Mr. Nick Rodway reports

CORE SILVER DISCOVERS NEW COPPER PORPHYRY VEINS AT LAVERDIERE

Core Silver Corp. has confirmed the discovery of a new copper-bearing porphyry vein system at Copper Creek, part of the Laverdiere copper project, located on the eastern side of the company's Blue property in the Atlin mining district of northwestern British Columbia.

Highlights:

• In 2025, a new copper porphyry vein system was discovered along the lower section of Copper Creek, approximately 2.6 kilometres south of the Valley fault zone.
• Surface sample assays returned up to 1.35 per cent copper with 9.1 grams per tonne silver and 0.63 per cent copper with 17 grams per tonne silver and 355 parts per million molybdenum, with multiple additional samples yielding anomalous Cu-Mo-Ag values.
• Steeply dipping malachite-chalcopyrite-bearing veins and fractures at Copper Creek are locally crosscut by epithermal-style quartz-carbonate veining, indicating the presence of a multiphase, robust hydrothermal system.
• Similar vein relationships are observed 1.8 kilometres west at Upper Copper Creek, where more intense epithermal stockwork veining has been sampled (assays pending) as well as along the Valley fault.
• With this discovery, Cu-Mo-Ag mineralization is confirmed across 4.5 kilometres at Laverdiere, extending from the Main copper skarn zone (North adit) to Copper Creek, and remains open for expansion in all directions.
• Additional results from the 2025 exploration program, including drilling, will be released as they become available.

Core Silver's president and chief executive officer, Nick Rodway, commented: "The discovery of a new copper porphyry vein system at Copper Creek marks an important step forward in demonstrating the true scale of the Laverdiere system. It is only our second drill season at Laverdiere, and we are seeing strong copper, molybdenum and silver mineralization over 4.5 kilometres -- a footprint that is rarely seen at this scale, during this stage of exploration in British Columbia. These strong surface results, combined with ongoing deep drilling at the Valley zone, reinforce our view that the Blue property hosts a district-scale copper-molybdenum-silver system capable of generating significant long-term value."

About the Copper Creek discovery

In 2025, early prospecting at the Laverdiere copper project led to the discovery of a new copper-bearing porphyry-style vein and fracture system along the lower section of Copper Creek, located approximately 2.6 kilometres south of the 2025 drilling area situated along the Valley fault zone. Samples collected from this vein system early in the 2025 season returned 0.63 per cent Cu with 17 g/t Ag and 355 parts per million Mo, which warranted detailed mapping and systematic sampling of the area -- including Upper Copper Creek. Structural mapping in early July delineated the mineralized vein and fracture system for just over 200 metres of strike length, and 10 additional samples were collected from a combination of steeply dipping copper-bearing porphyry veins and exposed fracture/fault surfaces, as well as a crosscutting felsic dike and late, rusty epithermal-style quartz-carbonate veins. Chalcopyrite-malachite-bearing porphyry veins and fractures sampled during this time returned significant grades including values of up to 1.35 per cent Cu and 9.1 g/t Ag, with several additional samples yielding anomalous Cu-Mo-Ag concentrations.

Comparable relationships between porphyry and epithermal veining have also been observed 1.8 kilometres west at Upper Copper Creek -- where more intense epithermal stockwork veining has been sampled (assays pending) -- and along the Valley fault zone. With this latest discovery, the Cu-Mo-Ag footprint has been confirmed for over approximately 4.5 kilometres, extending from the Main copper skarn zone (North adit) to Copper Creek. Cu-Mo-Ag porphyry mineralization at the Laverdiere copper project is concentrated in fault splays and areas of increased structural complexity and hydrothermal alteration associated with the Llewellyn fault zone. Currently, this district-scale target remains open for expansion in all directions.

About the Laverdiere copper project

The Laverdiere copper project is a low-elevation, drill-permitted, early-stage high-grade copper-molybdenum-silver-gold porphyry-skarn target. The project has been sporadically explored since the early 1900s, without ever having received a significant exploration program. Adits driven into the Laverdiere area in the early 1900s reportedly returned up to 27 metres grading 1.20 per cent Cu. The Llewellyn fault zone, a regional and strongly metal-endowed fault, cuts through the Laverdiere copper project for 14 kilometres of strike length, and marks the contact between the Yukon-Tanana and Stikine terranes in the project area. Currently, only one km of the total strike length of this economically important fault zone has been explored. Diamond drilling completed 125 m north of the French adit in 1974 reportedly returned 175 m of 0.27 per cent Cu, including six m of 1.60 per cent Cu and 7.8 m of 1.60 per cent Cu. Core Silver's inaugural diamond drilling campaign at the Laverdiere copper project in 2022 returned up to 48.5 m of 0.90 per cent Cu, six grams per tonne Ag and 0.11 g/t Ag from a 31.46-metre depth in drill hole LAV22-001 (French adit), 223 m of 0.11 per cent Cu, two g/t Ag and 0.006 per cent Mo from a 15-metre depth in LAV22-002 (French adit), and 107.38 m of 0.11 per cent Cu, 0.023 per cent Mo, 0.9 g/t Au and 0.02 g/t Au from a 144.62-metre depth in hole LAV22-006 (North adit). The entirety of the 2022 Laverdiere program results are summarized in the news release dated March 29, 2023.

Drilled and mapped high-grade copper-bearing skarn mineralization at Laverdiere is coincident with embayments in the contact zones of the expansive Cretaceous intrusion on the west side of Hoboe Creek. A large unexplored embayment in the intrusion is mapped eight km to the south of the to-date explored zone at Laverdiere and is in contact with Boundary Range metamorphic rocks at this location. Apophyses of the larger granodiorite intrusion are also mapped in contact with limestone and marbles amenable to massive sulphide skarn mineralization approximately seven km to the southwest of the known zones of high-grade porphyry-skarn mineralization.

At Laverdiere, an extensive Cretaceous granodiorite intrusion hosts widespread Cu-Mo-Ag plus or minus Au porphyry mineralization. The intrusion is associated with a very high-grade iron-copper-gold-silver massive sulphide skarn occurrence (the Main zone) that is exposed at surface along the western flank of the prolific Llewellyn fault zone at the porphyry marble contact. The Main zone was drill-tested in 2022 and returned significant copper grades over extensive widths including: 267.05 m of 0.17 per cent Cu, one g/t Ag and 0.04 g/t Au from surface, including 48.54 m of 0.90 per cent Cu, six g/t Ag and 0.11 g/t Au from a 31.46-metre depth.

In 2024, high-grade porphyry Cu-Mo-Ag plus or minus Au mineralization at the newly defined Valley zone, located 2.2 km southwest of the Main zone, was structurally mapped and sampled. At the Valley zone, a series of sheeted mineralized porphyry veins and fractures hosted in altered granodiorite has been mapped and sampled over a one-kilometre east-west trend following the Valley fault that historically returned up to 3.24 per cent Cu (with 82 g/t Ag, 0.56 g/t Au and 0.053 per cent Mo) and 0.32 per cent Mo (with 1.03 per cent Cu and four g/t Ag) in 2022. In 2024, a 20-centimetre-thick east-west-striking quartz vein grading 0.83 per cent Cu, 47 g/t Ag, 0.44 g/t Au and 0.007 per cent Mo was discovered on the opposite side of the Valley fault.

Sampling, preparation and quality assurance/quality control

All 2025 rock and drill core samples are transported by helicopter at the end of each field day to the core logging facility in Atlin, B.C., for processing. Field samples were chosen to capture homogenous lithology, alteration, mineralization and veining. All rock and drill core samples are submitted to Bureau Veritas Labs in Whitehorse, Yukon. Each sample is crushed to 70 per cent passing two millimetres, then pulverized to 85 per cent passing 200-micron mesh. All samples then undergo a four-acid digestion with an ICP-MS finish for a 59-element ultratrace package (method code MA-250), as well as fire assay by lead collection with ICP-ES finish for gold, platinum and palladium (method code FA-330). Samples that hit upper detection limits for elements of interest on the primary multielement method are further analyzed through a secondary four-acid digest with an ICP-OES finish (method code MA-370). Extremely high-grade Pb samples were analyzed through a tertiary overlimit method, GC-817.

National Instrument 43-101 disclosure and data verification

Nicholas Rodway, PGeo, (licence No. 46541) (permit to practice No. 100359) is chief executive officer and director of the company, a qualified person as defined by National Instrument 43-101 (Standards of Disclosure for Mineral Projects). Mr. Rodway has reviewed and verified, to the best of his knowledge, the scientific and technical data in this news release. Verification included review of field notes, sample tags and analytical certificates from Bureau Veritas Labs, and comparison of results with original data sets. No limitations were noted during the verification process.

About Core Silver Corp.

Core Silver is a Canadian mineral exploration company focused on the acquisition and development of mineral projects in British Columbia, Canada. The company currently holds 100-per-cent ownership in the Blue property mineral tenure, which covers a land area of 114,074 hectares (approximately 1,140 square kilometres). The project lies within the Atlin mining district, a well-known gold mining camp located in the unceded territory of the Taku River Tlingit First Nation and the Carcross/Tagish First Nation. The Blue property hosts a major structural feature known as the Llewellyn fault zone. This structure is approximately 140 km in length and runs from the Tally-Ho shear zone in the Yukon, south through the Blue property to the Alaskan Panhandle Juneau ice sheet in the United States. Core Silver believes that the south Atlin Lake area and the LFZ have been neglected since the last major exploration campaigns in the 1980s. The LFZ plays an important role in mineralization of near-surface metal occurrences across the Blue property mineral tenure. The past 50 years have seen substantial advancements in the understanding of porphyry, skarn and carbonate replacement type deposits both globally and in British Columbia's Golden Triangle. The company has leveraged this information at the Blue property mineral tenure to tailor an already proven exploration model and believes this could facilitate a major discovery. Core Silver is excited to become one of Atlin mining district's premier explorers where its team believes there are substantial opportunities for new discoveries and development in the area.

We seek Safe Harbor.