Location: The Empire prospect is located on Unga Island approximately 4,000 feet southwest of the lower adit portal of the Apollo mine (PM079) (Wilson and others, 1988, locality 33). The location is accurate to within 2,500 feet.
Geology: The Empire prospect is described as vuggy quartz veins, less than 0.5 inch wide, cutting iron-oxide-stained, silicified andesite (Wilson and others, 1988). The andesite is part of the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). By analogy with other deposits in the area, the veins presumably contain small amounts of gold or silver.
Workings: A 150-foot, south-trending adit is present on the prospect. In 1983 UNC Teton Exploration Drilling Company drilled three core holes for a total of 4,737 feet, conducted VLF and EM surveys, and trenched the prospect.
Age: Eocene or younger.
Alteration: The alteration consists of silicification of andesite.

Commodities (Major) - Ag, Au
Development Status: None
Deposit Model: Epithermal gold veins

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.

ⓘ Gold

ⓘ Silver

Mineral List

ⓘ Quartz

1 valid mineral.

Detailed Mineral List:

ⓘ Quartz

Formula: SiO₂

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂

List of minerals for each chemical element

O	Oxygen
O	ⓘ Quartz	SiO₂
Si	Silicon
Si	ⓘ Quartz	SiO₂

Other Databases

Link to USGS - Alaska:	PM080

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

Chugach DomainAccretionary Complex
East Aleutian ArcVolcanic Arc

USA

Alaska
- Alaska Peninsula Mining DistrictMining District

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References

Webber, B.S., Moss, J.M., Rutledge, F.A., and Sanford, R.S., 1946, Reconnaissance examinations of parts of the Alaska Peninsula and Aleutian Islands southwestern Alaska: U.S. Bureau of Mines, unpublished report of investigations, 40 p. (Report held by the U.S. Geological Survey, Anchorage.) Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 sheet, scale 1:250,000. Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., 1 plate, scale 1:250,000.

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