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

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Both the Prospecto and the Tere veins are drill-ready and the Company will provide an update on the planned diamond drill program shortly. The high-grade gold and silver assays returned from outcropping rock chip samples define robust exploration targets that can be tested initially with shallow, angled diamond drill holes.

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Figure 1: Oso Negro Phase One and Two Combined Rock Chip Sample Locations and Silver Grade Map

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Figure 2: Oso Negro Phase One and Two Combined Rock Chip Sample Locations and Gold Grade Map

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CEO Quote

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“Phase Two did two things for us at Oso Negro – it extended the system to over three kilometres of mapped veins, and it confirmed the Prospecto Vein carries gold and silver along its entire 600-metre strike,” said Eric Vanderleeuw, Chief Executive Officer and Director. “This is an undrilled system showing the surface signature of a preserved low sulphidation target, and Prospecto and Tere are where we want to start. With Cumaro advancing alongside it, Sonora is becoming a significant part of our story, and with our recent financing we have the means to advance it.”

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Analytical Methods and QA/QC
Rock chip samples were collected and bagged under the supervision of Company personnel following standard industry practices. Samples were submitted to ALS Zacatecas for analysis. Samples were prepared by drying, sieving and pulverizing, and analyzed for Ag and a suite of elements by multi-element ICP methods following four-acid digestion. The Company inserted certified reference materials, blanks and field duplicates into the sample stream to monitor analytical quality.

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Qualified Person
The technical information in this news release has been reviewed and approved by Chris Wilson, B.Sc. (Hons), PhD, FAusIMM (CP), FSEG, FGS, Chief Geologist of Zacatecas Silver. Dr. Wilson is a Qualified Person as defined by NI 43-101 and is not independent due being Chief Geologist and a director.

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About Zacatecas Silver Corp.

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Zacatecas Silver is a multi-asset precious metals exploration company with a portfolio of six projects across Mexico, spanning Zacatecas, Sonora, Morelos, and Oaxaca.

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The Zacatecas Silver Project is located in Zacatecas State, within the highly prospective Fresnillo silver belt, which has produced over 6.2 billion ounces of silver. The Company holds 7,826 hectares of ground prospective for low-sulphidation and intermediate-sulphidation silver-base metal mineralization. A Mineral Resource Estimate at the Panuco deposit comprises 3.41 million tonnes at 187 g/t AgEq for 20.5 million ounces AgEq (see news release dated May 31, 2023). The property is 25 km southeast of MAG Silver’s Juanicipio Mine and Fresnillo PLC’s Fresnillo Mine, and shares boundaries with Defiance Silver and Endeavour Silver.

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Esperanza is an advanced stage, attractive low-cost, low-capital-intensity and low-technical-risk growth project located in Morelos state, Mexico. The Company announced a Mineral Resource Estimate at Esperanza consisting of a Measured and Indicated Mineral Resource Estimate of 45.4 million tonnes at 0.79 g/t AuEq (0.76 g/t gold and 8.5 g/t silver) for 1.15 million ounces AuEq (1.11 million ounces gold and 12.37 million ounces silver) and an Inferred Mineral Resource Estimate of 11.2 million tonnes at 0.57 g/t AuEq (0.53 g/t gold and 11.2 g/t silver) for 208 thousand ounces AuEq (190 thousand ounces gold and 4.02 million ounces silver) (see news release dated June 22, 2026).

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The Company also holds four exploration properties in Sonora and Oaxaca. Oso Negro (Sonora) is an undrilled, high-grade low sulphidation epithermal system with multiple veins mapped over more than 3 km of strike length. Cumaro (Sonora) is situated along trend from Coeur Mining’s El Picacho development and hosts extensions of proven low sulphidation vein systems with high-grade channel sampling results. La Lola (Sonora) is a large, underexplored 1,183-hectare property anchored by the La Barra vein, a 5 km structure reaching up to 40 m in width. Ejutla (Oaxaca) comprises 10,603 hectares in the Taviche-Miahuatlán region near the former Fortuna Silver San José Mine, hosting multiple vein systems and alteration zones anomalous in gold, silver, and Carlin-style pathfinder elements.