Gunnison Copper debuts 30-share ADRs on NYSE American

Each GUNN ADR represents 30 common shares, and eligible U.S. shareholders may convert through brokers or custodians subject to applicable requirements.

Rhea-AI Filing Summary

Gunnison Copper Corp. began trading its Level II ADRs on NYSE American under GUNN on October 26, 2026. Each ADR represents 30 common shares. The listing is not a new securities offering: no additional common shares are being issued and no capital is being raised. Eligible U.S. shareholders may convert existing common shares through a broker or custodian, subject to applicable requirements; ADR issuance fees are waived through January 23, 2027.

The March 2026 preliminary economic assessment for the Gunnison Copper Project estimates ~175 million pounds of average annual copper production over a 21-year mine life, more than 3.2 billion pounds over the mine life, US$2.0 billion after-tax NPV at 8%, a 22.5% IRR and 3.9-year payback, based on US$4.60/lb copper. The assessment includes Inferred Mineral Resources, is preliminary, and says there is no certainty its conclusions will be realized; Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. Johnson Camp is in production, with capacity of up to 25 million pounds of finished copper cathode annually.

Key Figures

ADR ratio: 30 common shares per ADR Average annual copper production: ~175 million pounds Copper production over mine life: More than 3.2 billion pounds +4 more

7 metrics

ADR ratio 30 common shares per ADR Gunnison Copper Level II ADRs trading under GUNN

Average annual copper production ~175 million pounds March 2026 PEA estimate over a 21-year mine life

Copper production over mine life More than 3.2 billion pounds March 2026 PEA estimate

After-tax NPV (8%) US$2.0 billion March 2026 PEA; based on US$4.60/lb copper

IRR 22.5% March 2026 PEA

Payback period 3.9 years March 2026 PEA

Johnson Camp finished copper cathode production capacity Up to 25 million pounds annually Johnson Camp is in production

Key Terms

Level II ADRs, after-tax NPV (8%), IRR, Preliminary Economic Assessment, +2 more

6 terms

Level II ADRs financial

"Gunnison’s Level II ADRs are now trading on the NYSE American under GUNN"

Level II American Depositary Receipts (ADRs) are a sponsored program that lets a foreign company list its existing shares for trading on U.S. stock exchanges (such as the NYSE or NASDAQ) by issuing ADRs through a U.S. depositary bank. They require the foreign issuer to register the ADRs with the U.S. Securities and Exchange Commission and to furnish regular audited financial reports and meet the exchange's listing standards. Level II ADRs allow secondary trading by U.S. investors but do not permit the issuer to raise new capital in the U.S. market (raising capital in the U.S. is done with a Level III ADR program).

after-tax NPV (8%) financial

"US$2.0 billion after-tax NPV (8%), with a 22.5% IRR"

IRR financial

"with a 22.5% IRR and 3.9-year payback"

IRR (Internal Rate of Return) is the annualized percentage return an investment is expected to produce based on its projected series of cash outflows and inflows; mathematically, it’s the rate that makes the present value of those cash flows balance to zero. Investors use IRR to compare and rank projects or investments—similar to comparing the interest rates on savings accounts—to judge which offers the best return for the time and risk involved.

Preliminary Economic Assessment technical

"March 2026 Preliminary Economic Assessment outlined"

A preliminary economic assessment is an initial analysis that estimates the potential profitability and feasibility of a project or resource, such as a new mineral deposit or development venture. It provides a rough idea of costs, benefits, and risks, helping investors decide whether to pursue more detailed studies. This early evaluation is important because it offers a snapshot of whether the project is worth further investment and development.

Inferred Mineral Resources technical

"includes Inferred Mineral Resources that are considered too speculative"

An inferred mineral resource is an estimate of the quantity and grade of minerals in the ground based on limited sampling and geological information, where confidence is low and continuity is uncertain. For investors it signals potential value but also higher risk—like a rough sketch of a hidden treasure that requires much more exploration and testing before you can reliably judge its size or economic worth.

Mineral Reserves technical

"Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability"

Mineral reserves are the amounts of a metal or mineral that a company has identified and can legally and economically extract with current technology. Think of it like the usable fuel in a car’s tank rather than all the oil in the ground; reserves determine how long a mine can produce, help estimate future revenue and costs, and shape a company’s value and investment risk.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What ticker does Gunnison Copper (GCUMF) use for its NYSE American ADRs, and what is the ADR ratio?

Gunnison Copper's Level II ADRs trade on NYSE American under GUNN, with each ADR representing 30 common shares.

Can GCUMF shareholders convert common shares to GUNN ADRs?

Eligible U.S. shareholders may convert existing common shares into ADRs through their broker or custodian, subject to applicable requirements. ADR issuance fees are waived through January 23, 2027.

Does GCUMF's NYSE American ADR listing raise capital?

No. The listing is not a new securities offering; no additional common shares are being issued and no capital is being raised in connection with it.

What does GCUMF's March 2026 PEA estimate for the Gunnison Copper Project?

The preliminary economic assessment estimates ~175 million pounds of average annual copper production over a 21-year mine life, with more than 3.2 billion pounds over the mine life. It reports US$2.0 billion after-tax NPV at 8%, a 22.5% IRR and a 3.9-year payback, based on US$4.60/lb copper; its conclusions are not certain to be realized.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 6-K: How Foreign Companies Report to the SEC →

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Available on EDGAR 10/26/2026 - 07:15 AM EDT Accepted by SEC EDGAR 10/26/2026 - 07:15 AM EDT Learn about SEC filing dates

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE
SECURITIES EXCHANGE ACT OF 1934

For the month of October, 2026.

Commission File Number 001-43506

Gunnison Copper Corp. (Translation of registrant’s name into English)

Concord Place

2999 N. 44th Street, Suite 300

Phoenix, Arizona 85018
(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F ☐ Form 40-F ☒

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1) ☐

Indicate by check mark if the registrant is “submitting” the Form 6-K in paper as permitted by Regulation S-T “Rule” 101(b)(7) ☐

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date October 26, 2026	Gunnison Copper Corp.
	By:	/s/ Craig Hallworth
		Craig Hallworth
		President & Chief Executive Officer

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Exhibit Index

Exhibit		Description of Exhibit
99.1		Press Release dated October 26, 2026

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Exhibit 99.1

NEWS RELEASE

Gunnison Copper Officially Begins Trading on NYSE American Under Ticker “GUNN”

NYSE American debut expands access to U.S. investors as Gunnison advances its position as a growing American copper producer

October 26, 2026

Phoenix, Arizona — Gunnison Copper Corp. (NYSE-A: GUNN) (TSX: GCU) (OTCQB: GCUMF) (FSE: 3XS0) (“Gunnison” or the “Company”), an American copper company headquartered in Phoenix, Arizona, is pleased to announce that its American Depositary Receipts (“ADRs”) have commenced trading today on the NYSE American under the ticker symbol “GUNN”, marking a significant milestone in the Company’s growth and capital markets development.

The NYSE American listing opens a new chapter for Gunnison, expanding access to U.S. institutional and retail investors at a time when American-made copper has become increasingly important to national security, defense readiness, Super Intelligence, advanced manufacturing and the nation’s industrial future.

With production ramping up toward full capacity at its Johnson Camp Mine and significant growth potential at its flagship Gunnison Copper Project, Gunnison offers investors exposure to a growing American copper producer with assets located entirely in Arizona and the ability to produce finished copper cathode on-site.

“Today is a defining moment for Gunnison Copper and an exciting milestone for our shareholders, employees and the future of American copper production,” said Craig Hallworth, President and Chief Executive Officer of Gunnison Copper. “Our NYSE American debut brings our story directly to the U.S. investment community, aligning our capital markets presence with where we operate, where we produce copper and where we see tremendous opportunity for growth.”

NYSE American Listing and ADR Investor Information

Gunnison’s Level II ADRs are now trading on the NYSE American under GUNN, with each ADR representing 30 Gunnison Copper common shares. The Bank of New York Mellon (“BNY”) serves as depositary bank.

Shareholders interested in purchasing GUNN ADRs or converting existing Gunnison common shares are encouraged to review the Company’s comprehensive ADR FAQ:

GUNNISON COPPER – ADR INVESTOR FAQ & CONVERSION INSTRUCTIONS

Key details include:

	●	NYSE American: GUNN — trading in U.S. dollars.
	●	ADR Ratio: One ADR represents 30 Gunnison common shares.
	●	Existing Listings: TSX: GCU | OTCQB: GCUMF | FSE: 3XS0.
	●	Conversion: Eligible U.S. shareholders may convert existing common shares into ADRs through their broker or custodian, subject to applicable requirements.
	●	Fee Waiver: ADR issuance fees are waived through January 23, 2027.

The ADR listing does not constitute a new offering of securities. No additional common shares are being issued and no capital is being raised in connection with the listing.

For conversion assistance, shareholders may contact BNY at canadadrconversions@bny.com.

Strengthening America’s Defense and Critical Mineral Supply Chains

Gunnison’s NYSE American debut comes amid increasing U.S. government focus on securing domestic critical mineral production and reducing reliance on foreign supply chains.

Last week, Gunnison welcomed U.S. Secretary of the Interior Doug Burgum and Congressman Juan Ciscomani to its producing Johnson Camp Mine in Cochise County, Arizona, highlighting the strategic importance of American copper production to national security, industrial competitiveness and the nation’s economic future.

The visit underscored the growing alignment between Gunnison’s mission and federal priorities to strengthen domestic mineral production, support American manufacturing and secure critical supply chains. At Johnson Camp, Gunnison mines, processes and produces finished copper cathode on-site, eliminating the need for overseas smelting or refining.

A Significant American Copper Growth Opportunity

Beyond current production, Gunnison is advancing its flagship Gunnison Copper Project, located approximately 1.5 miles from Johnson Camp.

The Company’s March 2026 Preliminary Economic Assessment outlined:

	●	~175 million pounds of average annual copper production over a 21 year mine life.
	●	More than 3.2 billion pounds of copper production over the life of mine.
	●	US$2.0 billion after-tax NPV (8%), with a 22.5% IRR and 3.9-year payback, based on US$4.60/lb copper.

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.

The flagship Gunnison Project represent a significant opportunity to expand American copper production and strengthen long-term domestic supply security.

“America’s future depends on securing the critical minerals needed to power our economy, defend our nation and support the next generation of technology,” concluded Hallworth. “Gunnison is proud to be part of that future. With our NYSE American listing, we are opening the door to a broader U.S. investor base as we continue building a leading American copper company.”

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 million tons with a total copper grade of 0.33% containing 5.19 billion pounds of copper (Measured Mineral Resource of 192 million tons at 0.37% containing 1.42 billion pounds of copper and Indicated Mineral Resource of 655 million tons at 0.31% containing 3.77 billion pounds of copper).

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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 million tons grading 0.49% total copper (0.32% CuOx) at a 0.07% cutoff, 0.56% zinc and 0.12 oz/ton 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 (“PEA”) was completed in March 2026 for the Gunnison Project yielding robust economics including an NPV8% of $2 billion, IRR of 22.5%, 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.

For more information on the Company, please visit our website at www.GunnisonCopper.com.

For additional information on the Gunnison Project please refer to the technical report titled “Gunnison Project NI 43-101 Technical Report, Preliminary Economic Assessment, Cochise County, Arizona, USA” with an effective date of March 18, 2026 filed on SEDAR+ at www.sedarplus.ca.

For additional information on the Johnson Camp Mine please refer to the technical report titled “Johnson Camp Mine NI 43-101 Technical Report, Cochise County, Arizona, USA” with an effective date of March 18, 2026 filed on SEDAR+ at www.sedarplus.ca.

Dr. Roland Goodgame, Senior VP of Project Development of the Company is a Qualified Person as defined by NI 43-101. Dr. Goodgame has reviewed and approved the technical information contained in this news release.

For further information regarding this press release, please contact:

Gunnison Copper Corp.
Concord Place, Suite 300, 2999 North 44th Street, Phoenix, AZ, 85018

Melissa Mackie
T: 647.533.4536
E: info@GunnisonCopper.com
www.GunnisonCopper.com

Cautionary Note Regarding Forward-Looking Information

This news release contains “forward-looking information” concerning anticipated developments and events that may occur in the future. Forward-looking information contained in this news release includes, but is not limited to, statements with respect to: (i) the intention to deploy the Nuton® technology at the Johnson Camp mine and future production therefrom; (ii) the continued funding of the stage 2 work program by Nuton; (iii) the details and expected results of the stage two work program; (iv) future production and production capacity from the Company’s mineral projects; (v) the results of the preliminary economic assessment on the Gunnison Project; (vi) the exploration, development, optimization and permitting of the Company’s mineral projects; (vii) anticipated benefits of the NYSE American listing; and (viii) the Company’s growth strategy and its anticipated role in domestic copper supply.

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In certain cases, forward-looking information can be identified by the use of words such as “plans”, “expects” or “does not expect”, “budget”, “scheduled”, “estimates”, “forecasts”, “intends”, “anticipates” or “does not anticipate”, or “believes”, or variations of such words and phrases or state that certain actions, events or results “may”, “could”, “would”, “might”, “occur” or “be achieved” suggesting future outcomes, or other expectations, beliefs, plans, objectives, assumptions, intentions or statements about future events or performance. Forward-looking information contained in this news release is based on certain factors and assumptions regarding, among other things, the Company will satisfy all of the NYSE American and regulatory requirements to complete a listing of ADRs on the NYSE American, the Company will continue to satisfy the continued listing requirements of the NYSE American, Nuton will continue to fund the stage 2 work program, the availability of financing to continue as a going concern and implement the Company’s operational plans, the ability to achieve the conclusions of the PEA, the estimation of mineral resources, the realization of resource estimates, copper and other metal prices, the timing and amount of future development expenditures, the estimation of initial and sustaining capital requirements, the estimation of labour and operating costs (including the price of acid), the availability of labour, material and acid supply, receipt of and compliance with necessary regulatory approvals and permits, timelines for government review of permit applications, the estimation of insurance coverage, and assumptions with respect to currency fluctuations, environmental risks, title disputes or claims, and other similar matters. While the Company considers these assumptions to be reasonable based on information currently available to it, they may prove to be incorrect.

Forward looking information involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by the forward-looking information. Such factors include risks related to the Company not obtaining adequate financing to continue operations, Nuton failing to continue to fund the stage 2 work program, that the Company fails to maintain the listing of its ADRs on the NYSE American, that the Company does not satisfy all of the NYSE American and regulatory requirements to complete a listing of ADRs on the NYSE American , risks inherent in the construction and operation of mineral deposits, including risks relating to changes in project parameters as plans continue to be redefined including the possibility that mining operations may not be sustained at the Johnson Camp Project, mining does not commence at the Gunnison Copper Project, the assumptions and conclusions set out in the PEA prove incorrect, risks related to the delay in review and approval of work plans and permits, variations in mineral resources and reserves, grade or recovery rates, risks relating to the ability to access infrastructure, risks relating to changes in copper and other commodity prices and the worldwide demand for and supply of copper and related products, risks related to increased competition in the market for copper and related products, risks related to current global financial conditions on the Company’s business, uncertainties inherent in the estimation of mineral resources, access and supply risks, risks related to the ability to access acid supply on commercially reasonable terms, reliance on key personnel, operational risks inherent in the conduct of mining activities, including the risk of accidents, labour disputes, increases in capital and operating costs and the risk of delays or increased costs that might be encountered during the construction or mining process, regulatory risks including the risk that permits may not be obtained in a timely fashion or at all, financing, capitalization and liquidity risks, risks related to disputes concerning property titles and interests, environmental risks and the additional risks identified in the “Risk Factors” section of the Company’s reports and filings with applicable Canadian securities regulators.

Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such information. Accordingly, readers should not place undue reliance on forward-looking information. The Company does not undertake to update any forward-looking information, except in accordance with applicable securities laws.

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Filing Exhibits & Attachments

2 documents

Press Releases

• EX-99.1 EX-99.1 39.1 KB
• EX-99 GRAPHIC 17.1 KB