Mr. Nicholas Rodway reports

CORE SILVER SAMPLES 316 G/T SILVER & 0.62% COPPER AT THE VALLEY ZONE AS DRILLING CONTINUES

Core Silver Corp. has presented 2025 diamond drilling plans and the first round of surface rock sample assay results from the Laverdiere copper project on the eastern Blue property in the Atlin mining district of northwestern British Columbia.

Laverdiere copper project:

• Recent structural mapping and sampling at the Laverdiere copper project have extended zones of high-grade porphyry copper-molybdenum-silver-plus-or-minus-gold mineralization at the Valley zone and identified new porphyry-style veins and vein breccias along the Valley fault.
• Rock samples collected in 2025 from outcropping porphyry vein and vein breccia exposures along the Valley fault have returned 0.62 per cent copper with 316 grams per tonne silver and 7,770 parts per million molybdenum (F421663), 0.47 per cent copper with 187 grams per tonne silver and 682 parts per million molybdenum (F421662), and 0.74 per cent copper with 50 grams per tonne silver, 320 parts per million molybdenum and 0.71 gram per tonne gold (F421657).
• High-grade porphyry copper-silver-molybdenum-plus-or-minus-gold mineralization along the Valley fault is concentrated within structurally complex zones associated with magnetic low geophysical anomalies. These magnetic lows are interpreted as zones of increased hydrothermal activity and are now defined as Priority 1 drill targets.
• In 2025, Core Silver personnel discovered exposed porphyry copper-molybdenum-silver veining and epithermal stockwork hosted in the Laverdiere porphyry and located 2.3 kilometres south of the Valley fault at Copper Creek.
• Preliminary assay results from rock samples collected from outcropping porphyry veins exposed along the lower section of Copper Creek in 2025 have returned 0.63 per cent copper with 17 grams per tonne silver and 355 parts per million molybdenum (F421677). This vein system has since been mapped and sampled for just over 200 metres of exposed strike length.
• High-grade porphyry copper-molybdenum-silver-plus-or-minus-gold mineralization within the Laverdiere porphyry is now confirmed over 4.4-kilometre corridor, extending from the Main zone to Copper Creek, and remains open for expansion in all directions and at depth.
• The 2025 program at Laverdiere includes diamond drilling supported by prospecting, drone-assisted structural mapping and a 5.5-kilometre-by-2.5-kilometre soil grid across key target areas.
• Diamond drilling is also planned for the Jackie target at the Silver Lime polymetallic project. A new 3-D geological model has been developed, and numerous high-grade silver targets are being considered for the 2025 program. These targets will be presented in the coming weeks.

Nick Rodway, Core Silver's president and chief executive officer, commented: "Two thousand twenty-five marks another exciting year for Core Silver as we continue drilling at the Laverdiere copper project. With high-grade copper and silver mineralization confirmed for over four kilometres and multiple new targets now ready to be tested, we see significant potential for both scale and grade. Our goal this season is to demonstrate that the Blue property hosts multiple district-scale and robust polymetallic systems capable of delivering long-term value for shareholders."

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 copper. 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 kilometre of the total strike length of this economically important fault zone has been explored. Diamond drilling completed 125 metres north of the French adit in 1974 reportedly returned 175 metres of 0.27 per cent copper, including six metres of 1.60 per cent copper and 7.8 metres of 1.60 per cent copper. Core Silver's inaugural diamond drilling campaign at the Laverdiere copper project in 2022 returned up to 48.5 metres of 1.02 per cent copper equivalent (0.90 per cent copper, six grams per tonne silver and 0.11 gram per tonne gold) from 31.46 metres depth in drill hole LAV22-001 (French adit), 223 metres of 0.20 per cent copper equivalent (0.11 per cent copper, two grams per tonne silver and 0.006 per cent molybdenum) from 15 metres depth in LAV22-002 (French adit), and 107.38 metres of 0.31 per cent copper equivalent (0.11 per cent copper, 0.023 per cent molybdenum, 0.9 gram per tonne silver and 0.02 gram per tonne gold) from 144.62 metres 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 intrusions on the west side of Hoboe Creek. A large unexplored embayment in the intrusion is mapped eight kilometres 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 kilometres to the southwest of the known zones of high-grade porphyry-skarn mineralization.

At Laverdiere, an extensive Cretaceous granodiorite intrusion hosts widespread copper-molybdenum-silver-plus-or-minus-gold 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 (LFZ) at the porphyry-marble contact. The Main zone was drill tested in 2022 and returned significant copper grades over extensive widths, including: 267.05 metres of 0.21 per cent copper equivalent (0.17 per cent copper, one gram per tonne silver and 0.04 gram per tonne gold) from surface, including 48.54 metres of 1.02 per cent copper equivalent (0.90 per cent copper, six grams per tonne silver and 0.11 gram per tonne gold) from 31.46 metres depth.

In 2024, high-grade porphyry copper-molybdenum-silver-plus-or-minus-gold mineralization at the newly defined Valley zone, located 2.2 kilometres 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-kilometre east-west trend following the Valley fault that historically returned up to 3.24 per cent copper (with 82 grams per tonne silver, 0.56 gram per tonne gold and 0.053 per cent molybdenum) and 0.32 per cent molybdenum (with 1.03 per cent copper and four grams per tonne silver) in 2022. In 2024, a 20-centimetre-thick east-west-striking quartz vein grading 0.83 per cent copper, 47 grams per tonne silver, 0.44 gram per tonne gold and 0.007 per cent molybdenum 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 (BV) 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 lead samples were analyzed through a tertiary overlimit method (GC-817).

National Instrument 43-101 disclosure

Nicholas Rodway, PGeo (licence No. 46541) (permit to practise No. 100359), is 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 reviewed and approved the technical content in this release.

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 (LFZ). This structure is approximately 140 kilometres 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 southern 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 the 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.