Starcore Reports Declining Production at San Martin Mine

Starcore International Mines Ltd. (TSX: SAM) has announced a decline in production results for the first fiscal quarter ending October 2025 at its San Martin Mine located in Queretaro, Mexico. The company reported that metal production was adversely affected by two specific issues related to ore processing.

The primary challenge stemmed from the presence of clay in the ore, which led to a “preg-robbing” effect. This phenomenon occurs when clay traps gold, ultimately reducing the recovery rate. Additionally, fine particles of activated carbon, termed carbon fines, mixed with the pulp sent to the desorption process (ADR), further diminished the recovery of both gold and silver.

To mitigate the impact of the clay issue, Starcore has optimized the use of its Carbon-in-Leach (CIL) plant to enhance gold recovery. Addressing the carbon fines problem involved the installation of two filter presses—one at the discharge of the ADR process and another in the thickener tank, where the solution is recycled for reuse. These steps aim to prevent any contamination between the two processing circuits, which is crucial for improving overall efficiency.

Furthermore, the company is in the process of installing a cyanide destruction module. This innovative addition will facilitate the processing of carbonaceous ore without the use of cyanide during grinding. With these improvements, Starcore anticipates resuming the processing of stockpiled carbonaceous ore at the mine within this month.

Salvador García, the Chief Operating Officer of Starcore, emphasized the company’s commitment to developing multiple sources of ore that will require different processing methods to continue producing profitable ounces. He stated, “We will have multiple sources of ore requiring different processing methods so as to continue to produce profitable ounces.”

In compliance with NI 43-101 regulations, García, a director of the company, is recognized as the qualified person overseeing the project. His insights are crucial in ensuring the technical information disseminated aligns with industry standards.

Starcore International Mines is primarily engaged in precious metals production, with a strong focus and operational experience in Mexico. In addition to its production assets, the company is actively involved in exploration and development projects throughout North America and has extended its reach internationally with a project in Côte d’Ivoire.

The company positions itself as a leader in Corporate Social Responsibility, advocating for value-driven decisions that will enhance long-term shareholder value. For more information, interested parties can visit Starcore’s investor-friendly website at www.starcore.com.

ON BEHALF OF STARCORE INTERNATIONAL MINES LTD
Signed “Robert Eadie”
Robert Eadie, Chief Executive Officer

For further information, please contact:
Robert Eadie
Telephone: (604) 602-4935 x 205
Toll Free: 1-866-602-4935
Email: [email protected]

The Toronto Stock Exchange has not reviewed nor does it accept responsibility for the adequacy or accuracy of this press release. This announcement contains forward-looking statements regarding management’s expectations and the potential of the company’s projects. Readers are advised to avoid placing undue reliance on these statements as actual results may differ materially.

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