Mr. Darryl Jones reports

STAR COPPER COMMENCES DRILL CAMPAIGN IN BC'S GOLDEN TRIANGLE

Star Copper Corp. has commenced the 2025 drill program at its 6,829-hectare (approximately 16,875-acre) at its flagship Star project in British Columbia. Drilling will focus on expanding the existing discovery at Star Main, and may expand to Star North or Star East, should the current field sampling in either of those prospects warrant it.

The Star project, located in British Columbia's Golden Triangle is 100-per-cent-owned, 100-per-cent financed and fully permitted. The drill campaign has recently been upsized (see June 3 press release). The $2.5-million program now plans over 4,000 metres of diamond drilling, builds on over $10-million of previous exploration progress, and is guided by detailed 3-D magnetic inversion models and a refined structural interpretation.

New drill pads have been constructed at the Star Main discovery and equipment can be mobilized between drill pads via existing roads and trails over manageable terrain and does not require helicopter support, which dramatically decreased the budget of the entire campaign. The drill equipment arrived on site and was prepared for immediate operation.

The Star Main discovery contains an extensive, near-surface, supergene zone, which the company is exceptionally excited about expanding and enhancing through additional drilling this summer. This summer's drill campaign will also extend beyond previous drilled depths where mineralization was present, but drill rig capacity was not. The planned drill holes are intended to test (i) existing magnetic anomalies, (ii) geochemical highs in soils, and (iii) deepen and laterally extend chargeability zones, all with the expectation of expanding the known deposit at Star Main.

As described in a news release on May 27, 2025, the current drill plan is designed to test both the lateral and vertical continuity of mineralized zones previously identified with over $10-million in prior drilling and exploration campaigns, as well as newly modelled magnetic and chargeability anomalies. The 2025 plan targets both the near-surface oxide zones, deep porphyry-style mineralization and structures associated with the Star fault and Dick Creek fault with up to 4,000 metres amongst six primary drill holes (holes A to F).

Key drill targets:

• Hole A (under way): A 500-metre stepout hole designed to intersect the Star fault and test 150 metres of footwall mineralization beneath a previous intercept that yielded 200 m at (28 to 228 m) 0.49 per cent Cu (copper), 0.24 g/t (gram per tonne) Au (gold).
• Hole B: Follows up shallow oxide and sulphide mineralization north of the main zone. Nearby holes S_029 include 131 m (11 to 130 m) at 0.41 per cent Cu, 0.26 g/t Au.
• Hole C: A 600-metre hole intended to test deep extensions beneath S_027 (263 m (seven to 267 m) at 0.39 per cent Cu, 0.12 g/t Au), targeting a magnetic anomaly shell.
• Hole D: A planned 800-metre hole on the western flank, designed to extend and continue mineralization beneath S_040 (120 m (352 to 472 m) at 0.36 per cent Cu, 0.13 g/t Au).
• Hole E: Targeting both hangingwall and footwall zones around S_023 (290 m (three to 293 m) at 0.41 per cent Cu, 0.19 g/t Au).
• Hole F: A planned exploratory 300-metre hole in the southwestern extension of the magnetic anomaly.

"We're leveraging the best available science and our prior drilling success to execute a strategic, high-impact drill program," said Jeremy Hanson. "This is our most technically refined drill campaign at the Star project, to date and we expect it will yield strong advancements toward a mineral resource."

Darryl Jones, Star Copper's chief executive officer, adds: "The previous drilling on the property really motivated us to advance our exploration efforts. The confirmed presence of an extensive calc-alkalic porphyry copper-gold system comes as a result of over $10-million in historical exploration efforts, including geophysical and geochemical surveys, trenching, soil sampling, and more than 13,000 metres of drilling from 49 diamond drill holes. This historic work, along with our newly reinterpreted magnetic data, is guiding our drill targeting and also led us to begin testing the contiguous Star North and Star East claims. Given their similar characteristics to Star Main deposit, we are very keen to if the results from targeted sampling and trenching will confirm the geotechnical work. If the results prove positive, we may have a very interesting extension to the overall area of interest."

The entire drill program is supported by a reinterpretation of historic magnetic survey data inverted in early 2023 by Ronacher MacKenzie Geoscience (RMG). The resulting 3-D models confirmed the presence of magnetic shells coinciding with known mineralization and identified significant structural features, including the Star and Dick Creek faults. These structures are interpreted as part of a left-lateral strike-slip regime, with thrust and R'-style fault segments acting as conduits for mineralized fluids.

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, 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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