Mr. Chris Wright reports

DEFIANCE SILVER DRILLING RETURNS UP TO 356 G/T AG AND 2.15 G/T AU IN ADDITIONAL SILVER AND GOLD STRUCTURES

Defiance Silver Corp. has provided 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 coming mineral resource estimate. This release contains results from holes DDSA-25-78 through DDSA-25-81, representing 1,486 metres of drilling. A total of 4,039 m of the 10,000-metre diamond drill program have been reported to date.

Highlights of results:

• DDSA-25-80 returned 1.20 metres of 356.00 grams per tonne silver and 2.15 g/t gold (from 106.85 m to 108.05 m) hosted within a larger interval of 11.02 m (100.78 m to 111.80 m) grading 125.41 g/t Ag and 0.81 g/t Au.
• DDSA-25-78 returned a 2.14-metre interval grading 111.12 g/t Ag from 267.96 m to 270.10 m, including 0.68 m of 208.00 g/t Ag (268.65 m to 269.33 m).
• DDSA-25-81 returned 2.63 m of 111.32 g/t Ag (from 417.12 m to 419.75 m), including 0.26 m of 543.00 g/t Ag (from 417.12 m to 417.38 m).

Discussion of results

Defiance announced the start of the drill program on Sept. 12, 2025. This release includes 1,486 m of drilling as part of a minimum 10,000-metre 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 hangingwall and footwall splays of the Veta Grande system, including the Veta Navidad.

Through surface mapping and drilling, the company has identified at least three blocks on the main Veta Grande structure. These blocks are delimited by major north-northwest-striking faults, where displacement of the veins, mineralization styles and hangingwall splays occurred. The displacement of the veins and vein structures in the main resource area can be estimated between 15 and 30 m.

The current blocks are being delimited by the San Jose and San Genaro faults. Systems are named as follows: the NW block, Central block and SE block. The NW block includes Carolina and Almaden pits, the Central block includes Esperanza and part of Guadalupe pits, and the SE block includes part of Guadalupe area to Refugio-Tiro Intermedio area.

Drill hole DDSA-25-78 was designed to test the continuity of the Veta Grande and hangingwall splays in the SE block of the resource area between drill holes DDSA-23-67 and DDSA-21-41. The hole cut a wide interval of well-developed Veta Grande vein and veinlet arrays on the hangingwall with some significant grades.

Drill hole DDSA-25-79 targeted an information gap between historical drill holes SAD95-21 and SAD95-22 about 60 m below surface. This drill hole encountered the projection of the mapped vein previously intersected by the holes described above; however, at this level, the vein is broken, missing and displaced by a fault zone.

Drilling of these two drill holes confirms that, in this area of the SE block, Veta Grande is well developed, especially at depth. In the very limited drilling done to date, this zone carries low-grade mineralization; however, the existence of significant grades was confirmed in narrow hangingwall structures.

Drill hole DDSA-25-80 is a twin of SAD95-16. Drill hole SAD-17-12 intersected a wide interval of mineralization that was not intercepted on drill hole SAD95-16; therefore, it was suspected the drill hole might have fallen short. Drill hole DDSA-25-80 targeted the near-surface Veta Grande structure, and the thickness and grades reported in the historical drill hole SAD-17-12 were confirmed.

Drill hole DDSA-25-81 was intended to test the downdip extension of mineralization intersected in drill hole DDSA-22-52. This drill hole intercepted a narrow, low-grade interval in Veta Grande, as well as some narrow veins and veinlet zones on the hangingwall.

Discussion of quality assurance/quality control and analytical procedure

Samples were selected based on the lithology, alteration and mineralization characteristics; sample size ranges from 0.25 to two m in width. All altered and mineralized intervals were sent for assay. One blank, one standard and one duplicate were included within every 20 samples. Standard materials are certified reference materials from OREAS and CDN that contain a range of silver, gold, copper, lead and zinc values. Blanks, standards and duplicates did not detect any issues with the analytical results.

Samples were analyzed by ALS Chemex Laboratories. Sample preparation was performed at the Zacatecas, Mexico, prep facility, and analyses were performed at the Vancouver, Canada, analytical facility. All elements except gold and mercury were analyzed by a multielement geochemistry method utilizing a four-acid digestion followed by ICP-MS detection. Mercury was analyzed after a separate aqua regia digest by ICP-MS. Overlimit assays for Ag, Pb and Zn were conducted using the OG62 method (multiacid digest with ICP-AES/AAS finish). Gold was measured by fire assay with an ICP-AES finish.

About Defiance Silver Corp.

Defiance Silver is an exploration company focused on advancing district-scale precious and base metal projects in Mexico. The company's portfolio includes: The Zacatecas project in the historic Zacatecas silver district, the 100-per-cent-owned Tepal gold-copper project in Michoacan and the Green Earth metals property portfolio in Sonora state. Defiance is led by a proven management and technical team with experience advancing exploration assets through discovery and development. The company is committed to capital-efficient exploration, disciplined growth and responsible development.

Qualified person statement

George Cavey, PGeo, is a qualified person within the meaning of National Instrument 43-101 and has approved the technical information concerning the company's material mineral properties contained in this press release.

We seek Safe Harbor.