Unnamed (along Summit Creek)

The Unnamed (along Summit Creek) is a silver, zinc, gold, and barium-barite 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 (along Summit Creek)

Commodity

Primary: Silver
Primary: Zinc
Primary: Gold
Primary: Barium-Barite
Secondary: Bismuth

Location

State: Alaska
District: Juneau (Skagway subdistrict)

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

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Role: Host
Age Type: Host Rock
Age in Years: 33.000000+-1.000000
Age Young: Tertiary

Role: Host
Age Type: Host Rock
Age in Years: 29.300000+-1.000000
Age Young: Tertiary

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Pyrrhotite
Ore: Pyrite
Ore: Galena
Ore: Chalcopyrite
Gangue: Quartz
Gangue: Calcite

Comments

Comment (Geology): Geologic Description = According to Still and others (1991), 'Bedrock in the area consists predominately of slate and phyllite, limy slate, and minor limestone.' Stream sediment samples from the mouth of Summit Creek and from small springs near the head of Summit Creek contained up to 0.020 ppm gold, 1.2 ppm silver, 1,620 ppm zinc, 1,950 ppm barium, and 660 ppm bismuth (sheet 1, numbers 209 to 217 and F83 to F90 of Gilbert and others, 1991). Still and others (1991) also report that bedrock and float samples were collected at scattered locations along Summit Creek . Quartz-calcite-sulfide float samples from talus slopes and moraine contained up to 0.686 ppm gold, 380.9 ppm silver, 2.5% zinc, 700 ppm copper, and 4.1% lead. A stream sediment sample from below a spring surrounded by iron-stained gossan contained 1.9% zinc, and a sample of iron-stained calcite-cemented slate collected several hundred feet below this stream-sediment sample contained 1.2 % zinc. The calcite cement precipitated from the spring water contains sphalerite. Virtually the entire drainage of Summit Creek consists of slate (MacKevett and others, 1974). The Triassic or Devonian age of this unit, the Porcupine Slate (Redman and others, 1985; Gilbert and others, 1987), establishes a maximum age for the mineralization. Mineralization contained in cemented scree, ferricrete, and spring water precipitates is very young if not Recent but descriptions of float samples (Still and others, 1991) also suggest that the quartz-sulfide veins are probably of Tertiary age based on the 29.3 + 1 to 33.0 + 1 m.y. age of nearby intrusive bodies (Gilbert and others, 1987).

Comment (Exploration): Status = Probably inactive

Comment (Geology): Age = the Devonian or Triassic age of the Porcupine Slate (Redman and others, 1984; Gilbert and others, 1987) establishes a maximum age for the mineralization. The veins are of probable Tertiary based on the 29.3 + 1 to 33.0 + 1 m.y. age of nearby intrusive bodies (Gilbert and others, 1987). Mineralization in ferricrete, scree cement , and spring- water precipitates is very young to Recent (Still and others, 1991).

Comment (Geology): Age = Chronological age is for nearby intrusive bodies. Host rock is Triassic - Devonian.

Comment (Reference): Primary Reference = Still and others, 1991

References

Reference (Deposit): Still, J.C., Hoekzema, R.B., Bundtzen, T.K., Gilbert, W.G., Wier, K.R., Burns, L.E., and Fechner, S.A., 1991, Economic geology of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-4, 156 p., 5 sheets, scale 1:63,360.

Reference (Deposit): Gilbert, W.G., Still, J.C., Burns, L.E., Wier, K.R., and Redman, E.C., 1991, Geochemistry of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-5, 1 sheet, scale 1:63,360, 75 p.

Reference (Deposit): Redman, E.C., Retherford, R.M., and Hickok, B.D., 1984, Geology and geochemistry of the Skagway B-2 Quadrangle, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 84-31, 34 p., 4 sheets, scale 1:40,000.

Reference (Deposit): Gilbert, W.G., Burns, L.E., Redman, E.C., and Forbes, R.B., 1987, Preliminary bedrock geology and geochemistry of the Skagway B-3 Quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 87-2, 2 sheets, scale 1:36,200.

Reference (Deposit): MacKevett, E.M., Jr., Robertson, E.C., and Winkler, G.R., 1974, Geology of the Skagway B-3 and B-4 quadrangles, southern Alaska: U.S. Geological Survey Professional Paper 832, 33 p.

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