Company confirms historic copper-silver mineralization

VANCOUVER, BC / ACCESS Newswire / April 28, 2026 / Star Copper Corp. (CSE:STCU)(OTCQX:STCUF)(FWB:SOP) ("Star Copper" or the "Company"), a critical mineral exploration and development company, is pleased to announce that subsequent to its acquisition of a 100% interest in the Copperline Property located in north-central British Columbia, a reconnaissance field program was initiated with a summary of results reported below.

As reported in a Company news release of July 16, 2025, Company CEO Darryl Jones noted at the time that, "The Copperline Property is an exciting addition to our growing portfolio of high-grade copper assets in British Columbia. With its compelling geology, strong infrastructure access, and historical grades, Copperline represents an exceptional grassroots copper-silver opportunity in a proven metallogenic belt. 2026 plans are centered around historic drilling and receipt of drill permit expected shortly"

The Copperline Property consists of eight mineral claims totaling approximately 4,502 hectares, situated near Skutsil Knob at the south end of the Driftwood Range, approximately 120 km north-northeast of Smithers, British Columbia (Figure 1).

Executive Summary

On October 30, 2025, Star Copper completed its inaugural reconnaissance field program on the 945-hectare Copperline Property, located approximately 120 km north-northeast of Smithers, British Columbia. The program successfully confirmed historic copper-silver mineralization and collected infill soil samples designed to test extensions of known geochemical anomalies. Assay results are pending.

Key Program Highlights

• Confirmed visible copper mineralization at the historic Beaman Adit - four rock grab samples collected

• Observed mineralized float with visible malachite on slopes below the historic Main Zone, likely derived from upslope mineralization

• Completed infill soil sampling to test extensions of 2023 copper-in-soil anomalies (up to 463 ppm Cu); results pending

• Located historic drill core storage on property at 649970 E / 6190360 N

• Ground-truthed historic exploration data supporting the volcanic redbed copper-silver deposit model.

Property Overview

The Copperline Property surrounds Skutsil Knob at the south end of the Driftwood Range, hosting volcanic redbed copper-silver mineralization. (Vollo, 1974; Borovic, 1990).

The Copperline Property comprises 6 mineral tenures totalling 945 hectares in the Omineca Mining Division of British Columbia. The property is located at Latitude 55°50'N, Longitude 126°36'W (NTS 93M/15E), approximately 120 km north-northeast of Smithers. Access is by helicopter from Smithers or via logging roads extending from the Nilkitkwa River area.

The property hosts a volcanic redbed copper-silver deposit with strong geological similarities to the Sustut copper deposit (Imperial Metals) located 80 km to the northeast. Volcanic redbed deposits are known globally for their potential size and grade, with world-class examples including the Calumet-Hecla deposits (Michigan, USA) which produced over 72 Mt at 2.64% Cu.

Mineralization consists of disseminated and stringer bornite, tetrahedrite, chalcopyrite, and chalcocite with rare native copper, hosted within calc-alkaline volcanics of the Lower Jurassic Telkwa Formation, Hazelton Group (Weicker, 2001; Houles, 2003).

Select Historic Drill Intercepts (1973-74)

Table 1- Source: Vollo (1974, 1975); Weicker (2001). Note: Historic results are exploration information only and have not been verified by a Qualified Person. Star Copper 2025.

2025 Field Program

On October 30, 2025, a field crew was deployed by helicopter to the Copperline Property. Snow cover affected field conditions, with crews operating on snowshoes. Two field teams worked concurrently:

• Soil Sampling Team: Completed infill soil sampling to follow up on anomalous copper-in-soil results from 2023

• Prospecting Team: Conducted reconnaissance to confirm historic mineralization

Soil Sampling Program

The 2025 soil sampling program was designed to follow up on anomalous copper-in-soil results identified during the 2023 program (Rodway, 2023). The 2023 program returned highly anomalous copper values in the southeastern portion of the grid, including results of 449 ppm Cu and 463 ppm Cu, with anomalies remaining open to the east and south.

The 2025 sampling targeted infill and extension of these open anomalies along four east-west lines:

Table 2-Sample spacing: 25 m on all lines. Samples collected from B-horizon soils. Star Copper 2025.

Rock Sampling & Prospecting Results

Despite challenging snow conditions, the prospecting team successfully confirmed historic mineralization and collected samples from multiple locations:

Beaman Adit (649878 E / 6190550 N)

Four grab samples were collected from the historic Beaman Adit and immediately adjacent areas. Visible malachite (copper carbonate) was observed, confirming copper mineralization at this location. A 2023 sample from this adit returned 1.93% Cu and 94.3 g/t Ag (Rodway, 2023).

Mineralized Float Below Main Zone

While attempting to access historic trenches (obscured by snow), the field crew observed large boulders with visible malachite on slopes below the historic Main Zone. Two grab samples were collected. These boulders are interpreted as talus likely derived from the Main Zone mineralization upslope, providing additional confirmation of copper mineralization in the area.

Historic Drill Core Storage (649970 E / 6190360 N)

The field crew located cross-stacked drill core. This core remains on property and is available for future examination, re-logging, and potential re-sampling for verification purposes.

Summary

• Mineralization Style Confirmed: Visible malachite at the Beaman Adit is consistent with volcanic redbed copper-silver mineralization documented historically

• Anomalous Soil Geochemistry: 2023 soil sampling returned values up to 463 ppm Cu with anomalies open to east and south; 2025 infill sampling designed to test these extensions (results pending)

• Mineralization Confirmed in Float: Malachite-bearing boulders below Main Zone confirm presence of copper mineralization

• Core Available for Verification: Location of historic drill core allows for future re-sampling and assay verification

Several historically recommended exploration activities remain untested and represent priority targets:

• IP Geophysical Survey: Recommended in 1990, 2001, and 2023 (Borovic, 1990; Weicker, 2001; Rodway, 2023) but never completed. Essential for vectoring toward sulphide mineralization at depth.

• West Zone (MINFILE 093M230): Returned 2.14% Cu and 50.2 g/t Ag in 2003 sampling (Houles, 2003) - untested by drilling.

• Dave's Zone (MINFILE 093M231): Outcrop occurrence east of Main Zone - untested by drilling.

• Strike Extensions: No drilling north of DR-2 or south of DR-12 in Main Zone area.

• Down-Dip Potential: Historic drilling to ~150m depth; mineralization remains open at depth.

Cautionary Statement Regarding Historic Estimates

The historic mineral inventory estimate of approximately 900,000 tonnes grading 2% Cu and 48 g/t Ag was prepared by Craigmont Mines Ltd. in 1973-74 prior to the implementation of NI 43-101 standards. A Qualified Person has not done sufficient work to classify this estimate as a current mineral resource. The Company is not treating this estimate as a current mineral resource. The estimate is included for information purposes only to demonstrate the historical exploration significance of the property.

REFERENCES

• Borovic, I., 1990. Geological and Geophysical Report, Driftwood Property. BC Assessment Report 19978, prepared for T.J. Resources Inc.

• Houles, J., 2003. Prospecting and Diamond Drilling on the Copperline Property. BC Assessment Report 27276.

• Rodway, N., 2023. Copperline Property 2023 Assessment Report. Prepared for Zimtu Capital Corp., December 2023.

• Vollo, N.B., 1974. Diamond Drilling Report, DR Group, Craigmont Mines Ltd. BC Assessment Report 4967.

• Vollo, N.B., 1975. Diamond Drilling Report, DR Group, Craigmont Mines Ltd. BC Assessment Report 5478.

• Weicker, R., 2001. Geological and Prospecting Report on the Copperline Property. BC Assessment Report 26667, prepared for Kleinebar Resources Ltd. and Hathor Exploration Ltd.

QA/QC Statement

Star Copper Corp. follows industry standard protocols for quality assurance/quality control (QA/QC) procedures in British Columbia. Samples are shipped under chain-of-custody protocols to Bureau Veritas Laboratories, an ISO/IEC 17025 accredited laboratory. At Bureau Veritas, samples are dried, crushed, split, and pulverized to 85% passing 200 mesh. Analytical procedures include multi-element ICP-ES/MS following four-acid digestion, with gold and precious metals analyzed by fire assay with an atomic absorption or ICP finish.

Star Copper implements a robust QA/QC program, including the insertion of a minimum 5% certified reference materials (standards), blanks, and field duplicates at regular intervals into the sample stream to monitor analytical accuracy and precision. The performance on the blind standards, blanks and duplicates achieved high levels of accuracy and reproducibility and has been verified by Jeremy Hanson, a qualified person as defined by NI-43-101.

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 100%-owned Star Project in British Columbia's prolific Golden Triangle (watch our videos: https://starcopper.com/media/). The project hosts multiple copper-gold porphyry-style targets, including Star Main, Star North, and Copper Creek. 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, 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, watch our videos at https://starcopper.com/media/, and while you are there, sign up for free news alerts at 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.
Email: info@starcopper.com
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.

SOURCE: Star Copper Corp.