Stibnite Yellow Pine Mining Area

⚠ Superfund · Proposed for NPL

On January 15, 2021, EPA and the U.S. Forest Service entered into an Administrative Settlement Agreement and Order on Consent with Midas Gold Corporation (now Perpetua Resources) for limited cleanup of discrete areas of legacy contamination at the Stibnite Mine site.

Location

CityStibnite
CountyValley County
StateIdaho
Coordinates44.89250, -115.34528

Contaminated media

Cleanup timeline

  1. Initial Assessment Completed — 11/01/1985
  2. Proposed to the National Priorities List — 09/13/2001
  3. Finalized on the National Priorities List — Not Yet Achieved
  4. Remedial Investigation Started — 06/26/2002
  5. Remedy Selected — Not Yet Achieved
  6. Remedial Action Started — Not Yet Achieved
  7. Construction Completed — Not Yet Achieved
  8. Deleted from National Priorities List — Not Yet Achieved
  9. Most Recent Five-Year Review — Not Yet Achieved
  10. Achieved Sitewide Ready for Anticipated Reuse — Not Yet Achieved

EPA references

Understanding this Superfund site

Stibnite Yellow Pine Mining Area is a federal Superfund site in Idaho. The Superfund program, created by Congress in 1980, addresses sites where hazardous substances have been released or threaten release into the environment. EPA scores potential sites using the Hazard Ranking System; those that score high enough are placed on the National Priorities List.

Current status: Proposed for NPL. This site has been proposed for the National Priorities List but is not yet formally listed. Proposal triggers a public comment period. If listed, EPA conducts a remedial investigation to characterize contamination before selecting a cleanup approach.

Contamination has been detected in groundwater, soil, sediment, surface water, drinking water.

If you live near this site and have health concerns, your state health department can provide site-specific guidance. EPA maintains a community involvement program for most NPL sites, and site documents — including the Record of Decision, five-year reviews, and public health assessments — are typically available through EPA's Superfund site profile.