The Unnamed (near Red Mountain) is a lead and copper 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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Unnamed (near Red Mountain) MRDS details
Site Name
Primary: Unnamed (near Red Mountain)
Commodity
Primary: Lead
Primary: Copper
Secondary: Silver
Location
State: Alaska
District: Ketchikan
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
Alteration Type: L
Alteration Text: Sulfidization of country rocks.
Rocks
Role: Host
Age Type: Host Rock
Age Young: Cretaceous
Age Old: Late Jurassic
Analytical Data
Not available
Materials
Ore: Pyrrhotite
Ore: Pyrite
Ore: Galena
Ore: Chalcopyrite
Comments
Comment (Deposit): Model Name = Disseminated sulfide deposit of volcanogenic origin?
Comment (Geology): Age = Disseminated sulfide mineralization may in part be cogenetic with Late Jurassic or Cretaceous deposition of volcanic-sedimentary hostrocks.
Comment (Reference): Primary Reference = Karl, 1992
Comment (Geology): Geologic Description = The country rocks in the area of Red Mountain are Upper Jurassic or Cretaceous andesitic or basaltic metavolcanic rocks that are gradationally interbedded with subordinate flyschlike metasedimentary rocks (Berg, 1972 [I 684]; Berg and others, 1988). The bedded rocks are intruded by a Jurassic or Cretaceous diorite stock and related dikes. The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrences consist of ubiquitously disseminated pyrite and pyrrhotite in metadiorite, argillite, metagraywacke, and metatuff (Karl, 1992, loc. 4a-f). The sulfides commonly make up as much as 10 volume percent, and locally up to 40 volume percent, of the hostrocks. In places, a little galena or chalcopyrite accompany the other sulfides. . A sample of augite crystal metatuff contained 1.5 ppm Ag; samples of the metadiorite contained up to 700 ppm Cu and 100 ppm Pb; a sample of slate contained 10 ppm Mo; and samples of phyllitic gritstone and sandstone contained up to 200 ppm Pb (Karl, 1992, loc. 4a-f). The distribution and setting of the disseminated sulfide mineralization suggest that it may in part be cogenetic with Late Jurassic or Cretaceous deposition of the volcanic-sedimentary hostrocks.
Comment (Workings): Workings / Exploration = A sample of augite crystal metatuff contained 1.5 ppm Ag; samples of the metadiorite contained up to 700 ppm Cu and 100 ppm Pb; a sample of slate contained 10 ppm Mo; and samples of phyllitic gritstone and sandstone contained up to 200 ppm Pb (Karl, 1992, loc. 4a-f).
References
Reference (Deposit): Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360,
Reference (Deposit): Karl, S.M., 1992, Map and table of mineral deposits on Annette Island, Alaska: U.S. Geological Survey Open-File Report 92-690, 57 p., 1 map, scale 1:63,360.
Reference (Deposit): Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map MF-1807,27 p., scale 1:250,000.
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