Defiance Silver posts high-grade drill results at San Acacio, Mexico

Defiance Silver Corp. [TSXV: DEF; FSE: D4E; WKN: A1JQW5] provided an update on the current drilling campaign at the Zacatecas Project, Mexico. 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.

The company continues to consistently encounter high grade silver mineralization in multiple mineralized zones with lateral and vertical continuity in the Veta Grande system. This release contains results from five holes: DDSA-25-73 through DDSA-25-77, representing 2,553 metres of the 10,000-metre diamond drill program that began September 12, 2025. The company has completed 12 drill holes to date and additional drill holes will be reported as the company receives the analytical results.

Highlights: DDSA-25-76 returned 3.55 metres of 355.32 g/t Ag (from 176.38m to 179.93m) within a 22.57-metre interval grading 102.91 g/t silver from (179.93m to 198.95m). This hole also returned 3.07 metres of 579.27 g/t Ag (from 209.15m to 212.22m), including 0.55 metres of 2120 g/t Ag (from 209.15m) within a wider interval returning 10.65 metres grading 210.70 g/t Ag from (209.15m to 219.80m).

DDSA-25-77 returned 3.01 mteres of 262.88 g/t Ag (from 286.18m to 289.19m), including 1.75 metres of 431.58 g/t Ag (from 286.18 to 287.93m) with 0.37 metres of 1965 g/t Ag (from 286.18m to 286.55m), all hosted within a larger interval of 6.77 metres (from 286.18m to 292.95m) grading 128.69 g/t Ag.

DDSA-25-75 returned 2.35 metres of 298.58 g/t Ag (from 255.17m to 257.52m), including 0.36 metres of 1,595 g/t Ag (from 255.17m to 255.53m) within a 5.20-metre interval grading 149.25 g/t Ag (from 252.32m to 257.52m).

The information presented in this release includes approximate 2,553 metres of drilling of a minimum 10,000-metre drill program designed to collect additional data in the San Acacio proposed mineral 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 mineralized hanging wall and footwall splays to the Veta Grande system. High grade results over wide widths were encountered in Holes DDSA-25-75, 25-76 and 25-77.

Through surface mapping and drilling, the company has been able to identify at least three blocks on the main Veta Grande structure, these blocks are delineated by major N-NW striking faults, where displacement of the veins, mineralization styles and vein splays occur. The displacement of the vein in the area of the upcoming mineral resource estimate, can be approximately 15 metres to 30 metres.

The current blocks are being delineated by the San José and San Genaro Fault systems and are named as follows: NW block, Central block and SE block. NW block includes significant past producing Carolina and Almaden Pits. The Central block includes the past producing Esperanza pit and part of Guadalupe Pits, one of the largest past producing open pits at San Acacio. The SE block is part of Guadalupe to Refugio-Tiro Intermedio area.

DDSA-25-73: Re-entered historical drill hole SAD-17-29, an older drill hole that ended before reaching the Veta Grande structure; by re-entering, the company was able to prove the continuity of the Veta Grande structure on the SE block. Although the Veta Grande structure was intercepted and some silver values were detected, the hole returned no results >100ppm Ag.

DDSA-25-74: Re-entered DDSA-21-48 The Veta Grande structure was intercepted, and some silver values were detected; the hole returned no results >100ppm Ag.

DDSA-25-75: The first objective was to better define the width of Veta Navidad and further down hole, drill through high grade veinlets arrangements and then intersect the Veta Grande. The intercept of Veta Navidad in this drill hole, which was designed to cut through the vein perpendicularly, is only 0.8 metres, which confirms that it is indeed a narrow subvertical structure. The hole was successful in identifying high grade veinlet arrays between the Veta Navidad and the Veta Grande.

DDSA-25-76: Infill drill hole that 76 targeted the intersection of Veta Grande with hanging wall splays that create a mineralized shoot below the past-producing Esperanza Pit area that is coherent with a wide mineralized vein at surface. The highest values correspond to one of the modelled mineralized splays in Veta Grande vein system.

DDSA-25-77: Re-entered historical drill hole SAD-17-30A which previously encountered drilling problems and did not intercept Veta Grande when it was drilled in 2017. This drill hole targeted SE block hanging wall splays and the Veta Grande. Hole 77 was successful in intercepting the Veta Grande but with low grades. The wide intercepts with high grades correspond to widely mineralized veinlet zones both in both the hanging wall and footwall of the Veta Grande. The company believe that these wide, mineralized, array zones have the potential to add ounces to the upcoming resource estimate.

Defiance Silver is advancing the district-scale Zacatecas project, located in the historic Zacatecas Silver District, the 100%-owned Tepal Gold/Copper Project in Michoacán state, Mexico and the newly acquired Green Earth Metals property portfolio in Sonora State.