Bahrenberg

Past Producer in Alaska, United States with commodities Gold, Silver, Lead, Zinc

Geologic information

Identification information

Deposit ID 10000981
MRDS ID A011653
Record type Site
Current site name Bahrenberg
Alternate or previous names Treasure Box, Hottentot

Geographic coordinates

Geographic coordinates: -149.10068, 61.0526 (WGS84)
Relative position Mine located at the headwaters of Crow Creek, north of Jewel Mountain. Marked with an adit symbol on the Anchorage A-6, 1:63,360-scale topographic map. Accurate within 400 ft. Locality 52 of Cobb (1972) and location 41 of MacKevett and Holloway (1977).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Silver Primary
Lead Secondary
Zinc Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Silver Ore
Sphalerite Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) The intrusive rocks have undergone argillic alteration.

Mineral occurrence model information

Model code 274
USGS model code 36a.1
Deposit model name Low-sulfide Au-quartz vein, Chugach-type
Mark3 model number 26

Nearby scientific data

(1) -149.10068, 61.0526

Comments on the geologic information

  • 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).
  • Age = Tertiary or younger

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Anchorage

Comments on the production information

  • 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).

Comments on the reserve resource information

  • Reserves = Reserves are about 344 tons (Jansons and others, 1984).

Comments on the workings information

  • 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).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011653
USGS Alaska Resource Data File ARDF AN110

Bibliographic references

  • 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.

  • Deposit

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

  • 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.

  • 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.

  • 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.

  • Deposit

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

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Park, 1933

General comments

Subject category Comment text
Deposit Model Name = Chugach-type low-sulfide Au-quartz veins (Bliss, 1992; model 36a.1)
Deposit Other Comments = This site orginally called the Treasure Box claim.

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff U.S. Geological Survey
Reporter 30-JUL-1998 S.W. Huss U.S. Geological Survey