The Unnamed (near Spine Mountain) is a copper and silver 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 Spine Mountain) MRDS details
Site Name
Primary: Unnamed (near Spine Mountain)
Commodity
Primary: Copper
Primary: 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
Model Name: Low-sulfide Au-quartz vein
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Country rocks are pyritized.
Rocks
Role: Host
Age Type: Host Rock
Age Young: Cretaceous
Age Old: Late Jurassic
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Chalcopyrite
Comments
Comment (Geology): Geologic Description = The country rocks in the area of this site are Upper Jurassic or Cretaceous flyschlike metasedimentary rocks that are gradationally interbedded with subordinate andesitic or basaltic metatuff (Berg, 1972 [I 684]; Berg and others, 1988; Karl, 1992). The area also contains small, generally fault-bounded, outcrop areas of recrystallized Upper Triassic basalt and limestone. The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrence consists of augite-porphyritic, Jurassic or Cretaceous, metatuff (greenstone) containing about five percent of disseminated sulfides, mainly pyrite and chalcopyrite (Karl, 1992). The greenstone is cut by quartz veins up to about 2 feet thick. A sample of the greenstone contained 3 ppm Ag, 200 ppm Cu, 100 ppm Co, 150 ppm Cr, and 150 ppm Ni (Karl, 1992, loc. 13).
Comment (Workings): Workings / Exploration = A sample of the greenstone contained 3 ppm Ag, 200 ppm Cu, 100 ppm Co, 150 ppm Cr, and 150 ppm Ni (Karl, 1992, loc. 13).
Comment (Deposit): Model Name = In part, possibly low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a); in part, disseminated sulfide deposit of volcanogenic? origin.
Comment (Geology): Age = Disseminated sulfide mineralization may in part be cogenetic with Upper Jurassic or Cretaceous deposition of the metatuff (greenstone) hostrock. Fissure veins probably are Late Cretaceous or younger.
Comment (Reference): Primary Reference = Karl, 1992
References
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.
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,
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