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Fort Knox Mine Carbon-in-Column Plant #2

Awards: 2015 Engineering Excellence Award from the American Council of Engineering Companies of Montana (ACEC MT), Industrial and Manufacturing Processes and Facilities Category

The Fort Knox Mine near Fairbanks, Alaska, was in need of a second plant to extract gold from solution in heap. Morrison-Maierle, Inc. provided engineering design, procurement assistance, and construction administration services to support the project.

The design included work on the 3,800-foot pipeline corridor to move solution from the heap to the plant and back to the heap. The process plant is designed to operate at an 8,000-gallons-per-minute flow through a grit screen, six carbon columns, and over three carbon safety screens. The building is a fully sprinkled, pre-engineered metal structure. The electrical design for the plant included a new standalone structure in the existing substation to feed the facility. The five new 600 horsepower vertical turbine pumps are operated using variable frequency drives from a remote control room.

The project also involved relocation of the mine’s cyanide storage facility, which was moved into the nearby Tails Thickener Building.

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