Bahrenberg

The Bahrenberg is a gold and silver 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: Bahrenberg
Secondary: Treasure Box
Secondary: Hottentot

Commodity

Primary: Gold
Primary: Silver
Secondary: Zinc
Secondary: Lead

Location

State: Alaska
District: Anchorage

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Low-sulfide Au-quartz vein, Chugach-type

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: The intrusive rocks have undergone argillic alteration.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Galena
Ore: Gold
Ore: Pyrite
Ore: Silver
Ore: Sphalerite
Gangue: Calcite
Gangue: Quartz

Comments

Comment (Exploration): Status = Inactive

Comment (Reserve-Resource): Reserves = Reserves are about 344 tons (Jansons and others, 1984).

Comment (Geology): Geologic Description = Quartz veins cut the country rock of Late Cretaceous argillite of the Valdez Group, which strikes N 25 W, and dips 45 E. Blocks or lenses of argillically altered quartz diorite, which are greater than 6 feet in diameter, intrude the argillite. The main quartz-calcite vein strikes N 80 W, and dips 80 N. The average width is about 8 inches, but the vein has only been prospected to a depth of a few feet. It is possible to trace the vein about 75 feet along the outcrop. The quartz-calcite veins also carry arsenopyrite, pyrite, galena, and sphalerite, with a few spots of visible gold. In one vein, gold is associated with arsenopyrite and the galena is Au-poor; in another vein the reverse is true - the galena is rich and arsenopyrite valueless. Sphalerite is commonly associated with galena. Surface prospecting has revealed several other small veins that strike nearly west and dip 70 N. Four samples averaged 1.65 oz/ton Au and 1.68 oz/ton Ag (Jansons and others, 1984).

Comment (Workings): Workings / Exploration = Development includes a 65 foot long adit, a small surface cut, and an arrastre that was built on the property in 1931 (Park, 1933). Four samples averaged 1.65 oz/ton Au and 1.68 oz/ton Ag. Moderate potential for a small mine (Jansons and others, 1984).

Comment (Production): Production Notes = Seven tons of ore was shipped to Tacoma smelter previous to 1933. One lot of 1,500 lbs returned $145 after smelter and shipping charges (Park, 1933). Recorded production is 54 oz gold and 21 oz silver (Jansons and others, 1984).

Comment (Reference): Primary Reference = Park, 1933

Comment (Deposit): Other Comments = This site orginally called the Treasure Box claim.

Comment (Deposit): Model Name = Chugach-type low-sulfide Au-quartz veins (Bliss, 1992; model 36a.1)

Comment (Geology): Age = Tertiary or younger

References

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Anchorage quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-409, 1 sheet, scale 1:250,000.

Reference (Deposit): Park, F.C., 1933, The Girdwood District, Alaska: U.S. Geological Survey Bulletin 849-G, p. 381-424.

Reference (Deposit): Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, Southcentral Alaska: U.S. Bureau of Mines Open-File Report 5-84, 218 p., 2 sheets, scale 1:250,000.

Reference (Deposit): Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in the Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 p.

Reference (Deposit): Capps, S.R., 1916, Gold mining in the Willow Creek district: U.S. Geological Survey Bulletin 642-G, p. 147-194, 195-200.

Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Reference (Deposit): Martin G.C., Johnson, B.L., and Grant, U.S., 1915, Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, 243 p.

Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

Reference (Deposit): Clark, S.H.B., and Yount, M.E., 1972, Reconnaissance geologic map and geochemical analyses of stream-sediment and rock samples of the Anchorage A-6 Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map 351, 2 sheets, scale 1:63,360.

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