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Successful Permitting of Expansion to the 2nd Tallest Centerline-Construction Tailings Dam in the World

Custer County, Idaho, USA

Client Thompson Creek Mining Company
Industries Mining
Services Geotechnical Engineering, Permitting, Tailings Management, & Stakeholder Engagement, Seismic Analysis; Detailed Design

To design a 100-million-ton expansion to the existing Bruno Creek Tailings Impoundment at a molybdenum mine located in  seismically active Custer County, Idaho.  At the start of the Phase 8 expansion project, the existing tailings dam height of 550 feet made it the second tallest centerline-raise cycloned sand dam in the world.  It will reach nearly 750 feet following the Phase 8 expansion.

Our Role
The results of the alternatives evaluation required partial realignment of the dam crest at the left abutment, resulting in a short length of the dam being constructed over an existing tailings beach.  Further, the Phase 8 design incorporated steepening of the downstream dam slope from 3H:1V to 2.75H:1V, as well as construction of a 40-foot raise on the existing Rock Toe Dam. The project met regulatory requirements, achieving a permit from the Idaho Department of Water Resources (IDWR) in early 2008.

Associated Services

Ground Engineering Services
From initial investigations through to design, construction, operation and closure, Golder provides integrated geotechnical services to...

Mine Waste Management Services
On a daily basis, Golder's environmental and engineering professionals work with mines around the world to design, build, operate, and close...

Permitting Services
With a solid foundation in environmental engineering and consulting, Golder's scientists, engineers, regulatory professionals and public...

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