Guanajuato Silver Provides El Cubo Drill Results

~ Intercepts 26.7 g/t Au and 321 g/t Ag for 2591 g/t AgEq* over 0.42 metres ~

VANCOUVER, BC / ACCESS Newswire / October 16, 2025 / Guanajuato Silver Company Ltd. (the "Company" or "GSilver") (TSXV:GSVR)(OTCQX:GSVRF), a growing Mexican-based precious metals producer, is pleased to provide an update on the 2025 exploration and development drilling program at the Company's wholly owned El Cubo Mines Complex ("El Cubo") located in Guanajuato, Mexico.

Highlights

• Grades of over two kilograms per tonne silver-equivalent (AgEq) drilled at the Packman Vein in the Villalpando area near the Company's property boundary (PAC25-03: 26.7 g/t gold and 321 g/t silver for 2591 g/t AgEq* over 0.42 metres).

• Another new vein discovery near the San Luis Vein also returned grades of over two kilograms per tonne silver-equivalent (SL25-10: 13.02 g/t gold and 970 g/t silver for 2077 g/t AgEq* over 0.18 metres).

Image 1: El Cubo 3-D View of Principal Veins

Foto: Accesswire

*All references in this news release to silver equivalent or AgEq have been calculated using 85:1 silver/gold (Ag/Au). For 2025, GSilver's minimum mining width is 0.80 metres, and the minimum mining cut-off grade is 150 g/t.

James Anderson, Chairman and CEO, said, "El Cubo has been producing high grade silver and gold for over 120 years; we are encouraged by the latest round of drill results and look forward to developing these zones. Of particular interest, drilling in the San Luis area has generated the potential for yet another new high-grade vein discovery; it is compelling discoveries like these that have defined the Guanajuato Silver Mining District for more than four centuries."

El Cubo Diamond Drill Results

Foto: Accesswire

San Luis Vein
The east to west trending San Luis Vein has quickly taken on significant importance at the El Cubo Mine. In 2025, San Luis has contributed over 8,900 tonnes of mineralized material to El Cubo's production profile, and the most recent drilling provides better certainty for future volume and grade prediction. Important intercepts include SL25-02 which returned 1.12 g/t gold and 330 g/t silver over 0.52 metres, and SL25-04 which returned 1.27 g/t gold and 248 g/t silver over 0.72 metres. The relatively higher gold content in the San Luis Vein will continue to make this area of the mine a primary focus for continued exploration and potential expansion.