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Fort Knox Gold Mine, Fairbanks North Star Borough, Alaska, USAi
Regional Level Types
Fort Knox Gold MineMine
Fairbanks North Star BoroughBorough
AlaskaState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
64° 59' 57'' North , 147° 20' 10'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Fox417 (2011)14.0km
Farmers Loop4,853 (2017)19.8km
Two Rivers719 (2011)19.9km
Badger19,482 (2011)24.0km
Fairbanks32,325 (2017)25.4km
Mindat Locality ID:
107448
Long-form identifier:
mindat:1:2:107448:5
GUID (UUID V4):
cd75aaad-3eba-485b-a00a-ab9c014a7de4


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.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


17 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Arsenopyrite
Formula: FeAsS
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Bismuth
Formula: Bi
Bismuthinite
Formula: Bi2S3
Calcite
Formula: CaCO3
Cassiterite
Formula: SnO2
'Garnet Group'
Formula: X3Z2(SiO4)3
Gold
Formula: Au
'K Feldspar'
Marcasite
Formula: FeS2
Microcline
Formula: K(AlSi3O8)
Molybdenite
Formula: MoS2
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Orthoclase
Formula: K(AlSi3O8)
Pyrite
Formula: FeS2
Pyrrhotite
Formula: Fe1-xS
Quartz
Formula: SiO2
Quartz var. Chalcedony
Formula: SiO2
Scheelite
Formula: Ca(WO4)
'Stilbite Subgroup'
Formula: M6-7[Al8-9Si27-28O72] · nH2O
Tetradymite
Formula: Bi2Te2S
'Wolframite Group'

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Bismuth1.CA.05Bi
Group 2 - Sulphides and Sulfosalts
Pyrrhotite2.CC.10Fe1-xS
Bismuthinite2.DB.05Bi2S3
Tetradymite2.DC.05Bi2Te2S
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Marcasite2.EB.10aFeS2
Arsenopyrite2.EB.20FeAsS
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var. Chalcedony4.DA.05SiO2
Cassiterite4.DB.05SnO2
'Wolframite Group'4.DB.30 va
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Orthoclase9.FA.30K(AlSi3O8)
Microcline9.FA.30K(AlSi3O8)
Albite9.FA.35Na(AlSi3O8)
Unclassified
'Stilbite Subgroup'-M6-7[Al8-9Si27-28O72] · nH2O
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
'K Feldspar'-
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
CCarbon
C CalciteCaCO3
OOxygen
O AlbiteNa(AlSi3O8)
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
O CalciteCaCO3
O CassiteriteSnO2
O Quartz var. ChalcedonySiO2
O MicroclineK(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O OrthoclaseK(AlSi3O8)
O QuartzSiO2
O ScheeliteCa(WO4)
O Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
O Garnet GroupX3Z2(SiO4)3
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
NaSodium
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Al AlbiteNa(AlSi3O8)
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al OrthoclaseK(AlSi3O8)
Al Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
SiSilicon
Si AlbiteNa(AlSi3O8)
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Si Quartz var. ChalcedonySiO2
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si OrthoclaseK(AlSi3O8)
Si QuartzSiO2
Si Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Si Garnet GroupX3Z2(SiO4)3
SSulfur
S ArsenopyriteFeAsS
S BismuthiniteBi2S3
S MarcasiteFeS2
S MolybdeniteMoS2
S PyriteFeS2
S PyrrhotiteFe1-xS
S TetradymiteBi2Te2S
KPotassium
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
K OrthoclaseK(AlSi3O8)
CaCalcium
Ca CalciteCaCO3
Ca ScheeliteCa(WO4)
TiTitanium
Ti BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Fe ArsenopyriteFeAsS
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fe MarcasiteFeS2
Fe PyriteFeS2
Fe PyrrhotiteFe1-xS
AsArsenic
As ArsenopyriteFeAsS
MoMolybdenum
Mo MolybdeniteMoS2
SnTin
Sn CassiteriteSnO2
TeTellurium
Te TetradymiteBi2Te2S
WTungsten
W ScheeliteCa(WO4)
AuGold
Au GoldAu
BiBismuth
Bi BismuthBi
Bi BismuthiniteBi2S3
Bi TetradymiteBi2Te2S

Geochronology

Mineralization age: Late/Upper Cretaceous : 93.4 Ma to 91.5 Ma

Important note: This table is based only on rock and mineral ages recorded on mindat.org for this locality 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
Phanerozoic
 Mesozoic
  Cretaceous
   Late/Upper Cretaceous
ⓘ Molybdenite (youngest age)91.5 Ma
ⓘ Molybdenite (oldest age)93.4 Ma

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Fort_Knox_Gold_Mine
Wikidata ID:Q5471439

Other Regions, Features and Areas containing this locality


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.

References

 
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