Heliostar Drills 30.2m Grading 6.29 g/t Gold in First Resource Conversion Holes at Ana Paula

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Vancouver, British Columbia—(Newsfile Corp. – August 27, 2025) — Heliostar Metals Ltd. (“Heliostar” or the “Company”).

Highlights

• 30.20 m @ 6.29 g/t Au from 195.8 m
• 14.75 m @ 13.6 g/t Au from 153.5 m
• 20.95 m @ 6.67 g/t Au from 113.5 m
• 12.20 m @ 8.72 g/t Au from 344.5 m
• Consistent gold mineralization at the western end of the High Grade Panel
• First results from a 15,000 m program continuing throughout 2025

Heliostar Metals Ltd. is pleased to announce its first 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.

Drilling Program

Heliostar has two rigs turning with 18 holes completed and 5,556 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 approach at Ana Paula rotates drilling by ~90° from most historic intercepts, which the Company interprets has contributed to demonstrating more continuous and higher-grade gold mineralization within the High Grade Panel than previous operators recognized.

Where appropriate, 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-25-323 and AP-25-325 are resource conversion holes drilled at the western end of the High Grade Panel. AP-25-323 was drilled further west than the most prospective polymictic breccia host unit and still returned a number of attractive intercepts, including 12.2 m @ 8.73 g/t Au from 344.5 m.

AP-25-325 (~30 m southeast of AP-25-323) intercepted the favourable breccia host unit and returned a wide, high-grade interval of 30.2 m @ 6.29 g/t Au from 195.8 m, plus deeper hits with potential to expand the resource, including 4.5 m @ 12.6 g/t Au from 277.5 m beneath the High Grade Panel.

Holes AP-25-322 and AP-25-324 are geotechnical holes for mine development planning and returned assay results in line with expectations, including 14.75 m @ 13.6 g/t Au from 153.5 m in AP-25-322.

Drilling continues at the less well-defined western edge of the High Grade Panel, with results from three additional holes pending from this area. Recently, drilling has been focused in the centre of the High Grade Panel with assays from seven holes pending. The next Ana Paula drill results are anticipated for mid- to late September.

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

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Figure 2: Cross-Section through hole AP-25-325

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Table 1: Significant Drill Intersections

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 analysis at the ALS laboratory in North Vancouver. Both 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. Certified reference and blank samples were systematically inserted and analyzed as part of QA/QC. True widths are not reported as mineralization occurs as disseminations or vein stockworks with variable controls.

Statement of Qualified Person

Stewart Harris, P.Geo., a Qualified Person as defined by NI 43-101, has reviewed the scientific and technical information in 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, including the Ana Paula project (Guerrero), the Cerro del Gallo project (Guanajuato), the San Antonio project (Baja Sur) and the Unga project (Alaska, USA).

For Additional Information

Charles Funk, President & Chief Executive Officer
Heliostar Metals Limited
Email: charles.funk@heliostarmetals.com
Phone: +1 844-753-0045

Rob Grey, Investor Relations Manager
Heliostar Metals Limited
Email: rob.grey@heliostarmetals.com
Phone: +1 844-753-0045

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 current views with respect to future events and are based upon a number of assumptions and estimates that are inherently subject to significant business, economic, competitive, political, and social uncertainties and contingencies. Many factors, both known and unknown, could cause actual results to differ materially, including, without limitation, precious metals price volatility; risks associated with operating in foreign jurisdictions; regulatory or permitting delays; reliance on management and contractors; exploration and mining risks; inability to obtain insurance on acceptable terms; currency fluctuations; insufficient cash flow from operations; financing risks; uncertainties inherent in mining projects (including reserves/resources, recoveries, and cost estimates); title contests; environmental, health and safety laws and regulations; community impacts; integration of acquired assets; speculative nature of exploration and development; market volatility; conflicts of interest; limited liquidity; and litigation. See “Risk Factors” in the Company’s public disclosure documents. The Company does not intend, and does not assume any obligation, to update forward-looking statements or information except as required by applicable law.