In a significant policy shift, President Donald Trump has overturned a Biden-era regulation aimed at limiting emissions from U.S. copper smelters. This regulation, finalized in May 2024, required stringent controls on pollutants including lead and mercury. Trump's decision offers a two-year exemption for compliance, aiming to alleviate economic pressures on domestic producers.

The White House defended the move as essential for enhancing American mineral security, citing the risk of accelerated industry closures and increased dependence on foreign processing capacities. The proclamation specifically addresses two U.S. smelters, operated by Freeport-McMoRan and Rio Tinto, though the immediate impacts remain unclear.

This decision follows an executive order identifying copper as crucial for

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