fronts, with drilling going exceptionally well, and permitting being completed and ready to submit for the 1,000 tonne demonstration plant. The milestones in the pipeline include passive seismic survey, core porosity results for well six, assays from Well 7, 72 hour pump tests, and the mineral resource estimate.”
With regulatory clearances advancing and exploration results accumulating, Patagonia Lithium is poised for key updates in the coming months that will further clarify the scale and quality of its lithium brine resources and the feasibility of its demonstration plant.
Bottom Line?
Patagonia Lithium’s environmental approvals and drilling progress position it well for upcoming resource updates and demonstration plant permitting, though timing and operational risks remain.
Questions in the middle?
- When will the final EIA approval and UGAMP meeting be concluded?
- How will Well 7 assay results influence the upcoming Mineral Resource Estimate?
- What are the implications of the passive seismic survey for resource delineation?