Stibnite Mine Stream Diversion and Temporary Storage Pond

Perpetua Resources, headquartered in Boise, Idaho, has been working on the Stibnite Mine Gold Project since 2010. This historic site includes one of the highest-grade, open pit gold deposits in the U.S. Perpetua has created a plan for this project based on the vision of redeveloping an abandoned mining site to produce gold and the critical mineral antimony. 

In early June 2022, Perpetua Resources awarded IMCO a water restoration and stream diversion contract at the Stibnite mining site. This contract was the first step in Perpetua’s plan to start the significant environmental uplift of this decommissioned mining site. IMCO helped Perpetua to prepare the site to bring the critical mineral animony to the U.S. market through this restoration contract.

IMCO’s scope for this contract included the diversion of two streams to a new temporary storage pond. The lined diversion for surface water stops it from coming into contact with contamination around the former mill and smelter site used by legacy mining operations. Work included placement of a stream bed liner to prohibit unwanted materials and contaminates from penetrating the stream bed and restoring the original streamflow. The project team also improved two access roads to the site, which are needed to accommodate heavy equipment.