# Gunnison Copper Announces That Rio Tinto's Nuton Technology Produces First Copper Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/gunnison-copper-announces-that-rio-tinto-s-nuton-technology-produces-first-coppe--53f6b3c9-0bfa-4ca1-b776-00796d2d8e86 Original source: https://money.tmx.com/en/quote/GCU/news/6680349421216159/gunnison-copper-announces-that-rio-tinto-s-nuton-technology-produces-first-coppe Publisher: tmx Original announcement: 2025-12-04T11:30:00.000Z Analysis by Minestarters Atlas Atlas analysis published: Unknown date Atlas analysis updated: Unknown date - Company: Gunnison Copper Corp. - Ticker: GCU - Exchange: TSX - Region: Arizona - Primary commodity: Copper - Secondary commodities: None reported - Document categories: Metallurgy, Production - Extracted: 2026-08-21 04:02:50 UTC Narrative sentiment: 0.80 · Bullish ## Minestarters Atlas summary Gunnison Copper has announced the first successful production of copper cathode at its Johnson Camp mine in Arizona using Rio Tinto's Nuton bioleaching technology. The technology targets primary sulphides with up to 85% recovery and offers significantly lower carbon and water footprints compared to traditional methods. Reasoning: The announcement marks a major technological milestone for the company's Johnson Camp asset, proving the viability of Rio Tinto's Nuton bioleaching technology at scale. - Positive factor: First successful industrial-scale production of copper using Nuton bioleaching technology - Positive factor: High recovery rates \(up to 85%\) from primary sulphides - Positive factor: Significant environmental advantages \(lower carbon and water intensity\) - Positive factor: Demonstrates ability to unlock previously uneconomic resources - Negative factor: Technology is in a demonstration period \(4 years\) - Negative factor: Long-term technical performance still requires validation Facts used in scoring: 3 ## Classification and evidence **High Recovery** Polarity: positive Definition: Recovery at or above the exceptional band for the commodity and processing route. Why it applies: Reported recovery of up to 85% for a heap leach route is strong. Evidence · text > It achieves recovery rates of up to 85% from primary sulphides **Heap Leach Route** Polarity: neutral Definition: Processing via heap leach — lower CAPEX and OPEX, lower recovery expected. Why it applies: The technology is deployed as a technology package for a heap leach pad. Evidence · text > The deployment involves the design and delivery of a technology package for a heap leach pad **QP/CP Signed** Polarity: positive Story-specific tag Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: Dr. Stephen Twyerould, a Fellow of AUSIMM, is identified as the Qualified Person. Evidence · text > Dr. Stephen Twyerould, Fellow of AUSIMM, President and CEO of the Company is a Qualified Person ## Extracted facts Stored fact records: 3. Some facts used in scoring do not have a stored record. ## Metallurgical Results (3) ### heap leach [Link to this fact](https://atlas-staging.minestarters.com/news/gunnison-copper-announces-that-rio-tinto-s-nuton-technology-produces-first-coppe--53f6b3c9-0bfa-4ca1-b776-00796d2d8e86#fact-metallurgical-facts-0) copper #### Identity - Commodity: copper - Ticker: GCU #### Test Work - Program Status: optimization - Test Type: heap leach - Processing Route: heap leach using Nuton bioleaching technology - Sample: Nuton technology demonstration at Johnson Camp mine #### Recovery - Recovery: 85 % - Recovery Basis: actual\_test #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2025-12-04T00:00:00.000Z Reasoning: High recovery rate reported for a bioleaching heap leach process on primary sulphides. - Positive factor: 85% recovery from primary sulphides is strong for a heap leach route Evidence · text > It achieves recovery rates of up to 85% from primary sulphides ### Fact 2 [Link to this fact](https://atlas-staging.minestarters.com/news/gunnison-copper-announces-that-rio-tinto-s-nuton-technology-produces-first-coppe--53f6b3c9-0bfa-4ca1-b776-00796d2d8e86#fact-metallurgical-facts-1) copper #### Identity - Commodity: copper - Ticker: GCU #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2025-12-04T00:00:00.000Z Reasoning: Standard measured resource component of the Gunnison Project. - Positive factor: Measured resource provides high geological confidence Evidence · text > Measured Mineral Resource of 191.3 million tons at 0.37% ### Fact 3 [Link to this fact](https://atlas-staging.minestarters.com/news/gunnison-copper-announces-that-rio-tinto-s-nuton-technology-produces-first-coppe--53f6b3c9-0bfa-4ca1-b776-00796d2d8e86#fact-metallurgical-facts-2) copper #### Identity - Commodity: copper - Ticker: GCU #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2025-12-04T00:00:00.000Z Reasoning: Standard indicated resource component of the Gunnison Project. - Positive factor: Large indicated resource base Evidence · text > Indicated Mineral Resource of 640.2 million tons at 0.29% ## How Atlas produces this analysis Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.