Neptune Occurrences, McGrath District, Yukon-Koyukuk Borough, Alaska, USA

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Location: The Neptune occurrences are located in an unnamed east-flowing tributary of Post River, at an elevation of 3,100 feet near the center of sec. 1, T. 25 N., R. 24 W., of the Seward Meridian. The location of the occurrences is derived from a rough sketch map made by Anaconda Minerals Company in 1981, and is considered to be accurate to within about one half kilometer.
Geology: The Neptune occurrences are a small cluster of unexplained but highly anomalous lead, zinc, and silver values (values unstated) in an area capped by the Late Cretaceous, Veleska Lake Volcanic field (Bundtzen, Harris, and Gilbert, 1997). Scattered occurrences of galena and sphalerite in fault-controlled quartz veins may be the source of these anomalies (Brewer and others, 1992).
Workings: The Neptune occurrences were found by the Anaconda Minerals Company in 1980 or 1981 (Brewer and others, 1992). High lead, zinc, and silver anomalies (unstated values) may be derived from galena-sphalerite quartz veins in the area, but more work is recommended.
Age: Unknown; may be related to Late Cretaceous, Veleska Lake Volcanic Field (Bundtzen, Harris, and Gilbert, 1997).
Reserves: None.

Commodities (Major) - Pb, Zn; (Minor) - Ag
Development Status: None

References

Brewer, N.H., Puchner, C.C., and Gemuts, I., 1992, Farewell district, southwest Alaska Range: North Pacific Mining Company prospectus report, 21 p. Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 p., 1 sheet, scale 1:125,000.

Mineral List

Galena

Sphalerite

2 entries listed. 2 valid minerals.