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
Elevation:
Commodity: Silver, Zinc, Gold, Barium-Barite
Lat, Long: 59.33, -136.12000
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Unnamed (along Summit Creek) MRDS details
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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