Zacatecas Silver Expands Oso Negro to Over 3 Kilometres of Mapped Gold-Silver Veins; Phase Two Rock Chip Sampling Returns up to 20.3 g/t Gold and 3,480 g/t Silver
Zacatecas extends Oso Negro veins to 3km in Sonora, confirming drill-ready targets.
Zacatecas Silver Corp. announced Phase Two rock chip sampling results at its Oso Negro project in Sonora, Mexico. The program extended the mapped vein system to over 3 kilometres, confirming continuous gold-silver mineralization along the full 600-metre strike length of the Prospecto vein. Individual grab samples returned up to 20.3 g/t gold and 3,480 g/t silver, with 63 samples grading between 1 g/t and 20.3 g/t gold.
Geological textures indicate the uppermost levels of a low sulphidation epithermal system, suggesting a preserved boiling zone at depth. Both the Prospecto and Tere veins are now drill-ready, with drill plan designs and SEMARNAT permitting currently underway. The company plans to test targets with shallow, angled diamond drill holes, marking a transition from surface sampling to subsurface exploration.
Zacatecas Silver Corp. (ZAC) released news representing an expected, incremental step in the company's exploration roadmap at Oso Negro. This development directly follows the completion of Phase Two sampling in July 2026 and the subsequent $1.47M financing tranche closed in late July 2026, which was explicitly earmarked for the Oso Negro maiden drill program.
The results validate the geological model and confirm that the company is on track to submit drill permits and commence drilling as previously communicated. There is no new financial information, no change in capital requirements, and no unexpected catalysts. The market was already pricing in the progression from sampling to drilling.
Zacatecas Silver Corp. is a pre-revenue exploration company focused on silver and gold projects in Mexico. Its flagship Zacatecas Silver Project hosts the Panuco and El Cristo vein systems, which contain an inferred resource of 20.5 moz AgEq at Panuco. The company also holds the Esperanza Gold Project in Morelos, which features a Measured & Indicated resource of 1.15 moz AuEq. While the Esperanza project is optimized for a low-capex heap-leach operation, development is currently paused due to Mexican regulatory opposition to open-pit mining.
The company recently entered a definitive option agreement to acquire four exploration properties—Oso Negro, Cumaro, La Lola, and Ejutla—from Heliostar Metals, significantly expanding its Sonora and Oaxaca land package. Oso Negro is now the primary near-term catalyst, transitioning from surface sampling to maiden drilling.