Mr. Adam Travis reports

COAST COPPER COMPLETES HISTORICAL COMPILATION, CONDUCTS FIELD PROGRAMS AND CONSOLIDATES COPPER KETTLE PROPERTY, ISLAND COPPER BELT NORTHERN VANCOUVER ISLAND

Coast Copper Corp. has completed its initial historical compilation work and received results back from field programs at its 100-per-cent-owned Copper Kettle property. After reviewing the historical data and conducting an initial property examination, the company expanded the property by acquiring a 100-per-cent interest in an additional 267 hectares (ha) of ground adjacent to its existing Copper Kettle claim block from an arm's-length individual, increasing the total property size to 2,849 ha. The property is strategically located between the past-producing BHP Group Ltd. Island Copper mine and Northisle Copper and Gold Inc.'s North Island project on Northern Vancouver Island and includes the Northwest zone (NW zone) which forms the northwestern end of a greater than 10-kilometre-(km)-long Island Copper cluster of porphyry copper (Cu), gold (Au) and molybdenum (Mo) deposits.

Highlights in this news release include:

• The NW zone is part of the Island Copper cluster of mineral deposits as noted by BHP geologists.
• Significant mineralization over a large area in historical drilling has outlined a porphyry Cu-Mo system (NW zone) over a strike length of 1,800 metres (m) associated with a magnetic anomaly.
• Highlights from previous drilling includes 277.4 metres assaying 0.20 per cent Cu and 0.018 per cent Mo in hole E-64, 91.5 m assaying 0.57 per cent Cu and 0.017 per cent Mo in hole E-69 and 88.4 m assaying 0.38 per cent Cu and 0.029 per cent Mo in hole W-6, nine of these 17 drill holes ended in copper mineralization.
• Room for expansion of mineralization at depth and along strike: Compilation and initial fieldwork conducted by Coast Copper indicates potential to extend mineralization not only at depth below the historical drill holes but onto ground that BHP did not control at the time.
• Compilation of surface geochemical data and recent sampling results show that glacial till masks the underlying mineralization noted in drilling, but sampling in areas where outcrop is not masked by tills has returned results greater than 200 parts per million (ppm) Cu in soils and up to 1,800 ppm Cu in historical soil samples and many rock grab samples taken by Coast Copper in the 2 per cent Cu range up to five kilometres northwest of the NW zone.
• Discovered a new multielement mineralized skarn target north of the NW zone.
• The 2025 soil program verified the historical copper soil anomaly north of the NW zone, which has not been drill tested. The copper anomaly north of the NW zone is 800 m by 400 m using a 200 ppm Cu cut-off.

Since the last update (March 24, 2025 news release), the company's team has reviewed historical data regarding the property, including drilling by BHP between 1983 to 1989 totalling 31 diamond drill holes (9,072 m) and 10 percussion drill holes (789.5 metres) and the Northern Vancouver Island Geoscience project which was a collaboration between Geoscience BC and the Island Coastal Economic Trust. The definitive technical paper, authored by prominent BHP geologists, on the Island Copper Cluster of Mineral Deposits was published in 1996 in the Canadian Institute of Mining (CIM) Special Volume 46: Porphyry Deposits of the Northwestern Cordillera of North America. Along with the past-producing Island Copper mine and deposits still held under the mining lease by BHP, this paper also details the NW zone (porphyry Cu-Mo system) now held by Coast Copper.

Adam Travis, chief executive officer, commented: "Our strategy of acquiring exploration projects is starting to pay dividends, having acquired a significant zone of mineralization on the doorstep of the past-producing Island Copper mine. The significance of the NW zone has been documented in a paper authored by distinguished BHP geologists and highlights the underexplored and underappreciated nature of Northern Vancouver Island where projects of this stature can be picked up for only staking costs! Several drill hole results returned very significant copper and molybdenum results in the 0.2 to 0.5 per cent Cu range over 50 to 250 m intervals with many of them ending in mineralization. This is especially significant when the molybdenum grades are considered, which effectively doubles the copper equivalent grade. With this large area of mineralization noted across several drill holes, combined with broad intervals and several drill holes ending in copper mineralization, it is no wonder it was of significant interest to a major company like BHP, even at lower copper prices than we see today.

"Although the main area of drilling is covered by gravels and by definition is a blind discovery, new exposures created by logging activity around the periphery of the NW zone are also showing outcrop exposures with peripheral porphyry style alteration and mineralization such as pyritized volcanics with trace chalcopyrite to new skarn style mineralization indicating that the full extent of the porphyry system has not been fully defined and is larger than previously known."

Historical compilation

NW zone as summarized in CIM special volume 46 (1996): "The NW zone is a large, mineralized porphyry Cu-Mo system where rhyodacite porphyry dikes similar in composition to those at Island Copper have been intersected in drilling over a strike length of more than 1,800 m. A strong, central magnetic anomaly is rimmed by a horseshoe shaped chargeability high which coincides with the zone and is explained by the moderate to high magnetite and pyrite contents zoned around the porphyry dikes. Copper skarns and porphyry Cu-Mo mineralization are also zonally distributed about the porphyry intrusions. The centre contains abundant molybdenite in quartz pyrite veins and copper occurs as chalcopyrite veins."

NW zone BHP drilling 1983 to 1989: A review of the historical drilling indicates that it mostly consisted of relatively short vertical drill holes which returned significant results (greater than 0.2 per cent Cu) over very broad intervals; see 17 highlighted drill holes in Table 1. More importantly, a detailed review of the drill hole logs and the assay database indicates that nine of these 17 drill holes ended in copper mineralization. A 1987 report on drill hole E-69 noted upper skarn bands returning up to 2.93 per cent Cu over three m and that, "The hole was stopped 30 m into a mafic porphyry with patchy brown (biotite?) alteration which contains chalcopyrite and molybdenite with grades in the 0.2 to 0.3 per cent Cu and 0.10 to 0.050 per cent Mo ranges."

Elements that are noted with a -- were not sampled or partially sampled and therefore cannot be reported.

Copper Kettle field program

Given the significant historical drilling and large extent of mineralization, Coast Copper elected to conduct an initial examination in June consisting of the collection of 29 rock samples over a four-day period focused on outcrop exposures to the northwest of the NW zone (which is covered). The assay results of the program include rock grab samples CK25R14 and 15 returning 2.21 and 2.09 per cent Cu, respectively, CK25R22 returning 1.86 per cent Cu, CK25R18 returning 1.81 per cent Cu and CK25R29 returning 1.80 per cent Cu. Results from this program were encouraging and indicate that peripheral porphyry style alteration/mineralization and skarn style mineralization can be found as far as 5.5 km away from the NW zone.

A second phase field program consisting of the collection of 39 soil samples and six rock samples was completed in July and results discovered a new mineralized skarn target. Sampling was primarily focused north and northwest of the NW zone, with a new skarn discovery returning assay results of 0.46 per cent Cu, 0.66 g/t Au, 55 g/t Ag (silver), 7.53 per cent Pb (lead) and 5.96 per cent Zn (zinc) in sample CK25R34, and soil samples CK25030 and 31 returning 2,842 ppm Cu, 1.78 per cent lead, 6,498 ppm zinc, 1,255 ppm Cu and 4,583 ppm zinc, respectively. This area requires further follow up on these significant copper results as it was outside of the historically known NW zone.

Qualified person

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' National Instrument 43-101 -- Standards of Disclosure for Mineral Projects.

About Coast Copper Corp.

Coast Copper's primary exploration focus is the Empire mine property, located on Northern Vancouver Island, British Columbia, which covers three historical open pit mines and two past-producing underground mines that yielded iron, copper, gold and silver. In 2023, Coast Copper launched a generative program aimed at advancing its other properties in parallel with Empire. In 2025, Coast Copper acquired six new projects bringing its total number of 100-per-cent-owned projects in B.C. to 13, including the Empire mine and Knob Hill NW properties located on Northern Vancouver Island, B.C., and mineral properties in the Golden Triangle, Huckleberry, Anyox, Babine, Toodoggone and Sullivan districts. Coast Copper's management team continue to actively review precious and base metal opportunities in Western North America.

We seek Safe Harbor.