Fog

The Fog is a silver and gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Fog
Secondary: Steeple Mountain

Commodity

Primary: Silver
Primary: Gold
Secondary: Molybdenum
Secondary: Mercury
Secondary: Arsenic
Secondary: Copper

Location

State: Alaska
District: Aleutian Islands

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Epithermal vein, Creede

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: The volcanic rocks exhibit regional propylitic alteration and localized silicification and potassium flooding or secondary growth on primary feldspars. Quartz veins exhibit pyritization and silicification in the surrounding wall rock. Some pyrite-filled fractures show narrow kaolinite-epidote-sericite alteration envelopes. No argillic alteration has been recognized.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Molybdenite
Ore: Gold
Ore: Chalcopyrite
Gangue: Quartz

Comments

Comment (Geology): Age = Late Tertiary or younger.

Comment (Reference): Primary Reference = Randolph and Ellis, 1989

Comment (Workings): Workings / Exploration = In 1975 the Aleut-Quintana-Duval JV did reconnaissance mapping and sampling of this prospect as a followup of the discovery of numerous color anomalies. Analyses of 9 rock samples indicated values of up to 107 ppm copper, <0.01 ppm gold, 6.5 ppm molybdenum, 1.5 ppm silver, and 46 ppm zinc (Christie, 1974). Kennecott sampled and mapped in this general area in 1985 (Simpson, 1985). Battle Mountain Exploration in 1989 did detailed mapping, sampling and geophysics at this site. The sampling (141 rock-chip and 87 channel samples) gave values of up to 400 ppm arsenic, 8.1 ppm gold, 1600 ppb mercury, 90 ppm molybdenum, and 3.4 ounces per ton silver (Randolph and Ellis, 1989).

Comment (Exploration): Status = Inactive

Comment (Deposit): Other Comments = This site is on land conveyed, patented, or selected by the Aleut Native Corporation.

Comment (Geology): Geologic Description = This site is similar in character to the Wind prospect (ARDF number UK007) and is marked by a color anomaly measuring approximately 7000 x 4000 feet. Quartz veins are hosted by propylitized volcanic rocks of Tertiary age. The volcanic rocks exhibit localized silicification, especially near the quartz veins. Some 20 veins thicker than 6 inches were mapped by Battle Mountain Exploraton (Randolph and Ellis, 1989, pg. 21). These generally strike east-west or northwest, and crop out over distances of several hundred feet, although their actual length may be much greater. The quartz is usually white and contains few visible sulfides. The veins are enriched in arsenic, mercury, and molybdenum and locally in gold and silver. The highest metal values obtained are: 400 ppm arsenic, 107 ppm copper, 8.1 ppm gold, 1600 ppb mercury, 90 ppm molybdenum, 3.4 ounces silver per ton, and 46 ppm zinc (Christie, 1974; Randolph and Ellis, 1989).

Comment (Deposit): Model Name = Creede epithermal veins? (Cox and Singer, 1986; model 25b)

References

Reference (Deposit): Simpson, D.F., 1986, Aleutian Islands project, 1985 final report: Kennecott-Alaska Exploration Company, 54 p. (Report held by the Aleut Native Corporation, Anchorage, Alaska).

Reference (Deposit): Randolph, D.B., and Ellis, W.T., 1989, Unalaska project, 1989 final report: Battle Mountain Exploration Company, Alaska District, 41 p., 5 appendices, 11 plates, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

Reference (Deposit): Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)

Reference (Deposit): Bundtzen, T.K., Swainbank, R.C., Deagen, J.R. and Moore, J.L., 1990, Alaska's mineral industry 1989: Alaska Division of Geological and Geophysical Surveys Special Report 44, 100 p.

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