Owned and operated by South32, Hermosa is an advanced underground mine in the Patagonia Mountains of Southern Arizona. It is designed to responsibly produce zinc and manganese — critical minerals that power energy and strengthen national security.
Patagonia Town Council Updates – Presented by Pat Risner, South32 president
Water Monitoring – Antimony Presentation January 2026
Hermosa Project General Update July 2026
Technical Information – Prepared for South32 by independent firms
Monitoring and Mitigation Plan for GDEs and Wells prepared by Montgomery & Associates Jan 2026
