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Sigma Lithium Resources to Trade Under New NAME, Consolidates Shares 10:1 and Appoints CFO

Management Changes Corporate Actions

SIGMA LITHIUM RESOURCES TO TRADE UNDER NEW NAME, CONSOLIDATES SHARES 10:1 AND APPOINTS

CFO

June 2 1, 2018 – Vancouver, British Columbia – Sigma Lithium Resources Corporation (“ Sigma” or the

“Company”) (TSXV: SGMA) is pleased to announce its common shares will commence trading on the TSX

Venture Exchange under its new name “Sigma Lithium Resources Corporation” at the market open on June 22

following a 10:1 consolidation of its outstanding shares. Sigma’s shares will continue to trade under the existing

symbol “SGMA”. Sigma was formerly named Margaux Red Capital Inc.

The share consolidation and the name change were approved at Sigma’s annual general and special meeting

held on June 18, 2018. As a result of the share consolidation, Sigma now has 66,967,501 co mmon shares

outstanding.

Sigma is also pleased to announce the appointment of Guilherme Guimaraes to Chief Financial Officer. Mr.

Guimaraes was previously CFO for all Brazilian mining activities at Denham Capital Management LP, a U .S.

private equity fund backed by Bill Gates and Harvard University. He has more than 25 years of experience in

finance and accounting, with a key focus on mining companies. He has also worked with investees of Brookfield

Asset Management, a leading Canadian investor , and starte d his career in 1990 at the Brazilian Stock

Exchange and then in auditing at Arthur Andersen in 1994.

“We are thrilled to bring Guilherme on board. He has had significant experience in working with Denham backed

by Gates and Harvard, two of the world’s mo st respected ESG investors in natural resources and energy

sectors. He has also worked with Brookfield, a leading Canadian investor with significant experience in Brazil.

His appointment says much about the high -caliber talent that we are able to attract t o lead Sigma toward

becoming a leading global lithium company built on strong Environmental, Social and Corporate Governance

(ESG) principles,” says Sigma Lithium Resources CEO Calvyn Gardner.

This comes as Sigma’s wholly -owned Brazilian subsidiary , Sigma Mineracao, is on track to complete

construction and initiate the installation of its pilot production plant in the next month. The pilot plant will have

capacity to produce up to 12,000 tonnes of lithium spodumene concentrate per year at the rate of 10 to nnes per

hour in order to ship spodumene concentrate for prospective customers. Prior to starting construction on the

pilot plant, Sigma conducted successful tests for eight months, producing high -quality battery -grade lithium

spodumene concentrate above 6% Li2O at SGS laboratories in Brazil and Canada.

In addition Sigma is currently undergoing a drilling campaign of 30,000m to further validate its significant

resource base in accordance with National Instrument 43-101 (“NI 43-101”) guidelines.

Registered holders of Sigma shares were mailed letters of transmittal on June 18, 2018 requesting them to

forward their Sigma share certificates to Sigma’s transfer agent, Computershare Trust Company of Canada

(“Computershare”), in exchange for new certifi cates representing the number of post -consolidation Sigma

shares held by them and reflecting the name change.

No action is required in respect of Sigma shares held through Canadian investment dealers and other

participants in the Canadian Depository for Securities. If a registered shareholder did not receive a letter of

transmittal, please contact Computershare at the contact information below.

In addition, at the June 18 shareholders’ meeting, Ana Cabral -Gardner and Frederico Marques were elected as

additional directors of the Company. Ms. Cabral is a Managing Partner at A10 Investimentos, a private equity

and asset management firm. Mr. Marques is a partner and foreign legal consultant at McCarthy Tétrault LLP, a

full-service Canadian law firm. Jo-Anne Archibald, a former Senior Vice President at TMX Equicom , has been

appointed as the Company’s Secretary.

ABOUT SIGMA

Sigma is advancing to pilot -production stage at its lithium projec t in Minas Gerais, Brazil. The C ompany is

backed by some of the largest ESG focused institutional investors in the world . It plans to build a world -class

commercial-scale lithium concentration plant in 2019 , with the goal of becoming a fully -operational sustainable

lithium producer in 2020. Sigma will produce battery -grade sp odumene concentrate from its high -quality

deposits, supplying the lithium -ion battery industry worldwide. Sigma’s objective is to execute its strategy while

embracing environmental, social, and governance principles.

Sigma, through its subsidiaries, has 2 8 mineral rights in four properties spread over 188 km2 and 18,887

hectares - with over 200 lithium bearing pegmatites and 11 former historical lithium mines. The Grota do Cirilo

property, Sigma’s primary focus, includes 10 mining concessions (mining produ ction authorizations).

Sigma has a NI 43-101 technical report on the Grota do Cicilo property prepared by SGS Canada -Geostat

(“SGS”), which includes estimated measured and indicated resources of approximately 12,900,000 tonnes for its

main deposit (8,502, 000t measured and 4,385,000t indicated), with a high average grade of 1.56% (for

approximately 500,000t of LCE). The technical report also includes estimated inferred resources of 608,348t

and further notes the potential for significant resource expansion.

Qualified Person

The resources estimates in this news release are included in (and the estimated LCE is derived from the

resource estimates included in) the technical report titled “Technical Report Northern and Southern Complexes

Project, Araçuai and Itinga, Brazil, Sigma Lithium Resources Inc.” which has an effective date of January 29,

2018 and was prepared by Marc -Antoine Laporte, P.Geo, M.Sc. of SGS. Mr. Laporte is a qualified person as

defined by NI 43-101 and is independent of Sigma. The report is available at www.sedar.com.

For additional information please contact:

Sigma Lithium Resources Corporation / www.sigmalithiumresources.com

Ana Cabral

Director of Business Development and

Investor Relations

55 11 2985 -0089

[email protected]

OR

Gabriela Forlin

PRC Consulting Brasil

55 11 3078 -4461

[email protected]

For inquiries related to letters of transmittal to receive a new share certificate please contact:

Computershare Trust Company of Canada

100 University Avenue

8th Floor

Toronto, ON M5J 2Y1

Attn: Corporate Actions

Telephone: 1-800-564-6253

Email: [email protected]

READER ADVISORIES

This news release contains forward -looking statements relating to the objectives of the Company, concentration

plant construction, achieving sustainable production, continuing superior product quality, metal recovery and

other statements that are not historical facts. Readers are cautioned not to place undue reliance on forward -

looking statements, as there can be no ass urance that the plans, intentions or expectations upon which they are

based will occur. By their nature, forward -looking statements involve numerous assumptions, known and

unknown risks and uncertainties, both general and specific, that contribute to the p ossibility that the predictions,

forecasts, projections and other forward -looking statements will not occur, which may cause actual performance

and results in future periods to differ materially from any estimates or projections of future performance or

results expressed or implied by such forward -looking statements. These assumptions, risks and uncertainties

include, among other things: the state of the economy in general and capital markets in particular , and investor

interest in the business and future prospects of Sigma.

The forward-looking statements contained in this news release are made as of the date of this news release.

Except as required by law, Sigma disclaims any intention and assumes no obligation to update or revise any

forward-looking statements, whether as a result of new information, future events or otherwise, except as

required by applicable securities law. Additionally, Sigma undertakes no obligation to comment on the

expectations of, or statements made, by third parties in respect of the matters discussed above.

The key risks and uncertainties that could cause actual results or the material factors and assumptions applied

in preparing forward-looking information to differ materially from predictions, forecasts, projections, expect ations

or conclusions are discussed in the “Risk Factors” section of Sigma’s Filing Statement dated April 25, 2018. We

caution that the foregoing list is not exhaustive of all possible factors.

For more information on the risks, uncertainties and assumpt ions that could cause our actual results to differ

from current expectations, please refer to our public filings available 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.