Defiance Silver Drilling Returns up to 356 g/t Ag and 2.15 g/t Au in Additional Silver and Gold Structures

Vancouver, British Columbia--(Newsfile Corp. - May 11, 2026) - Defiance Silver Corp. (TSXV: DEF) (FSE: D4E) (WKN: A1JQW5) ("Defiance" or the "Company") is pleased to provide an update on the current drilling campaign at the Zacatecas Project. The campaign was designed to confirm the extension of the known mineralized structures both laterally and vertically as well as to validate the current geological model that will be used for the upcoming Mineral Resource Estimate. This release contains results from holes: DDSA-25-78 through DDSA-25-81, representing 1,486m of drilling. A total of 4,039m of the 10,000m diamond drill program has been reported to date.

HIGHLIGHTS OF RESULTS

• DDSA-25-80 returned 1.20m of 356.00 g/t Ag and 2.15 g/t Au (from 106.85m to 108.05m) hosted within a larger interval of 11.02m (100.78m to 111.80m) grading 125.41 g/t Ag and 0.81 g/t Au.

• DDSA-25-78 returned a 2.14m interval grading 111.12 g/t Ag from (267.96m to 270.10m). including 0.68m of 208.00 g/t Ag (268.65m to 269.33m).

• DDSA-25-81 returned 2.63m of 111.32 g/t Ag (from 417.12m to 419.75m) including 0.26m of 543.00 g/t Ag (from 417.12m to 417.38m).

Overview Map of Drill Locations

Figure 1. Overview Map of Drill Locations. Plan map of the San Acacio project area. Drill holes reported in this release are shown with yellow collars and traces, with selected highlights in boxes. Coordinates are in UTM WGS84 Zone 13N.

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Simplified Cross Section, Looking NW, with New Results from Hole DDSA-25-80

Figure 2. DDSA-25-80 Simplified Cross Section, looking NW

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Table of Results

Table 1. Table of Results. True thickness is assumed to be 50% - 80% of downhole width.

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DISCUSSION OF RESULTS

Defiance announced the start of the drill program on September 12, 2025. This release includes 1,486m of drilling as part of a minimum 10,000m drill program designed to collect additional data in the San Acacio historical resource area. These holes were designed to improve the main Veta Grande structural model and to infill poorly drilled zones, as well as to test both hanging wall and footwall splays of the Veta Grande system, including the Veta Navidad.

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