Zacatecas Silver Announces Completion of Phase Two Sampling at Oso Negro, Sonora
Zacatecas confirms vein extensions at Oso Negro, advancing toward a near-surface drilling program.
Zacatecas Silver Corp. (ZAC) has completed Phase Two rock-chip grab sampling and vein mapping at its Oso Negro project in Sonora, Mexico. The company collected 391 samples primarily from vein outcrops and dispatched them to ALS for gold, silver, and base metal analysis.
Geological mapping identified 20 drill pad locations and confirmed extensive sulphidic quartz veins at the Prospecto and Tere systems, with veins reaching up to 3 meters in width. Additionally, the ecological studies required for SEMARNAT drill permit applications have been completed.
The company plans to submit drill permit applications shortly and will focus on near-surface drilling to test depth extensions of high-grade mineralization identified in Phase One, which included intercepts up to 14.8 g/t Au and 2,340 g/t Ag.
Zacatecas Silver Corp. (ZAC) released an update that serves as a routine, incremental follow-up to its June 9, 2026 sampling results and the June 8, 2026 option agreement to acquire the Heliostar portfolio. The announcement confirms the geological model and advances the permitting timeline for the Oso Negro project, though it does not include new assay data or financial results.
The market likely priced in this progression given the explicit drilling plans announced in June, and no material price impact is expected. The news aligns with management's stated 2026 priorities and does not alter the company's capital allocation or strategic trajectory.
Zacatecas Silver Corp. is an exploration-stage company focused on silver and gold projects in Mexico. Its flagship Zacatecas Silver Project features the El Cristo and Panuco vein systems. The Panuco property holds an inferred resource of 20.5 moz AgEq, while El Cristo targets high-grade silver-base metal extensions.
The company also holds the Esperanza Gold Project, an advanced, open-pit heap-leach oxide gold project with a Measured & Indicated resource of 1.15 moz AuEq. Development at Esperanza is currently paused due to Mexican regulatory opposition to open-pit mining.
Additionally, Zacatecas Silver recently acquired an option to purchase four exploration properties in the Heliostar Portfolio. The properties—Oso Negro, Cumaro, La Lola, and Ejutla—are located in Sonora and Oaxaca, expanding the company's district-scale land package.