Due Diligence Concluded / Commencement of Definitive Agreement

Lithium South Development Corporation (the "Company" or "Lithium South") (TSX-V: LIS) (OTCQB: LISMF) (Frankfurt: OGPQ) ) is providing an update to its news release of July 30, 2025 and August 7, 2025 regarding the sale of the Hombre Muerto North Lithium Project property package to POSCO Argentina SAU, which is the 100-per-cent owned Argentine subsidiary of POSCO Holdings Inc. ("POSCO'), referred to as the Transaction.

Due Diligence by POSCO Argentina S.A.U.  has now been substantially completed with several minor items remaining outstanding. The parties are now moving forward with the negotiation of the Definitive Agreement. Matters under review prior to the completion of the Transaction include closing costs, legal and accounting costs and potential tax considerations.

The Company expects to complete this process within the time frame previously announced on August 7, 2025 . Once the Definitive Agreement is complete, the Company will provide details about our Annual General and Special Meeting date as well as provide further details on the issuer bid to purchase up to all of the issued and outstanding securities of the Company.

About Lithium South Development Corp.

Lithium South owns 100% of the HMN Li Project located in Salta and Catamarca Provinces, Argentina , in the heart of the lithium triangle. The Salar del Hombre Muerto has a history of lithium production, with Rio Tinto Lithium (Formerly Arcadium Lithium and recently purchased by Rio Tinto Corporation for US$6.7 billion in March 2025 ) in operation to the south of the HMN Li Project for over twenty-five years.  The HMN Li Project is adjacent to the east with a U.S. billion-dollar lithium development by POSCO Argentina S.A.U., now in lithium production. Exploration work to date has delineated a NI 43-101 compliant 1,583,200 tonne Lithium Carbonate Equivalent ("LCE") Resource at an average grade of 736 milligrams per liter lithium (mg/L Li ) , with 1,463,000 tonnes in the measured category  and 120,000 tonnes in the indicated category, at a cutoff grade of 500 mg/l Li (Note 1 below) on the Alba Sabrina, Natalia Maria , and Tramo claim blocks, three of five non-contiguous blocks that make up the HMN Li Project (View Report: www.lithiumsouth.com/wp-content/uploads/2023-technical-report-NI43-101.pdf ). A recent Preliminary Economic Assessment (Note 2 below) April 30, 2024 , delineates potential to develop a 15,600 tonne per year lithium carbonate project.  LIS is now moving the project forward to a Feasibility Study.

On behalf of the Board of Directors

Adrian F. C. Hobkirk
President and Chief Executive Officer
Investors / Shareholders call 855-415-8100 / website: www.lithiumsouth.com

The contents of this press release and the scientific information contained herein were reviewed by Mr. William Feyerabend , CPG, a Consulting Geologist and a Qualified Person under N.I. 43-101. Mr. Feyerabend participated in the writing of this press release and approves the content.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release. The TSX Venture Exchange has not reviewed the content of this news release and therefore does not accept responsibility or liability for the adequacy or accuracy of the contents of this news release.

Note 1: A report titled, Updated Mineral Resource Estimate – Hombre Muerto North Project, NI 43-101 Technical Report Catamarca and Salta, Argentina , Mark King, PhD, PGeo, Peter Ehren , M.Sc, MAusIMM, September 5th, 2023 .

Note 2: The report titled, N.I. 43-101 Preliminary Economic Assessment Hombre Muerto North Lithium Project, Salta, Argentina , was completed by Knight Piesold Consulting and JDS Energy and Mining Inc., and on SEDAR April 30, 2024

This news release contains certain "forward-looking statements" within the meaning of Section 21E of the United States Securities and Exchange Act of 1934, as amended. Except for statements of historical fact relating to the Company, certain information contained herein constitutes forward-looking statements. Forward-looking statements are based upon opinions and estimates of management at the date the statements are made and are subject to a variety of risks and uncertainties and other factors which could cause actual results to differ materially from those projected in the forward-looking statements.  The reader is cautioned not to place undue reliance on forward- looking statements.  We seek safe harbor.

Logo : https://mma.prnewswire.com/media/2778675/Lithium_South_Development_Corporation_Logo.jpg

Cision View original content to download multimedia: https://www.prnewswire.com/news-releases/due-diligence-concluded--commencement-of-definitive-agreement-302563132.html

SOURCE Lithium South Development Corporation

Cision View original content to download multimedia: http://www.newswire.ca/en/releases/archive/September2025/22/c4060.html

News Provided by Canada Newswire via QuoteMedia

LIS:CC
The Conversation (0)
Argentina Lithium & Energy IR Manager Shawn Perger.

Argentina Lithium and Energy: PFS at Rincon West Targeted in 2027

Argentina Lithium and Energy (TSXV:LIT,OTCQB:LILIF,FWB:OAY3) IR Manager Shawn Perger spoke to the Investing News Network at the New Orleans Investment Conference, highlighting the expected completion of a prefeasibility study (PFS) for Rincon West in Q2 2027 and a production pathway to follow.... Keep Reading...
Rio Tinto website.

Rio Tinto Opens Two Argentine Lithium Projects Worth US$1.4 Billion

Rio Tinto (ASX:RIO,NYSE:RIO,LSE:RIO) opened two lithium operations in Argentina's Catamarca province on Thursday (October 29), which is touted to add 25,000 metric tons of annual lithium carbonate equivalent (LCE) capacity once fully ramped up.To date, Rio Tinto has invested roughly US$1.4... Keep Reading...
Silver batteries surround a rising green graph on a lithium-themed backdrop with the text: Lithium, Li.

Benchmark: New Lithium Mine Needed Every Two Months to Meet 2050 Demand

The lithium industry will need to bring the equivalent of a new mine into production roughly every two months for the next 24 years to keep up with demand, according to new data from Benchmark Mineral Intelligence.Benchmark forecasts global lithium demand will reach about 7 million metric tons... Keep Reading...
Blue battery with Australian flag design on a wooden surface.

5 Best-performing ASX Lithium Stocks in 2026

After a sharp rally in the first half of the year, lithium prices retreated during the third quarter, surrendering a significant portion of the gains generated in May when carbonate values reached a multi-year high. Data from Benchmark Mineral Intelligence shows FOB Australia spodumene... Keep Reading...
Glowing battery symbol with lightning bolt on purple circuit board.

Lithium Market Trends: Q3 2026 Review and Forecast

Lithium prices lost ground in Q3, giving back much of the momentum built during a sharp first-half rally.The decline came despite demand indicators that market watchers continue to describe as strong, with electric vehicles (EVs) and grid-scale energy storage both pulling on supply. Price action... Keep Reading...
An electric vehicle beside a charging station.

EU Hybrid EV Cap Sinks Chinese Lithium to 10 Month Low

The EU announced it will cap imports of Chinese hybrid electric vehicles at 350,000 units annually starting this December, sending Chinese lithium futures plunging to a 10 month low.European Trade Commissioner Maros Sefcovic brokered the quota system during recent negotiations held in Beijing.... Keep Reading...

Interactive Chart

Latest Press Releases

Related News