2025-19262: Clean Air Act Operating Permit Program; Order on Petition for Objection to State Operating Permit for the South32 Hermosa Project
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The Environmental Protection Agency (EPA) Administrator signed an order dated May 30, 2025, granting in part and denying in part a petition dated September 13, 2024, from the Center for Biological Diversity, Patagonia Area Resource Alliance, Sierra Club, Arizona Mining Reform Coalition, Calabasas Alliance/La Alianza Calabasas, and Friends of the Santa Cruz River. The Petition requested that the EPA object to a Clean Air Act (CAA) title V operating permit issued by the Arizona Department of Environmental Quality (ADEQ) to South32 Hermosa Project ("Hermosa") for its zinc, lead, manganese, and silver mine in Santa Cruz County, Arizona.
The agency’s own summary, as published.
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