The Unnamed (shoreline of Sylburn Harbor) is a lead, gold, 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
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 (shoreline of Sylburn Harbor) MRDS details
Site Name
Primary: Unnamed (shoreline of Sylburn Harbor)
Commodity
Primary: Lead
Primary: Gold
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: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Local sericitization of trondhjemite.
Rocks
Name: Granite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Silurian
Name: Granite
Role: Associated
Age Type: Associated Rock
Age Young: Late Silurian
Analytical Data
Not available
Materials
Ore: Galena
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Workings): Workings / Exploration = A grab sample of the sulfide-bearing vein assayed 1.38 oz. Au/ton and 0.42 oz. Ag/ton (Berg, 1972).
Comment (Geology): Geologic Description = The country rock at this site is locally sheared and sericitized Silurian trondhjemite that was regionally metamorphosed to greenschist grade in Late Cretaceous time (Berg, 1972). The occurrence consists of galena in a thin, discontinuous, calcite-quartz fissure vein in a subhorizontal shear zone up to 20 feet thick and several hundred feet long. A grab sample of the sulfide-bearing vein assayed 1.38 oz. Au/ton and 0.42 oz. Ag/ton.
Comment (Deposit): Model Name = Polymetallic veins? (Cox and Singer, 1986; model 22c)
Comment (Geology): Age = The fissure vein probably is Late Cretaceous or younger in age.
Comment (Reference): Primary Reference = Berg, 1972 (I 684)
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): Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.
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.
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.
