Gilt Edge Mine

⚠ Superfund · Cleanup underway

EPA divided the site into three operable units (OUs):

Location

CityLead
CountyLawrence County
StateSouth Dakota
Coordinates44.33232, -103.66873

Contaminants of concern

Contaminated media

Cleanup timeline

  1. Initial Assessment Completed — 09/29/2000
  2. Proposed to the National Priorities List — 05/11/2000
  3. Finalized on the National Priorities List — 12/01/2000
  4. Remedial Investigation Started — 09/27/1999
  5. Remedy Selected — 04/23/2001
  6. Remedial Action Started — 07/17/2001
  7. Construction Completed — Not Yet Achieved
  8. Deleted from National Priorities List — Not Yet Achieved
  9. Most Recent Five-Year Review — 07/05/2022
  10. Achieved Sitewide Ready for Anticipated Reuse — Not Yet Achieved

EPA references

EPA-regulated facilities nearby

Understanding this Superfund site

Gilt Edge Mine is a federal Superfund site in South Dakota. 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: Cleanup underway. Active cleanup is underway, meaning EPA has approved a remediation plan and work is in progress. Cleanup timelines vary widely — some sites take decades depending on contamination depth, groundwater involvement, and funding availability.

EPA has identified 7 contaminants of concern at this site, including arsenic, cadmium, copper. Contamination has been detected in surface water, soil.

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.