U.S. President Donald Trump has overturned a Biden‑era regulation on air pollution from copper smelters, granting a two‑year exemption from compliance for the affected facilities. The “copper rule,” finalized in May 2024, had imposed stricter limits on emissions of pollutants such as lead, arsenic and mercury. The White House said the exemption would promote American mineral security by reducing regulatory burdens on domestic copper producers.
The proclamation specifically references the two copper smelters in the United States, operated by Freeport‑McMoRan and Rio Tinto. While it is clear that the order will apply to Freeport’s smelter, the impact on Rio Tinto’s facility is not immediately apparent. Both companies have not yet responded to requests for comment.
The move is part of a broader effort by the Trump administration to boost domestic copper production and lessen reliance on foreign suppliers. Earlier this year, the President signed an executive order designating copper as a critical material for defense, infrastructure and emerging technologies, including clean energy and electric vehicles. That order triggered a Section 232 investigation into the national‑security risks posed by copper imports. After the review, the administration imposed a 50 % tariff on certain imported copper and required a growing share of high‑quality U.S. scrap copper to be sold domestically.
The latest exemption is intended to support the domestic copper industry, which is viewed as essential to the country’s industrial base and mineral independence. Reversing the Biden‑era rule has significant implications for the U.S. copper sector and the nation’s efforts to reduce dependence on foreign suppliers. As the Trump administration continues to prioritize American mineral security, further developments are likely to emerge in the coming months. The exemption will remain in effect for two years, during which time the affected facilities will not be required to meet the stricter emissions limits imposed by the previous administration.
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