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Zacatecas Silver Reports High-Grade Gold and Silver Surface Sampling over 2 Km Strike Length At Oso Negro, Sonora
Zacatecas Silver Corp. announced the assay results from the initial rock-chip sampling program at the Oso Negro project, located in Sonora, Mexico. The program was completed in March 2026 and samples were assayed by ALS (see Company News Release April 16, 2026). Highlights of the Sampling Program: Up to 14.8 g/t Au and 2,340 g/t Ag returned from surface rock-chip sampling at Oso Negro, Sonora, •39 of 134 vein samples assayed above 1 g/t Au; 35 samples above 100 g/t Ag, with strong correlation between gold, silver, lead, and zinc across the vein system, •High-grade results confirmed across a minimum 2 km combined strike length on two veins, demonstrating system-scale continuity, •Samples were collected above the boiling zone where grades are expected to be lowest in a low sulphidation epithermal system - indicating the highest-grade portion of the system remains untested at depth, •Three outcropping low sulphidation veins identified, up to 3 m wide, multiphase and brecciated, consistent with a well-developed epithermal system One hundred and fifty-six rock-chip grab samples were collected from three outcropping low sulphidation veins with a cumulative strike length of over 2 km. Of these, 134 samples were collected directly from vein outcrop; the remaining 22 were orientation samples collected from host rocks distal to the veins. Veins are up to 3 m wide, multiphase, with common vein breccias and pervasive iron oxides after sulphides. Of the 134 vein samples, 39 assayed between 1 g/t Au and 14.8 g/t Au, 35 assayed between 100 g/t Ag and 2,340 g/t Ag, and 11 assayed over 1% combined lead and zinc. Gold, silver, lead, and zinc show strong positive correlation throughout the sample population. High-grade results were returned across the full strike length of the Prospecto Vein and over approximately 1 km of the Tere Vein. The significance of these results is amplified by three geological factors. First, quartz vein textures and mineralogy confirm that samples were collected from the uppermost levels of the low sulphidation system - above the boiling zone where precious metal deposition is concentrated. Second, many samples were partially oxidized and leached at surface, conditions that typically suppress assay values relative to fresher material at depth. Third, despite these factors, anomalous gold and silver grades were returned consistently across the full 2 km strike length of the system. Taken together, the results indicate that the highest-grade portion of the Oso Negro system remains intact and untested below the current sampling interval. Vein textures are typical of the uppermost levels of a low sulphidation epithermal system. Where the boiling zone is preserved at depth, precious metal mineralization is expected to be present. The Company considers Oso Negro a compelling drill target. The Company is advancing Oso Negro on an accelerated timeline. High-resolution multispectral satellite imagery has been commissioned to provide a structural and alteration base map, which will guide an extensive follow-up rock-chip and channel sampling program to be conducted concurrently. The Company intends to submit a drill permit application to SEMARNAT before the end of June 2026.