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  3. Mineral Resource Data System (MRDS)

Unnamed (north of Cape Darby)

Occurrence in Alaska, United States with commodities Silver, Lead, Tin
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Alteration
  7. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308307
Record type Site
Current site name Unnamed (north of Cape Darby)

Geographic coordinates

Geographic coordinates: -162.80222, 64.39834 (WGS84)
Relative position This occurrence is on the west coast of the Darby Peninsula; 2.3 miles south of Golovin Mission, 5.1 miles north of Cape Darby, and 1 mile north of ARDF locality SO001. It is locality 67 of Gamble (1988).

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Solomon B-2 NW(quadrangle 1:24,000 scale)

Solomon SE(quadrangle 1:100,000 scale)

Solomon(quadrangle 1:250,000 scale)

Federal lands

Golovin Native Corporation(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Lead Primary
Tin Critical Primary

Alteration

  • (Local) The nature of the alteration in the 5-foot-wide fault zone here is not described.

Host and associated rocks

  • Host or associated Associated
    Rock type
    Rock unit name Darby
    Stratigraphic age (youngest) Early Cretaceous
    Chronological age 92.8
    Dating method K-Ar
    Stratigraphic age (youngest) Early Cretaceous
    Chronological age 88.3
    Dating method K-Ar

Nearby scientific data

(1) PzPxkg
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = A highly altered, 5-foot-wide fault zone cuts intrusive rocks of the Darby pluton at this location. A grab sample from the altered fault zone contained 50 ppm Ag, 30,000 ppm As, 300 ppm Pb, and 500 ppm Zn (Miller and Grybeck, 1973). The gold concentration was not determined in this sample. The Darby pluton is a composite mid-Cretaceous granodiorite and granite (Miller and others, 1972; Till and others, 1986); K/Ar ages for the Darby pluton are 88.3 +/- 1.5 and 92.8 +/- 2.6 Ma (Berry and others, 1976).
  • Age = Not known. K/Ar ages for the Darby pluton are 88.3 +/- 1.5 and 92.8 +/- 2.6 Ma (Berry and others, 1976); this occurrence is younger.
  • Age = Chronological age is for the Darby pluton. This occurrence is younger.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Council

Comments on the workings information

  • Workings / Exploration = There are no known workings; exploration in the region may have included reconnaissance stream sediment geochemical and radiometric surveys.

Reference information

Bibliographic references

  • Deposit

    Miller, T.P., Grybeck, D.J., Elliott, R.L., and Hudson, T.L., 1972, Preliminary geologic map of the eastern Solomon and southeastern Bendeleben quadrangles, eastern Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 72-256, 11 p.

  • Deposit

    Miller, T.P., and Grybeck, D.J., 1973, Geochemical survey of the eastern Solomon and southeastern Bendeleben quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 553, 115 p.

  • Deposit

    Berry, A.L., Dalrymple, G.B., Lamphere, M.A., and Von Essen, J.C., 1976, Summary of miscellaneous potassium-argon age determinations, U. S. Geological Survey, Menlo Park, California, for the years 1972-1974: U.S. Geological Survey Circular 727, 13 p.

  • Deposit

    Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.

  • Deposit

    Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Miller and Grybeck, 1973

General comments

Subject category Comment text
Deposit Model Name = Altered fault zone in granitic rocks with Ag, As, Pb, and Zn values.

Reporter information

Type Date Name Affiliation Comment
Reporter 19-AUG-99 Travis L. Hudson Applied Geology

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.