Mr. Darryl Jones reports

STAR COPPER DISTRICT-SCALE CAMPAIGN UNDERWAY WITH INAUGURAL DRILLING AT STAR EAST AND RETURN TO COPPER CREEK

Star Copper Corp. has successfully completed the first drill hole into the Star East target.

Highlights:

• Inaugural Star East drilling achieves target depth with excellent core sample recovery;
• Proximal mineralization shows the system is still intact across the fault;
• Drilling has commenced at Copper Creek South;
• Two initial drill holes are planned at Copper Creek North;
• Fully funded exploration campaign supported by over $12-million flow-through financing;
• 3-D IP (induced polarization) and MT (magnetotellurics) planned for late June.

With the first-ever drill hole into the Star East target successfully and expeditiously concluded, the company feels confident in its assessment that the Star project is progressing toward a better understanding of mineralization control and overall understanding of the deposit model. Further IP and MT surveys are designed to fill in the unknowns that previous surveys were unable to define.

The early season program has been designed to test a series of compelling geophysical, geochemical and structural targets generated through the integration of IP chargeability and conductivity anomalies, airborne magnetic data, soil and rock geochemistry, historic trenching, and detailed geological and structural mapping.

Company chief executive officer Darryl Jones noted: "We decided to move quickly to commence drilling at some of our satellite locations with the added benefit of early season helicopter while we await the larger geophysical program. With MT and IP being conducted during June, 2026, testing these targets became a priority to understand the geologic landscape."

Once the initial phase of 2026 drilling is concluded at Copper Creek, the company expects to advance drilling at Star North and return to Star East while concurrently deploying 3-D IP and MT geophysical surveys at Star Main to refine drill targeting aimed at fine-tuning the district-scale hypothesis and advancing toward establishing sufficient geological confidence to support a future maiden mineral resources estimate at Star Main, both of which remain primary goals for this year's campaign.

Star East

Star East DDH SE-26-001 (340866E, 6457751N, azimuth 100 degrees, dip minus-63 degrees, total depth 230.6 metres) is the first drill hole completed on the Star East target, a one-kilometre-by-one-kilometre copper-gold-in-soil and IP chargeability anomaly located southeast of Star Main and separated from it by the northeast-trending Dick Creek fault. The hole intersected a broad sequence of plagioclase porphyry and andesite ash tuff, cut by several intervals of CKP (crowded pink-feldspar porphyry), providing the first direct test of geology beneath this largely covered target. Importantly, the presence of CKP at Star East is notable because the same intrusive phase is logged in several Star Main holes and is commonly associated there with mineralizing intrusive contacts along the margin of the Star stock and host Stuhini group volcanic and volcaniclastic rocks. As such, the hole supports the interpretation that Star East may represent a displaced or related part of the broader Star porphyry system across the Dick Creek fault.

Alteration and mineralization in SE-26-001 are consistent with a copper-gold porphyry-style environment, with broad propylitic to phyllic assemblages overprinting multiple zones of potassium-feldspar alteration, including stronger potassic development from approximately six to 23 m, 62 to 84.6 m, 96 to 171.9 m and again near the bottom of hole. Chalcopyrite is present from near surface as fine disseminations and in pyrite-chalcopyrite stringers, sigmoidal veinlets and sheeted vein sets, with notable zones including 27.2 to 30.0 m, a narrow semi-massive sulphide band at 44.4 to 44.5 m with K-feldspar halos, 84.6 to 88.5 m, 135.5 to 138.6 m and 159.0 to 162.7 m. Several of these mineralized intervals occur adjacent to, or within, CKP intrusions and strongly altered volcanic units, reinforcing similarities to Star Main and indicating that the Star East target preserves the same key ingredients seen elsewhere in the district-scale Star system.

Copper Creek

Advancing a high-priority copper-gold discovery target

Copper Creek has rapidly emerged as one of the company's most compelling exploration targets outside of Star Main. Historic exploration identified widespread copper-gold mineralization associated with altered volcanic rocks and quartz monzodiorite intrusive dike swarms within a structurally complex corridor extending along both sides of the Copper Creek drainage.

The target area was originally explored in the 1970s by previous operators, including Skyline Explorations and United Cambridge Mines, where drilling intersected broad intervals of copper mineralization, including historic drill hole G-2, which returned 35.5 metres grading 0.485 per cent copper, with localized higher-grade gold values reported within the broader mineralized system.

During the 2025 field season, Star Copper completed a detailed reconnaissance and target verification program at Copper Creek, confirming extensive hydrothermal alteration, structurally controlled copper mineralization and widespread copper-gold geochemical anomalies coincident with multiple untested IP chargeability anomalies. This culminated in the completion of the first drill hole in Copper Creek since the 1970s. CC-25-001 was drilled to 151 m and intersected 111.0 m of 0.348 per cent copper equivalent (0.178 per cent copper and 0.167 gram per tonne gold) from 40 m (see Star Copper news release dated March 24, 2026).

Drilling in 2026 will focus on testing multiple high-priority IP chargeability anomalies associated with coincident copper and gold soil anomalies hosted within strongly altered and fractured volcanic rocks and quartz monzodiorite dike swarms on both sides of the Copper Creek gully system.

CC 26-02 (Copper Creek North) has been designed to test a robust IP chargeability anomaly associated with coincident copper and gold soil anomalies along interpreted structural trends within altered volcanic rocks and quartz monzodiorite dike swarms.

CC 26-03 (Copper Creek South) will test a similar geophysical and geochemical signature approximately 500 metres to the south, providing an opportunity to evaluate the scale and continuity of the mineralized corridor.

"The commencement of drilling at Copper Creek is an exciting milestone for Star Copper and marks the beginning of what we believe will be a transformational exploration season," Mr. Jones continued. "Over the last two years, our technical team has systematically advanced the Star project from a single known mineralized centre toward a district-scale exploration opportunity. Copper Creek is a prime example of that work. Historic drilling, strong surface geochemistry, compelling geophysical signatures and widespread alteration all point toward the potential for a significant copper-gold system."

The company is committed to providing additional updates as drilling progresses throughout the 2026 field season and looks forward to building on exploration success aimed at building shareholder value.

Qualified person

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

About Star Copper Corp.

Star Copper is a Canadian mineral exploration company focused on the discovery and advancement of large-scale copper-gold systems in British Columbia. The company's flagship Star project is located in British Columbia's prolific Golden Triangle and hosts multiple high-priority targets and exhibits geological characteristics consistent with significant porphyry copper deposits. The project hosts multiple copper-gold porphyry-style targets, including Star Main, Star North, East and West, Copper Creek, and Copperline. Significant exploration 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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