Heliostar Metals Files Preliminary Economic Assessment for Ana Paula Project in Mexico

Heliostar Advances Ana Paula Project with Technical Report Filing

Heliostar Metals Ltd. (TSXV: HSTR) (OTCQX: HSTXF) (FSE: RGG1) announced on December 22, 2025, that it has officially filed the Preliminary Economic Assessment (PEA) Technical Report for its flagship Ana Paula Project. The project is a significant gold and silver development located in Guerrero, Mexico.

Trigger and Background

The filing of the PEA Technical Report follows a previous announcement made by the company on November 6, 2025. The PEA is a crucial step in the mining project lifecycle, providing an initial assessment of the potential viability of a mineral project and establishing a baseline for future studies, such as a Pre-Feasibility Study (PFS) or Feasibility Study (FS).

Vancouver, British Columbia—(Newsfile Corp. - December 22, 2025) — Heliostar Metals Ltd. (TSXV: HSTR) (OTCQX: HSTXF) (FSE: RGG1) (“Heliostar” or the “Company”) announces that, further to its news release dated November 6, 2025, it has filed a Preliminary Economic Assessment Technical Report for its Ana Paula Project located in Guerrero, Mexico.

Market and Sector Implications

The successful filing of the PEA Technical Report signals continued progress for Heliostar in advancing the Ana Paula Project. For the junior mining sector, the completion and filing of such technical reports often serve as a catalyst for investor interest, as they provide the first detailed look at the project's economic potential, including metrics like Net Present Value (NPV), Internal Rate of Return (IRR), and capital expenditure requirements (CAPEX).

While the specific financial metrics of the PEA were not detailed in the filing announcement, the completion of the technical report is a prerequisite for maintaining compliance with regulatory bodies like the TSX Venture Exchange (TSXV) and adhering to standards such as National Instrument 43-101 (NI 43-101) in Canada, which governs the disclosure of scientific and technical information concerning mineral projects.

Forward-Looking Guidance

The filing of the PEA report is expected to provide the foundation for Heliostar’s strategic planning for the Ana Paula asset. Future steps will likely involve detailed engineering, further exploration drilling to expand or upgrade the resource base, and potentially moving toward a more detailed economic study. Investors will be looking for the company to release the key economic highlights of the PEA, which will determine the market's reaction and the project's perceived value.

• The Ana Paula Project is located in Guerrero, Mexico, a known mining jurisdiction.
• The PEA Technical Report was filed on December 22, 2025.
• The filing follows a prior news release issued on November 6, 2025.
• The report is critical for assessing the initial economic viability of the gold and silver asset.