Flat Creek/Iron Mountain Mine NPL Site

State TrusteeFederal TrusteeAO Bureau

Also Known As

Incident Type




Case Status



near Superior, Mineral county


Contaminants of Concern Include

Affected DOI Resources Include

Migratory Birds, Threatened and Endangered Species

Financial Summary

Restoration Funds Collected:


*Restoration Funds Allocated:


*Restoration Funds Remaining:


* Restoration Funds can contain multiple settlements/projects. All collections are placed in interest bearing accounts. For detailed information on individual settlements/ projects please visit: NRDAR Status Report

Case Description

The Iron Mountain Site is part of the larger Flat Creek/Iron Mountain & Mill (IMM) federal superfund site that was added to the United States Environmental Protection Agency’s (USEPA) national priorities list in 2009. Under the Montana Settlement Agreement, in consultation with the United States Forest Service (USFS), the Montana Department of Environmental Quality (MDEQ) is the Lead Agency for the Iron Mountain Site remediation. Cleanup of the property owned by the Montana Environmental Custodial Trust (Custodial Trust) will be coordinated with the EPA-led superfund cleanup process at the Flat Creek/IMM NPL site. The United States Department of the Interior (USDOI) will address natural resource damages utilizing trust funds. The site contains multiple mine waste tailings piles found to have levels of arsenic, antimony, lead and manganese that may pose long-term risks to public health and the environment.

Town of Superior and Flat Creek, Credit: USEPA

Case Documents

 Document TypeDocument NameDocument Date


 Consent Decree Consent Decree 03/13/2009

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Case Contact

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