Euro Sun Welcomes Romania’s Steps to Adopt the European Union’s Critical Raw Materials Act and Reports Stronger Project Economics With NPV Rising to US$1.78 Billion at Rovina Valley

TORONTO, Nov. 14, 2025 - Euro Sun Mining Inc., (TSX: ESM) ("Euro Sun", "ESM", or the "Company") is delighted to announce that under an Emergency Ordinance, the Romanian Government has established a national regulatory and administrative framework for creating a Single Point of Contact to implement the European Union's Critical Raw Materials Act ("CRMA"). This is aimed to fast-track permitting and simplify procedures for projects with strategic status.

Along with the completion of Euro Sun's environmental impact assessment technical report, the Company is also pleased to share the results of its optimized and updated definitive feasibility study ("DFS") respecting CAPEX and OPEX revalidation and economic modelling, finalized this week for the Colnic and Rovina open pits - representing the first stage of development at the Company's flagship Rovina Valley Copper-Gold Project. All amounts summarized below are in US dollars unless otherwise indicated.

Key Highlights Include (summary table set out in Table 1):

• Pre-tax net present value ("NPV") increased 173% to $1,776 million, with a pre-tax internal rate of return ("IRR") of 39.7%, based on $4.5/lb copper and $3,300/oz gold
• Estimated to produce 403Mlbs of copper and 1.472Moz of gold over the life of the project (first stage development) at an all-in sustaining costs ("AISC") of $1,206.3/gold equivalent ounce
• The updated study incorporates the most current cost and capital expenditure ("CAPEX") data, with initial CAPEX of $607.1 million
• The Rovina Valley Project incorporates dry stack tailings and is a cyanide free operation

Commenting on the latest developments, Grant Sboros, Chief Executive Officer of Euro Sun said, "It has been a good week for Euro Sun. We are obviously jubilant that finally the Single Point Of Contact part of the EU's CRMA regulation has been implemented into Romanian law. This major milestone finally provides our company with a streamlined framework to advance permitting to construct the mine.

We are also pleased to report that the results of our updated economic modelling for the DFS are significant, and that our environmental impact assessment technical report has now been successfully completed. The notable increase in the value of the project - including pre-tax NPV to US$1.77 billion - continues to underscore the economic strength of our Rovina Valley Project and its potential as one of Europe's most important future sources of strategic metals.

At this time, I would also like to extend my sincere appreciation to our chairman, board and investors for their continued patience and confidence shown to me these past few months as we worked to support the CRMA implementation, along with finalizing both our updated DFS and environmental impact assessment. All these crucial milestones bring us markedly closer on our path to responsible development."

Secured Debenture Repayment

The Company is also pleased to announce that it has repaid the debenture (the "Debenture") previously entered into with a holding company of a director of the Company in the principal amount of $350,000 (the "Principal Amount") and which had a maturity date of December 19, 2025. The Debenture was secured against all of the assets and property of the Company pursuant to a general security agreement. Following the repayment of all the Principal Amount and accrued interest under the Debenture, the general security agreement is no longer in place, with all security interests released and no residual encumbrances. The Company relied on exemptions from the formal valuation and minority shareholder approval requirements of Multilateral Instrument 61?101 Protection of Minority Security Holders in Special Transactions respecting the issuance of the Debenture For more information about the Debenture, please see the Company's press release dated February 13, 2025, which is available under the Company's SEDAR+ profile at www.sedarplus.ca.

Appointment of Cantor Fitzgerald Canada Corp.

Euro Sun is also pleased to announce that it has engaged Cantor Fitzgerald Canada Corp. as its exclusive financial advisor to assist in evaluating potential strategic transactions involving the Company or its assets, including mergers, acquisitions, or sales. This engagement supports Euro Sun's ongoing efforts to maximize shareholder value at its flagship Rovina Valley Copper-Gold Project in Romania, a key European strategic asset under the European Union's Critical Raw Materials Act.

"We are excited to partner with Cantor Fitzgerald to explore opportunities that align with our growth objectives," said Grant Sboros.

Environmental Impact Assessment

The Company also announces it has completed its environmental impact assessment technical report and management intends to work closely with Romanian officials to coordinate the official submission of the document. This milestone, together with the recent designation as a strategic asset under the CRMA, helps advance the Rovina Valley Project towards construction.

Definitive Feasibility Study

The optimized and updated economic modelling of the DFS for the Rovina Valley Project continues to focus on responsible mining procedures including, dry stacking, continuous revegetation, and a cyanide free processing facility. The updated economic modelling for the DFS also incorporated updated cost estimates and metal price assumptions.

Euro Sun is incorporating strong responsible mining procedures into every aspect of the project and is utilizing a phased development approach for the Rovina Valley Project. The Rovina Valley Project consists of two open pit copper-gold deposits, Colnic and Rovina, and the underground Ciresata copper-gold deposit. The Ciresata underground deposit is expected to be phased in following the completion of the Colnic and Rovina pits, assuming future mining studies are completed, and positive results are obtained.

Table 1: Updated Definitive Feasibility Highlights (first stage development)

The Company intends to file the technical report related to the updated DFS results on SEDAR+ within 45 days, in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects ("NI 43-101").

The scientific and technical information contained in this news release has been reviewed and approved by Dr. Andreas Rompel, ADAR Consulting Corp., Pr.Sci.Nat., FSAIMM, a "qualified person" within the meaning of NI 43-101 that is independent from the Company.

Rovina Valley Gold-Copper Project Overview

The Rovina Valley Project is situated in the Hunedoara County of Transylvania in western - central Romania. The Rovina Valley Project consists of three deposits, Rovina to the North, Colnic Central and the Ciresata deposit to the south. The DFS only incorporates the Rovina and the Colnic deposits and does not include the Ciresata deposit, which the Company expects will be brought into the project for development later, assuming future mining studies are completed, and positive results are obtained. The Rovina licence is held by Samax Romania S.R.L., a Romanian registered company which is a wholly owned subsidiary of ESM. Since November 2018, ESM possesses a mining licence with a renewable 20-year validity.

The Colnic and Ciresata deposits are described as gold-copper porphyries while the Rovina deposit is termed a copper-gold porphyry. All three of these deposits are located such that they can access a central processing plant. The Rovina Valley Project processing facility is being designed to produce copper-gold concentrate from the Colnic and Rovina deposits.

The Rovina Valley Project is located within the Golden Quadrilateral Mining District of the South Apuseni Mountains, an area with a history of mining dating back to pre-Roman times. This has supported the development of excellent infrastructure including rail, power and paved access roads. In addition, there are two international airports less than 180km from the project location, these being in the cities of Timisoara and Sibiu. The town of Brad is within 5km of the project site from where there will be a good source of local skilled labour. Sourcing the right skills and resources locally supports ESM community upliftment opportunities.

The Rovina Valley Project is expected to be mined in its first phase of development with a standard open-pit mining method using rigid dump trucks and hydraulic loaders. The open pit mining operation is anticipated to last approximately seventeen years, during which the lower-grade material will be stockpiled, if possible, for treatment at the tail end of mining operations.

Over the life of the project, it is expected that 140 Mt of ore will be mined. Of this ore, 123.3 Mt will be delivered to the processing facility and 16.7 Mt low grade ore stockpiled where possible for future processing. In aggregate, over the life of the mine, a total of 219 Mt of material will be mined and placed on the waste facility, representing a life of mine stripping ratio of 1.78:1.

About Euro Sun Mining Inc.

Euro Sun is a Toronto Stock Exchange-listed mining company focused on the exploration and development of its 100%-owned Rovina Valley Project located in west-central Romania, which hosts the second largest copper and gold deposit in Europe. Already granted European strategic status, the Rovina Valley Project is expected to unlock much needed investment and job creation in Hunedoara County and will deliver critical minerals necessary for Europe's green energy transition.

Further information:

For further information about Euro Sun Mining, or the contents of this press release, please contact Investor Relations at info@eurosunmining.com.

Caution regarding forward-looking information:

This press release contains statements which constitute "forward-looking information" within the meaning of applicable securities laws, including statements regarding the plans, intentions, beliefs and current expectations of the Company with respect to the Rovina Valley Project and the Company's future business activities and operating performance in respect thereof. Forward-looking information is often identified by the words "may", "would", "could", "should", "will", "intend", "plan", "anticipate", "believe", "estimate", "expect" or similar expressions and includes information regarding the Company's estimates, expectations, forecasts and guidance for production, waste material, all-in sustaining cost, capital expenditures, cost savings, project economics (including pre-tax NPV and after tax cashflows) and other information contained in the updated DFS; as well as references to other possible events, the future price of gold and copper, the estimation of mineral reserves and mineral resources, the realization of mineral reserve and mineral resource estimates, the timing and amount of estimated future production, costs of production, capital expenditures, costs and timing of the development of the project and mining and processing activities, requirements for additional capital, government regulation of mining operations, environmental risks and the anticipated timing for the filing of the updated DFS in accordance with NI 43-101.

Investors are cautioned that forward-looking information is not based on historical facts but instead reflect management's expectations, estimates or projections concerning future results or events based on the opinions, assumptions and estimates of management considered reasonable at the date the statements are made. Although the Company believes that the expectations reflected in such forward-looking information are reasonable, such information involves risks and uncertainties, and undue reliance should not be placed on such information, as unknown or unpredictable factors could have material adverse effects on future results, performance or achievements of the Company. This forward-looking information may be affected by risks and uncertainties in the combined business of the Company and market conditions, including (1) there being no significant disruptions affecting the Company's operations whether due to extreme weather events and other or related natural disasters, labor disruptions, supply disruptions, power disruptions, damage to equipment or otherwise; (2) permitting, development, operations and production for the Rovina Valley Project being consistent with the Company's expectations; (3) political and legal developments in Romania being consistent with current expectations; (4) certain price assumptions for gold and copper; (5) prices for diesel, electricity and other key supplies being approximately consistent with current levels; (6) the accuracy of the Company's mineral reserve and mineral resource estimates; (7) labor and materials costs increasing on a basis consistent with the Company's current expectations; and (8) environmental approvals and community engagement. This information is qualified in its entirety by cautionary statements and risk factor disclosure contained in filings made by the Company with the Canadian securities regulators, including the Company's annual information form, financial statements and related MD&A for the financial year ended December 31, 2024, filed with the securities regulatory authorities in certain provinces of Canada and available at www.sedarplus.ca.

Should one or more of these risks or uncertainties materialize, or should assumptions underlying the forward-looking information prove incorrect, actual results may vary materially from those described herein as intended, planned, anticipated, believed, estimated or expected. Although the Company has attempted to identify important risks, uncertainties and factors which could cause actual results to differ materially, there may be others that cause results not to be as anticipated, estimated or intended. The Company does not intend, and do not assume any obligation, to update this forward-looking information except as otherwise required by applicable law.

The Company has included certain non-GAAP financial measures in this press release, such as AISC per gold equivalent ounce and NPV. These non-GAAP financial measures do not have any standardized meaning. Accordingly, these financial measures are intended to provide additional information and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with International Financial Reporting Standards ("IFRS"). AISC, as defined by the World Gold Council, is a common financial performance measure in the mining industry but have no standard definition under IFRS. AISC include operating cash costs, net-smelter royalty, corporate costs, sustaining capital expenditure, sustaining exploration expenditure and capitalised stripping costs. Other companies may calculate these measures differently and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with IFRS.

The TSX does not accept responsibility for the adequacy or accuracy of this news release.