Mr. Nicholas Rodway reports

CORE SILVER RELEASES FIRST VISUALS FROM DRILLING AT THE LAVERDIERE COPPER PROJECT

Core Silver Corp. has provided visuals showcasing representative porphyry copper-molybdenum-silver (Cu-Mo-Ag) mineralization intersected in drill hole LAV25-010, the first of four deep exploratory diamond drill holes completed during the 2025 season at the Laverdiere copper project, located on the eastern Blue property in the Atlin mining district, northwestern British Columbia.

The company's 2025 exploration program was designed to test the depth potential and continuity of a large (five kilometres (km) by eight km) multiphase porphyry system through diamond drilling, structural mapping and surface sampling. In total, seven drill holes were completed across five locations along the Valley fault zone, totalling 3,857 metres (m) (table 1).

LAV25-010 highlights -- confirmation of a large, zoned porphyry system*:

• LAV25-010 intersected zones of Cu-Mo-Ag mineralization and associated porphyry-style alteration from surface to over 675 m drilled depth at the Valley zone.
• The hole was collared 1.8 km southwest of previously drilled molybdenite-chalcopyrite-pyrite mineralization at the north adit (LAV22-006), and confirms the presence of a laterally and vertically zoned, multiphase porphyry system extending to depth and linked to an exposed high-grade iron-copper-molybdenum-gold skarn occurrence.
• Observed alteration and mineralization styles are interpreted to represent marginal zones of a copper-molybdenum-silver-rich orebody that remains open laterally and at depth.
• Drilling and structural mapping have now traced porphyry-style Cu-Mo-Ag-plus-or-minus-gold (Au) mineralization at Laverdiere for over 4.5 kilometres, from the north adit (main skarn zone) to Lower Copper Creek, and across multiple east-west fault splays spanning more than 2.5 km.
• The Laverdiere copper project represents a significant new porphyry discovery at the tip of the Stikine terrane in an underexplored northern mineral district, effectively bridging the gap between British Columbia's Golden Triangle and Yukon's Tintina gold belt.

* Assay results for all intervals described herein are pending and visual estimates of mineral abundance should not be considered representative of grade.

Core Silver's president and chief executive officer, Nick Rodway, commented:

"Drill hole LAV25-010 provides our clearest view yet into the scale of the porphyry system at Laverdiere. To see zones of impressive copper, molybdenum and silver mineralization from surface to over 675 metres in our first deep hole is extremely encouraging. The visual evidence at Valley points to a large, multiphase porphyry system that has the potential to evolve into a significant copper-silver-molybdenum system in the Atlin mining jurisdiction. We look forward to sharing additional visuals followed by assay results as they become available."

An overview of drill hole LAV25-010

Drill hole LAV25-010, the first deep exploratory diamond drill hole completed at the Laverdiere copper project in 2025, was designed to test the depth extent and continuity of Cu-Mo-Ag mineralization associated with the Valley fault zone. This major structural corridor had previously returned surface assays of up to 366 grams per tonne silver (g/t) Ag, 0.71 per cent Cu and 0.54 per cent Mo earlier in the 2025 season. The hole was drilled steeply to the northeast across the Valley fault to a final depth of 703 m.

From surface, LAV25-010 intersected a broad oxidized zone containing early quartz-vein hosted molybdenite and chalcopyrite mineralization (plus or minus pyrite plus or minus bornite), locally overprinted by late silver-bearing sulphosalt and specular hematite-molybdenite veins and breccias. Epithermal quartz-carbonate veins are abundant throughout the upper section and appear to represent a later, mineralization-remobilizing overprint that partially modified earlier porphyry mineralization. Below the oxidized horizon, molybdenum mineralization persists with copper (chalcopyrite plus or minus bornite), which becomes locally increasingly abundant, coarser grained and hosted in thicker vein sets with depth. This vertical zonation, from silver-molybdenum-dominant mineralization near surface to molybdenum-plus-copper-rich chalcopyrite-bornite mineralization at depth, is a characteristic of productive porphyry copper systems.

Specular hematite-bearing breccias also exhibit clear zonation, becoming progressively molybdenite plus or minus tourmaline plus or minus biotite rich with depth. This mineralogical transition suggests the ore-forming fluids evolved from oxidized to reduced conditions and that the drill hole likely intersected a fertile portion of the Laverdiere porphyry system.

The mineralogical and structural relationships observed in LAV25-010 confirm that the hole intersected the upper and marginal zones of a large, multiphase Cu-Mo-Ag porphyry centre. Between zones of increased porphyry style alteration and mineralization at depth, late to postmineral phases of the Laverdiere porphyry were encountered. The system remains open at depth and along strike.

About the Laverdiere copper project

The Laverdiere copper project is a low-elevation, drill-permitted, early-stage high-grade Cu-Mo-Ag-Au porphyry-skarn target. The project has been sporadically explored since the early 1900s, without ever having received a significant exploration program. At Laverdiere, an extensive Cretaceous granodiorite intrusion hosts widespread Cu-Mo-Ag-or-minus-Au porphyry mineralization. The intrusion is associated with a very high-grade Fe-Cu-Au-Ag (iron-copper-gold-silver) massive sulphide skarn occurrence that is exposed at surface along the western flank of the prolific Llewellyn fault zone (LFZ) at the porphyry-marble contact.

Adits driven into the Laverdiere area in the early 1900s reportedly returned up to 27 m 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 km of strike length, and marks the contact between the Yukon-Tanana and Stikine terranes in the project area. Historical and shallow 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 g/t Ag and 0.11 g/t Au from 31.46 m 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 15 m 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 Ag and 0.02g/t Au from 144.62 m depth in hole LAV22-006 (north adit).

Drilled and mapped high-grade copper-bearing skarn mineralization at Laverdiere is coincident with embayments in the contact zones of the expansive Cretaceous intrusions 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.

In 2024, high-grade porphyry Cu-Mo-Ag-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 have been mapped and sampled over a one km 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 (cm) 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 and quality control (QA/QC)

All 2025 rock and drill core samples were 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 (BV) Labs in Whitehorse, Yukon. For drill core, blanks and certified reference standard materials were inserted for every 20 core samples. Lab duplicate requests were inserted into the core sample sequence every 50 samples. Each rock and core sample is crushed to 70 per cent passing two millimetres (mm), then pulverized to 85 per cent passing a 200-micron mesh. All samples then undergo a four-acid digestion with an ICP-MS (inductively coupled plasma mass spectrometry) finish for a 59-element ultratrace package (method code MA-250), as well as fire assay by Pb (lead) collection with ICP-ES (inductively coupled plasma emission spectroscopy) finish for Au, Pt (platinum) and Pd (palladium) (method code FA-330). Samples that hit upper detection limits for elements of interest on the primary multielement method are further analyzed via a secondary four-acid digest with an ICP-OES (inductively coupled plasma optical emission spectroscopy) finish (method code MA-370). Extremely high-grade Pb samples were analyzed via a tertiary overlimit method, GC-817.

Soil samples collected in 2025 were also transported by helicopter at the end of each field day. Samples were photographed in the field, and sample descriptions included the sample number, location, elevation, colour, saturation, depth of sample and soil horizon. Samples were dried in kraft sample bags on site prior to being batched for shipment to BV Labs in Whitehorse, Yukon. There, each sample is dried at 60 C and sieved to pass minus 180 microns (80 mesh). All samples then undergo an aqua regia extraction with an ICP-ES/MS finish for a 36-element package (method code AQ200).

National instrument 43-101 disclosure

Nicholas Rodway, PGeo (licence No. 46541) (permit to practice No. 100359), is the president, chief executive officer and a director of the company, and a qualified person as defined by NI 43-101, Standards of Disclosure for Mineral Projects. Mr. Rodway has supervised the preparation, verified and approved the technical content in this news release. Verification included review of field notes, sample tags and analytical certificates. 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 a 100-per-cent ownership in the Blue property mineral renure, which covers a land area of 114,074 hectares (approximately 1,140 square km). The project lies within the Atlin mining district, a 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 (LFZ). This structure is approximately 140 km in length and runs from the Tally-Ho shear zone in 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 has 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.