Hermosa Critical Minerals Project
The proposed underground mine project would continue the historic production of minerals within the Patagonia Mountains. The primary minerals targeted by the proponent, South32, are manganese and zinc, identified by USGS as critical minerals.
Project Summary
Location Summary:
Patagonia Mountains - Huachuca Ecosystem Management Area - Sierra Vista Ranger District - Santa Cruz County - Arizona
Project Milestones:
| Milestone | Date |
|---|---|
| NOI in Federal Register | 05/10/2024 |
| DEIS NOA in Federal Register | 05/09/2025 |
| FEIS NOA in Federal Register | 02/2026 (Estimated) |
| Objection Period Start | 02/2026 (Estimated) |
| Decision | 07/2026 (Estimated) |
| Implementation | 09/2026 (Estimated) |
Expected Analysis Type:
Environmental Impact Statement
Special Authority:
Not Applicable / Other
Lead Management Unit:
Coronado National Forest All Units
Notice and Comment Regulation:
218 (2013) Non-HFRA
Project Purpose:
Minerals And Geology
Project Activity:
Facility Improvements/Construction; Facility Maintenance; Minerals Or Geology Plans Of Operations; Road Maintenance; Road Improvements/Construction
Current Status:
In Progress
Forests:
Coronado National Forest
Districts:
Sierra Vista Ranger District
States:
Arizona
Counties:
Santa Cruz
Legal Land Description:
Not Applicable
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Deborah Bradley
300 W. Congress Street
Tucson, AZ 85701
5203888345
Deborah.Bradley@usda.gov
Last Updated: 5/9/2025