Superfund Site: FLAT CREEK IMM

Superfund Site Profile

The Montana Department of Environmental Quality (MDEQ) has released an Engineering Evaluation/Cost Estimate (EE/CA), which evaluated potential cleanup options that could be used to mitigate environmental issues identified at the site for the Flat Creek watershed (OU2). The EE/CA proposes removing mining impacted soils along Flat Creek and placing this material in the existing Wood Gulch mine waste repository.


The Flat Creek Iron Mountain Mine and Mill (IMM) site is located in and around the town of Superior in Mineral County, Montana. The mine operated from 1909 to 1930 and again from 1947 to 1953, producing silver, gold, lead, copper and zinc ores. Mining operations contaminated soil, groundwater and surface water with metals and other hazardous chemicals.