Mr. Adam Travis reports

COAST COPPER EXPANDS COPPER KETTLE PROPERTY AND IDENTIFIES MAJOR UNTESTED PORPHYRY TARGET

Coast Copper Corp. has released new results from a 14-square-kilometre audio magneto telluric (AMT) geophysical survey at its Copper Kettle property, located within the Island copper belt on northern Vancouver Island, British Columbia. The company has expanded the property through staking, now covering more than 5,225 hectares (ha), and completed an extensive technical review of the Northwest zone (NW zone), an important yet historically underexplored porphyry copper-(Cu)-molybdenum-(Mo) occurrence forming the northwestern end member of the productive Island copper cluster (ICC), hosting BHP's former Island copper mine.

Adam Travis, chief executive officer, stated: "Earlier drilling only explored peripheral skarn-style mineralization, leaving much of the larger porphyry potential untested. The AMT survey reveals a significant underlying intrusion beneath zones where many holes terminating in mineralization. Our plan for 2026 is to push the project forward with a detailed induced polarization survey followed by drilling. There are clear parallels between the NW zone at Copper Kettle and the historic Island copper mine, and we're eager to elevate this property to flagship status alongside our brownfield Empire mine project which is also located on northern Vancouver Island."

NW zone -- large, open porphyry system

On northern Vancouver Island, a 50-kilometre (km) east-west-trending corridor hosts a series of Early Jurassic mineralized copper-gold-(Au)-molybdenum porphyry systems. At its western end, Coast Copper owns the Knob Hill NW property which abuts Northisle Copper and Gold Inc.'s Hushamu and Red Dog properties. At the eastern end, Coast Copper owns the Copper Kettle property, adjacent to BHP's Island copper mine lease. The Copper Kettle property hosts the NW zone, one of the six genetically related Jurassic calc-alkaline porphyry systems which form the ICC. The ICC occupies a 10 km long structural-magnetic anomaly with the NW zone, which is the only member located outside BHP's Island copper mining lease. The Island copper mine is the only cluster member mined to date (1971 to 1995) which produced approximately 345 million tonnes with average grades of 0.41 per cent Cu, 0.017 per cent Mo, 0.19 g/t Au and 1.4 g/t silver (Ag), along with significant rhenium making it Canada's second-largest copper mine at the time of production.

All six systems feature multiphase rhyodacite porphyry intrusions and characteristic alteration zones. The NW zone is characterized by:

• A strong central magnetic high interpreted as a magnetite-rich potassic core;
• Surrounding chargeability anomalies indicating a pyrite halo;
• Coincident Cu-Mo soil anomalies and peripheral skarn mineralization.

From 1983 to 1989, BHP drilled 31 diamond holes (9,072 metres (m)) and 10 percussion holes (789.5 m), outlining a buried system 1.8 km long and 800 m wide. Seventeen drill holes returned significant copper and molybdenum values; nine of which ended in mineralization, confirming this system remains open to depth.

Some historical drill intercepts include4:

• Hole E-64: 277.4 m at 0.20 per cent Cu and 0.018 per cent Mo (0.30 per cent CuEq) from 18.3 m;
• Hole E-69: 91.5 m at 0.57 per cent Cu and 0.017 per cent Mo (0.66 per cent CuEq) from 155.4 m, with skarn bands up to 2.93 per cent Cu over three m from 228.6 m; final assay 0.24 per cent Cu and 0.047 per cent Mo (0.50 per cent CuEq) over three m;
• Hole W-6: 332.8 m at 0.15 per cent Cu and 0.036 per cent Mo (0.35 per cent CuEq) from 106 m.

These findings are based on original BHP records and internal logs, compiled, and reported according to National Instrument 43-101 standards.

2025 Coast Copper surface fieldwork expands target area

Recent fieldwork expanded historical anomalies:

• Confirmed an untested 800-metre-by-400-metre Cu-in-soil anomaly (greater than 200 parts per million (ppm) Cu; peaks at 1,800 ppm) north of historical drill sites;
• Collected rock samples assaying up to 2.21 per cent, 2.09 per cent and 1.86 per cent Cu across a five km west-northwest stretch;
• Discovered a new polymetallic skarn target, with assays reaching 0.46 per cent Cu, 0.66 g/t Au, 55 g/t Ag, 7.53 per cent Pb and 5.96 per cent Zn; soils contained up to 2,842 ppm Cu.

These results indicate significant untested lateral and depth potential, largely hidden beneath glacial cover.

December, 2025, AMT survey highlights

The 54-station AMT survey (spaced at 500 m) spanning 14 square km revealed:

• A shallow conductive layer linked to known Cu-Mo mineralization within sediments;
• A larger resistive body under historic drilling, interpreted as a possible intrusive source;
• Evidence that past drilling in the 1980s only addressed a limited portion of the broader system.

Results integrated with the 2012 Geoscience B.C. magnetic survey uphold the hypothesis of a sizable, mostly untested intrusive complex beneath the NW zone.

Next steps

Following these findings, Coast Copper is intending to conduct a 25 km detailed induced polarization survey and plans a conditional 10-site diamond drill program right beside BHP's historic Island copper mine.

Qualified persons

The technical information contained in this news release has been prepared, reviewed and approved by Wade Barnes, PGeo (British Columbia), Coast Copper's geological consultant and a qualified person within the context of the Canadian Securities Administrators' NI 43-101 -- Standards of Disclosure for Mineral Projects.

About Coast Copper Corp.

Coast Copper's flagship projects are the Copper Kettle postdiscovery Cu-Au-Mo project located in the Island copper cluster on northern Vancouver Island, the former-producing Cu-Au Empire mine also located on northern Vancouver Island, and the former producing Emerald and Virginia Silver mines located near the Huckleberry mine and Smithers in Northern B.C. Coast has an additional 18 projects in B.C. that are available for acquisition, partnering or option that are strategically located in seven advanced mining camps that include the Toodoggone, Golden Triangle Anyox, Goliath Resources (Golddigger), Babine, Bralorne, and Sullivan camps providing exposure and leverage to millions of dollars being spent on neighboring properties. Coast Copper's strategy is to optimize the value of each mineral property within the company's portfolio through a combination of prospect generation and discovery-focused, high-impact exploration while minimizing share dilution through active deal-making.

We seek Safe Harbor.