Hidden Dike

The Hidden Dike 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: Hidden Dike

Commodity

Primary: Tin
Secondary: Lead
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 skarn
Model Name: Sn greisen
Model Name: Sn veins
Model Name: Replacement Sn

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Calc-silicate tactite is well developed in carbonate rocks bordering the Hidden dike. The dike itself is variably replaced by tourmaline but large parts are unaltered. The border of the dike appears to have localized irregular solution breccias.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Galena
Ore: Cassiterite
Gangue: Tourmaline
Gangue: Quartz
Gangue: Pyrrhotite

Comments

Comment (Reserve-Resource): Reserves = Not defined

Comment (Workings): Workings / Exploration = Only limited surface observations and sampling have been completed here.

Comment (Deposit): Model Name = Altered quartz porphyry dike in tactite. Deposit analog is not clear; possibly tin vein model (15b), or at depth, tin skarn, replacement, or greisen models(14b, 14c, and 15c) after Cox and Singer (1986).

Comment (Deposit): Model Number = 14b, 14c, 15b, 15c

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 (Geology): Geologic Description = The Hidden dike is a felsic quartz porphyry that is bordered by layered tactite developed in Ordovician limestone. The contact with tactite is irregular, brecciated, and locally strongly altered. Tourmaline, galena, and pyrrhotite are present in the more strongly altered rocks. Two samples of tourmalized quartz porphyry contained 1.4 and 3.2% tin, 2.9 and 4.45% lead, and 1.1 and 2.9 opt silver. The layered tactite was only weakly anomalous in tin (to 110 ppm) and other elements (Hudson, 1983). . This prospect, the Dalcoath dike prospect 0.75 mile to the east (TE052), the extensive tactite development at lower elevations of the ridge where the Hidden and Dalcoath dikes are located, and an apparently related magnetic anomaly (McDermott, 1983) suggests the possibility of a tin mineralizing system at depth in this general area (Hudson, 1983). The surface dikes are not believed to be directly responsible for the nearby tactite development.

Comment (Reference): Primary Reference = Hudson, 1983

Comment (Exploration): Status = Inactive

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

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): McDermott, M.M., 1983, Investigation of the magnetic contact aureoles of the Khotol and Black Mountain granites, Alaska: Anchorage, Alaska, Anaconda Minerals Company internal report (Report held by Cook Inlet Region, Inc., Anchorage, Alaska).

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