GR Silver Mining Reports High-Grade Silver Intercepts in San Marcial Area Step-Out Drilling. SMS25-12 Returns 5.0 m at 232 g/t Ag, from 332.6m downhole, including 0.9 m at 956 g/t Ag
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On November 19, 2025, GR Silver Mining announced high-grade silver results from its step-out drilling program at the San Marcial Area of the Plomosas Project. The highlight intercept was from hole SMS25-12, which returned 5.0 meters grading 232 g/t silver (Ag), including a higher-grade core of 0.9 meters at 956 g/t Ag. The results from this and hole SMS25-11 extend the silver mineralization approximately 75 meters below the current San Marcial Mineral Resource Area.
President and CEO Marcio Fonseca stated that this success strengthens the company's confidence in a large, continuous silver system. He also announced plans for a "significant step-out drilling program" in the first half of 2026, which could potentially double the existing mineralization footprint to support resource growth.
The news is materially positive and represents a solid continuation of the company's successful 2025 exploration campaign at San Marcial. While not as spectacular as the blockbuster 75-meter intercept announced on September 3, 2025, these results are significant for several reasons:
- Confirms Exploration Model: The results successfully extend known high-grade mineralization at depth, validating the company's geological model and targeting strategy. For an exploration company, consistent success is crucial for building market confidence.
- Supports Resource Growth: By extending mineralization 75 meters below the existing resource, this drilling directly contributes to the potential for a larger resource in a future update. This is the primary value driver for the company at this stage.
- Sets Up 2026 Program: The results provide the justification for the larger, more aggressive drill program planned for 2026. The CEO's goal to "potentially double the existing silver mineralization footprint" is a bold, forward-looking statement that is now supported by another set of positive data points.
- Continues Momentum: The company has released a steady flow of positive news throughout the second half of 2025, starting with a major financing in August, followed by a series of strong drill results. This release maintains that positive momentum.
The market was likely anticipating good results from the remainder of the 2025 program. This news meets those expectations and de-risks the project's expansion potential. It reinforces the thesis that San Marcial is the upper portion of a much larger epithermal system.
GR Silver Mining Ltd. is a Canadian-based, Mexico-focused mineral exploration company. Its key asset is the 100%-owned, 7,823-hectare Plomosas Project, located in the Rosario Mining District in Sinaloa, Mexico. The project is an emerging high-grade silver district with past-producing mine infrastructure.
The flagship project has two main areas of focus: 1. San Marcial Area: This is the primary exploration target, hosting a high-grade, near-surface silver resource. The company's 2025 exploration has focused on step-out drilling to expand this resource, with significant success in identifying wide, high-grade hydrothermal breccias and extending mineralization at depth. 2. Plomosas Mine Area: A historical underground lead-zinc-silver-gold mine operated by Grupo Mexico from 1985-2000. It contains significant existing infrastructure (7.4 km of tunnels, road access, power). GR Silver is currently conducting underground sampling and metallurgical work to support a decision on implementing a Bulk Sampling Test Mining (BSTM) program.