Mr. Niel Marotta reports

SUN SUMMIT MINERALS COMMENCES FIELDWORK AT THE THEORY COPPER-GOLD PROJECT, TOODOGGONE MINING DISTRICT, BC

Sun Summit Minerals Corp. has mobilized exploration crews to commence 2026 fieldwork at the Theory copper-gold project 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 project, located in the highly prospective Toodoggone mining district (see press release dated March 17, 2025).

Theory project 2026 exploration program

The 2026 work program will build on the success from the 2025 field season, the first significant fieldwork on the property in over 30 years (see press release dated Jan. 21, 2026).

The planned 2026 fieldwork includes three phases: (i) a 476-line-kilometre airborne MT (magnetotelluric) geophysical survey (complete), (ii) a 28-day field program (under way) including prospecting, geological mapping and geochemical sampling; and (iii) induced polarization (IP) geophysical surveys on select targets.

A 476-line-kilometre airborne magnetotelluric (MobileMT) survey was completed in June at a nominal line spacing of 250 metres. The data will image subsurface resistivity and help locate causative intrusions and possible conduits for mineralization. The resulting geophysical compilation will allow the company to focus resources on the most prospective areas and data interpretation will inform coming exploration decisions. The MobileMT survey was completed by Expert Geophysics Surveys Inc. of Newmarket, Ont., under the guidance of geophysicist, Andrei Bagrianski, PGeo. Final deliverables are anticipated to be received in the near term and will help to guide the second and third phases of fieldwork.

Phase 2 fieldwork will include mapping/prospecting and rock, soil, silt geochemical sampling, with crews based out of helicopter-supported fly camps. Work will focus on the detailed evaluation of targets identified by 2025 fieldwork, assessment of areas of interest generated by the MobileMT survey, and continuing target generation and assessment in underexplored areas of the property.

Phase 3 will include up to 22 line kilometres of IP surveys over high-priority target areas, including the Bev and Saboteur zones.

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

Fieldwork will be managed by TerraLogic Exploration Inc. of Cranbrook, B.C., with helicopter and logistical support from the company's JD camp as required. The fieldwork has commenced and is expected to continue into September.

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 VNIR (visible and near-infrared) and SWIR (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 copper, 0.635 gram per tonne gold and 49 grams per tonne silver;
• Grab sample JBTHR059: 4.0 per cent copper, 0.596 gram per tonne gold and 61 grams per tonne silver;
• Grab sample MHTHR037: 3.3 per cent copper, 4.3 grams per tonne gold and 121 grams per tonne silver.

Bev zone:

• Broad copper soil and silt geochemical anomaly associated with multiphase alteration;
• Grab sample BLTHR029: 1.44 per cent copper, 0.043 gram per tonne gold and 12.8 grams per tonne silver.

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 copper, 0.088 gram per tonne gold and 99 grams per tonne silver;
• Grab sample JBTHR008: 0.65 per cent copper, 12.6 grams per tonne gold and 3,150 grams per tonne silver.

Petrographic analyses of 2025 samples identified strong epidote-chlorite-carbonate alteration directly associated with hypogene copper mineralization (chalcopyrite/bornite/chalcocite). This type of mineralization and alteration assemblage is interpreted to represent the inner shell of a porphyry system, which may indicate a proximal source for some of the Theory project mineralization.

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 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 its 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 project area shares similar geology to the JD project and Thesis Gold & Silver's Ranch-Lawyers projects. The 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 (the Theory project, 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 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 Ranch-Lawyers 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 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 the Orbit project, in the prolific Toodoggone region of north-central British Columbia as well as the Buck project in central British Columbia.

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