Unnamed (on south side of First Chance Creek valley)

The Unnamed (on south side of First Chance Creek valley) 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: Unnamed (on south side of First Chance Creek valley)

Commodity

Primary: Tin

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: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Sn veins
Model Name: Sn veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Oxidation and clay development have been noted in the felsic dike.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Cassiterite

Comments

Comment (Deposit): Model Number = Not a strong analog to deposit models; possibly tin veins, model 15b

Comment (Reserve-Resource): Reserves = Not defined, identified grades are low

Comment (Workings): Workings / Exploration = A 175 foot-long dozer trench crosscuts a 100 foot-wide felsic dike at one location. Detrital cassiterite mapping has been completed in the First Chance Creek drainage (Mulligan, 1966).

Comment (Geology): Geologic Description = Felsic dikes to 100 feet wide cross cut Mississippian marble (Sainsbury, 1972) on the low divide between First Chance and Sarah Creeks (Mulligan, 1966, p. 22). Detrital cassiterite mapping suggests that the area containing the dikes is a source of at least some of the placer cassiterite recovered from First Chance Creek (Mulligan, 1966, p. 21). A 175 foot-long dozer trench was opened across one of these dikes. Composite samples from this trench all indicate low but anomalous tin concentrations of 0.01 to 0.06 % (Mulligan, 1966, p. 31). The sample descriptions suggest that the dike is altered, primarily near its contacts where oxidation and clay development is noted. Marine transgressions may have influenced the lower pay streak on nearby Cape Creek (Hudson and Reed, 1997, p. 451-452) and possibly First Chance Creek (TE007). This lode occurrence is at an elevation of 200 feet which is above the highest level of marine deposits that are known in Cape Creek. (TE006). However, this occurrence is located on a marine terrace surface that has a shoreline angle elevation of about 500 feet in this area. The degree to which this higher sea level stand may have influenced the distribution of detrital cassiterite in the First Chance and Cape Creek areas is not known.

Comment (Reference): Primary Reference = Mulligan, 1966

Comment (Geology): Age = Late Cretaceous; tin metallization in the Cape Mountain area is interpreted to be linked to evolution of the Cape Mountain biotite granite that has been determined to be 78.8 +/- 2.9 my by the K/Ar method (Hudson and Arth, 1983, p. 769).

Comment (Exploration): Status = Inactive

Comment (Deposit): Model Name = Lode tin occurrence (generally related to tin vein model of Cox and Singer, 1986; model 15b)

References

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): Sainsbury, C.L., 1972, Geologic map of the Teller quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Map I-685, 4 p., 1 sheet, scale 1:250,000.

Reference (Deposit): Mulligan, J.J., 1966, Tin-lode investigations, Cape Mountain area, Seward Peninsula, Alaska; with a section on petrography by W. L. Gnagy: U.S. Bureau of Mines Report of Investigations 6737, 43 p.

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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