Gunnison Copper Corp. (TSX: GCU) (OTCQB: GCUMF) (FSE: 3XS0) is pleased to announce that Lunasonde Inc. has completed its airborne survey across portions of the Company’s Cochise Mining District land package in southern Arizona. The program utilized Lunasonde’s proprietary Airborne Georadiotomography (aGRT) technology to generate high-resolution subsurface imaging aimed at identifying potential copper-bearing structures with the intent to generate drill targets. This work represents an important step forward in the Company’s ongoing collaboration with Lunasonde to enhance district-scale exploration targeting.

Data processing is now underway, with initial results expected in the near term. Gunnison plans to integrate the data with its existing geological and geophysical datasets to identify and prioritize high-potential drill targets across the district. This program is expected to support the generation of new exploration opportunities and support potential resource expansion across the broader Cochise Mining District, positioning Gunnison for continued exploration progress in 2026.

Lunasonde is a defense and mineral exploration technology startup dedicated to revolutionizing subsurface sensing using its novel radar system capable of discerning underground features from aerial and space platforms. Their mission is to address the scarcity of critical minerals and life-sustaining natural resources by delivering rapid, high-resolution subsurface data via aerial radar combined with advanced processing pipelines. Lunasonde’s solutions support commercial, defense, and humanitarian applications-enabling resource mapping, recurring monitoring, and exploration in environmentally sensitive or politically challenging areas on Earth, and, ultimately, celestial bodies.

Triple Flag Altius Buyback Agreement

Gunnison Copper Corp. has entered into a buyback option agreement with Altius Royalty Corporation and Triple Flag entities, providing the Company with the right to reduce certain existing royalties and terminate an expansion-related stream option at its Gunnison Copper Project in Arizona. The agreement grants Gunnison the option to reduce the 3.0% Triple Flag gross revenue royalty to 2.0%, and to reduce the Altius gross revenue royalty by 0.5%, as well as to terminate Triple Flag’s expansion option.

The Parties intend that the foregoing options be exercisable only as a single, indivisible package and only in connection with a qualifying change of control transaction announced on or before March 31, 2028. The total consideration payable upon exercise is US$65 million.

ABOUT GUNNISON COPPER

Gunnison Copper Corp. is a multi-asset pure-play copper developer and producer that controls the Cochise Mining District (the district), containing 12 known deposits within an 8 km economic radius, in the Southern Arizona Copper Belt.

Its flagship asset, the Gunnison Copper Project, has a main pit Measured and Indicated Mineral Resource containing over 846.1 million tons with a total copper grade of 0.33% (Measured Mineral Resource of 191.5 million tons at 0.37% and Indicated Mineral Resource of 654.5 million tons at 0.31%).

The Strong & Harris satellite deposit, located approximately 1.9 miles from the Gunnison processing facilities, is also included in the mine plan and hosts an Inferred Mineral Resource of 76.1 million tons grading 0.49% total copper (0.32% CuOx) at a 0.07% cutoff, 0.56% zinc and 0.12% silver, containing approximately 740 million pounds of copper, including 483 million pounds of oxide copper, as well as zinc (856 million pounds) and silver (9.0 million ounces).

A preliminary economic assessment was completed in March 2026 for the Gunnison Project yielding robust economics including an NPV8% of $2 billion, IRR of 23%, and payback period of 3.9 years. It is being developed as a conventional operation with open pit mining, heap leach, and SX/EW refinery to produce finished copper cathode on-site with direct rail link. The PEA is preliminary in nature and includes Inferred Mineral Resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves. There is no certainty that the conclusions reached in the PEA will be realized. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.

In addition, Gunnison’s Johnson Camp Asset, which is now in production, is fully funded by Nuton LLC, a Rio Tinto Venture, with a production capacity of up to 25 million lbs of finished copper cathode annually.

Other significant deposits controlled by Gunnison in the district, with potential to be economic satellite feeder deposits for Gunnison Project infrastructure, include South Star, and eight other deposits.