Rio Tinto progresses studies for underground mining at Kennecott
(Posted on 26/07/21)
Rio Tinto has approved a $108 million investment in underground development to enable early orebody access and undertake orebody characterisation studies for underground mining at the Kennecott copper operations in the United States.
The investment builds on $25 million approved in early-2020 to complete a pre-feasibility study to determine the viability of underground mining operations at Kennecott. Potential underground mining would occur concurrently with open pit operations and result in increased copper output.
Kennecott holds the potential for a significant and attractive underground development, with declared Mineral Resources of 20 Mt at 3.65% copper and 1.62 g/t gold1 with further upside potential based on drilling.
The feasibility study work will focus on gathering critical geological, geotechnical and hydrogeological data to inform Rio Tinto’s assessment of underground development options and is expected to be completed in 2024. Existing infrastructure from previous underground projects will be extended to access the North Rim Skarn orebody, allowing for the development of crosscuts and further drilling of the resource. The project includes approximately 15,000 feet (4,500 metres) of lateral development, 1,000 feet (300 metres) of vertical development and associated support infrastructure.
The project will also include the trial of underground battery electric vehicles to reduce carbon emissions at Kennecott and across Rio Tinto’s global operations. Sandvik Mining and Rock Solutions will supply a battery electric haul truck and loader to evaluate performance and suitability for future underground mining fleets.
Pre-feasibility studies are also being progressed to extend open pit mining at Kennecott beyond 2032, with a further push back of the North Wall to allow access to Mineral Resources. This follows a $1.5 billion investment in the second phase of the South Wall Pushback project, approved in 2019, to allow open cut mining to continue between 2026 and 2032.
Rio Tinto Copper Chief Executive Bold Baatar said: “Kennecott holds a range of options to extend our supply of copper and other critical materials, to meet the strong demand being driven by electric vehicles and renewable power technologies.
“The operation is uniquely positioned to supply these emerging markets, with one of only two operating smelters in the United States that also processes concentrates from third parties, a long history delivering high quality products and significant resources that are yet to be developed.”
Latest News
SSAB delivers decarbonised steel to Vattenfall’s solar park project in Germany
(Posted on 29/05/26)SSAB is supplying decarbonised steel to Vattenfall for the construction of the ground-mounted solar... Read more
NGFA statement on STB’s decision to conditionally accept rail merger application
(Posted on 29/05/26)In accordance with the Surface Transportation Board’s merger rules, the Board has conditionally... Read more
EU feed production market forecast highlights continued stability
(Posted on 25/05/26)FEFAC market experts are forecasting continued stability in the EU compound feed production market for... Read more
Fertilizer Action Plan: recognition must now translate into delivery
(Posted on 22/05/26)Fertilizers Europe has acknowledged the European Commission’s Fertilizer Action Plan, which recognises... Read more
Tripartite MOU to establish direct U.S.–DRC cobalt supply chain
(Posted on 14/05/26)Entreprise Générale du Cobalt, EVelution Energy LLC and Trafigura Pte Ltd. has announced... Read more
Commissioning of Oxelösund electric arc furnace delayed due to permitting
(Posted on 14/05/26)SSAB’s conversion of the mill in Oxelösund to fossil-free production is being delayed due... Read more
YEC agreement supports decarbonisation of Rio Tinto’s Pilbara iron ore operations
(Posted on 11/05/26)Yindjibarndi Energy Corporation (YEC), one of Australia’s largest Indigenous-led renewable energy... Read more
ASA Vice President urges caution in USTR Section 301 investigation
(Posted on 11/05/26)Soybean farmers are already facing significant economic headwinds and new trade actions could add further... Read more
ADM investment to upgrade Clinton, Iowa, corn processing facility
(Posted on 11/05/26)ADM, a global leader in innovative solutions from nature, has announced a multimillion-dollar investment... Read more
JV in Bayuquan, China to strengthen global raw material supply chains
(Posted on 04/05/26)CREMER ERZKONTOR GmbH has announced the official opening of its joint venture, CREMER (Yingkou) Supply... Read more
