US bans mining in parts of Minnesota, dealing latest blow to Antofagasta's copper project

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US bans mining in parts of Minnesota, dealing latest blow to Antofagasta's copper project
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US bans mining in parts of Minnesota, dealing latest blow to Antofagasta's copper project copper mining environment USA criticalminerals

The US Interior Department on Thursday blocked mining in part of northeast Minnesota for 20 years, the latest blow to Antofagasta's Twin Metals copper and nickel mining project but a step officials said is needed to protect the state's vast network of interconnected waterways.

"With an eye toward protecting this special place for future generations, I have made this decision using the best available science and extensive public input," said Interior Secretary, who signed an order on Thursday morning withdrawing 225,504 acres in the Superior National Forest from leasing to mining or geothermal companies through 2043.

The underground Twin Metals mine would, if built, be a major US source of copper and nickel. The only existing US nickel mine is set to close by 2025. Antofagasta sued last August, claiming the decision was "arbitrary and capricious." The leases were first granted in 1966 and have been passed between successor companies. No mining has taken place at the site, near the town of Ely. Thursday's move deals another roadblock to the project, regardless of the court's decision.

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