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  3. Mineral Resource Data System (MRDS)

Banner

Prospect in Alaska, United States with commodities Silver, Gold, 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. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10000676
MRDS ID A011300
Record type Site
Current site name Banner

Geographic coordinates

Geographic coordinates: -149.62283, 63.23152 (WGS84)
Relative position The Banner prospect is at an elevation of about 2,600 feet, about 1.1 mile southwest of the confluence of Bryn Mawr Creek and the West Fork of Chulitna River. It is in SE1/4 sec. 27, T. 19 S., R. 10 W., of the Fairbanks Meridian. The location is accurate to within 1,000 feet. This is locality 2-3 of Hawley and Clark (1974).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

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

Healy S(quadrangle 1:100,000 scale)

Healy(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Chulitna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore
Quartz Gangue
Sericite Gangue

Alteration

  • (Local) Pyrite-quartz-sericite veins overprint earlier skarn calc-silicate assemblages that consist of epidote, pyroxene, actinolite, and occasional garnet.

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8
Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type
    Rock unit name An apophysis of the porphyry plug at the Golden Zone mine.
    Stratigraphic age (youngest) Late Cretaceous
    Chronological age 67.5
  • Host or associated Host
    Rock type
    Stratigraphic age (youngest) Tertiary

Nearby scientific data

(1) -149.62283, 63.23152
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = In the area of the Banner prospect, the northeast-trending Banner fault separates unaltered Triassic sedimentary rocks on the southeast from strongly altered Triassic conglomerate, hornfels, and marble on the northwest. The altered rocks are cut by skarn zones extending 500 feet from the fault zone. The deposit consists of sulfide-bearing skarn and quartz-sericite veins that cut the skarn. Sulfides in the skarn zones vary in content, but average about 10%. They consist of arsenopyrite, pyrrhotite, pyrite, chalcopyrite (unpublished report by Addwest Minerals International Ltd., 1997). Copper content ranges up to 1% and gold values run 0.4 to 1 ounce per ton. The Banner skarn deposit probably is related to an apophysis of the Upper Cretaceous (70-65 Ma) porphyry plug at the Golden Zone mine (HE043).
  • Age = The skarns are probably related to an apophysis of the Upper Cretaceous (70-65 Ma) porphyry plug at the Golden Zone mine (HE043). The quartz-sericite veins may be Tertiary.
  • Age = Chron age is for the Golden Zone mine.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Active

Mining district

District name Valdez Creek

Comments on the workings information

  • Workings / Exploration = Workings consist of surface trenches and two holes drilled to a maximum depth of 300 feet. Copper content ranges up to 1% and gold values run 0.4 to 1 ounce per ton.

Reference information

Bibliographic references

  • Deposit

    Hawley, C.C., and Clark, A.L., 1974, Geology and mineral deposits of the upper Chulitna district, Alaska: U.S. Geological Survey Professional Paper 758-B, p. 1-47, 2 sheets, scale 1:12,000 and 1:48,000.

  • Deposit

    Hawley, C.C., and others, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska. Contract No. JO166107: U.S. Bureau of Mines Open-File Report 24-78, 274 p., 12 sheets.

Comments on the references

  • Primary Reference = Hawley and Clark, 1974

General comments

Subject category Comment text
Deposit Model Name = Cu skarn and polymetallic veins (Cox and Singer, 1986; models 18b, 22c)
Deposit Model Number = 18b, 22c

Reporter information

Type Date Name Affiliation Comment
Reporter 07-APR-2000 N. Van Wyck Stevens Exploration Management Corporation

Beyond USGS

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

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.