Mr. Niel Marotta reports

SUN SUMMIT MINERALS ANNOUNCES COMPLETION OF EXPLORATION AT THE THEORY COPPER-GOLD PROJECT, TOODOGGONE MINING DISTRICT, BC

Sun Summit Minerals Corp. has completed its planned fieldwork for 2026 at its Theory copper-gold project, located in north-central British Columbia.

The 9,676-hectare Theory project borders Thesis Gold & Silver Inc.'s Ranch project to the north and is located within 10 kilometres to the northwest of Sun Summit's JD project. Sun Summit signed an option agreement with Eagle Plains Resources Ltd. to earn up to a 100-per-cent interest in the Theory project, located in the highly prospective Toodoggone mining district (see news release dated March 17, 2025).

Highlights from 2026 field program:

• Prospecting results continued to reveal copper mineralization at the Saboteur zone, a three-kilometre-long zone of chalcopyrite, bornite and chalcocite mineralization discovered in 2025, including THTHR094, a 2026 grab sample of a massive blue calcite vein with bornite and native copper. The sample was collected approximately 250 metres southeast of 2025 sample BLTHR029, which returned 1.44 per cent copper, 0.043 gram per tonne gold and 12.8 grams per tonne silver.
• Prospecting in the newly discovered Baguette Peak target area, approximately 600 metres southwest of the Saboteur zone, identified extensive copper mineralization, including chalcocite and chalcopyrite mineralization associated with a hydrothermally altered suite of volcanic rocks. Of particular note is THTHR086, a sample of strongly epidote-altered basaltic andesite comprising copper mineralization, including malachite, bornite, chalcocite and cuprite.
• A newly discovered zone north of Saboteur, named Misty Mountain, hosts numerous copper occurrences over a distance of 2.2 kilometres. The majority of mineralization is subvertically oriented calcite veins with variable amounts of malachite, bornite, chalcocite and cuprite.
• An airborne magnetotellurics (MobileMT) geophysical survey revealed strong anomalous resistivity associated with the Bev and Saboteur zones and aligns closely with anomalous copper samples taken in 2024 and 2025. The resistive zone seems also to closely map the presumed Jurassic-Triassic unconformity (approximately 200 million years old), termed by the B.C. Geological Survey as the red line, which is observed throughout the Golden Triangle and Toodoggone regions to have a high spatial correlation to many known mineral deposits.
• The IP (induced polarization) survey targeted the Bev to Saboteur zones and also highlighted strong resistivity associated with the red-line unconformity and demonstrated a broad, greater-than-500-metre chargeability anomaly (single line) under the Bev zone, which overlaps with magnetic and resistive signatures, providing a priority target toward an interpreted causative source for anomalous copper in soil and rock samples taken over the past two seasons.
• A total of 218 rock grab samples and 533 soil samples were collected in 2026. Geochemical and assay results are pending and will be reported after receipt and interpretation.

Niel Marotta, chief executive officer of Sun Summit Minerals, commented: "Our successful three-phase exploration program at Theory, running alongside an aggressive 16,000-metre drill campaign at our flagship JD project, caps off an exceptional season of operational execution. Discovering widespread copper mineralization at the surface of newly discovered zones -- backed by fresh ground IP and airborne MobileMT data -- gives us a powerful tool kit to refine our targets and map out a historic, first-ever drilling campaign for 2027. We continue to unlock significant value at the highly underexplored Theory project and look forward to updating the market as rock and soil results are received and interpreted."

Theory project 2026 exploration program

The three-phase 2026 fieldwork included a MobileMT survey, a 20-day field program including prospecting, geological mapping, and geochemical sampling, and induced polarization (IP) geophysics in select target areas.

A 476 line-kilometre MobileMT survey was completed at a nominal line spacing of 250 metres. The data allowed for high resolution of subsurface resistivity and assisted with planning for the follow-up ground IP survey. The MobileMT survey was completed by Expert Geophysics Surveys Inc. of Newmarket, Ont., under the guidance of geophysicist Andrei Bagrianski, PGeo.

An IP survey was completed over high-priority target areas, including the Bev and Saboteur zones. The survey consisted of approximately 17.0 line kilometres on eight variably spaced lines and was carried out by Peter E. Walcott and Associates Ltd.

Coupled with previously flown helicopter-borne gradient magnetic and radiometric surveys (2024), the 2026 MobileMT survey and ground IP data will improve the property-scale geophysical compilation and allow data interpretation to inform coming exploration decisions for the 2027 field season.

Fieldwork included mapping/prospecting and rock, soil, silt geochemical sampling, with crews based out of helicopter-supported fly camps. Fieldwork was managed by TerraLogic Exploration Inc. of Cranbrook, B.C., with helicopter and logistical support from the company's JD camp as required.

The results from the 2026 work program will be analyzed and modelled to identify and prioritize targets for 2027 drill testing.

Highlights from 2025 field program

Work in 2025 included:

• Data compilation with rectification and analysis of historical surface sampling and reconnaissance mapping;
• Remote-sensing acquisition of district-and property-scale data sets, focusing on visible-near infrared and short-wave infrared bands to identify mineral groups diagnostic of epithermal and porphyry alteration;
• Field program consisting of prospecting, detailed geological mapping, and systematic rock, soil and silt geochemical sampling on targets identified through data analyses.

Saboteur zone -- new high-grade copper discovery:

• Three-kilometre-long zone of copper mineralization associated with coincident magnetic-high transition zone and strong radiometric potassic alteration anomaly;
• 15 rock samples returned over 1 per cent copper;
• Grab sample LSTHR040: 4.78 per cent Cu, 0.635 gram per tonne gold and 49 g/t silver;
• Grab sample JBTHR059: 4.0 per cent Cu, 0.596 g/t Au and 61 g/t Ag;
• Grab sample MHTHR037: 3.3 per cent Cu, 4.3 g/t Au and 121 g/t Ag.

Bev zone:

• Broad copper soil and silt geochemical anomaly associated with multiphase alteration;
• Grab sample BLTHR029: 1.44 per cent Cu, 0.043 g/t Au and 12.8 g/t Ag.

Fred-DM-DMR zone:

• 1.6-kilometre-by-three-kilometre zone of copper mineralization associated with barite veining;
• Grab sample BLTHR051: 6.42 per cent Cu, 0.088 g/t Au and 99 g/t Ag;
• Grab sample JBTHR008: 0.65 per cent Cu, 12.6 g/t Au and 3,150 g/t Ag.

National Instrument 43-101 disclosure and disclaimer

This news release has been reviewed and approved by Sun Summit's vice-president exploration, Ken MacDonald, PGeo, a qualified person as defined in National Instrument 43-101, Standards of Disclosure for Mineral Projects, of the Canadian Securities Administrators. Some technical information contained in this news release is historical in nature and has been compiled from public sources believed to be accurate. The historical technical information has not been verified by Sun Summit and may, in some instances, be unverifiable dependent on the existence of historical drill core and grab samples. Historical results are no indication of future results.

Community engagement

Sun Summit is engaging with first nations on whose territory the company's projects are located and is discussing their interests and identifying contract and work opportunities as well as opportunities to support community initiatives. The company looks forward to continuing to work with local and regional first nations with continuing exploration.

About the Theory project

The Theory project comprises 23 mineral claims covering 9,676 hectares. The project is located in north-central British Columbia within the Toodoggone mining district and is in close proximity with Sun Summit's JD project. The Theory project area shares similar geology to the JD project and Thesis Gold & Silver's Ranch-Lawyers projects. The Theory project is helicopter accessible and recent road upgrades completed in 2023 by Thesis Gold & Silver have brought road access to within eight kilometres of the southern boundary of the Theory project. Sun Summit signed an option agreement with Eagle Plains Resources to earn up to a 100-per-cent interest in 10,000 hectares of mineral claims in the highly prospective Toodoggone mining district in British Columbia (see news release dated March 17, 2025).

Geology in the Theory project region primarily comprises lower Jurassic Hazelton Group volcanics (Toodoggone formation, same host rock as the JD project) which unconformably overlie late Triassic Takla group volcanics. The entire package of volcanic and volcaniclastic rocks is intruded by late Triassic and early Jurassic stocks. The Jurassic-Triassic unconformity (approximately 200 million years old), termed by the British Columbia Geological Survey as the red line, is observed throughout the Golden Triangle and Toodoggone regions to have a high spatial correlation to many known mineral deposits. The majority of the property encompasses this highly prospective contact.

About the JD project

The JD project is located in the Toodoggone mining district in north-central British Columbia, a highly prospective deposit-rich mineral trend. The JD project covers an area of over 15,000 hectares and is in close proximity to active exploration and development projects, such as Thesis Gold & Silver's Lawyers and Ranch projects, TDG Gold Corp.'s Baker-Shasta projects, Amarc Resource Ltd.'s Aurora project, Centerra's Gold Inc.'s Kemess East and Underground projects, as well as the past-producing Kemess open-pit copper-gold mine.

The JD project is 450 kilometres northwest of the city of Prince George and 25 kilometres north of the Sturdee airstrip. It is proximal to existing infrastructure in place to support the past-producing Kemess mine, including roads and a hydroelectric power line.

The JD project is in a favourable geological environment characterized by both high-grade epithermal gold and silver mineralization as well as porphyry-related copper and gold mineralization. Some historical exploration, including drilling, geochemistry and geophysics, has been carried out on the property; however, the project area is largely underexplored.

About Sun Summit Minerals Corp.

Sun Summit Minerals is a mineral exploration company focused on the discovery, expansion and advancement of district-scale gold and copper assets in British Columbia. The company's portfolio is anchored by its flagship JD project, alongside the Theory project, and Orbit project in the prolific Toodoggone region of north-central British Columbia,and the Buck project in central British Columbia.

We seek Safe Harbor.