Star Copper Confirms Southwest Expansion of Mineralization at Star Main Target

Hole D core samples refine and support continuity of system footprint

VANCOUVER, BC / ACCESS Newswire / August 12, 2025 / Star Copper Corp. (CSE:STCU)(OTCQX:STCUF)(FWB:SOP) (“Star Copper” or the “Company”), a critical minerals exploration and development company, is pleased to provide an update on the 2025 Summer drill campaign at its 100%-owned Star Copper-Gold Project, located in northwestern British Columbia. The latest report offers preliminary results from diamond drill Hole D (S-053B) at its 100%-owned Star Copper-Gold Project, located in northwestern British Columbia.

Drilled 65 metres southwest of Hole B (S-051) near a significant copper-gold soil and trench anomaly, Hole D was designed to test the southwest flank of current drilling and historic sampling, targeting extensions of mineralization across the Star Fault zone.

Hole D reached a total depth of 184 metres and intersected predominantly quartz monzodiorite with local monzonite, crosscut by several narrow fault zones, including the main Star Fault between 93.25 and 104 metres. From near surface (~26 m), the hole encountered an oxide-to-transitional zone with malachite and azurite coatings, consistent with the supergene cap developed above major structures at Star.

UTM 9N NAD83

Below the oxide cap, copper mineralization is hosted as disseminated chalcopyrite and in quartz-sulphide veinlets, locally intensifying within zones of veining, brecciation, and potassic alteration. Notable mineralized intervals include:

• 77.8-82.4m

• 116.6-121.25m

• 151.5-155m

• 164-171m

• 171.2-178.75m

These results confirm copper mineralization on the southwest side of Star Main and refine the structural and intrusive controls across the Star Fault zone, supporting continuity of mineralization and expanding the footprint of the system in this direction.

“Hole D demonstrates that the Star system continues to grow in multiple directions,” stated Darryl Jones, CEO of Star Copper. “This step-out confirms our geologic model and opens up further potential for expansion to the southwest, an area with strong copper-gold surface anomalies and favourable host rocks.”

The 2025 summer drill campaign has been designed to test both the lateral and vertical continuity of mineralized zones previously identified from over $10 million in prior drilling and exploration campaigns. Drilling encompasses targets identified as near-surface oxide zones, deep porphyry-style mineralization, and structures associated with the “Star Fault” and “Dick Creek Fault.” The Company is investigating beyond previously drilled depths and is nearing the midway point of up to 4,000 meters of drilling across six primary drill holes (Holes A-F) with holes A, B, C and D now complete.

The Company continues to compile results from the ongoing program and will provide additional updates as assays are received and interpreted.

Qualified Person

Jeremy Hanson, P. Geo., a Qualified Person as that term is defined under NI 43-101, is an independent contractor of the Company and has reviewed and approved the technical aspects of this news release.

On Behalf of the Board of Directors

~Darryl Jones~

Darryl Jones
CEO, President & Director
Star Copper Corp.

About Star Copper Corp. (CSE:STCU)(OTCQX:STCUF)(FWB:SOP / WKN A416ME)

Star Copper Corp. 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 modeling 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.

For more information visit: www.starcopper.com and to sign up for free news alerts please go to https://starcopper.com/news/news-alerts/, or follow us on X (formerly Twitter),Facebook or LinkedIn. More information in respect of the project, including historical drilling, is available under the Company’s profile at www.sedarplus.ca and/or in the Company’s February 26, 2025 technical report.

Investor Relations Star Copper Corp.

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Web: https://starcopper.com/

Cautionary Note Regarding Forward-Looking Statements

This news release contains forward-looking statements and other statements that are not historical facts. Forward-looking statements are often identified by terms such as “will”, “may”, “should”, “anticipate”, “expects” and similar expressions. All statements other than statements of historical fact, included in this news release are forward-looking statements that involve risks and uncertainties. Forward-looking statements in this press release include, but are not limited to, statements regarding exploration of the Company’s flagship Star Project and the potential thereof, as well as the anticipated mineral resource estimate planned in respect of the Star Project. There can be no assurance that such statements will prove to be accurate and actual results and future events could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ materially from the Company’s expectations include, but are not limited to, the early-stage nature of the Star Project, the inherently unpredictable nature of resource exploration, market conditions and the risks detailed from time to time in the filings made by the Company with securities regulators. The reader is cautioned that assumptions used in the preparation of any forward-looking information may prove to be incorrect. Events or circumstances may cause actual results to differ materially from those predicted, as a result of numerous known and unknown risks, uncertainties, and other factors, many of which are beyond the control of the Company. The reader is cautioned not to place undue reliance on any forward-looking information. Such information, although considered reasonable by management at the time of preparation, may prove to be incorrect, and actual results may differ materially from those anticipated. The forward-looking statements contained in this news release are made as of the date of this news release and the Company will update or revise publicly any of the included forward-looking statements as expressly required by applicable law. Forward-looking statements contained in this news release are expressly qualified by this cautionary statement.