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Unnamed Occurrence (ARDF - WI132; near southwest end of Midnight Dome), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types
Unnamed Occurrence (ARDF - WI132; near southwest end of Midnight Dome)- not defined -
Koyukuk Mining DistrictMining District
Yukon-Koyukuk Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
67° 27' 15'' North , 150° 5' 52'' West
Latitude & Longitude (decimal):
67.45417,-150.09778
GeoHash:
G#: bevr8rwjh
GRN:
N45W45
Köppen climate type:
Dfc : Subarctic climate
Mindat Locality ID:
201950
Long-form identifier:
mindat:1:2:201950:8
GUID (UUID V4):
0


Location: This occurrence is at an elevation of 3,700 feet, 0.2 mile west of hill 3860 on the south end of Midnight Dome. The location is accurate.
Geology: This occurrence consists of sulfide-bearing quartz veins in schist or quartzite (Eden, 2000). A sample of vein quartz found in float contains pyrite, malachite, and limonite, 179 ppb gold and 1,469 ppm copper. A sample of quartz vein collected in place contains pyrite and limonite, and 532 ppb gold. Eden (2000) interprets this occurrence as an extension of the system of auriferous quartz veins in the Nolan area. The rocks in the area are Upper Devonian chloritic schist and chloritic quartzite (Eden, 2000).
Workings: Only limited surface sampling and geologic mapping.
Alteration: Iron-oxide alteration.

Commodities (Major) - Au; (Minor) - Cu
Development Status: None
Deposit Model: Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)

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


4 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGold ?1.AA.05Au
Group 2 - Sulphides and Sulfosalts
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘMalachite5.BA.10Cu2(CO3)(OH)2

List of minerals for each chemical element

HHydrogen
Hⓘ MalachiteCu2(CO3)(OH)2
CCarbon
Cⓘ MalachiteCu2(CO3)(OH)2
OOxygen
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ QuartzSiO2
SiSilicon
Siⓘ QuartzSiO2
SSulfur
Sⓘ PyriteFeS2
FeIron
Feⓘ PyriteFeS2
CuCopper
Cuⓘ MalachiteCu2(CO3)(OH)2
AuGold
Auⓘ GoldAu

Other Databases

Link to USGS - Alaska:WI132

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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

Eden, K., 2000, Geology and gold mineralization of the Nolan area in the Brooks Range, Alaska: U.S. Bureau of Land Management Open-File Report 78, 87 p. Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Williams, E.M., 1999, Mineral investigations in the Koyukuk mining district, northern Alaska--Progress Report: U.S. Bureau of Land Management Open-File Report 74, 158 p.
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