Vancouver, British Columbia — December 9, 2025 — Leads & Copy — IMPACT Silver Corp. (TSXV: IPT) (OTCQB: ISVLF) (FSE: IKL) has announced further results from its underground drill program in the Santo Domingo Zone at its Plomosas zinc (lead-silver) Mine in northern Mexico.
New drill intersections from the Santo Domingo Zone of the Plomosas Mine include:
Hole No. UGSD-2509:
- 13.10 to 13.60 meters: 0.50 meters interval with estimated true width of 0.47 meters, 12.75% Zinc, 0.82% Lead, 9.50 g/t Silver, 13.63% ZnEq
- 71.60 to 72.00 meters: 0.40 meters interval with estimated true width of 0.38 meters, 15.65% Zinc, 1.54% Lead, 11.90 g/t Silver, 17.02% ZnEq
- 81.55 to 81.95 meters: 0.40 meters interval with estimated true width of 0.38 meters, 3.67% Zinc, 8.26% Lead, 20.30 g/t Silver, 8.98% ZnEq
Hole No. UGSD-2511:
- 36.25 to 37.10 meters: 0.85 meters interval with estimated true width of 0.84 meters, 26.30% Zinc, 6.45% Lead, 34.70 g/t Silver, 31.33% ZnEq
Hole No. UGSD-2512:
- 29.40 to 31.47 meters: 2.07 meters interval with estimated true width of 2.07 meters, 10.60% Zinc, 9.43% Lead, 24.00 g/t Silver, 16.70% ZnEq
- 55.05 to 60.00 meters: 4.95 meters interval with estimated true width of 4.95 meters, 13.83% Zinc, 7.43% Lead, 22.99 g/t Silver, 18.83% ZnEq
- Including 56.37 to 57.70 meters: 1.33 meters interval with estimated true width of 1.33 meters, 18.25% Zinc, 11.30% Lead, 29.10 g/t Silver, 25.57% ZnEq
Hole No. UGSD-2513:
- 19.68 to 20.30 meters: 0.62 meters interval with estimated true width of 0.58 meters, 20.30% Zinc, 18.25% Lead, 45.30 g/t Silver, 32.05% ZnEq
- 25.98 to 26.60 meters: 0.62 meters interval with estimated true width of 0.58 meters, 16.90% Zinc, 7.76% Lead, 26.20 g/t Silver, 22.22% ZnEq
- 56.60 to 59.95 meters: 3.35 meters interval with estimated true width of 3.15 meters, 5.04% Zinc, 5.06% Lead, 8.85 g/t Silver, 8.12% ZnEq
- Including 56.60 to 57.63 meters: 1.03 meters interval with estimated true width of 0.97 meters, 12.45% Zinc, 7.89% Lead, 20.10 g/t Silver, 17.55% ZnEq
Hole No. UGSD-2515:
- 50.84 to 51.60 meters: 0.76 meters interval with estimated true width of 0.54 meters, 9.16% Zinc, 4.98% Lead, 10.70 g/t Silver, 12.29% ZnEq
Zinc Equivalent (ZnEq) was calculated using metal prices of US$1.47/lb Zn, US$0.92/lb Pb and US$50.44/oz Ag, and metal recoveries of 90.5% Zn, 76.5% Pb, and 85.0% Ag based on recent Plomosas production mill recoveries.
True width estimates are interpreted from current geological models. Drill holes UGSD-2510 and UGSD-2514 reported no results because they encountered open space through previously unknown old mine workings. The Santo Domingo Zone mineralization remains open for exploration.
President and CEO Frederick Davidson said drilling on the Santo Domingo Zone continues to return high-grade results, extending the zone to the northeast. He added that the location of these new intersections on extensions of current active mine workings allows for rapid and low-cost access and mine development. Drilling is continuing to define additional mineralization in the Plomosas mine area, as well as nearby greenfields exploration targets.
The Plomosas mine was acquired in 2023. Recent drill programs have been undertaken on extensions of active mine areas in the Tres Amigos Zone, the Juarez Zone and Santo Domingo Zone. Mineralization at the Plomosas mine occurs as zinc-rich Carbonate Replacement zones in three bedrock units – the Mina Vieja marble (Tres Amigos Zone), the Juarez limestone (Juarez Zone) and in carbonate layers within the Cuesta Shale (Santo Domingo Zone).
IMPACT Silver Corp. (TSXV: IPT) is a producer-explorer with two mining projects in Mexico.
Royal Mines of Zacualpan Silver-Gold District: IMPACT owns 100% of the 211 km2 Zacualpan project in central Mexico where four producing underground silver mines and one open pit mine feed the central 500 tpd Guadalupe processing plant. The Capire Project includes a 200 tpd processing pilot plant adjacent to an open pit silver mine with an NI 43-101 inferred mineral resource of over 4.5 million oz silver, 48 million lbs zinc and 21 million lbs lead (see IMPACT news release dated January 18, 2016, for details and QP statement). Company engineers are reviewing Capire for a potential restart of operations.
Plomosas Zinc-Lead-Silver District: Plomosas is a high-grade zinc producer in northern Mexico with exploration upside potential. In late 2023, the Company restarted mining operations and is ramping up production. Exploration potential at Plomosas is exceptional along the 6 km-long structure. This is in addition to other exploration targets on the 3,019-hectare property including copper-gold targets with indications of high-grade material at surface. Plomosas lies in the same belt as some of the largest carbonate replacement deposits in the world.
Drill core was NTW size (5.71 cm diameter). Half core samples were collected with a rock saw and tagged for identification. All samples were securely stored at the Plomosas Mine until shipment. A total of 5% certified assay standards and 5% blanks were inserted into every sample shipment as a quality control measure. All samples were shipped to the ALS preparation laboratory in Chihuahua, Mexico, where they were fine crushed (70% passing a 2 mm screen), pulverized (85% passing a 75 micron screen) and pulp split separated for assay. These pulps were shipped to the ALS laboratory in North Vancouver, Canada, where a 10 gram split was aqua regia digested and then analyzed for 36 elements including zinc, lead and silver by ICP-AES spectrometry (ALS code ME-ICP41). Assays for base metals >1% used an overlimit ICP-AES method (ALS code OG46). ALS is an independent, international ISO/IEC 17025 accredited laboratory.
Silvia Kohler, P. Geo., a Senior Geologist employed by IMPACT Silver Corp. and a “Qualified Person” within the meaning of NI-43101, has approved the technical information contained in this news release.
For more information, please contact Jerry Huang, CFO | Investor Relations at O: (604) 664 7707 or inquiries@impactsilver.com, C: (778) 867 7909 Direct.
Source: IMPACT Silver Corp.
