Mr. Darryl Jones reports

STAR COPPER CONFIRMS TWO PROSPECTIVE COPPER ZONES AND IDENTIFIES LARGE MAGNETIC ANOMALY AS DAILY DRILLING CONTINUES

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.

While the company's drilling campaign continues expanding and deepening and strengthening the known elevated-grade copper discovery at Star Main, exciting exploration results have been unearthed at Star North, Star East and Star West. Soil and rock samples collected at Star North and Star East provide a clear demonstration of intrusive and porphyritic mineralization that aligns with elevated soil sample anomalies and induced polarization (IP) chargeability signatures. Star West soil samples provide a high proportion of 90th-percentile soil anomalies. Combined, Star North, Star East and Star West are prime additional targets to the already-discovered Star Main porphyry asset.

Star Copper chief executive officer Darryl Jones commented: "Concurrent to our drill campaign, the field crew has been advancing prospecting, mapping and sampling at two localized targets previously identified as Star North and Star East. The preliminary results are compelling, and we aim to investigate them at depth as soon as possible. Intriguingly, a new target identified as Star West presents a large magnetic anomaly quite close to our field camp and, given its relatively easy access, has been prioritized for further study as part of the current campaign. So far, the scope and quality of the data continues to increase the probability of defining what we believe may be a large-scale copper-gold system. Every day provides us with new and exciting data and the enthusiasm across the entire team is palpable."

Drill hole B (S-051) completed and drill hole C (S-052) under way

S-051 confirms continued elevated supergene copper oxide mineralization near surface, with strong potassic alteration zones dominating to the end of hole at 539 metres deep. Vein-hosted and disseminated copper mineralization continues beneath the supergene cap, extending the copper footprint down dip and along strike from S-050, significantly strengthening the case for a large, high-grade porphyry copper-gold center at Star Main. Drill hole C (S-052) targets an intersection identified previously in hole S-037, which provided 142 metres grading 0.43 per cent copper. Deeper intercepts aim to test for structurally controlled gold enrichment, where prior results returned a composite grade of 12 metres at 2.33 grams per tonne gold from 608 to 620 metres near the bottom of hole S-037.

Geology sampling

Upon commencement of activity at the Star project, field crews initiated a sampling program of the Star North and Star East targets.

A total of 114 rock samples and 30 soil samples were collected at Star North and 59 rock samples at Star East.

Preliminary XRF (X-ray fluorescence) analysis was undertaken on site with prospective samples prepared and shipped to the lab.

The geologists followed up on historic soil anomalies coincident with IP chargeability highs, identifying and mapping several well mineralized intrusive and porphyritic samples.

Star North/Star East

Received soil assays and rock portable XRF data confirm copper anomalies within two zones, both with a roughly southwest-northeast orientation. Remaining assays for Star North rock (118) and Star East rock (59) are anticipated shortly.

Star West

An additional target area was identified close to camp with a high proportion of 90th-percentile soils from a 2013 study. This cluster is within and along the contact of a mapped quartz-monzodiorite-diorite (QMD) intrusive but has yet to be sampled. Field crews have completed soil extensions to the northwest and southwest and will complete trenching, mapping and rock sampling in the coming days.

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, Star East and Star West 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, as well as environmental baseline studies and permitting groundwork alongside data analysis and resource modelling to support a future resource estimate prepared in accordance with National Instrument 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.

We seek Safe Harbor.