The Lost Zarembo 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
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Lost Zarembo MRDS details
Site Name
Primary: Lost Zarembo
Commodity
Primary: Zinc
Primary: Lead
Primary: 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: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Massive sulfide, Sierran kuroko
Model Name: Massive sulfide, kuroko
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Outcrop is iron-stained, probably from weathering of sulfides.
Rocks
Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene
Analytical Data
Not available
Materials
Ore: Chalcopyrite
Ore: Galena
Ore: Pyrite
Ore: Sphalerite
Comments
Comment (Geology): Geologic Description = The deposit as described by Grybeck, Berg, and Karl (1984) consists of three, massive sulfide layers in orange-weathering, greenish-gray metarhyolite along the west wall of the quarry. The most prominent exposure of the sulfides is a 4-foot-thick layer that crops out for about 50 feet and is truncated at both ends by faults. Selected portions of the massive sulfide layers contain up to 30% sulfides, mainly sphalerite, accompanied by minor pyrite, chalcopyrite, and galena, in a fine-grained siliceous matrix. Analyses of selected grab samples contain up to 0.55 ppm Au, about 8% Zn, 0.25% Pb, 0.39% Cu, 30 ppm or less Ag, and up to 5000 ppm Ba. The occurrence forms a wedge-shaped, fault-bounded outcrop about 30 by 100 feet in size in size that abuts steeply-dipping Tertiary basalt, diabase, and rhyolite dikes. As now exposed, the massive sulfide deposit is not very large and the quarry is dominated by the various steeply dipping Tertiary dikes. The association of massive sulfides interbedded with metarhyolite suggests that this occurrence is part of the Duncan Canal-Zarembo belt of dismembered, Upper Triassic volcanogenic massive sulfide deposits described by Berg and Grybeck (1980) and Berg (1981).
Comment (Production): Production Notes = None
Comment (Exploration): Status = Inactive
Comment (Reference): Primary Reference = Grybeck, Berg, and Karl, 1984
Comment (Workings): Workings / Exploration = Originally found by the USGS in the late 70's. Revisited by the USGS in 1996 (D.J. Grybeck); little had changed except for signs that others had collected samples there.
Comment (Commodity): Gangue = Silica matrix.
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 a segment of the dismembered, Upper Triassic Duncan-Zarembo volcanogenic mineral belt defined by Berg and Grybeck (1980) and Berg (1981).
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.
Reference (Deposit): Berg, H.C., 1981, Upper Triassic volcanogenic massive sulfide metallogenic province identified in southeastern Alaska, in Albert, N.R.D., and Hudson, T.L., eds., The United States Geological Survey in Alaska: accomplishments during 1979: U.S. Geological Survey Circular 823-B, p. B104-B108.
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