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Brenner

Prospect in Alaska, United States with commodities Gold, Molybdenum, Lead, Zinc, Copper
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10000986
MRDS ID A011657
Record type Site
Current site name Brenner
Related records 10258434

Geographic coordinates

Geographic coordinates: -149.11762, 61.04454 (WGS84)
Relative position 500 ft south-southwest of the end of the unimproved road which follows Crow Creek, west of Barnes Mountain. Marked with prospect symbol the Anchorage A-6 1:63,360-scale topographic map. Accurate within 400 ft. Locality 5 on plate 33 of Park (1933), locality 53 of Cobb (1972), locality 42 of MacKevett and Holloway (1977), and locality A-40 of Jansons and others (1984).

Site location context

Political divisions (FIPS codes)

Anchorage(Municipality)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Anchorage A-6(quadrangle 1:63,360 scale)

Anchorage SW(quadrangle 1:100,000 scale)

Anchorage(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Anchorage(hydrologic unit)

Knik Arm(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Chugach National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Molybdenum Primary
Lead Primary
Zinc Critical Primary
Copper Secondary

Comments on the commodity information

  • Ore Material = Copper (native)

Materials information

Materials Type of material
Arsenopyrite Ore
Galena Ore
Gold Ore
Marcasite Ore
Molybdenite Ore
Pyrite Ore
Pyrrhotite Ore
Sphalerite Ore
Copper Ore
Calcite Gangue
Quartz Gangue

Alteration

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

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) -149.11762, 61.04454
ListMap

Economic information

Comments on the geologic information

  • 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.
  • Age = Tertiary or younger

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Anchorage

Comments on the reserve resource information

  • Reserves = Reported to have moderate mineral development potential for a small mine (Jansons and others, 1984).

Comments on the workings information

  • 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.

Reference information

Bibliographic references

  • 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

    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.

  • 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.

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 = See also: Agostino - ARDF number AN109 and Jewell - ARDF number AN107.

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.