GR Silver Mining Intersects Extensive High-Grade Epithermal Silver System. SMS25-09 Returns 75 m at 293 g/t AgEq, including 6.4 m at 1,915 g/t AgEq

Executive Summary

• GR Silver Mining announced a significant step‑out drill intercept (hole SMS25‑09) of 75 m @ 293 g/t AgEq, including a high‑grade interval of 6.4 m @ 1,915 g/t AgEq.
• The result extends the known high‑grade silver mineralization an additional ≈100 m beyond the current resource outline at the San Marcial area of the Plomosas Project, confirming continuity of the epithermal system and indicating substantial upside for future resource growth.
• High‑grade gold values were also intersected, and the drilling confirms that the mineralized zone remains open both down‑dip and down‑plunge, supporting a large, potentially multi‑million ounce silver‑gold system.

Key Details

• Hole SMS25‑09 intercept: 75 m @ 293 g/t AgEq (overall); includes 6.4 m @ 1,915 g/t AgEq and several intervals >1,000 g/t AgEq.
• Assay highlights (selected intervals):
• 158.8‑162.6 m – 3.8 m @ 96 g/t AgEq, 44 g/t Ag, 0.12 % Pb, 0.2 % Zn.
• 263.9‑339.1 m – 75.2 m @ 293 g/t AgEq, 260 g/t Ag, 0.1 % Pb, 0.2 % Zn.
• 296.8‑303.2 m – 6.4 m @ 1,915 g/t AgEq, 1,853 g/t Ag, 0.04 % Pb, 0.3 % Zn.
• 336.5‑338.3 m – 1.8 m @ 1,759 g/t AgEq, 1,363 g/t Ag, 1.10 % Pb, 2.42 % Zn.
• Geological context: Intersected hydrothermal breccia with chlorite‑hematite alteration, boiling textures, and selective gold mineralization; indicative of a well‑preserved epithermal system linked to a regional porphyry intrusive setting.
• Resource expansion implication: Mineralization now shown to extend at least 100 m horizontally beyond the current resource area and remains open down‑dip and down‑plunge, with potential vertical continuity of ≈450 m from surface.
• Follow‑up drilling: Holes SMS25‑11 (in progress) and planned SMS25‑12 will test further extensions 100 m down plunge; additional step‑out holes listed in Table 2 are pending or underway.
• Qualified Person: Marcio Fonseca, P.Geo., President & CEO, NI 43‑101 qualified.

Notable Quotes

“Step‑Out drilling at San Marcial has delivered strong results… The results demonstrate significant potential for future resource growth, marking a key milestone that opens the door for continued expansion beyond current boundaries.” – Marcio Fonseca, President & CEO

Materiality Assessment: Material – Positive (the high‑grade intercept materially enhances the company’s exploration outlook and potential resource base).