Dr. Stephen Twyerould reports

GUNNISON COPPER ANNOUNCES FIRST COPPER SALES FROM JOHNSON CAMP MINE

Gunnison Copper Corp. has completed its first sales of pure copper cathode from its fully operational Johnson Camp mine (JCM) in southeastern Arizona, with production capacity of up to 25 million pounds of copper cathode annually.

On Sept. 15, 2025, Gunnison completed its inaugural copper sales, marking the start of revenue generation following successful commissioning. Gunnison sold a total of 225,371 pounds of finished copper cathode at an average realized copper price of $4.64 (U.S.) per pound, generating gross proceeds of approximately $1,046,194 (U.S.).

"This milestone represents the first revenue from Johnson Camp and demonstrates the rapid progress Gunnison has made in delivering value to shareholders since achieving first copper production just weeks ago," stated Craig Hallworth, senior vice-president and chief financial officer. "Strong copper prices and increasing production levels position us well as we move towards a potential equity valuation rerating as a copper producer. We are especially proud that every pound sold is 100 per cent made-in-America copper, directly supporting our nation as we work together to strengthen our supply chains."

Key highlights of first copper sales:

• Revenue milestone achieved: First sales total 225,371 pounds of finished copper cathode, generating over $1-million (U.S.) in gross proceeds.
• Strengthened U.S. supply chain: Sales represent the first made-in-America copper from JCM delivered into domestic markets.
• Nuton technology: First copper production using Nuton's bioleaching technology is expected later this year. Nuton, a venture of Rio Tinto, will be deploying this innovative technology at scale for the first time at Johnson Camp.
• Continued growth trajectory: JCM has a nameplate capacity of 25 million pounds of finished copper cathode annually.

Johnson Camp mine commenced production in the last week of August, 2025, ahead of schedule, and with an excellent health and safety record. Copper cathode from JCM is fully produced in the United States, contributing directly to American energy independence, advanced manufacturing, technology and national defence supply chains.

About Gunnison Copper Corp.

Gunnison Copper is a multiasset pure play copper developer and producer that controls the Cochise mining district, containing 12 known deposits within an eight-kilometre economic radius, in the Southern Arizona copper belt.

Its flagship asset, the Gunnison copper project, has a measured and indicated mineral resource containing over 831.6 million tons with a total copper grade of 0.31 per cent (measured mineral resource of 191.3 million tons at 0.37 per cent and indicated mineral resource of 640.2 million tons at 0.29 per cent) and a preliminary economic assessment (PEA) yielding robust economics, including a net present value (discounted at 8 per cent) of $1.3-billion, an internal rate of return of 20.9 per cent and a payback period of 4.1 years. It is being developed as a conventional operation with open-pit mining, heap-leach and SX/EW (solvent extration/electrowinning) 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 financed by Nuton LLC, a Rio Tinto venture, with a production capacity of up to 25 million pounds of finished copper cathode annually. Copper revenues from Johnson Camp accrue to Nuton until such time as Nuton has received payback of all of its financing for Johnson Camp.

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

For additional information on the Gunnison project, including the PEA and mineral resource estimate, please refer to the company's technical report entitled "Gunnison Project NI 43-101 Technical Report Preliminary Economic Assessment," dated effective Nov. 1, 2024, and available on SEDAR+.

Dr. Stephen Twyerould, a fellow of AusIMM, president and chief executive officer of the company, is a qualified person as defined by National Instrument 43-101. Dr. Twyerould has reviewed and is responsible for the technical information contained in this news release.

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