NOA Lithium Announces Completion of Mobilization and Start of 2026 Exploration Drilling Program At Rio Grande Project

NOA Lithium Announces Completion of Mobilization and Start of 2026

Exploration Drilling Program At Rio Grande Project

May 21, 2026, Buenos Aires, Argentina – NOA Lithium Brines Inc. (TSXV:NOAL | Frankfurt:N7N)

(“NOA” or the “Company”) is pleased to announce that, further to its press release dated April 23,

2026, the Company’s drilling contractor, Hidrotec S.A., has completed mobilization of two drilling rigs

for NOA’s 2026 exploration drilling campaign at its flagship Rio Grande Project (the “ Project”) in

Salta Province, Argentina. Site preparation activities, including construction of well pads, have been

completed, and drilling is expected to commence early next week.

These exploration activities form part of NOA’s work program as it advances the Project toward

completion of a Preliminary Feasibility Study (“PFS”) by year-end 2026.

NOA’s Chief Executive Officer , Gabriel Rubacha states: “With mobilization complete and drilling

expected to begin shortly, we are entering an important phase of fieldwork at Rio Grande as we

advance toward the PFS. This program is designed to further de-risk the Project through additional

hydrogeological data a nd testing, and it complements the process development and engineering

work currently underway with Hatch. Together, these activities are intended to support a robust PFS

design basis and development pathway.”

In this initial exploration campaign, the Company plans to drill exploratory wells near diamond drill

holes DDH-RG23-001 (Sulfa X) and DDH -RG23-004 (El Camino II). The program is designed to

evaluate the hydraulic parameters of deep brine-bearing aquifers and to support ongoing refinement

of the hydrogeological and res ource models, as the Project progresses toward more advanced

technical and economic studies.

This exploration drill program has been reviewed and approved by Montgomery & Associates, which

is currently preparing the water balance of the project and will participate in the preparation of the

PFS of the Project.

About NOA Lithium Brines Inc.

NOA is a lithium exploration and development company formed to acquire assets with significant

resource potential. All NOA’s projects are located in the heart of the prolific Lithium Triangle, in the

mining-friendly province of Salta, Argentina, near a mul titude of projects and operations owned by

some of the largest players in the lithium industry. NOA has rapidly consolidated one of the largest

lithium brine claim portfolios in this region that is not owned by a producing company, with key

positions on three prospective salars, being Rio Grande, Arizaro, and Salinas Grandes, and totalling

over 140,000 hectares.

About Montgomery & Associates

NEWS RELEASE

Montgomery & Associates (“M&A”) is an international water resource consulting firm that specializes

in management and mining hydrogeology services which includes characterization of aquifer

conditions. It has been operating since 1984, with South American offices now located in Santia go

Chile and Salta Argentina. M&A’s Head office is in Tucson Arizona. M&A’s client list includes most

of the domestic and international mining entities operating in the Americas.

On Behalf of the Board of Directors,

Gabriel Rubacha

Chief Executive Officer and Director

For Further Information

Website: www.noalithium.com

Email: [email protected]

Telephone: +54-9-11-5060-4709

Alternative Telephone: +1-403-571-8013

Qualified Person

Mr. Michael Rosko, M.Sc., C.P.G. of E. L. Montgomery and Associates (“ M&A”) is a Registered

Geologist (C.P.G.) in Arizona, California, and Texas, a Registered Member of the Society for Mining,

Metallurgy and Exploration, and is a Qualified Person ( “QP”) as defined by NI 43 -101. Mr. Rosko

and hydrogeologists from M&A have been on site multiple times during the various phases of drilling

and sampling operations and Mr. Rosko has extensive experience in salar environments and has

been a QP on many lithium brine projects. Mr. Rosko and M&A are completely independent of NOA,

as defined in, and required by, NI 43-101 and Mr. Rosko has reviewed and approved the content of

this news release.

Cautionary Note Regarding Forward-Looking Statements

This news release contains forward-looking statements and other statements that are not historical

facts. Forward -looking statements are often identified by terms such as “will”, “may”, “should”,

“anticipate”, “expects” and similar expressions. All stateme nts other than statements of historical

fact, included in this news release are forward -looking statements that involve risks and

uncertainties. There can be no assurance that such statements will prove to be accurate and actual

results and future events could differ materially from those anticipated in such statements. Important

factors that could cause actual results to differ materially from the Company’s expectations include

the results of exploration drilling, further brine process testing and exploration and other risks detailed

from time to time in the filings made by the Company with securities regulators. The reader is

cautioned that assumptions used in the preparation of any forward-looking information may prove to

be incorrect. Events or circumsta nces may cause actual results to differ materially from those

predicted, as a result of numerous known and unknown risks, uncertainties, and other factors, many

of which are beyond the control of the Company. The reader is cautioned not to place undue reliance

on any forward -looking information. Such information, although considered reasonable by

management at the time of preparation, may prove to be incorrect and actual results may differ

materially from those anticipated. Forward -looking statements contai ned in this news release are

expressly qualified by this cautionary statement. The forward -looking statements contained in this

news release are made as of the date of this news release and the Company will update or revise

publicly any of the included forward-looking statements as expressly required by applicable law.

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined

in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy

of this release. No securities regulatory authority has reviewed nor accepts responsibility for

the adequacy or accuracy of the content of this news release.