The Unnamed (near Round Point) is a zinc, 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
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Unnamed (near Round Point) MRDS details
Site Name
Primary: Unnamed (near Round Point)
Commodity
Primary: Zinc
Primary: Lead
Primary: Copper
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: Massive sulfide, kuroko
Model Name: Massive sulfide, Sierran kuroko
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Pyrite
Ore: Chalcopyrite
Comments
Comment (Production): Production Notes = None
Comment (Reserve-Resource): Reserves = None
Comment (Reference): Primary Reference = Grybeck, Berg, and Karl, 1984
Comment (Workings): Workings / Exploration = Site was originally defined in 1984 by Grybeck, Berg, and Karl on the basis of a brief visit to an industry exploration camp nearby. However, exploration was more widespread than just the occurrence that the USGS visited and there may have been some drilling on the property. However, there is little indication that major surface exploration continued in this area much beyond the mid-80's, although the area may well have been further examined by industry since.
Comment (Deposit): Model Name = Kuroko volcanogenic massive-sulfide deposit (Cox and Singer, 1986; model 28a); alternatively a Sierran Kuroko volcanogenic massive sulfide deposit (Bliss, 1992; model 28a1)
Comment (Geology): Age = Probably Triassic.
Comment (Geology): Geologic Description = The mineralized exposure consists of rusty-weathering, light green-gray felsic metavolcanic rocks with small lenses, pods, and layers up to a foot thick that contain disseminated sulfides, mainly pyrite and possibly sphalerite and chalcopyrite. Analyses of grab samples show less than 5 ppm Cu, 50-150 ppm Pb, 200-11,000 Zn, and 150-5,000 Ba. The felsic metavolcanic rocks are interbedded with light gray, silicified limestone and dark gray argillite. Recent geologic mapping in the area (S. Karl, oral communication, 1998) indicates that the rocks in which the sulfides occurs are probably part of the Triassic Hyd Group. The site marked the southern end of the Duncan Canal-Zarembo belt of Triassic volcanogenic massive-sulfide mineralization as originally defined by Berg and Grybeck in 1980.
References
Reference (Deposit): Grybeck, D.J., Berg, H.C., and Karl, S.M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000.
Reference (Deposit): Berg, H. C., and Grybeck, Donald, 1980, Upper Triassic volcanogenic Zn-Pb-Ag (-Cu-Au) mineral deposits near Petersburg, Alaska: U.S. Geological Survey Open-File Report 80-527, 11 p., 1 oversize sheet.
The Top Ten Gold Producing States
These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.
