Greisen (on Tin Creek)

The Greisen (on Tin Creek) is a tin mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Greisen (on Tin Creek)

Commodity

Primary: Tin
Secondary: Copper
Secondary: Lead
Secondary: Zinc
Secondary: Silver

Location

State: Alaska
District: Port Clarence

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Sn greisen

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: 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.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Cassiterite
Gangue: Mica
Gangue: Tourmaline
Gangue: Topaz
Gangue: Quartz
Gangue: Fluorite

Comments

Comment (Reserve-Resource): Reserves = Not defined

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

Comment (Geology): 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).

Comment (Geology): 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).

Comment (Reference): Primary Reference = Hudson, 1983.

Comment (Exploration): Status = Inactive

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

References

Reference (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.

Reference (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).

Reference (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.

Reference (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.

Reference (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.

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