Heliostar Drills 88 m Grading 8.82 g/t Gold in Resource Conversion Drilling and Adds Third Drill Rig at Ana Paula

HIGHLIGHTS:

• 88.05 m grading 8.82 g/t gold from 88.2 m including
  • 35.5 m grading 13.03 g/t gold from 88.2 m
• 6.4 m grading 5.16 g/t gold from 39.8 m
• 14.3 m grading 4.19 g/t gold from 397.7 m
• 20.5 m grading 4.61 g/t gold from 198.8 m
• A third drill rig has been added to the Ana Paula program to accelerate the drilling program

Vancouver, British Columbia–(Newsfile Corp. – October 6, 2025) – Heliostar Metals Ltd. (TSXV: HSTR) (OTCQX: HSTXF) (FSE: RGG1) (“Heliostar” or the “Company“) is pleased to announce additional results from the current 15,000 metre drill program at its 100% owned Ana Paula project in Guerrero, Mexico. The program has the primary goal of converting inferred ounces to higher confidence classifications, as well as supporting the ongoing Feasibility Study and testing the next exploration targets around the Ana Paula deposit.

Heliostar CEO, Charles Funk, commented, “The drill results from the ongoing Ana Paula program continue to provide exciting results. The infill-focused drilling consistently returns broad, continuous intervals of strong grades as expected and – in some instances – hitting higher grade material than is currently estimated in the block model. We intend to make a construction decision for Ana Paula on the back of a Feasibility Study that will allow us to have the mine in production at 100,000 ounces per year in 2028. Our comprehensive plan to de-risk the deposit is ongoing and includes collecting additional technical data beyond assays that will help us design the mine. We are pushing hard toward this goal and, as such, have mobilized a third drill rig to the site in order to compress the timeline as much as possible. I see Ana Paula as a foundational asset of the high-quality mid-tier producer we are growing towards.”

Drilling Program

Heliostar has added a third drill to accelerate the drilling program and has completed 24 holes and 6,529 metres drilled to date. Drilling is designed along north-south sections with angled holes to best define the overall east-west orientation of the High Grade Panel. Heliostar’s drilling approach at Ana Paula has been to rotate drilling by approximately 90 degrees from the majority of historic intercepts. This change has been interpreted by the Company to have contributed to demonstrating more continuous and higher-grade gold mineralization within the High Grade Panel than previous operators recognized.

Where appropriate, the holes are also being used to collect rock strength data, hydrogeologic data and samples for further metallurgical studies that will directly influence the Ana Paula mine design in the ongoing Feasibility Study.

Drill Results Summary

Holes AP-25-327 and AP-25-329 are resource conversion holes drilled at the western end and the central part of the High Grade Panel. Hole AP-25-327 was drilled along the western edge of the polymictic breccia host unit and still returned a number of attractive intercepts, including 21.7 metres (“m”) grading 2.75 grams per tonne (“g/t”) gold in the Parallel Panel from 97.0 m and 20.5 m grading at 4.61 g/t gold from 198.8 m in the High Grade Panel.

AP-25-329 is located approximately 95m southeast of AP-25-327. It is the first north-to-south hole on a new cross-section through the deposit. The hole intercepted the favourable breccia host unit and returned a wide, high-grade interval of 88.05 m grading 8.82 g/t gold from 88.2 m through the core of the High Grade Panel. A near-surface 12.75 m intercept of 3.28 g/t gold through the Parallel Panel has the potential to expand the resource model to the surface.

Figure 1: Plan Map of the current drill program at Ana Paula

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Figure 2: Cross-Section through hole AP-25-329

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Holes AP-25-326 and AP-25-328 are geotechnical holes for mine development planning and returned assay results in line with expectations, including a hit of 23.0 m grading 2.86 g/t gold from 389.0 m in AP-25-326.

True widths are unknown. Mineralization at Ana Paula occurs as disseminations or vein stockworks with variable controls including rock porosity, lithology and fault networks.

Drilling continues at the less well-defined western edge of the High Grade Panel, with results from four additional holes pending from this area. Recently, drilling has been focused on the centre and eastern edge of the High Grade Panel, with assays from twelve holes pending from this area.

The next Ana Paula drill results are anticipated to be released in early November.

Drilling Results and Coordinates Tables

Table 1: Significant Drill Intersections

Drilling Coordinates Table

Table 2:  Drill Hole Details

Quality Assurance / Quality Control

Drill core is PQ size, and the core is cut in half, with half sent for analysis. Core samples were shipped to ALS Limited in Zacatecas, Zacatecas, Mexico, for sample preparation and for analysis at the ALS laboratory in North Vancouver. The Zacatecas and North Vancouver ALS facilities are ISO/IEC 17025 certified. Gold was assayed by 30-gram fire assay with atomic absorption spectroscopy finish, and overlimits were analyzed by 30-gram fire assay with gravimetric finish.

Control samples comprising certified reference and blank samples were systematically inserted into the sample stream and analyzed as part of the Company’s quality assurance / quality control protocol.

Statement of Qualified Person

Stewart Harris, P.Geo., a Qualified Person, as such term is defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects, has reviewed the scientific and technical information that forms the basis for this news release and has approved the disclosure herein. Mr. Harris is employed as Exploration Manager of the Company.

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 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 and the Unga project in Alaska, USA.

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 includes certain “Forward-Looking Statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995 and “forward-looking information” under applicable Canadian securities laws. When used in this news release, the words “anticipate”, “believe”, “estimate”, “expect”, “target”, “plan”, “forecast”, “may”, “would”, “could”, “schedule” and similar words or expressions, identify forward-looking statements or information. These forward-looking statements or information relate to, among other things, show the full extent of the deposit, upgrade and expand the resource base, growing our annual production profile in the near term and bringing additional production online.

Forward-looking statements and forward-looking information relating to the terms and completion of the Facility, any future mineral production, liquidity, and future exploration plans are based on management’s reasonable assumptions, estimates, expectations, analyses and opinions, which are based on management’s experience and perception of trends, current conditions and expected developments, and other factors that management believes are relevant and reasonable in the circumstances, but which may prove to be incorrect. Assumptions have been made regarding, among other things, the receipt of necessary approvals, price of metals; no escalation in the severity of public health crises or ongoing military conflicts; costs of exploration and development; the estimated costs of development of exploration projects; and the Company’s ability to operate in a safe and effective manner and its ability to obtain financing on reasonable terms.

These statements reflect the Company’s respective current views with respect to future events and are necessarily based upon a number of other assumptions and estimates that, while considered reasonable by management, are inherently subject to significant business, economic, competitive, political, and social uncertainties and contingencies. Many factors, both known and unknown, could cause actual results, performance, or achievements to be materially different from the results, performance or achievements that are or may be expressed or implied by such forward-looking statements or forward-looking information and the Company has made assumptions and estimates based on or related to many of these factors. Such factors include, without limitation: precious metals price volatility; risks associated with the conduct of the Company’s mining activities in foreign jurisdictions; regulatory, consent or permitting delays; risks relating to reliance on the Company’s management team and outside contractors; risks regarding exploration and mining activities; the Company’s inability to obtain insurance to cover all risks, on a commercially reasonable basis or at all; currency fluctuations; risks regarding the failure to generate sufficient cash flow from operations; risks relating to project financing and equity issuances; risks and unknowns inherent in all mining projects, including the inaccuracy of reserves and resources, metallurgical recoveries and capital and operating costs of such projects; contests over title to properties, particularly title to undeveloped properties; laws and regulations governing the environment, health and safety; the ability of the communities in which the Company operates to manage and cope with the implications of public health crises; the economic and financial implications of public health crises, ongoing military conflicts and general economic factors to the Company; operating or technical difficulties in connection with mining or development activities; employee relations, labour unrest or unavailability; the Company’s interactions with surrounding communities; the Company’s ability to successfully integrate acquired assets; the speculative nature of exploration and development, including the risks of diminishing quantities or grades of reserves; stock market volatility; conflicts of interest among certain directors and officers; lack of liquidity for shareholders of the Company; litigation risk; and the factors identified under the caption “Risk Factors” in the Company’s public disclosure documents. Readers are cautioned against attributing undue certainty to forward-looking statements or forward-looking information. Although the Company has attempted to identify important factors that could cause actual results to differ materially, there may be other factors that cause results not to be anticipated, estimated or intended. The Company does not intend, and does not assume any obligation, to update these forward-looking statements or forward-looking information to reflect changes in assumptions or changes in circumstances or any other events affecting such statements or information, other than as required by applicable law.

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