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Antimony Ridge Mine Project

All dates below are specific to the schedule of the Environmental Review and Permitting processes for this project.

Planned

ENVIRONMENTAL REVIEW AND PERMITTING STATUS
PLANNED

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ESTIMATED COMPLETION DATE OF ENVIRONMENTAL REVIEW AND PERMITTING
PENDING

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ENVIRONMENTAL REVIEW AND PERMITTING PROCESSES
COMPLETED

Mining

SECTOR
Mining

transparency icon

CATEGORY
Project Category FAST-41 Transparency Projects

Department of Agriculture

LEAD AGENCY
Department of Agriculture, US Forest Service

Description:

Antimony Ridge is a bulk sample mining program to extract near surface, high grade antimony in Valley County, ID, approximately 3 miles southeast of the town of Yellow Pine. Antimony Ridge is located on federal lode claims located within the Boise and Payette National Forests. 

The project is a restart of a past-producing antimony mine to provide a near-term supply of antimony to help meet the U.S. government’s stated goal of establishing a domestic source of critical metals. The project intends to extract near-surface, high-grade Antimony located within the historically disturbed pits that will be processed in a mobile plant or at a third processing facility.  The project includes: (1) the extraction of a minimum of 500 tons of high-grade Antimony ore from the historic pit area, having an Antimony grade in the range of 20% to 50% via a large-scale bulk sampling program, and (2) approximately 250 development drill holes. The majority of drilling will be conducted from existing and historic roads, with certain sites being only helicopter-accessible due to terrain.

This project is posted in the interest of transparency and response to Executive Order 14241. A permitting timetable will be posted on or before April 21, 2026.