Mr. Niel Marotta reports

SUN SUMMIT OUTLINES 2026 EXPLORATION PLAN FOR THE THEORY COPPER-GOLD PROJECT, TOODOGGONE MINING DISTRICT, BC

Sun Summit Minerals Corp. has provided an overview of its coming exploration program at the Theory copper-gold project in the Toodoggone mining district in north-central British Columbia.

The purpose of the 2026 exploration program is to build on the favourable 2025 sampling and mapping results using a combination of airborne geophysics (mobile magnetotellurics (MobileMT)), geological mapping, prospecting, and soil/silt and rock geochemistry, followed by possible ground IP (induced polarization) geophysical surveys across the most promising target areas. A priority focus will be on the Bev-to-Saboteur trend of strong copper mineralization with an emphasis placed on advancing the project to drill ready for 2027. Work in 2025 (see news release of the company dated Jan. 21, 2026) targeted the Bev, Fred (1-3 and DM), Stik, Dar and South zones.

"Our second season at Theory is focused on prioritizing the strongest targets ahead of planned drill testing in 2027. The project's proximity to JD and the active exploration environment across the Toodoggone make this a compelling next step for Sun Summit," said Niel Marotta, chief executive officer of Sun Summit Minerals.

The Theory project

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. The project covers the northern extent of the significant Toodoggone district and is considered highly prospective for epithermal-related gold-silver mineralization and porphyry-related copper-gold mineralization. Reconnaissance-style exploration in 2025 resulted in the definition of numerous target areas (see news release of the company dated Jan. 21, 2026). These targets, which will be the focus for 2026, include:

• Bev target: Sampling of the main Bev zone in 2025 returned assays up to 1.44 per cent copper, 43 parts per billion gold and 12.8 parts per million silver (grab sample BLTHR029).
• Saboteur target: The Saboteur target consists of a three-kilometre-long trend of locally outcropping copper mineralization associated with coincident magnetic and radiometric (potassic) anomalies. Rock samples in 2025 from the trend returned the most consistent high-grade copper with an overall mean of 1.45 per cent Cu (n equal to 30), including sample LSTHR040 with 4.7 per cent Cu, 635 ppb Au and 49 ppm Ag; sample JBTHR059 with 4.0 per cent Cu, 596 ppb Au and 61 ppm Ag; and sample MHTHR037 with 3.3 per cent Cu, 4,290 ppb Au and 121 ppm Ag.
• Fred/DM/DMR targets: This collective zone of priority targets at the northern end of the project returned the highest copper values in the 2025 sampling program: up to 6.42 per cent Cu, 12.6 grams per tonne Au, 3,150 g/t Ag and 3.99 per cent zinc, plus over-detection barium (greater than 10,000 parts per million Ba).
• Stik1 and Dar targets: The Stik1 and Dar targets consist of zones with epithermal-style mineralization with several mineralized samples containing hydrothermal breccia textures, drusy quartz and clay minerals, with associated barite veining and chert with metal maximums to 675 ppm Cu, 10.7 ppm Ag and 1,880 ppm lead from grab samples.

Airborne survey

A project-wide airborne passive electromagnetic MobileMT survey is planned for early June to be conducted from the company's JD exploration camp. The survey comprises two areas (JD and Theory) totalling approximately 1,216 line kilometres, to be acquired along 250-metre-spaced survey lines.

The objective of the survey is to image the subsurface resistivity to a depth of approximately one km to two km, dependent on the conductivity distribution of the local geology. Complementary VLF (very-low-frequency) data, which provide near-surface EM information, will also be provided, when available and dependent on signal strength.

The nominal flight altitude of the helicopter will be 140 to 150 metres above the terrain. The nominal terrain clearance of the MobileMT bird will be 50 to 60 metres, depending on topography.

The data acquisition is expected to take approximately one week, with data processing and quality control undertaken progressively in the field, with interim products available within 15 to 20 days after the completion of flying. This timing will allow an initial evaluation to help to target planned ground IP surveys of select targets.

The MobileMT survey will be completed by Expert Geophysics Surveys Inc. of Newmarket, Ont,, under the guidance of geophysicist, Andrei Bagrianski, PGeo. The main instrumentation installed on the MobileMT towed bird are three orthogonal induction coils to measure naturally occurring magnetic fields in the frequency range of 25 hertz to 20,000 hertz and a GPS (Global Positioning System) antenna. A base station and field workstation will complement the survey.

Data products will include low-, medium- and high-frequency apparent conductivity grids and maps, resistivity sections for each surveyed line, resistivity depth slices and 3-D resistivity voxel plus VLF amplitude intensity data in various formats.

Fieldwork

Approximately 30 days of fieldwork are planned from a fly camp on the Theory project. Work will include geological mapping/prospecting and rock, soil, silt geochemical sampling to improve definition from priority targets based on 2025 field results. Work will be conducted by Terralogic Exploration Inc. of Cranbrook, B.C., with helicopter support from the company's JD camp as required.

IP survey

Based on preliminary results from phases 1 and 2, an IP crew from Peter Walcott and Associates would be directed to complete ground IP geophysical surveys on priority targets. Up to 22 line km of IP lines have been planned.

Exploration activities are anticipated to being in early June and continue with intermittent steps into September.

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 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 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 has 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 Ltd. 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 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 and 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 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.

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