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MEI Online: Plant Operation News: North America: December 22nd 2009


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:: Gravity Goes Big at Fort Knox

November marked the successful commissioning of an expanded gravity circuit at Kinross's Fort Knox Mine in Alaska. The expansion consisted of the addition of a KC-XD70 Knelson Concentrator and a ConSep CS6000 Acacia Reactor.

"We conducted a complete gravity circuit audit in 2008 that resulted in a decision to expand our existing gravity circuit" stated Bob Musgrove; Process Manager at Fort Knox.

"Gravity recovery plays an important role at Fort Knox and we are always looking for ways to improve it. The implementation of this new equipment was done quickly and efficiently and with minimal disruption to the plant" added Musgrove.

Prior to this expansion at Fort Knox, the gravity circuit consisted of two Knelson KC-XD48 concentrators that have been in service since 2002 followed by shaking tables. The addition of the KC-XD70 and the CS6000 will essentially double the processing capacity of the gravity circuit from ~750tph to ~1500tph. This additional primary recovery effort combined with the high efficiency of the Consep Acacia Reactor is projected to increase gravity recovery by 5-8%.

The Fort Knox mill processes ~14 million tons per annum at a daily rate of 40,000tpd to produce in excess of 325,000 ounces of gold.




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