work underway on a water-discharge structure we designed for poor soil conditions
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mine remediation and reclamation

mine remediation and reclamation
client
The Doe Run Company
location
Montana

analyzing environmental impacts at mines in Montana

Barr is working with The Doe Run Company to address environmental impacts associated with historical mining activities at its former Block P mill and mine sites in Montana. As part of this work, we're evaluating the impacts of metals leaching and acid rock drainage at six inactive mine sites. The primary concerns include mobilization of lead, zinc, and other metals to groundwater; direct human and environmental contact with low-pH materials; the impact of acidic drainage on surface-water bodies; and ongoing discharges of contaminated water from mine adits (horizontal passages to the surface).

Barr has assessed groundwater in the bedrock and alluvium and evaluated potential sources of inflow to the mine workings. We have also conducted a geotechnical evaluation of waste-rock piles at the site and assessed potential waste-rock repository locations. Consolidating waste rock in a central location and capping it with an engineered cover will minimize the potential for precipitation infiltration, reducing the likelihood that infiltrating water will become acidic drainage. We have completed a design for the repository, and construction will begin upon approval from the U.S. Environmental Protection Agency.