The Berg Basin is a zinc, lead, silver, and gold 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
Elevation:
Commodity: Zinc, Lead, Silver, Gold
Lat, Long: 56.44611, -132.01000
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Berg Basin MRDS details
Site Name
Primary: Berg Basin
Commodity
Primary: Zinc
Primary: Lead
Primary: Silver
Primary: Gold
Secondary: Copper
Location
State: Alaska
District: Petersburg
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: Gold
Ore: Chalcopyrite
Ore: Galena
Ore: Pyrite
Ore: Sphalerite
Gangue: Quartz
Comments
Comment (Reserve-Resource): Reserves = None
Comment (Workings): Workings / Exploration = Discovered in 1907. Explored by several surface pits, a tunnel about 800 feet long, and several hundred feet of diamond drilling in 1947-1948. Fowler (1950) indicates that seven men were working at the property then but apparently there has been no work since.
Comment (Production): Production Notes = Probably none
Comment (Reference): Primary Reference = Gault and others, 1953
Comment (Deposit): Model Name = Polymetallic veins? (Cox and Singer, 1986; model 22c)
Comment (Geology): Geologic Description = The country rocks in the area of this prospect are biotite schist and subordinate marble and calcsilicate rocks that are intruded by Eocene tonalite and granodiorite and by younger dikes and sills of rhyolite, basalt, and pegmatite (Brew and others, 1984). ? the deposit consists of a stockwork of quartz veinlets carrying pyrite, galena, and sphalerite, and of sporadic small masses of sphalerite and galena (Gault and others, 1953). Some of the veins contain moderate values of gold and silver. The small sulfide masses occur in a composite basaltic dike, in thin breccia zones along the contacts of basalt and rhyolite dikes and sills, along contacts of basalt dikes with schist near rhyolite, and disseminated in the rhyolite. One diamond drill hole intersected 5 feet of solid and disseminated galena. No galena or sphalerite have been found except where basaltic dikes are associated with rhyolite sills and dikes. The galena contains up to 28 ounces of silver per ton. A quartz vein reported to carry about 0.68 ounces of gold per ton crops out at the surface but could not be found in the underground workings. ? the Berg Basin prospect is along the southern extension of the belt that includes the deposits in Glacier Basin (PE041) and Groundhog Basin (PE040) to the north.
Comment (Commodity): Ore Material = Gold (native)
Comment (Geology): Age = The age of the deposit is inferred to be mid-Cenozoic, based on its spatial and apparently genetic association with dikes and sills that cut the Eocene tonalite.
References
Reference (Deposit): Fowler, H.M., 1950, Report of investigations in the Hyder, Ketchikan, Wrangell, Petersburg, Juneau, Sitka, and Skagway precincts: Alaska Territorial Department of Mines Itinerary Report 195-6, 29 p.
Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Petersburg quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-870, 53 p.
Reference (Deposit): Chapin, Theodore, 1918, Mining developments in the Ketchikan and Wrangell mining districts: U.S. Geological Survey Bulletin 662-B, p. 63-75.
Reference (Deposit): Buddington, A.F., 1923, Mineral deposits of the Wrangell district; U.S. Geological Survey Bulletin 739, p. 51-75.
Reference (Deposit): Gault, H.R., Rossman, D.L., Flint, G.M., Jr., and Ray, R.G., 1953, Some lead-zinc deposits of the Wrangell district, Alaska: U.S. Geological Survey Bulletin 998-B, p. 15-58.
Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Petersburg quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-415, 1 sheet, scale 1:250,000.
Reference (Deposit): Brew, D. A., Ovenshine, A. T., Karl, S. M., and Hunt, S. J., 1984, Preliminary reconnaissance geologic map of the Petersburg and parts of the Port Alexander and Sumdum 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 84-405, 43 p., 2 sheets, scale 1:250,000.
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.
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