GR Silver Confirms Extension of Mineralization at San Marcial, Including 16.1 m at 162 g/t Ag and 11.7 m at 147 g/t Ag in the SE Area
GR’s San Marcial step-outs extend the strike to approximately one kilometre, though grades and drilling pace fall short of the SMS26-04 bonanza.
GR Silver Mining Ltd. (GRSL) has released results for six new holes from its 2026 San Marcial step-out program in Mexico. The company states that the program has completed 6,292 m in 21 holes, with assays pending from seven holes.
Headline intercepts include:
- SMS26-12: 16.1 m true width at 162 g/t Ag from 375.05 m downhole, including 1.3 m at 477 g/t Ag and 0.7 m at 1,344 g/t Ag. The broader interval is 42.35 m true width at 95 g/t Ag from 369.90 m.
- SMS26-14: 11.7 m true width at 147 g/t Ag from 275.55 m downhole, including 2.85 m at 429 g/t Ag. The broader interval is 29.8 m true width at 87 g/t Ag, plus a separate 1.55 m at 208 g/t Ag.
- SMS26-09: 34.75 m true width at 15 g/t Ag, including 0.3 m at 180 g/t Ag.
- SMS26-10: 9.8 m true width at 24 g/t Ag, including 0.75 m at 101 g/t Ag, plus 5.0 m at 95 g/t Ag.
- SMS26-13: 9.5 m true width at 36 g/t Ag, including 1.05 m at 100 g/t Ag.
- SMS26-15: 1.7 m at 36 g/t Ag and 0.4 m at 94 g/t Ag.
The release indicates that mineralized breccias now extend at least 300 m southeast of the 2023 MRE boundary, 75 m deeper, and over about 1 km of total strike. CEO commentary notes that the pace has been slowed by distance, security issues, and the wet season, but says the program should re-accelerate in Q4.
GR Silver Mining Ltd. (GRSL) is an advanced explorer and developer with an existing 2023 Mineral Resource Estimate (MRE) of approximately 134 moz AgEq, according to the company’s investor presentation. The San Marcial discovery serves as the primary growth driver for the project. The company holds a market capitalization of about C$193 million at a share price of C$0.38, with approximately C$27.5 million in cash and no debt as of Q1 2026.
The latest release confirms and extends the San Marcial system, featuring a 300 m southeastern step-out and a 75 m depth extension. The system’s 1 km strike length supports the company’s district-scale narrative. However, the grade and width of the new drill holes are materially lower than the SMS26-04 bonanza that drew market attention in May. A July 10 release reported similar-grade step-out results, at which time the stock did not re-rate meaningfully.
The 2026 program was previously guided to support an updated MRE and Preliminary Economic Assessment (PEA) in the second half of 2026. This release now indicates an MRE update is targeted for the first half of 2027, representing a modest schedule slip. The share price has recovered from the post-SMS26-04 decline but remains well below the January 2026 high and does not appear to be pricing this release as a new discovery.
GR Silver Mining Ltd. is a Canadian-listed, Mexico-focused silver-gold explorer. Its core asset is the 100%-owned Plomosas Project in the Rosario Mining District, which covers the high-grade San Marcial discovery and the former Plomosas underground mine. The 2023 mineral resource estimate totals approximately 134 moz AgEq, split between San Marcial and Plomosas, per the provided investor presentation.
Financial context, from the provided financials: Q1 2026 net loss was C$2.43 million, operating cash flow was negative C$3.44 million, and cash was C$27.5 million at March 31, 2026. The company has no reported debt. The recent exploration program is funded, but the company remains dependent on equity capital over time.