Zacatecas Silver (ZAC.V) completed second phase of rock chip grab sampling and vein mapping at the Oso Negro project, in Sonora, Mexico, it said Thursday.
The samples from the program have been dispatched for gold, silver and base metal analysis, said the company.
Additional vein extensions at both the Prospecto and Tere vein low sulphidation epithermal systems were identified through geological mapping during phase two exploration, it said.
The phase two program confirmed the presence of extensive sulphidic quartz veins, added Zacatecas Silver.