GR Silver drills 19.9 m of 250 g/t AgEq at Plomosas

Executive Summary

• GR Silver Mining reported high‑grade silver and gold intercepts from stepout drilling at the San Marcial area, including a 19.9 m @ 250 g/t AgEq zone with a 1.3 m @ 954 g/t AgEq sub‑intercept (SMS25-08).
• A new gold‑silver epithermal vein was discovered in SMS25-08 grading 1,685 g/t AgEq (24.6 g/t Au, 13 g/t Ag) over 1.0 m at shallow depth.
• Additional wide silver zones were intersected in holes SMS25-07A and other drill intervals, supporting potential expansion of the existing NI 43‑101 resource.

Key Details

• Hole SMS25-08: 19.9 m @ 250 g/t AgEq (21.5 m depth) including 1.3 m @ 954 g/t AgEq; also 3.7 m @ 557 g/t AgEq and 4.2 m @ 350 g/t AgEq.
• Gold‑Silver Vein (SMS25-08): 1.0 m @ 1,685 g/t AgEq (24.6 g/t Au, 13 g/t Ag) discovered at 244.5 m depth.
• Hole SMS25-07A: Intersected 11.1 m @ 71 g/t AgEq and other wide silver zones; located 125 m along strike from previous hole SMS25‑04 (36 m @ 114 g/t AgEq).
• Drilling targets the Parallel Breccia target to test down‑dip continuity of historic trench results (SMTr‑022: 24 m @ 219 g/t AgEq) and to explore northeast‑oriented fault intersections.
• Ongoing drilling with two diamond rigs focuses on the SE Deep extension and Parallel Breccia targets; assay results pending for deeper holes.
• QA/QC procedures include blanks, duplicates, standards, and re‑assaying of samples >100 ppm Ag; labs: SGS de México.
• Qualified Person: Marcio Fonseca, P.Geo., President & CEO (NI 43‑101).

Notable Quotes

“Each batch of drill results received from the stepout drilling program increases the prospective scale of the San Marcial area, potentially unlocking a much larger resource.” – Marcio Fonseca, President & CEO.