Welcome to our dedicated page for Gunnison Copper news (Ticker: GCUMF), a resource for investors and traders seeking the latest updates and insights on Gunnison Copper stock.
The news feed for Gunnison Copper Corp. (GCUMF) highlights the company’s evolution as a multi-asset copper developer and producer in the Southern Arizona Copper Belt. Recent announcements emphasize operational milestones at the Johnson Camp Mine, technical progress at the Gunnison Copper Project, district-scale exploration initiatives and key financing and corporate developments.
News releases describe Johnson Camp’s transition from care-and-maintenance to a fully operational mine, including first copper production and the first sales of pure copper cathode from southeast Arizona. Gunnison reports that Johnson Camp has a production capacity of up to 25 million pounds of finished copper cathode annually and that copper revenues from Johnson Camp initially accrue to Nuton LLC, a Rio Tinto venture, until Nuton has received payback of its funding for the asset.
Coverage also focuses on the deployment of Rio Tinto’s Nuton bioleaching technology at Johnson Camp and its role in producing 99.99% pure copper cathode at the mine gate without traditional concentrators, smelters and refineries. A collaboration between Nuton and Amazon Web Services is highlighted, under which AWS uses the first Nuton copper produced at Johnson Camp in components of its U.S. data centres and provides cloud-based data and analytics support to optimise Nuton’s technology.
Additional Gunnison Copper news includes updates on the Gunnison Project’s High-Value-Add Work Program, such as limestone evaluation for potential industrial by-products, preliminary economic impact findings from a University of Arizona study, a non-binding Letter of Intent with Lunasonde to test airborne subsurface imaging across the Cochise Mining District, balance sheet developments involving the Nebari credit facility, private placement financing plans, and corporate announcements regarding board and management changes.
Investors and observers can use this news stream to follow operational performance at Johnson Camp, technical and economic studies at the Gunnison Project, district-scale exploration partnerships and the company’s financing and corporate strategy.
Gunnison Copper (OTCQB: GCUMF) announced the retirement of director Michael Haworth effective March 11, 2026, following the distribution and secondary private placement of Greenstone-held shares as that fund winds down.
The move follows Greenstone Resources II's exit and has broadened Gunnison's institutional shareholder base; the company intends to add new independent directors to strengthen the board.
Gunnison Copper (OTCQB: GCUMF) released an updated NI 43-101 PEA for the 100%‑owned Gunnison Copper Project (Arizona) reporting an after‑tax NPV8 of $1,952M (~US$2.0B), a 22.7% IRR and a 3.9‑year payback at $4.60/lb copper. The plan targets 3.2 billion lbs recovered over a 21‑year mine life and average annual production of 174 million lbs in years 1–15.
Key economics: initial capex $1,544M, cash cost $1.69/lb, AISC $2.06/lb, cement coproduct adds $130M NPV, and the report includes inferred resources (preliminary assessment).
Gunnison Copper (OTCQB: GCUMF) announced that Greenstone Resources II LP and affiliated funds (the "Greenstone Group") has engaged Paradigm Capital to sell up to 143,208,937 common shares (33.88% ownership) via a best-efforts institutional offering.
Completion is subject to share purchase agreements and is expected on or by 17 February 2026. After the Offering, the Greenstone Group will hold no common shares.
Gunnison Copper (OTCQB: GCUMF) announced it has fully eliminated the Nebari Natural Resources Credit Fund I LP principal, reducing Nebari principal from US$15.0 million to zero. The final step comprised conversions totaling US$4.75 million at a conversion price of US$0.2097 per share (C$0.30), resulting in the issuance of 22,651,407 common shares. Combined with a previously announced US$7.3 million repayment of non-convertible debt, all principal under the Second ARCA has been repaid or converted. Gunnison will repay a partial month of interest and is working to obtain release of the related security documents.
This milestone is presented as strengthening the company’s balance sheet and supporting its equity-based capital structure ahead of construction of the Gunnison Project.
Gunnison Copper (OTCQB: GCUMF) said Rio Tinto and Amazon Web Services will collaborate to bring the first Nuton™ copper produced at Gunnison's Johnson Camp mine into AWS U.S. data centers after a first industrial-scale deployment in December 2025. AWS will also provide cloud data and analytics to optimise Nuton's modular bioleaching system, which Produces 99.99% pure copper cathode at the mine gate and aims to avoid concentrators, smelters and refineries. The company says Nuton is projected to use substantially less water and have lower carbon emissions versus conventional processing and to recover value from material previously classed as waste.
Gunnison Copper (OTCQB: GCUMF) entered a Collaboration Framework Agreement with Lunasonde to deploy airborne Georadiotomography (aGRT) for an initial high-resolution subsurface survey over part of Gunnison's Cochise Mining District in southern Arizona.
The program includes test and calibration flights, data processing and 3D subsurface imaging of anomalies that may host critical minerals. Gunnison said results will be assessed with existing technical data to consider future use of aGRT.
Separately, Nebari converted US$500,000 of convertible principal at US$0.2097 per share, resulting in issuance of 2,384,358 common shares, reducing the Second ARCA principal and potentially enabling full repayment if proceeds from previously announced 48C tax credits are realized.
Gunnison Copper (OTCQB: GCUMF) announced that Rio Tinto's Nuton Technology produced first copper cathode at the Johnson Camp mine, marking the start of a four-year demonstration targeting approximately 30,000 tonnes of refined copper.
Nuton uses on-site microorganisms and modular bioreactors to leach primary sulphide ore, claiming up to 85% recovery, 80% less water use, and 60% lower carbon emissions versus conventional concentrator routes. Johnson Camp aims for a mine-to-metal carbon footprint of 0.82 kg CO2e/kg and 71 L/kg water intensity, supported by 134,000 Green-e renewable energy certificates.
Next steps include multi-year testing, independent third-party verification, and Rio Tinto internal review to validate long-term technical and environmental performance.
Gunnison Copper (OTCQB: GCUMF) announced on December 1, 2025 that it has fully repaid the US$7.3 million non-convertible principal portion of the Second Amended and Restated Credit Agreement (Second ARCA) with Nebari Natural Resources Credit Fund I LP.
Following the repayment, the only remaining balance under the Second ARCA is a $5.25 million convertible principal amount that Nebari retains the right to convert to equity under previously announced terms. Management said the repayment advances its goal of strengthening the balance sheet, improving financial flexibility, and moving toward fully retiring the remaining Nebari secured debt.
Gunnison Copper (OTCQB: GCUMF) announced the sudden passing of Director Colin Kinley on November 7, 2025. Colin had served on the Board since 2010 and was Chair of the Compensation Committee.
Board leaders described him as an internationally respected explorationist and mining subject matter expert whose contributions and friendship will be greatly missed. The company said Colin's seat will remain vacant until a new director is proposed and confirmed at the next annual shareholders meeting.
Gunnison Copper (OTCQB: GCUMF) reported that a limestone evaluation from historical drill holes found ~96% of 883 ft of analyzed core meets indicative thresholds for cement and agricultural lime, averaging >96% calcite and >55% CaO. About 21% met thresholds for premium paper filler/paint applications (avg >97% calcite, ~56% CaO).
The company notes ~224 million tons of limestone are scheduled as waste over a 16-year mine life and intends to expand testing and incorporate results into an updated PEA in Q1 2026 with PFS work ongoing.