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Fort Knox mine

11th July 2014

By: Sheila Barradas

Creamer Media Research Coordinator & Senior Deputy Editor

  

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Name: Fort Knox mine.

Location: The Fort Knox mine is situated in the Fairbanks North Star Borough, in Alaska, US.

Controlling Company: Kinross Gold.

Brief History: Kinross acquired a 100% interest in the Fort Knox mine in 1998. Construction of the Fort Knox mine and mill opera- tions began in 1995 and were completed in 1997. Commercial production at Fort Knox was achieved in March 1997, and the property has operated continuously since start-up.

Brief Description: The Fort Knox mine is located within the Fairbanks mining district, a north-east trending belt of lode and placer gold deposits that comprise one of the largest gold producing areas in the state of Alaska.

Geology/Mineralisation: The Fort Knox deposit is hosted by one of the west-northwest-trending, late-Cretaceous granitic complexes. The pluton is offset by two north-east structures, which display left-lateral strike slip movement. These structures, the Monte-Cristo Fault and Melba Fault, are regional in extent and offset the Gilmore Dome Pluton south of Fort Knox. The Fort Knox pluton comprises a light grey, fine-grained granodiorite, medium-grained biotite granite, and coarse-grained biotite granite porphyry, which form blocky bedrock exposures. The diverse textural and chemical granitic varieties and sharp to gradational intrusive contacts suggest the Fort Knox pluton is a multiphase intrusive. The local occurrences of orthoclase megacrysts, resorbed quartz phenocrysts and quartz glomero-phenocrysts support that observation.

Crenulated quartz layers (brain rock) and dendritic growths of quartz and potassium feldspar present in the Fort Knox pluton contacts help to evaluate intrusive paragenesis (Bakke, 1994).

The mineral deposits are generally situated in a north-east-trending, structurally complex zone characterised by a series of folds, shear zones, high-angle faults, and occasional low-angle faults. North-east-striking high-angle faults influence the location of gold deposits. The dominant structural zones in the Yukon-Tanana terrane are the north-bounding Tintina fault system and the south-bounding Denali fault system. North-east-trending faults and shear zones within the Yukon-Tanana terrane are related to movement along these major structures. The north-east structures, which display a strike-slip displacement, were important to the localisation of gold mineralisation.

Reserves: Total proven and probable reserves as at December 31, 2013, were 183.11-million tonnes, grading 0.49 g/t gold.

Resources: Total measured and indicated resources as at December 31, 2013, were 78.15-million tonnes grading 0.46 g/t gold. Inferred resources were 10.57-million tonnes grading 0.52 g/t gold.

Products: Gold.

Mining Method: Conventional openpit.

Major Infrastructure and Equipment: High-grade ore from the Fort Knox deposit is processed at the Kinross’s carbon-in-pulp mill located at the mine.

Fort Knox mines and stockpiles large volumes of low-grade ore and mineralised waste material that cannot be economically processed at the mill. A new heap-leach facility enables the mine to process some of these low-grade materials, as well as lower-grade ore that has not yet been mined.

Prospects: The Fort Knox mine has moved from contractors to self-perform mining, a decision aimed at saving money and building internal expertise.

Contact Person: VP investor relations Tom Elliot.

Contact Details:
Kinross Gold,
tel +1 416 365 5123,
fax +1 416 363 6622,
email info@kinross.com, and
website http://www.kinross.com.

Edited by Samantha Herbst
Creamer Media Deputy Editor

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