Mr. Nicholas Rodway reports

CORE SILVER SIGNIFICANTLY EXPANDS COPPER-MOLYBDENUM FOOTPRINT AT LAVERDIERE THROUGH SOIL SAMPLING

Core Silver Corp. has released the results from the 2025 soil sampling campaign at the Laverdiere copper project, located on the eastern Blue property in the Atlin mining district, northwestern British Columbia.

Core Silver's 2025 exploration program included the completion of a systematic 1.4-kilometre-by-5.6-kilometre (km) soil geochemical survey. In total, 231 soil samples were collected at 200-metre-by-200-metre (m) spacing. The program was designed to identify new zones of mineralization and to extend known copper-and-molybdenum-rich areas in regions of limited surface exposure over the Laverdiere porphyry.

Highlights from the 2025 soil sampling program

Large-scale copper-molybdenum system significantly expanded: Soil sampling has outlined a multikilometre Cu-Mo (copper-molybdenum) mineralized corridor -- extending known mineralization 1.7 kilometres northwest of the Main skarn zone and confirming district-scale potential.

Strong, consistent copper and molybdenum anomalies identified: Broad soil anomalies measure up to 1.75 kilometres wide, with peak values of 394 parts per million (ppm) Cu and 227 ppm Mo, representing more than 10 times local background levels.

Direct overlap with known high-grade zones: Key soil anomalies coincide with areas of previous drilling, including the Valley zone and Main skarn zone, strengthening confidence in continuity of the mineralized system.

New priority targets defined: Two previously untested areas (anomalies Y and Z) display strong Cu-Mo signatures and represent high-priority targets for future drilling.

Clear vectors toward a large porphyry system at depth: Integrated soil geochemistry, structure and geophysics point toward a large, well-developed Cu-Mo porphyry-skarn system that remains open in multiple directions and at depth.

System scale continues to grow: To date, Cu-Mo mineralization at the Laverdiere copper project has been traced for over five kilometres laterally and to drilled depths exceeding 1,000 metres, with substantial upside remaining.

"The 2025 soil sampling results at Laverdiere mark a major step forward for Core Silver," said Nick Rodway, president and chief executive officer. "We have now confirmed the presence of a large, coherent copper-molybdenum system extending over five kilometres, with multiple broad, mineralized zones that remain open in several directions. Importantly, these new soil results align closely with known high-grade skarn and porphyry-style mineralization, diamond drilling, structural controls, and geophysical responses, which significantly increases our confidence in the presence of a mineralized porphyry system or systems at depth. These zones provide a clear road map for future drill targeting and enhance the discovery potential at Laverdiere as we advance the project."

About the 2025 soil geochemical survey

The 2025 soil geochemical survey at the Laverdiere copper project included the collection of 231 soil samples at 200-metre line and sample spacing over an approximately 1.4-kilometre-by-5.6-kilometre grid. Samples were collected using a metal auger and photographed in the field. Sample descriptions, including sample number, location, elevation, colour, saturation, depth of sample and soil horizon, were recorded in the field and digitally recorded at the end of each field day on site in Atlin, B.C. Soil horizons targeted were mainly horizons B and C, however, where these horizons were undeveloped, talus fines or shallow organics (Ah) were collected.

In 2025, 78 soil samples returned assay values greater than 10 ppm Mo, 32 greater than 25 ppm, 14 greater than 50 ppm and two samples returned values greater than 100 ppm Mo. For Cu, 102 samples yielded values greater than 30 ppm, 55 greater than 50 ppm, 23 greater than 100 ppm and 11 samples returned values greater than 150 ppm Cu.

Modified Porphyry Index (MPIx) values for soil samples were calculated using the equation after Bouzari et al. (2022): (Cu divided by 10) plus Mo plus (10 times tungsten (W)) plus (20 times tin (Sn)) divided by (five times antimony (Sb)) plus (20 times thallium (Tl)) plus silver (Ag) plus arsenic (As) plus lithium (Li).

For missing or below detection limit (BDL) assay values, a value equal to half the detection limit for that element was substituted into the equation.

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 porphyry mineralization. The intrusion is associated with a very high-grade Fe-Cu-Au-Ag massive sulphide skarn occurrence (the Main zone) 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 0.02 g/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-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 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.

Core Silver's 2025 exploration campaign was designed to test the depth potential and continuity of a large (five km by eight km) multiphase Cu-Mo-Ag-or-minus-Au porphyry system through diamond drilling, detailed structural mapping and surface sampling. Seven drill holes were completed across five key target areas along the Valley fault zone for a combined 3,857 metres drilled in 2025. All assays from the 2025 diamond drilling program are pending.

Sampling, preparation, and quality assurance and quality control (QA/QC)

Soil samples collected in 2025 were transported by helicopter at the end of each field day. Samples were photographed in the field and sample descriptions, including sample number, location, elevation, colour, saturation, depth of sample and soil horizon, were recorded. 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 (inductively coupled plasma emission spectroscopy/mass spectrometry) finish for a 36-element package (method code AQ200).

National Instrument 43-101 disclosure

Nicholas Rodway, PGeo (licence No. 46541) (permit to practice No. 1000359), is the chief executive officer and a director of the company, and is the qualified person as defined by National Instrument 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 100-per-cent ownership in the Blue property mineral tenure, 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.

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