GR Silver Mining Drills 15.6 Metres of 351 G/T Silver at San Marcial Area, Plomosas Project, Mexico

Why It Matters

The high‑grade intercepts expand the known silver envelope, boosting the project's resource potential and attracting investment ahead of a 2026 resource estimate. Demonstrated depth continuity de‑risks the deposit and positions GR Silver for future bulk‑sampling and development.

Key Takeaways

• SMS26-01: 6.45 m @ 498 g/t Ag, 1.2 m @ 1,618 g/t.
• SMS26-03: 15.6 m @ 351 g/t Ag, 2.5 m @ 1,395 g/t.
• High‑grade zones extend to ~500 m depth, indicating open‑ended potential.
• New breccia targets could enlarge San Marcial resource footprint.
• Upcoming 2026 resource estimate likely to reflect substantial growth.

Pulse Analysis

The Plomosas Project sits on the southwestern edge of Mexico’s Sierra Madre Occidental, straddling Durango and Sinaloa. Historically anchored by the Plomosas underground mine (operated 1985‑2000), the 7,823‑hectare district now hosts a suite of intermediate‑ to low‑sulphidation epithermal systems rich in silver and gold. Existing infrastructure, road access, and legacy permits give GR Silver a strategic foothold to pursue cost‑effective expansion, especially in the San Marcial corridor, which has emerged as a high‑grade silver hotspot.

Step‑out drilling in 2026 has dramatically sharpened the geological model. SMS26-01 revealed a dual‑zone mineralization package: an upper andesitic dike intersected at 498 g/t silver and a lower chlorite‑hematite breccia delivering 61 m of continuous mineralization. SMS26-03 confirmed the east‑west extensional trend, delivering 15.6 m at 351 g/t silver within the same breccia system. These results prove that high‑grade silver persists from surface to at least 500 m depth, suggesting the epithermal envelope remains open both laterally and vertically. The presence of boiling textures, argentite, and acanthite further indicates the potential for additional high‑grade zones deeper than current intercepts.

From a market perspective, the drill outcomes reinforce GR Silver’s valuation narrative. High‑grade, shallow intercepts lower extraction costs and improve project economics, while depth continuity mitigates geological risk. The upcoming resource estimate in H2 2026 is expected to incorporate these new zones, potentially delivering a sizable uplift in contained silver ounces. Investors are watching for the next phase—bulk‑sampling and potential expansion into parallel breccia targets—which could transform San Marcial from a promising discovery into a flagship silver asset within the broader Rosario mining district.