Helius Minerals Executes Amending Agreement for the Serra Pelada Gold-PGM Project

VANCOUVER, BC, Oct. 23, 2025 /CNW/ - Helius Minerals Limited ("Helius" or the "Company") (TSXV: HHH) is pleased to announce that it has executed an amending agreement dated October 22, 2025 (the "Amending Agreement") with Colossus Minerals Inc. ("Colossus") to modify certain terms of the Exclusivity, Share Option and Acquisition Agreement dated March 3, 2025 (the "Definitive Agreement") concerning the proposed acquisition (the "Acquisition") by Helius of a 75% beneficial interest in the Serra Pelada Gold-PGM Project in Brazil (the "Serra Pelada Project").

The amendments are expected to provide several key benefits to Helius Minerals, including:

• Regulatory Flexibility: Enables Helius to obtain TSX Venture Exchange ("TSXV") and other key regulatory and stakeholder approvals at or prior to closing, rather than at the time of delivering the Option Notice (as defined below).
• Extended Timelines: Permits an additional 30 business days to secure required approvals, with the potential for further extensions by mutual consent.
• Reduced Transaction Risk: Defers the issuance of Special Warrants to Colossus until closing, aligning share issuance with successful satisfaction of conditions precedent.
• Clearer Path to Completion: Introduces additional closing conditions such as creditor and regulatory approval of the debt and rehabilitation plans designed to facilitate the structured advancement of the acquisition and restart of the Serra Pelada Project.
• Enhanced Project Optionality: Allows the progression of technical, legal, and commercial workstreams in parallel with stakeholder engagement, minimizing transaction delays and uncertainty.

Together, these changes provide Helius with the flexibility, time, and structure necessary to complete due diligence, secure approvals, and advance the Serra Pelada Project toward redevelopment.

Dr. Chris Grainger, President and CEO of Helius Minerals, commented:

"As we continue to de-risk the Serra Pelada project, we have advanced a strong framework of understanding with both the Ministry of Mines and the National Mining Agency that supports our pathway to return Serra Pelada to good standing. At the same time, we have deepened our partnership with COOMIGASP and re-engaged Integrato, a firm with long-standing experience in the community, to ensure that local stakeholders are active participants in this new chapter for Serra Pelada.

From a technical standpoint, our team has successfully reintegrated and modernized the historical drilling and development database, allowing us to reinterpret the geological model and evaluate a range of mining scenarios that reflect current market conditions. Importantly, we are preparing an initial NI 43-101 Technical Report that, while non-resource in nature, will give the market and our stakeholders a clear foundation for understanding both the geological opportunity and the risks associated with Serra Pelada. By carving out legacy issues and setting transparent baselines, this work will allow us to move forward with confidence and credibility.

Given the pace of progress, we expect to complete due diligence before the end of the year, well within the prescribed time frame. That milestone will allow us to turn our focus toward remedying license matters, engaging creditors systematically, and mitigating key risks so that we are in a strong position to exercise the option, close, and advance the redevelopment of Serra Pelada."

Under the Definitive Agreement, Helius was provided with a twelve-month exclusivity period (the "Organizational Period") to, among other things: (a) negotiate and develop a plan satisfactory to Helius to resolve the outstanding debts of the Brazilian Subsidiaries (as defined below) and Companhia de Desenvolvimento Mineral ("SPCDM") (the "Debt Plan"); and (b) develop a plan satisfactory to Helius to rehabilitate the Serra Pelada Project, the Brazilian Subsidiaries (as defined below) and SPCDM (the "Rehabilitation Plan").

If Helius completes its Organizational Period due diligence on the Serra Pelada Project, it may then elect to deliver written notice to Colossus (the "Option Notice") triggering the grant to Helius of an option (the "Option") to acquire: (a) all of the shares in the Brazilian subsidiaries of Colossus (the "Brazilian Subsidiaries") and thereby a 75% beneficial interest in SPCDM, which holds a 100% interest in the Serra Pelada Project; and (b) all of the intercorporate loans (and all interest accrued thereunder) owed by the Brazilian Subsidiaries to Colossus. The Definitive Agreement required Helius to have obtained TSXV approval ("TSXV Approval") of the transaction, as well as to issue special warrants to Colossus (the "Special Warrants"), at the time of delivery of the Option Notice to Colossus.

Amending Agreement 

The Amending Agreement, among other things, provides Helius with the flexibility to secure TSXV Approval and other key regulatory and stakeholder approvals (collectively, the "Regulatory Approvals") including from the Cooperativa de Mineração dos Garimpeiros de Serra Pelada ("COOMIGASP"), the Brazilian Ministry of Mines and Energy ("MME") and the National Mining Agency ("ANM"), as conditions to the closing of the Acquisition. The Amending Agreement also allows for Helius to extend the 6 month Option period (the "Option Period"), following the delivery of the Option Notice, by an additional 30 business days to provide additional time to obtain the Regulatory Approvals necessary for closing, provided that none of the Regulatory Approvals have been denied on a non-appealable decision of a governmental authority at such time, and provided that Helius is not in breach of its obligations to seek and obtain such Regulatory Approvals. The Amending Agreement permits Helius to seek additional extensions of the Option Period with the prior written consent of Colossus, such written approval not to be unreasonably withheld, on the same basis as securing the first extension.  The Amending Agreement also delays the issuance of the Special Warrants to Colossus until closing of the Acquisition and sets out additional closing conditions, including securing creditor approval to the Debt Plan and obtaining regulatory approval to the Rehabilitation Plan. These amendments are designed to facilitate the completion of the acquisition transaction and advancement of the Serra Pelada Project. 

The Serra Pelada Gold-PGM Project

Serra Pelada is located within the Carajás Mineral Province of Brazil. In July 2007, COOMIGASP entered into a partnership agreement with Colossus Mineração Ltda. ("Colossus Brazil") to form SPCDM, which holds a 100% interest in the Serra Pelada Project. Colossus Brazil holds a 75% interest in SPCDM under the Partnership Agreement.

In 2014, Colossus became insolvent prior to achieving commercial production due to inadequate dewatering measures. This created liquidity and credibility issues immediately before metal production was to commence. The Serra Pelada Project was thereafter put on a care and maintenance program, and Colossus reported that it suspended operations due to liquidity challenges in 2014.

Helius has actioned the following key items to advance its Organizational Period due diligence on the Serra Pelada Project:

Advancing Key Workstreams

Following execution of the Definitive Agreement, Helius has undertaken and made material progress in advancing its systematic review of the Serra Pelada Project to identify and address key technical, regulatory, legal and commercial risks as part of its due diligence process, including:

Strategic Plan for Serra Pelada

Helius has developed and will present a Strategic Plan for Serra Pelada that prioritizes three core objectives:

• Restoring the project to good standing with Brazilian regulatory authorities;
• Addressing and restructuring legacy creditor obligations in a pragmatic and transparent manner; and
• Re-establishing a credible technical and social foundation for future redevelopment.

The plan will be presented to government agencies, COOMIGASP, and other stakeholders, and will set realistic milestones for re-permitting and advancing the project toward a restart. By implementing this framework, Helius aims to systematically identify and mitigate risks, provide transparent updates to stakeholders as it advances its due diligence and technical review of the Serra Pelada Project with the goal to rebuild market confidence, and create a sustainable path to future development of the Serra Pelada Project.

NI 43-101 Technical Disclosure

As part of its due diligence, Helius anticipates filing an initial NI 43-101 Technical Report on the Serra Pelada Project. This report will not declare mineral resources but will consolidate and reinterpret historical drilling and underground development data for future resource confirmation. The report will include explicit risk carve-outs in connection with environmental liabilities, community relations, outstanding creditor claims, and the status of the Brazilian subsidiaries.

This work will allow Helius to provide the market and stakeholders with a transparent technical and legal baseline, creating a credible platform to engage regulators, investors, and community partners while progressing toward re-permitting and redevelopment.

The proposed Acquisition, if completed, will constitute a "Fundamental Acquisition" under the policies of the TSXV. Prior to or concurrent with the closing of the Acquisition, Helius expects to complete one or more financings to raise working capital and to finance the anticipated expenses required to complete the Acquisition, as well as to satisfy the conditions precedent for closing, with the final terms and aggregate amount of the financings to be determined by the Company upon the completion of the due diligence and the finalization of the Strategic Plan.

Qualified Person

Christian Grainger (PhD, AIG), President and CEO of the Company is a qualified person as defined in National Instrument 43-101 Standards of Disclosure for Mineral Projects. Mr. Grainger has reviewed and approved the scientific and technical information contained in this news release.

About Helius Minerals Limited

Helius is a mineral exploration company focused on the identification and development of high-quality mineral assets across the Americas, with an emphasis on South American jurisdictions.

On behalf of the Board of Directors,

Helius Minerals Limited

Christian Grainger (PhD, AIG)
President and CEO
M: +57 3146364676
cg@heliusminerals.com

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 press 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. These forward-looking statements, include, but are not limited to, statements regarding the Company's progress towards the acquisition of the Serra Pelada Project, the Company's progress on its due diligence review of the Serra Pelada Project, the anticipated timing to complete the Organizational Period Requirements, the grant and exercise of the Option, the terms of any future financings, the filing of a National Instrument 43-101 Technical Report on the Serra Pelada Project, plans to return the Serra Pelada Project to good standing with Brazilian regulatory authorities, plans to resolve outstanding debts of the subsidiaries of Colossus, strategies for re-permitting, stakeholder engagement, and the redevelopment of the Serra Pelada Project, future rehabilitation of the Serra Pelada Project. 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 Colossus and its subsidiaries; 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 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.

SOURCE Helius Minerals Limited