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Helius’ Transaction with Colossus on Serra Pelada Project Receives Colossus Shareholder Approval

Corporate Updates

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Helius’ Transaction with Colossus on Serra Pelada Project

Receives Colossus Shareholder Approval

Vancouver B.C., May 9 , 2025 - Helius Minerals Limited (“Helius” or the “Company”) (TSXV: HHH) is

pleased to announce that the shareholders of Colossus Minerals Inc . (“Colossus”) at the special

meeting of Colossus’ shareholders held on May 2, 2025 passed a special resolution approving the sale

to Helius of all of the shares (the “ Target Companies’ Shares ”) of Colossus Mineracao Ltda.

(“Colossus Brazil”) and Mineracao Fazenda Monte Belo Ltda. (“ MFM”, and together with Colossus

Brazil, the “Target Companies”), representing all or substantially all of the property of Colossus , and

thereby a 75% beneficial interest in the partnership called Serra Pelada – Companhia de

Desenvolvimento Mineral (“SPCDM”), which partnership holds a 100% interest in the Serra Pelada gold-

platinum-palladium mining project in Brazil (the “Serra Pelada Project”).

Colossus became insolvent in 2014 after dewatering measures at the Serra Pelada Project proved

inadequate in controlling water ingress. This created liquidity issues immediately before metal

production was to commence, which led to Colossus’ bankruptcy. The Serra Pelada Project was

thereafter put on a care and maintenance program and Colossus halted all exploration, construction

and development activities to conserve cash.

As announced in Helius’ news releases of March 4, 2025 and March 25, 2025 , Helius entered into a

definitive Exclusivity, Share Option and Acquisition Agreement dated March 3, 2025 (the “ Definitive

Agreement”) with Colossus which provides Helius with a twelve -month exclusivity period to conduct

financing (the “Financing”) to undertake: (a) a review and development of a plan to ensure compliance

with relevant mining laws and other regulatory requirements; (b) the formulation of a comprehensive

strategy to add ress outstanding debts, including those related to ongoing litigation, of the Target

Companies; and (c) the development of a detailed plan to rehabilitate the Serra Pelada Project, the

Target Companies and SPCDM (collectively, the “ Organizational Period Requirements ”), to allow

Helius to address certain regulatory and compliance matters to allow the Serra Pelada Project to move

forward.

As announced in Helius’ news release dated April 11, 2025 , Helius completed the Financing on April

10, 2025 by closing a non-brokered private placement of 4,300,000 common shares of the Company at

a price of Cdn$0.50 per share to raise gross proceeds of $2,150,000.

Upon Helius’ satisfaction of the Organizational Period Requirements, and upon receipt of conditional

approval from the TSX Venture Exchange, Helius could elect, in its sole discretion, to deliver notice (the

“Option Notice”) to Colossus of its decision to proceed with an irrevocable option (the “ Option”) to

purchase: (a) all of the shares of the Target Companies’ Shares; and (b) all of the intercorporate loans

and all interest accrued thereunder (the “ Intercompany Debt ”) owed by the Target Companies to

Colossus, if any. Upon Helius’ exercise of the Option within six months of the date of delivery of the

Option Notice, the parties would proceed with closing of Helius’ purchase of the Target Companies’

Shares and any Intercompany Debt.

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Helius is also pleased to announce that it has received approval from the holders of the existing senior

secured convertible notes issued by Colossus (the “Existing Notes”) in an aggregate principal amount

of US$4 million (the “ Existing Debt”) to exchange said Existing Notes for amended senior secured

convertible notes that Helius would issue to said noteholders in exchange for the Existing Debt.

In addition, Helius is also pleased to announce that Christian Grainger, Evan Jones, Brian Cole and

Samuel Clarke were elected to its board of directors at its annual general meeting of shareholders held

April 29, 2025. Samuel Clarke is a new director and his appointment is subject to TSX Venture approval.

Mr. Clarke has 20 years of mining executive experience , including roles as Finance Director or Chief

Financial Officer at various public mining companies, and he is a Chartered Accountant. Helius’ focus

will now shift to completing certain due diligence on the Serra Pelada Project to satisfy the Organizational

Period Requirements with a view to potentially exercising the Option to acquire the Target Companies’

Shares and any Intercompany Debt.

About Helius Minerals Limited

Helius is a mineral exploration company focused on the identification and exploration of high -quality

mineral assets across the Americas, with an emphasis on South American jurisdictions.

On Behalf of the Board of Directors of

Helius Minerals Limited

Christian Grainger (PhD, AIG) President and

CEO

M: +57 3146364676

[email protected]

Website: www.heliusminerals.com

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term in defined in the policies of the

TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.

CAUTIONARY NOTE REGARDING FORWARD LOOKING STATEMENTS: This news release may contain

forward-looking information within the meaning of applicable securities laws (“forward -looking statements”).

Forward-looking statements are statements that are not historical facts and are generally, but not always, identified

by the words “expects,” “plans,” “anticipates,” “believes,” “intends,” “estimates,” ‘projects,” “potential” and similar

expressions, or that events or conditions “will,” “would,” “may,” “could” or “should” occur. Forward-looking

statements in this news release include, without limitation, statements regarding the acquisition in connection with

Serra Pelada Project and Target Companies and the future satisfaction of the Organizational Period Requirements

. These forward-looking statements are subject to a variety of risks and uncertainties which could cause actual

events or results to differ materially from those reflected in the forward -looking statements, including, without

limitation: the uncertainties inherent to current and future legal challenges that face the Serra Pelada Project and

the Target Companies; controls, regulations, and political or economic developments in Brazil; changes in national

and local government legislation in Canada and Brazil; the lack of certainty with respect to foreign legal systems,

which may not be immune from the influence of political pressure, corruption or other factors that are inconsistent

with the rule of law; the speculative nature of mineral exploration and development, including the risks of obtaining

and maintaining the validity and enforceability of the necessary licenses and permits and complying with the

permitting requirements of Brazil; fluctuations in the international currency markets and in the rates of exchange of

the currencies of Canada, the United States and Brazil; significant capital requirements; risks related to fluctuations

in metal prices; uncertainties related to raising sufficient financing to fund exploration work in a timely manner and

on acceptable terms; changes in planned work resulting from weather, logistical, technical or other factors; the

possibility that results of work will not fulfill expectations and realize the perceived potential of the Serra Pelada

Project; risk of accidents, equipment breakdowns and labour disputes or other unanticipated difficulties or

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interruptions; the possibility of cost overruns or unanticipated expenses in conducting work programs; the risk of

environmental contamination or damage resulting from Helius’ operations and other risks and uncertainties. Any

forward-looking statement speaks only as of the date it is made and, except as may be required by applicable

securities laws, the Company disclaims any intent or obligation to update any forward-looking statement, whether

as a result of new information, future events or results or otherwise.