Heliostar Announces Positive Prefeasibility Study For Cerro Del Gallo With Significant Expansion Potential

Figure 1 - Isometric View of Cerro del Gallo Resource with Reserve Pit Shell

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Figure 2 - Cross Section through Cerro del Gallo Resource with Reserve Pit Shell

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Forecast Operating Cost Estimates

Operating costs at the Cerro del Gallo Project will benefit from the simplicity of a truck and shovel open pit mine, very low strip ratio, and access to low-cost grid power and regional infrastructure. The crush-agglomerate-heap-leach-ADR-SART flowsheet utilizes industry standard equipment and processes. It supports efficient processing of the Cerro del Gallo ore with moderate reagent use and no requirement for milling or conventional tailings storage.

Estimations of total cash costs average US$1,252/GEO, with AISC of US$1,390/GEO over the 15.3-year mine life. Revenue credits from copper and silver recovered through the SART circuit further strengthen operating margins and contribute to a robust, long-life cost profile.

Total Operating Cost Summary

Forecast Capital Cost Estimates

The initial capital cost for the project is estimated to be $195.3M including $15.6M for initial working capital (60 days) and $22.3M in total contingency. The total initial required capital expenditure will benefit from proximity to infrastructure and the assumption of a contractor-supplied fleet. Sustaining capital costs are primarily related to completion of a powerline to the site and three leach pad expansions. The cost estimate is based on more advanced work that will progress into a feasibility study, however, it includes a contingency of 17.5% of the total cost.

The Company's LOM plan allocates US$132.0M for reclamation work at the end of the mine life.

Forecast Capital Cost Summary

Economic Analysis

The economic analysis shows a base case after-tax net present value at a discount rate of 5% of US$423.9M, an after-tax internal rate of return of 33.1%, and a payback period of 2.3 years at US$2,300/oz gold. The projected mine life is 15.3 years in the PFS. Approximately 1,310k GEOs (888 koz gold, 22.2 Moz silver and 59 kT copper) are projected to be produced and sold over the life of the mine.

Summary Economic Results

Metal Prices

The gold market has experienced significant upward price movement in the past few years. The gold price at the effective date of the technical report is about 83% above the base case gold price used in the study.

The sensitivity analysis presents gold price scenarios up to US$4,100/gold ounce (near spot prices) to understand the potential impact of continued gold price movements. From the base case price of $2,300/oz, a change in the average gold price of 10% (US$230/gold ounce) would change the after-tax NPV5% by approximately US$76.2M.

The economics of the Prefeasibility Study are most sensitive to changes in gold price and grade and less sensitive to operating costs and initial capital costs.

Gold Price Sensitivity Analysis

Figure 3 - Planned Cerro del Gallo Site Layout

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Figure 4 - Cerro del Gallo Process Flow Sheet
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Figure 5 - Cerro del Gallo Planned Production Schedule

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Next steps

The next steps by Heliostar at Cerro del Gallo will focus on conversion of resources to reserves and additional resource growth.

This plan includes additional resource and reserve drilling, updating geological interpretations, metallurgical testing and trade off studies. Positive changes to the gold price have resulted in an increase to the potential size of the reserve. Additional metallurgical analysis and data points are required on the deposit to support this increase.

The Company intends to drill with a focus on increasing both mineral resources and reserves and to improve the geological interpretation for the deposit. Mineralization remains open to the north and at depth. The north is considered a high potential target for reserve growth but historically was not drilled due to surface access limitations. The drill density decreases at depth as noted in Figure 2 with in-fill drilling having potential to improve resource classifications. Further, mineralization is open at depth with potential to expand resources.

Subject to confirming the extent of the mineral resource at Cerro del Gallo, the Company intends to refine the planned process flowsheet, start preparing permitting and social plans and commence work to prepare a feasibility study. Development of Cerro del Gallo is planned after Ana Paula has been commissioned and is in production.

Mineral Resource Estimates

Mineral Resources for the Cerro del Gallo deposit were updated as part of the 2025 Prefeasibility Study and are summarized in the accompanying table. The Mineral Resources have an effective date of July 31, 2025, and are reported on an in-situ basis in accordance with the 2014 Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Definition Standards for Mineral Resources and Mineral Reserves.

Mineral Resources Statement

Notes to accompany Mineral Resources table:

Mineral Reserve Estimates

Mineral Reserves for the Cerro del Gallo deposit as part of the 2025 Prefeasibility Study have an effective date of July 31, 2025, are reported at the point of delivery to the leach facility, and are stated in accordance with the 2014 CIM Definition Standards for Mineral Resources and Mineral Reserves.

The Mineral Reserves estimate is based on a 6 Mtpa open-pit mining operation, with ore processed through the established crushing, agglomeration, heap-leach, ADR, and SART circuits. The resulting Mineral Reserves statement is provided in the following table.

Mineral Reserves Statement

Notes to accompany Mineral Reserves table:

Qualified Persons

The technical report for the Cerro del Gallo Project will be prepared for Heliostar Metals Ltd. by Mr. Ted Eggleston, Ph.D., RM SME, PGEO, Mr. Tim Kuhl, MSc, RPG, RM-SME, Mr. Jeffrey Choquette, P.E., Mr. Marvin Silva, PhD, PE, PEng., Mr. Todd Minard P.E., Mr. Travis Manning, P.E., QP, Mr. Carl Defilippi, RM SME, and Ms. Dawn Garcia, CPG. Each of these Qualified Persons has reviewed and approved the technical information contained in this news release in their area of expertise and are independent of the Company.

Qualified Persons with Respect to this News Release

Gregg Bush, P.Eng. and Mike Gingles, the Company's Qualified Persons, as such term is defined by National Instrument 43-101 - Standards of Disclosure for Mineral Projects, have reviewed the scientific and technical information not derived from the updated technical reports and included in this news release in the Company Overview, Commentary by the Company on Relevant Matters and Commentary by the Company on Next Steps and Permitting sections for each property and have approved the disclosure herein.

Data Verification

The Qualified Persons for the technical reports verified the data in the report for their areas of expertise and concluded that the information supported Mineral Resource estimation, and could be used in mine planning and economic analysis. The verification completed by each Qualified Person is discussed in each technical report and included site visits, and could include data audits, evaluation of the suitability of data for use in estimation and mine planning, quality assurance and quality control checks, review of available technical and economic study data, review of data collection and evaluation methods, review of production data including reconciliation where available, review of actual cost data for operations, and review of third-party inputs to forecasts.

The Company's Qualified persons verified the information that was not derived from the technical reports. The data verification included site visits, data audits, review of available study data, review of data collection and evaluation methods, review of production data including reconciliation where available, review of actual cost data for operations, and review of third-party inputs to forecasts, and consideration of the Company's plans for the projects.

About Heliostar Metals Ltd.

Heliostar is a gold mining company with production from operating mines in Mexico. This includes the La Colorada Mine in Sonora and the San Agustin Mine in Durango. The Company also has a strong portfolio of development and exploration stage projects in Mexico and the USA. These include the Ana Paula project in Guerrero, the Cerro del Gallo project in Guanajuato, the San Antonio project in Baja Sur, all in Mexico and the Unga project in Alaska, USA.

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Neither 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 release.

Cautionary Statement Regarding Forward-Looking Information

This news release contains "forward-looking statements" and "forward-looking information" (together, "forward-looking statements") within the meaning of applicable Canadian securities laws and the United States Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical fact, are forward-looking statements and are based on the opinions and estimates of management as of the date hereof. Forward-looking statements in this release include, but are not limited to: the economic potential or projections of the PFS, including, but not limited to, estimates of capital and operating costs, mine life, throughput, grades, recoveries, production rates, payback period, NPV and IRR; statements regarding expected timing, scope and cost of planned exploration, drilling, metallurgical and engineering programs, or any future work or social programs generally; the anticipated timing of completion of a Feasibility Study; expectations concerning permitting, submission and approval of amendment applications; the timing and potential development of an underground decline or early-works program; the potential for additional mineralization at depth and future exploration success or improvements in resource classification; the availability of the PFS within the prescribed deadline, the Company's plans regarding financing arrangements, including the potential for a project finance facility; the expectation that cash flow from existing operations may fund future development; projections of future metal prices; the potential for Cerro Del Gallo to be placed into production and the timing thereof; and other statements regarding the Company's future plans, strategies, objectives, expectations and intentions.

Forward-looking statements are based on a number of assumptions considered reasonable by management at the time of making such statements, including, without limitation: the accuracy of the PEA assumptions and parameters; that required permits and approvals will be obtained on reasonable terms and within expected timeframes; the availability of financing for exploration and development activities on acceptable terms; that projected metallurgical recoveries and operating costs will be achieved; that community and governmental support for operations will continue; the reliability of certain assumptions and known risks; and general stability in economic and market conditions, exchange rates and commodity prices.

Forward-looking statements are subject to known and unknown risks, uncertainties and other factors that may cause actual results to differ materially from those expressed or implied. Such risks include, without limitation: the preliminary nature of the PFS; risks related to exploration, development, permitting and operating activities; cost escalation and inflation; geopolitical or economic uncertainty or force majeure events; changes in metal prices and exchange rates; financing and liquidity risks; community and environmental risks; reliance on contractors and third parties; title, tax and legal risks; and those risks set out in the Company's continuous disclosure filings available on SEDAR+ ( ).

There can be no assurance that the Cerro del Gallo Project will be developed into a producing mine or that the results of the PFS will be realized. The purpose of the forward-looking statements is to provide information about management's current expectations and plans and may not be appropriate for other purposes. Readers are cautioned not to place undue reliance on forward-looking statements, which speak only as of the date of this release. Except as required by applicable securities laws, the Company does not undertake to update any forward-looking statements, whether as a result of new information, future events or otherwise.

No Production Decision: The Company cautions that it has not made a production decision with respect to the Cerro del Gallo Project. Any such decision would only be made following completion of a Feasibility Study, the arrangement of project financing, and receipt of all necessary permits and approvals.

Cautionary Note to U.S. Investors

Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability, and U.S. investors are cautioned that terms such as "Measured," "Indicated" and "Inferred Mineral Resource" are recognized and required by Canadian regulations but may not be comparable to similar terms used in U.S. reporting standards.

Non-IFRS Financial Measures

This news release includes certain non-International Financial Reporting Standards ("IFRS") performance measures, including cash costs ("Cash Costs") and all-in sustaining costs ("AISC"). These measures are not standardized financial measures under IFRS and may not be comparable to similar measures used by other issuers. They are provided as additional information to investors and should not be considered in isolation or as a substitute for measures prepared in accordance with IFRS. Cash Costs and AISC are common financial performance measures in the gold mining industry but do not have any standardized meaning under IFRS. The Company believes that, in addition to conventional measures prepared in accordance with IFRS, certain investors use these metrics to evaluate the economic performance of mining projects and their potential to generate operating earnings and cash flow.

AISC is calculated in accordance with the guidelines published by the World Gold Council ("WGC") in 2013, as updated in 2018, which define AISC as the sum of total cash costs, sustaining capital expenditures, and corporate general and administrative costs, among other items. Other companies may calculate this measure differently due to variations in underlying principles and policies applied. Note that in respect of AISC metrics disclosed herein, corporate general and administrative expenses have not been included, as such economics are presented at the project level.

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SOURCE: Heliostar Metals Ltd.

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