The Calabasas Alliance Newsroom

The Calabasas Alliance was formed by a group of concerned residents of Santa Cruz County, Az. The land, water, air, biodiversity, and public health of this region are all being threatened by the Hermosa Project’s mining activity in Patagonia, AZ, and the proposed Manganese Processing Center in Santa Cruz County.

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SOUTH32 Hermosa Mine Discharge Shows Antimony Above State Alert Level and Near Regulatory Limit, Raising Concerns About Water Quality Trends

December 7, 2025•Patagonia, AZ

According to EPA-reported Arizona Pollutant Discharge Elimination System (AZPDES) data, the October 31, 2025, sample measured 5.73 micrograms per liter (µg/L) of antimony – above the state Alert Level of 4.8 µg/L and just below the APP discharge limit of 6 µg/L.

Contact: Robin Lucky • [email protected] • 916-803-5697

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