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Greisen (on Tin Creek)

Prospect in Alaska, United States with commodities Tin, Silver, Copper, Lead, Zinc
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Geologic information

Identification information

Deposit ID 10308407
Record type Site
Current site name Greisen (on Tin Creek)

Geographic coordinates

Geographic coordinates: -167.1244, 65.46527 (WGS84)
Relative position Tin Creek is an east tributary to Lost River whose confluence is located 4.5 miles upstream from the mouth of Lost River on the Bering Sea. The Gresien prospect is in the eastern part of the Tin Creek granite stock, a rounded hill in the headwaters of Tin Creek (Sainsbury, 1969). This rounded hill, between Tin Creek and its small north tributary, reaches elevations of just over 1,150 feet. This locality 10 of Cobb and Sainsbury (1972). Cobb (1975) summarized relevant references under the name 'Tin Cr., trib. Lost R.'.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Tin Primary
Silver Secondary
Copper Secondary
Lead Secondary
Zinc Secondary

Materials information

Materials Type of material
Cassiterite Ore
Fluorite Gangue
Quartz Gangue
Topaz Gangue
Tourmaline Gangue
Mica Gangue

Alteration

  • (Local) Typical greisen alteration with feldspar destruction and extensive replacement by quartz, topaz, and white mica in the host granite. Some quartz veining may be present in the cores of greisen zones. Tourmaline and fluorite are also present in altered rocks. Alteration selvages are less completely greisenized granite.

Mineral occurrence model information

Model code 49
USGS model code 15c
Deposit model name Sn greisen

Nearby scientific data

(1) -167.1244, 65.46527
ListMap

Comments on the geologic information

  • Geologic Description = The headwaters of Tin Creek are in an area where a small stock of biotite granite, the Tin Creek stock (Sainsbury, 1969; Hudson and Arth, 1983) intrudes Orovician limestone and dolomite. The Tin Creek stock covers a 1,000 by 2,000 foot area on the crest of the rounded hill between Tin Creek and its northern tributary. The south contact of the stock is irregular and includes granite offshoots, dikes, and apophyses in the bordering carbonate rocks. An eastern part of the Tin Creek granite stock is cut by parallel greisen sheets with peripheral alteration selvages. Seven samples of this greisen (Hudson, 1983) contained 525 to 3,020 ppm tin, 1,040 ppm to 1.7% lead, 8,400 to greater than 20,000 ppm fluorine, 550 to greater than 1,000 ppm arsenic, and 5 to 24 ppm silver. Copper (to 280 ppm) and zinc (to 3,630 ppm) are elevated in some of these samples and gold (5 ppb) was detected in four. The style of mineralization here is interpreted to be similar to that at depth in the Lost River Mine endogreisen prospect (TE050).
  • Age = the age of the mineralization is assumed to be related to the development of tin systems in the Lost River area and therefore Late Cretaceous, the age of the tin-mineralizing granites there (Hudson and Arth, 1983).

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Port Clarence

Comments on the reserve resource information

  • Reserves = Not defined

Comments on the workings information

  • Workings / Exploration = Little exploration has taken place here but some surface trenches or pits may be present.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF TE043

Bibliographic references

  • Deposit

    Cobb, E.H., and Sainsbury, C.L., 1972, Metallic mineral resource map of the Teller quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-426, 1 sheet, scale 1:250,000.

  • Deposit

    Hudson, T.L., and Arth, J. G., 1983, Tin-granites of Seward Peninsula, Alaska: Geological Society of America Bulletin, v. 94, p. 768-790.

  • Deposit

    Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Teller quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-587, 130 p.

  • Deposit

    Hudson, T.L., 1983, Interim report on the Lost River district, Seward Peninsula, Alaska: Anchorage, Alaska, Anaconda Minerals Company internal report (Report held by Cook Inlet Region, Inc., Anchorage, Alaska).

  • Deposit

    Sainsbury, C.L., 1969, Geology and ore deposits of the central York Mountains, western Seward Peninsula, Alaska: U.S. Geological Survey Bulletin 1287, 101 p.

Comments on the references

  • Primary Reference = Hudson, 1983.

General comments

Subject category Comment text
Deposit Model Name = Tin greisen (Cox and Singer, 1986, model 15c)

Reporter information

Type Date Name Affiliation Comment
Reporter 10-MAY-98 Travis L. Hudson Applied Geology