Superfund Site Profile
The 53-square-mile Upper Tenmile Creek Mining Area site is located in Lewis and Clark County, just southwest of Helena, Montana. The site includes about 150 active and abandoned mines in the historic Rimini Mining District. Mining for gold, lead, copper and zinc began in the 1870s and continued through the 1930s. Waste rock containing heavy metals filled roads, yards and local waterways as filler material. The waste rock contaminated soil and groundwater with heavy metals. Remedy construction is underway.