Brenner

The Brenner is a zinc, lead, molybdenum, 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: Brenner

Commodity

Primary: Zinc
Primary: Lead
Primary: Molybdenum
Primary: Gold
Secondary: Copper

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: Prospect
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 deepest oxidation evident is 30 ft below collar of shaft. Most oxidation is above modern water table (Park, 1933).

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Copper
Ore: Gold
Ore: Galena
Ore: Arsenopyrite
Ore: Marcasite
Ore: Sphalerite
Ore: Pyrrhotite
Ore: Pyrite
Ore: Molybdenite
Gangue: Quartz
Gangue: Calcite

Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = Country rock is Late Cretaceous coarse-grained, massive graywacke of the Valdez Group. Two quartz-calcite veins, averaging 6 in thick, carry galena, sphalerite, pyrite, pyrrhotite, arsenopyrite, molybdenite (?), and marcasite. One vein strikes at N 45 W, and dips 65 N, while the other vein strikes N 35 E. Chalcopyrite and marcasite occur as veinlets in massive pyrrhotite. Pyrrhotite is also found in veinlets with arsenopyrite. Native copper is also reported to be present (Park, 1933).? According to Jansons and others (1984), chip samples contained up to 0.12 oz/ton Au and up to 0.27 oz/ton Ag. Grab samples contained 0.52 oz/ton Au and 0.50 oz/ton Ag. Some samples contain up to 148 ppm Mo, 0.14 percent Cu, and 0.3 percent As.

Comment (Commodity): Ore Material = Copper (native)

Comment (Workings): Workings / Exploration = Park (1933) reports exploration by 175 foot drift along the west vein and a 54 foot inclined shaft with two levels that run along east vein for 80 feet (upper for 30 feet - lower for 50 feet); total underground workings equal 309 feet. Brenner was only prospect in area that has been opened below water table. According to Jansons and others (1984), chip samples contained up to 0.12 oz/ton Au and up to 0.27 oz/ton Ag. Grab samples contained 0.52 oz/ton Au and 0.50 oz/ton Ag. Some samples contain up to 148 ppm Mo, 0.14 percent Cu, and 0.3 percent As.

Comment (Reference): Primary Reference = Park, 1933

Comment (Reserve-Resource): Reserves = Reported to have moderate mineral development potential for a small mine (Jansons and others, 1984).

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

Comment (Deposit): Other Comments = See also: Agostino - ARDF number AN109 and Jewell - ARDF number AN107.

Comment (Geology): Age = Tertiary or younger

References

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

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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