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Barrick Goldstrike Tailings Basin

Customer: Barrick Goldstrike
Order date: 07/03/2012
Completion: 02/22/2013

Xylem’s role: Designer, fabricator, installer, engineering review, commissioning

Xylem’s scope:

  • HL250M 400HP Dri-Prime
  • 5kV Arch-flash rated disconnect
  • 1500kVA Substation Class 4160V/480V transformer
  • 480V Distribution Panel
  • Power, voltage monitoring
  • 400HP VFD
  • Specific pumps/products used and service/people on the job

Issue

On Christmas Eve 2011, at the Barrick Goldstrike Tailing Basin, a floating turbine pumping system failed and sank. Godwin distributors Pac Machine and S&G Electric Motor Repair, along with the Xylem branch in Helena, MT, mobilized Godwin Dri-Prime pumps. The diesel and VFD-controlled electric driven pumps would get the needed process water flowing to the mill. Within two days post-failure, the system was set up and running and the plant was once again operational.
 
Barrick requested a quote for a permanent portable pumping solution with 4160V power to deliver 4000 GPM to the autoclave and 7000 GPM to the Roaster. The system needed to be portable; since the water level in the tailings basin rises approximately ten feet every four months, the power control system needs to be raised 30 feet per year.

Solution

Early in the design review, Xylem evaluated the use of 4160V power to meet the mine’s demands. We determined that using 480V power would result in a million dollar savings to the operation. After this decision, we worked to redesign the system plans to accommodate this voltage step-down.
 
Xylem designed a complete portable E-House (electric control building) to step the voltage down from 4160V to 480V, distribute the 480V power, monitor and deliver power to three 400HP VFDs, and power three Godwin Dri-Prime HL250M 400HP pumps. The pumpsets have extended skids to support the loading of floating 16″ HDPE suction pipe in a dynamic environment.

Result

The project had a very successful installation and startup of the equipment, due in large part to the cooperation between Xylem, our Godwin distributors, and Barrick. Our plan to utilize 480V power, while not the original request from the customer, proved to be an ideal solution for the project
 
Barrick was so pleased with the final product we were asked to supply a design for the next phase of the project, and sold them three additional Godwin Dri-Prime pumps.

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