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

VANCOUVER, British Columbia, Sept. 10, 2026 (GLOBE NEWSWIRE) -- Zacatecas Silver Corp. (TSXV: ZAC | OTCQB: ZCTSF | FRA: 7TV) (“Zacatecas Silver” or the “Company”) is pleased to announce assay results from the second phase of rock chip sampling at its Oso Negro project in Sonora, Mexico. Phase Two returned individual grab samples grading up to 20.3 g/t gold and 3,480 g/t silver, extended the mapped vein system to more than 3 kilometres, and confirmed continuous gold-silver mineralization along the full 600 metre strike length of the Prospecto vein. Both the Prospecto and Tere veins are now drill-ready with drill plan designs and permitting underway.