After the production of over 7.5 million ounces, at 31 December 2019 Proven and Probable Reserves were 255.8 million tonnes 0.3 g/t gold for 2.80 million ounces.
The Fort Knox gold deposit had pre-production Proven and Probable Reserves in 1996 of 158.3 million tonnes 0.83 g/t gold with a 0.39 g/t gold cut-off for 4.2 million ounces. Gold, bismuth and tellurium minerals occur in pegmatite and quartz veins and fractures within the pluton. The pluton is described as "a light gray, fine grained granodiorite, medium grained biotite granite, and coarse grained, biotite granite porphyry, which form blocky bedrock exposures". The Fort Knox gold is hosted by a late- Cretaceous granite pluton that intruded into the surrounding Fairbanks Schist. In 1998, Amax Gold merged with Kinross Gold. Construction began 1995 with the first gold pour at the end of 1996. In 1992, Amax Gold purchased the property.
In 1986, the property was leased to various mining companies. There had been placer mining in the area as early as 1903 and in 1980 local prospectors Joe Taylor and George Johnson worked the placer deposits. Minor mining occurred with a small shaft and a three-head stamp mill.
The land that the Fort Knox mine sits on was originally staked in 1913 when a bismuth-bearing, gold-quartz vein was located.
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