Mr. Darryl Jones reports

STAR COPPER COMPLETES 2ND DRILL HOLE CONFIRMING COPPER-GOLD EXTENSION DOWN-DIP AND ALONG STRIKE

Star Copper Corp. has provided the latest update regarding its continuing drill campaign at its 100-per-cent-owned 6,829-hectare (approximately 16,875-acre) flagship Star project in the Golden Triangle of British Columbia.

The second drill hole of the current campaign boosts the case for a high-grade copper porphyry centre at the Star Main project area. Drill hole B has confirmed a supergene cap near surface and has extended the copper footprint downdip and along strike from the previous hole.

Darryl Jones, chief executive officer of the company, noted: "We're systematically unlocking the value of a $10-million historical exploration database and building on it with targeted, modern exploration. Our team is eager to deliver on this inaugural drill program. Every metre of core we collect brings us closer to defining a large-scale copper-gold system, and the geological indicators we're seeing -- both near surface and at depth -- are highly encouraging. We're confident that continued drilling will continue to validate the scale and quality of the Star project."

Drill hole B (S-051) is completed. It collared 60 metres west of S-050 at, was drilled to 539 metres, the fourth deepest in the property's history. The hole was drilled to confirm and extend near-surface supergene copper-gold mineralization, characterize mineralization related to the Star fault, and test the depth of mineralization below 200 metres.

From surface to roughly 90 metres, plagioclase porphyry and lapilli tuff units are intruded by a sequence of strongly oxidized and silicified quartz diorite containing numerous fractures and vein-hosted copper mineralization. Malachite- and azurite-coated fractures form a supergene blanket that upgrades earlier chalcopyrite, with local peaks of 1.25 per cent chalcopyrite between 57 and 62 metres.

Below the oxide cap, primary chalcopyrite occurs as disseminations and B-type quartz-sulphide veinlets, highlighted by two deeper zones of elevated tenor: 203 to 213 metres (to 1.5 per cent chalcopyrite) and 379 to 400 metres (to 2 per cent chalcopyrite). Both are spatially associated with discrete potassic (potassium feldspar) alteration halos that intensify between 410 and 473 metres, suggesting proximity to the system's potassic core. Several clay-rich fault zones at 96 to 102 metres, 139 to 143 metres and 514 to 517 metres truncate core locally but do not materially offset the mineralized envelope.

S-051 confirms high-grade copper mineralization near surface, with strong potassic alteration zones persisting to the end of hole at 539 metres deep. Vein-hosted and disseminated copper mineralization continues beneath the supergene cap, extending the copper footprint downdip and along strike from S-050, significantly strengthening the case for a large, high-grade porphyry copper (plus or minus gold) centre at Star Main.

Drill hole C (S-052) is under way and steps out approximately 50 metres north of hole B (S-051) to test the extent of the supergene copper enrichment zone and evaluate the continuity of the mineralized domain at depth. The crew reports coring is under way and initially encountered abrasive ground at 124 metres. The team reamed the hole to bottom and advanced to 127 metres, at which point the HQ (2.5-inch diameter) rods were withdrawn and replaced with NQ (1-7/8ths-inch diameter) rods to improve efficiency, and continued drilling to a depth of 155 metres currently. The latest report indicates the core has improved and drilling continues as planned.

The plan is to intersect the 142 metres grading 0.43 per cent copper in hole S-0371. Deeper intercepts aim to test for structurally controlled gold enrichment, where prior results returned 12 metres at 2.33 grams per tonne gold at approximately 650 metres at the bottom of hole S-0371.

Campaign strategy

As described in the June 10, 2025, news release, the fully financed 2025 campaign is focused on expanding the existing discovery at Star Main, in addition to enhanced exploration at the multiple targets within the Star project. The company has targeted the Star Main, Star North and Star East prospects. Drilling is targeting: (i) the near-surface oxide zones; (ii) deep porphyry-style mineralization; and (iii) structures associated with the Star fault and Dick Creek fault with up to 4,000 metres of drilling. The Star Main discovery contains an extensive, near-surface, supergene zone and the current campaign (see May 27, 2025, news release) was designed to test both the lateral and vertical continuity of mineralized zones previously identified from over $10-million in prior drilling and exploration programs.

Qualified person

Jeremy Hanson, PGeo, a qualified person as that term is defined under National Instrument 43-101, is an adviser to the company and has reviewed and approved the technical aspects of this news release.

About Star Copper Corp.

Star Copper is an exploration and development company focused on developing high-potential copper projects in mining-friendly jurisdictions. The company aims to advance its British Columbian flagship Star project, where significant exploration work, including historical drilling has confirmed open mineralization at depth and in all directions. Star Copper's strategic plans include geological mapping and geophysical surveys to refine existing targets, diamond drilling programs to test high-priority zones, and environmental baseline studies and permitting groundwork alongside data analysis and resource modelling to support a future resource estimate prepared in accordance with NI 43-101. The company further plans to advance its Indata project with follow-up drilling to expand on previous high-grade copper and gold intercepts, trenching and surface sampling to delineate mineralized zones, and infrastructure improvements for site accessibility and operations. With a commitment to sustainable development and value creation, Star Copper aims to position itself to support surging industrial demand to meet growing global electrification needs.

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