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Sigma Lithium Responds to Inaccurate Media Reports; Categorically Affirms Phase 2 & 3 Expansion Plans Are Proceeding as Planned; Strategic Process Successfully Continues

Company Commentary

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SIGMA LITHIUM RESPONDS TO INACCURATE MEDIA

REPORTS; CATEGORICALLY AFFIRMS PHASE 2 & 3

EXPANSION PLANS ARE PROCEEDING AS PLANNED;

STRATEGIC PROCESS SUCCESSFULLY CONTINUES

HIGHLIGHTS

• Sigma Lithium vehemently denies inaccurate recent media reports that incorrectly

denominated as an “injunction” certain conditions established upon the approval by the

Brazilian Courts of the transfer of two Exploration Sub-Plots by RIX to Sigma Brazil.

• Sigma Lithium states as categorically incorrect recent media reports speculating that the

status or conditions attached to the transfer are impediments to the Company’s future

operations and its ability to conduct its Phase 2 & 3 expansion.

• The Brazilian Courts ruling just reinforced the Brazilian Mining Code, whereby both Sigma Brazil

and RIX have access ensured by rule of law to the Exploration Sub -Plots through a standard

“waste sharing agreement”.

o The two companies celebrated an irrevocably binding waste sharing agreement on

August 9, 2023.

• The Brazilian Courts authorized the transfer of the Exploration Sub-Plots by RIX without cost

to Sigma Brazil.

o Furthermore, the Brazilian Courts ruled that any undue loss to RIX can be resolved

through financial compensation amongst RIX shareholders.

o This compensation is an internal matter related to RIX and does not impact Sigma

Brazil nor Sigma Lithium.

•

SAO PAULO, BRAZIL – (Sept. 29 , 2023) – Sigma Lithium Corporation (“Sigma Lithium ” or the

“Company”) (NASDAQ: SGML, BVMF: S2GM34, TSXV: SGML) , a leading global lithium producer

dedicated to powering the next generation of electric vehicles with carbon neutral, socially and

environmentally sustainable chemical-grade lithium concentrate, categorically states that its Phase 2

& 3 expansion plans are proceeding as planned.

Sigma Lithium vehemently denies inaccurate recent media reports that incorrectly denominated as

an “injunction” certain conditions established upon the approval by the Brazilian Courts of the transfer

by RIX Mineração S.A. (“RIX”) to Sigma Brazil of two sub-divisions of an exploration permit

(“Exploration Sub-Plots”).

The Brazilian Courts authorized the transfer of the Exploration Sub-Plots by RIX without cost to

Sigma Brazil or Sigma Lithium.

• Furthermore, the Brazilian Courts ruled that any undue loss to RIX can be resolved through

financial compensation amongst RIX shareholders.

• This compensation is an internal matter related to RIX and does not impact Sigma Brazil or

Sigma Lithium.

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Sigma Lithium states as categorically incorrect recent media reports speculating that the status or

conditions attached to the transfer are impediments to the Company’s future operations and its ability

to conduct its Phase 2 & 3 expansion.

Sigma Lithium believes the decision by the courts approving the transfer of the Exploration Sub-Plots

by RIX with certain conditions was fair. The conditions are in line with the provisions within the

Brazilian Mining Law. RIX did not appeal the Brazilian Courts decision.

Both Sigma Brazil and RIX access to the small areas represented by the two Exploration Sub-Plots is

regulated by the Brazilian Mining Law through a standard “waste sharing agreement”.

• The two companies celebrated an irrevocably binding waste sharing agreement on August

9, 2023 ensuring access of both companies to the areas.

• Sigma Brazil is authorized to remove waste from the Exploration Sub-Plots in question, when

opening its Phase 2 & 3 pits.

• In the event of Sigma Brazil encounters any mineral in the Exploration Sub-Plots, it shall place

in a nearby location determined by RIX for its future use.

Paula Lacava, Sigma Lithium Chief Legal Counsel stated “Approving the transfer with conditions was

a wise decision by the Brazilian Courts, ruling in line with the Brazilian Mining Law: Not only validated

the transfer, but also solved the matter of whether the Exploration Sub-Plots might contain

economically mineable ore”.

The conditions established by the Courts allow Sigma Brazil to remove waste and ground within the

areas of the Exploration Sub-Plots, as planned, in line with the standard “waste sharing agreement”

signed. The conditions just reinforced the regulations in the Brazilian Mining Code:

(i) Sigma Brazil is just prevented from sub-leasing the “Exploration Sub-Plots” to a third

party and/or;

(ii) Profiting from the sale of mineral ore located in the “Exploration Sub-Plots”.

Therefore, these conditions are not material nor impact Sigma Lithium´s business or Sigma

Brazil´s operations.

The Exploration Sub-Plots do not contain any mineral reserves. The surface farms over the

Exploration Sub-Plots are held by private Brazilian land corporations, Miazga and Arqueana, both also

related parties, 51% controlled by Ana Cabral.

Hence the decision by the Brazilian Courts was not appealed by RIX or by Calvyn Gardner, a minority

shareholder of RIX.

Sigma Lithium continues its strategic review of proposals received from potential partners in various

industries globally.

Sigma Lithium’s Phase 2 & 3 mines are clear separate ore bodies from RIX’s deposits, as determined

by the vertical section at the border limit. Therefore, the mining activit ies of both Phase 2 & 3 are

ensured and regulated by rule of law (Mining Code and Federal Laws regulating the M ining Code),

including access guarantees.

RIX is a related party to Sigma Lithium. It is a Brazilian privately held holding corporation founded by

Ana Cabral in March 2009 and funded with her principal capital since inception. She controls 51% of

RIX and granted Calvyn Gardner 49% as an “earned free carry” for his work as an executive in the

Company.

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ABOUT SIGMA LITHIUM

Sigma Lithium (NASDAQ: SGML, BVMF: S2GM34, TSXV: SGML) is a leading global lithium producer

dedicated to powering the next generation of electric vehicle batteries with carbon neutral, socially

and environmentally sustainable chemical-grade lithium concentrate.

Sigma Lithium has been at the forefront of environmental and social sustainability i n the EV battery

materials supply chain for six years and it is currently producing Triple Zero Green Lithium from its

Grota do Cirilo Project in Brazil. Phase 1 of the project is expected to produce 270,000 tonnes of Triple

Zero Green Lithium annually (36,700 LCE annually). If it is determined to proceed after completion of

an ongoing feasibility study, Phase 2 & 3 of the project are expected to increase production to 766,000

tonnes annually (or 104,200 LCE annually). The project produces Triple Zero Green Lithium in its state-

of-the-art Greentech lithium plant that uses 100% renewable energy, 100% recycled water and 100%

dry-stacked tailings.

Please refer to the Company’s National Instrument 43 -101 technical report titled "Grota do Cirilo

Lithium Project Araçuaí and Itinga Regions, Minas Gerais, Brazil, Amended and Restated Technical

Report" issued June 12, 2023, which was prepared for Sigma Lithium by Homero Delboni Jr., MAusIMM,

Promon Engenharia; Marc -Antoine Laporte, P.Geo, SGS Canada Inc; Jarrett Qui nn, P.Eng., Primero

Group Americas; Porfirio Cabaleiro Rodriguez, (MEng), FAIG, GE21 Consultoria Mineral; and Noel

O'Brien, B.E., MBA, F AusIMM (the “Updated Technical Report”). The Updated Technical Report is filed

on SEDAR and is also available on the Company’s website.

For more information about Sigma Lithium, visit https://www.sigmalithiumresources.com/

FOR ADDITIONAL INFORMATION PLEASE CONTACT

Daniel Abdo, Chief Communications Officer

+55 11 2985-0089

[email protected]

Jamie Flegg, Chief Development Officer

+1 (647) 706-1087

[email protected]

Sigma Lithium

Sigma Lithium

@sigmalithium

@SigmaLithium

FORWARD-LOOKING STATEMENTS

This news release includes certain "forward -looking information" under applicable Canadian and U.S. securities

legislation, including but not limited to statements relating to timing and costs related to the general business and

operational outlook of the Company, the environmental footprint of tailings and positive ecosystem impact relating

thereto, donation and upcycling of tailings, timing and quantities relating to tailings and Green Lithium, achievements

and projections relating to the Zero Tailings st rategy, achievement of ramp -up volumes, production estimates and

the operational status of the Groto do Cirilo Project, and other forward -looking information. All statements that

address future plans, activities, events, estimates, expectations or developments that the Company believes, expects

or anticipates will or may occur is forward -looking information, including statements regarding the potential

development of mineral resources and mineral reserves which may or may not occur. Forward -looking information

contained herein is based on certain assumptions regarding, among other things: general economic and political

conditions; the stable and supportive legislative, regulatory and community environment in Brazil; demand for lithium,

including that such demand is supported by growth in the electric vehicle market; the Company’s market position and

future financial and operating performance; the Company’s estimates of mineral resources and mineral reserves,

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including whether mineral resources will ever be de veloped into mineral reserves; and the Company’s ability to

operate its mineral projects including that the Company will not experience any materials or equipment shortages,

any labour or service provider outages or delays or any technical issues . Although management believes that the

assumptions and expectations reflected in the forward -looking information are reasonable, there can be no

assurance that these assumptions and expectations will prove to be correct. Forward-looking information inherently

involves and is subject to risks and uncertainties, including but not limited to that the market prices for lithium may

not remain at current levels; and the market for electric vehicles and other large format batteries currently has limited

market share and no assurances can be given for the rate at which this market will develop, if at all, which could affect

the success of the Company and its ability to develop lithium operations. There can be no assurance that such

statements will prove to be accurate, as actual results and future events could differ materially from those anticipated

in such statements. Accordingly, readers should not place undue reliance on forward -looking information. The

Company disclaims any intention or obligation to update or revise any forward-looking information, whether because

of new information, future events or otherwise, except as required by law. For more information on the risks,

uncertainties and assumptions that could cause our actual results to differ from current expectation s, please refer

to the current annual information form of the Company and other public filings available under the Company’s profile

at www.sedar.com.

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 news release.