The Nanjan is a molybdenum 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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Nanjan MRDS details
Site Name
Primary: Nanjan
Commodity
Primary: Molybdenum
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: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Molybdenite
Gangue: Quartz
Comments
Comment (Deposit): Other Comments = the prospect is in Misty Fiords National Monument Wilderness.
Comment (Deposit): Model Name = Polymetallic vein? (Cox and Singer, 1986; model 22c)
Comment (Geology): Age = Late Cretaceous or younger
Comment (Reference): Primary Reference = Maas and others, 1995
Comment (Workings): Workings / Exploration = Molybdenite mineralization was discovered at the Nanjan property in about 1935, Workings in the 1930s included trenches, opencuts, test pits, and shafts, but little of the work was evident in 1992 (Maas and others, 1995). Samples collected by Maas and others (1995, p. 269) along the Nanjan vein revealed low precious- and base-metal values. The highest molybdenum analysis was 0.25% Mo in a selected sample, and 0.20% Mo across a 4-foot-wide section of the vein.
Comment (Geology): Geologic Description = The Nanjan prospect area is underlain by an assemblage of undivided Mesozoic or Paleozoic metamorphosed sedimentary, volcanic, and intrusive rocks; and by a stock and dikes of Cretaceous granodiorite and quartz diorite (Berg and others, 1988, p. 21, 22). The undivided assemblage was regionally metamorphosed to amphibolite grade in middle or Late Cretaceous Cretaceous time, and locally remetamorphosed to hornblende hornfels near the contacts of some of the granodiorite and quartz diorite plutons. The prospect is situated on a prominent high-angle fault of unknown displacement that strikes north-northwest, along the valley of the unnamed creek that adjoins the property (Maas and others, 1995, fig. 70). The Nanjan prospect consists of sparse nodules of pyrite and molybdenite in a quartz fissure vein that reportedly lies near the contact of hornblende granite and altered limestone (Maas and others, 1995, p. 268). The vein strikes between N40W and N20E and dips generally to the west. the vein is up to 8 feet thick, but probably averages less than 3 feet thick; it is exposed intermittently along strike for at least 1300 feet. Most of the molybdenite is associated with fault gouge that bounds the vein. The vein apparently is younger than most or all of the middle or Late Cretaceous regional metamorphism, but older than an episode of local(?) faulting. Molybdenite mineralization was discovered at the Nanjan property in about 1935, Workings in the 1930s included trenches, opencuts, test pits, and shafts, but little of the work was evident in 1992 (Maas and others, 1995). Samples collected by Maas and others (1995, p. 269) along the Nanjan vein revealed low precious- and base-metal values. The highest molybdenum analysis was 0.25% Mo in a selected sample, and 0.20% Mo across a 4-foot-wide section of the vein.
References
Reference (Deposit): Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.
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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