Superfund Site: BARKER HUGHESVILLE MINING DISTRICT
MONARCH, MT

Superfund Site Profile

A site-wide Remedial Investigation (RI) report was completed in June 2016. The RI report describes the nature and extent of contamination at the site and includes the human health and baseline ecological risk assessments.

SITE BACKGROUND

The 6,000 acre Barker Hughesville Mining District site is located south of Great Falls and about 12 miles east of Monarch in west-central Montana in Judith Basin and Cascade Counties. Rich silver and lead ores were discovered in the Barker Hughesville area in 1879. Mining activity occurred there until 1893 and again at the beginning of the 20th century through the 1940s.

The site contains about 46 known abandoned mines strewn with waste rock dumps, tailings and seeping mine openings. The abandoned mines have contaminated soil, sediment, groundwater and surface water with arsenic and metals such as copper, zinc, cadmium and lead.