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Unnamed Occurrence (ARDF - GO010; tributary to Trail Creek), Bristol Bay Region District, Dillingham Census Area, Alaska, USAi
Regional Level Types
Unnamed Occurrence (ARDF - GO010; tributary to Trail Creek)- not defined -
Bristol Bay Region District- not defined -
Dillingham Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
59° 56' 23'' North , 159° 53' 24'' West
Latitude & Longitude (decimal):
59.93972,-159.89000
GeoHash:
G#: b6wkcxewh
GRN:
N40W61
Köppen climate type:
Dfc : Subarctic climate
Mindat Locality ID:
200734
Long-form identifier:
mindat:1:2:200734:5
GUID (UUID V4):
0


Location: This occurrence is in an unnamed west tributary to Trail Creek, about 7 miles northeast of Kagati Lake and 2 miles north of the Kagati Lake prospect (GO011). The map site is at an elevation of about 1,800 feet in the SW1/4 of section 2, T 3 S, R 62 W, of the Seward Meridian. It is area 3 of Kilburn and others (1992), and is approximately located, perhaps within 1 mile.
Geology: This occurrence is in hornfels near the contact of an Upper Cretaceous granitic stock (Hoare and Coonrad, 1978). Reconnaissance stream-sediment and pan concentrate samples from the area contain anomalous levels of several elements (Kilburn and Jones, 1992; Jones and Kilburn, 1992). Silicified hornfels contains disseminated pyrite and pyrite-, arsenopyrite-, and tourmaline-bearing quartz veins. Clay alteration and weakly disseminated pyrite characterize some iron-stained outcrops. Rock samples of altered and mineralized hornfels contain up to 0.28 ppm Ag, greater than 3,800 ppm As, 0.15 ppm Au, greater than 2,000 ppm B, 11 ppm Bi, greater than 5,000 ppm Mn, 5.4 ppm Sb, and 230 ppm Zn (Kilburn and others, 1992).
Workings: Only reconnaissance surface observations and sampling have been completed in the area.
Age: Late Cretaceous. The mineralization is assumed to be related to the Upper Cretaceous granitic stock, which yielded a K/Ar age of 71.1 +/- 2.1 Ma on biotite (Hoare and Coonrad, 1978).
Alteration: Silicification, clay alteration, and oxidation.

Commodities (Major) - Au; (Minor) - Ag, As, B, Bi, Sb, Zn
Development Status: None
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c)

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


3 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘPyrite2.EB.05aFeS2
ⓘArsenopyrite2.EB.20FeAsS
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Unclassified
ⓘ'Clay minerals'-
ⓘ'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z

List of minerals for each chemical element

BBoron
Bⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
OOxygen
Oⓘ QuartzSiO2
Oⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
SiSilicon
Siⓘ QuartzSiO2
SSulfur
Sⓘ ArsenopyriteFeAsS
Sⓘ PyriteFeS2
FeIron
Feⓘ ArsenopyriteFeAsS
Feⓘ PyriteFeS2
AsArsenic
Asⓘ ArsenopyriteFeAsS

Other Databases

Link to USGS - Alaska:GO010

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

Hoare, J.M., and Coonrad, W.L., 1978, Geologic map of the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-B, 2 sheets, scale 1:250,000. Jones, J.L., and Kilburn, J.E., 1992, Geochemical map showing the distribution of selected elements in heavy-mineral-concentrate samples from the Goodnews Bay, Hagemeister Island, and Nushagak Bay quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2186, 2 sheets, scale 1:250,000. Kilburn, J., Box, S.E., Goldfarb, R.J., and Gray, J.E., 1992, Geochemically anomalous areas in the eastern Goodnews Bay 1 degre x 3 degree quadrangle, southwest Alaska, in Bradley, D.C., and Ford, A.B., eds., Geologic studies by the U.S. Geological Survey in 1990: U.S. Geological Survey Bulletin 1999, p. 156-162. Kilburn, J.E., and Jones, J.L., 1992, Geochemical map showing the distribution of selected elements determined in stream-sediment samples from the Goodnews Bay, Hagemeister Island, and Nushagak Bay quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2355, 2 sheets, scale 1:250,000.
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