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Fort Knox Gold Mine, Fairbanks North Star Borough, Alaska, USA

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Latitude & Longitude (WGS84): 64° 59' 57'' North , 147° 20' 11'' West
Latitude & Longitude (decimal): 64.9992305556, -147.336291667

Located NE of Fairbanks on the north flank of Gilmore Dome, between Monte Cristo and Melba Creeks.

The Fort Knox gold deposit occurs in a granite body now commonly refered to as the Fort Knox Pluton. Gold occurs along margins of stockwork quartz veins and veinlets, on quartz-filled shear zones, and along fractures within the granite.

Discovered by a geologist walking behind a bulldozer on the Fort Knox claims, who picked up a piece of granite containing visible gold.

First gold bars were poured on Dec. 20, 1996. Total gold recovered as of Jan. 31, 2000 is 1,113,137 ounces. As of 2000, largest gold mine in Alaska, producing 1,000 ounces of gold from 36,000 to 44,000 tons of ore per day. Reserves are estimated at 186 million tons grading 0.027 ozs./ton, or 5.04 million ozs. The gold varies from 948 to 990 fine. Size of the open pit in 2000 was 3,000 feet by 5,000 feet.

Mineral List

17 valid minerals.


Mineralization age: Late Cretaceous : 93.4 Ma to 91.5 Ma

Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
   Late Cretaceous
ⓘ Molybdenite (youngest age)91.5 Ma
ⓘ Molybdenite (oldest age)93.4 Ma

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

0 - 2.588 Ma
Unconsolidated surficial deposits, undivided

Age: Pleistocene (0 - 2.588 Ma)

Description: Massive, homogeneous unconsolidated, well-sorted silt of eolian origin containing less than 10% clay, locally rich in organic silt and larger organic fragments. Inorganic components are angular grains of quartz, feldspar, and mica, locally cemented by iron oxides. It is buff to brown or gray, locally mottled. Organic silt is brown to grayish black

Lithology: Unconsolidated

Reference: Wilson, F.H., Hults, C.P., Mull, C.G, and Karl, S.M. (compilers). Geologic map of Alaska. doi: 10.3133/sim3340. U.S. Geological Survey Scientific Investigations Map 3340, pamphlet 196. [21]

Devonian - Cambrian
358.9 - 541 Ma
Sedimentary; Sedimentary: undivided

Age: Paleozoic (358.9 - 541 Ma)

Description: Eastern Alaska, Yukon, Mackenzie region, Yukon-Tanana upland

Comments: Orogen, magmatic arc/suite; Wilson & Hults, unpublished compilation, 2007-08

Lithology: Sandstone, siltstone, shale, limestone or metamorphosed equivalent

Reference: J.C. Harrison, M.R. St-Onge, O.V. Petrov, S.I. Strelnikov, B.G. Lopatin, F.H. Wilson, S. Tella, D. Paul, T. Lynds, S.P. Shokalsky, C.K. Hults, S. Bergman, H.F. Jepsen, and A. Solli. Geological map of the Arctic. doi:10.4095/287868. Geological Survey of Canada Map 2159A. [2]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


- USGS Open File Report 98-287 (Freeman,1998).
- Thompson, J.F.H., Sillitoe, R.H., Baker, T., Lang, J.R., and Mortensen, J.K. (1999): Intrusion-related gold deposits associated with tungsten-tin provinces. Mineralium Deposita 34, 323-334.

Mineral and/or Locality  
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