Argentina Lithium & Energy Corp. (TSX-V: LIT) (FSE: OAY3) (OTCQX: LILIF), is pleased to announce the results of the first Mineral Resource estimate for the Rincon West lithium brine project in Salta Province, Argentina.

MRE Highlights (see Tables 1 and 2 for details):

• Measured and Indicated Resources of 0.15 km³ brine volume with an average grade of 296 mg/lithium, representing 238,000 tonnes Lithium Carbonate Equivalent (LCE), and
• Inferred Resource of 0.08 km³ brine volume with an average grade of 216 mg/l lithium, representing 64,000 tonnes LCE.

Nikolaos Cacos, CEO commented, “This initial resource marks a pivotal step in unlocking the full potential of Rincon West and reinforces Argentina Lithium’s position at the center of one of the most strategic lithium districts in the world. With Rio Tinto’s world-class Rincon Project as our direct neighbour and a strong offtake partnership with Stellantis, we are uniquely positioned to advance Rincon West rapidly and responsibly. This foundation allows us to leverage both, strategic infrastructure and commercial synergies, as we move toward the next phase of development.

As we advance PEA studies and evaluate advanced extraction technologies, our long-term focus remains crystal clear: to build a scalable, high-value lithium operation that generates sustainable returns for our shareholders. This initial resource provides a solid foundation on which we intend to expand the resource base: the exploration team will be carefully evaluating drilling below the current mineral resource, where expansion potential has been identified as the current mineral resource is open to depth. Together with our other highly prospective properties at Pocitos, Antofalla and Incahuasi, our company’s assets create a strong growth pipeline that will allow us to deepen strategic partnerships and accelerate development, potentially positioning Argentina Lithium as a key future supplier to the global EV and battery markets.” 

The Mineral Resource estimate was completed at the West Block properties (mining concessions Villanoveño II and Rinconcita II) totalling 2,931 hectares. The resource estimate does not consider the Paso de Sico concessions in the northern part of the Rincon West project, which in aggregate represents 3742.9 hectares of mining concessions at the Rincon Salar. The resource  was defined by 14 exploration boreholes  totalling 4823.2 metres of diamond drilling, and one production well of 470 metres of total length.

Table 1 presents the Project’s mineral resources, volumes and grades by resource category for lithium and potassium. Table 2 shows the Project’s mineral resources expressed as Lithium Carbonate Equivalent (LCE) and Potassium Chloride (KCl).

Table 1. Lithium and Potassium Mineral Resources at the Rincon West Project

Notes to the resource estimate (Table 1):

1. CIM definitions were followed for Mineral Resources.
2. The Qualified Person for this Mineral Resource estimate is Frederik Reidel, CPG.
3. No cut-off values have been applied to the resource estimate.
4. Numbers may not sum exactly due to rounding.

Table 2. Lithium Carbonate Equivalent (LCE) and Potassium Chloride (KCl) Mineral Resources

Notes to Table 2

1. Lithium is converted to lithium carbonate (Li₂CO₃) with a conversion factor of 5.32.
2. Potassium is converted to potassium chloride with a conversion factor of 1.91.
3. Numbers may not sum exactly due to rounding.

The effective date of the Mineral Resource estimate is September 26, 2025. Supporting information for the Mineral Resource estimate will be detailed in an independent technical report prepared in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects which will be filed on SEDAR+ under the Company’s profile within 45 days of the date of this news release.

Resource Estimation Methodology

Between 2022 and the end of 2024, Argentina Lithium conducted two drilling campaigns at the Rincon West Project during which 14 diamond drill exploration holes were completed.  Drilling was carried out by Salta-based AGV Falcon Drilling SRL, under the supervision of Argentina Lithium’s geologists.   Continuous “core” samples and unaltered formation test samples were collected at specific depth intervals for porosity studies.

Depth representative brine samples were extracted, typically by using a packer system. In some boreholes bailer and HydraSleeve sampling methodologies were applied.

On completion of drilling the boreholes were prepared as monitoring wells with the installation of 2-inch diameter blank or slotted PVC casings. At the conclusion of the second drilling campaign, one production well (RW-RT-1) was drilled using a mud-rotary system and completed with 10-inch diameter stainless steel production casing.  A variable rate pumping test and a 30-day constant rate pumping test were carried on this production well.

The brine resource estimate was determined by defining the aquifer geometry, the drainable porosity or specific yield (Sy) of the hydrogeological units in the Salar, and the concentration of the elements of economic interest, mainly lithium and potassium. Brine resources were defined as the product of the first three parameters. The resource estimate is limited to the Villanoveño II and Rinconcita II mining concessions in the Rincon Salar.

The resource model domain is constrained by the following factors:

• Upper Boundary: The upper boundary of the model is determined by the highest elevation samples within the dataset, and/or the phreatic brine level.
• Lateral Extent: The lateral extent of the resource model is confined within the boundaries of the LIT mining claims.
• Lower Boundary: The lower boundary of the model domain extends to 385 metres below the topography, which is 5 metres below the deepest sample. At this depth, geological evidence supports the continuation of brine with similar characteristics.

The specific yield values used to develop the resources are based on results  of drainable porosity analyses carried out on 310 undisturbed samples from HQ core by Daniel B. Stephens and Associates laboratory.

Cautionary Statement Regarding Mineral Resources

The mineral resources disclosed in this press release conform to NI 43-101 standards and guidelines and were prepared by an independent qualified person. The above-mentioned mineral resources are not mineral reserves as they do not have demonstrated economic viability. The quantity and grade of the reported Inferred Mineral Resources are conceptual in nature and are estimated based on limited geological and hydrogeological evidence and sampling. Existing data are sufficient to imply but not verify mineral grade and/or quality of continuity. An Inferred Mineral Resource has a lower level of confidence relative to a Measured or Indicated Mineral Resource and constitutes an insufficient level of confidence to allow conversion to a Mineral Reserve. It is reasonably expected, but not guaranteed, that the majority of Inferred Mineral Resources could be upgraded to Measured or Indicated Mineral Resources with additional drilling and pump tests. The National Instrument 43-101 Technical Report supporting the mineral resources for the Rincon West Project contained in this news release, will be filed on SEDAR+ by Argentina Lithium & Energy within 45 days of the date of this news release.

Stellantis Investment and Off-take

In September 2023, the Company entered into a definitive agreement with Stellantis, a leading global automaker, for a strategic investment through Stellantis’ subsidiary Peugeot Citroen Argentina S.A., in return for a 19.9% stake in Company’s Argentine subsidiary Argentina Litio y Energia S.A. (“ALE“), with Argentina Lithium retaining 80.1%. The agreement includes an Exchange Right allowing Stellantis to convert its ALE shares into up to 19.9% of Argentina Lithium’s common shares (undiluted), subject to certain conditions and a Top-Up Right to maintain that ownership threshold. Additionally, the parties executed a seven-year lithium offtake agreement, under which Stellantis will have the right to purchase up to 15,000 tonnes of lithium carbonate per year, if and once commercial production begins, with options for extension and rights of first refusal on surplus product.

Qualified Persons and QA/QC

The Mineral Resource Estimate and technical data in this news release were prepared under the direction of Frederik Reidel, CPG, of Atacama Water Consultants. Mr. Reidel is an independent Qualified Person as defined in NI 43-101. Mr. Reidel reviewed drill and brine sample collection, handling, and security practices for all drilling and sampling campaigns. All conform to industry best practice. The QP has reviewed and approved the technical content of this news release.

Drainable Porosity Analysis

319 undisturbed drill core samples obtained during 2022 – 2024 drilling campaigns were analyzed for drainable porosity by Daniel B. Stephens & Associates, Inc. in Albuquerque, New Mexico as primary laboratory, with additional control samples analyzed by Geo Systems Analysis, Inc. in Tucson, Arizona. Both DBSA and GSA are independent laboratories from LIT.

Brine Sample Analysis

Several brine sampling methods were employed to obtain depth-specific and representative samples for chemical analysis as follow:

• Brine samples were collected during diamond drilling at specific depth intervals using double or single packer systems, with occasional bailer sampling.
• Some samples were collected using HydraSleeve (RW-DDH-03) when technical issues prevented packer sampling during the drilling.
• Field parameters: pH, temperature (T), density, and electrical conductivity (EC), were measured at the wellhead for all samples.
• Brine samples were stored in 1-litre plastic bottles that were pre-washed and rinsed with the same brine to condition the container. After proper labelling and sealing, samples were transported to LIT’s Salta office and then shipped to the laboratory for chemical analysis under a strict chain of custody.
• Brine analysis results were uploaded to the project’s chemical database and periodically verified internally.

The quality of sample analytical results was controlled and assessed with a protocol of blank, duplicate and reference standard samples included within the sample sequence. Approximately 23% (75 of 322 samples) of all brine analyses were performed on control samples.

All brine samples were sent to the Alex Stewart NOA laboratory, which has extensive experience in analyzing lithium-rich brines and is accredited under ISO 9001, complying with ISO 17025 guidelines. The laboratory maintains internal QA/QC procedures with results reported in each assay certificate. Alex Stewart NOA laboratory is independent from LIT.

Inductively Coupled Plasma (ICP) spectrometry was used for chemical analysis of key elements including boron, calcium, potassium, lithium, and magnesium. Samples were diluted 100:1 prior to analysis.

The accuracy and consistency of the Alex Stewart NOA assays were assessed by the QP, facilitated by the aforementioned sample blanks, standards and duplicates. Good precision was observed, with a 10% error threshold for duplicate samples across all analytes. Only one sample pair exhibited an error slightly exceeding 10% for boron.

About Argentina Lithium

Argentina Lithium & Energy Corp is focused on acquiring high quality lithium projects in Argentina and advancing them towards production in order to meet the growing global demand from the battery sector. The strategic investment in the Company by Peugeot Citroen Argentina S.A., a subsidiary of Stellantis N.V., one of the world’s leading automakers, has helped Argentina Lithium to advance its four key projects covering over 67,000 hectares in the Lithium Triangle of Argentina. Management has a long history of success in the resource sector of Argentina and has assembled some of the most prospective lithium properties in the world-renowned “Lithium Triangle”. The Company is a member of the Grosso Group, a resource management group that has pioneered exploration in Argentina since 1993.