The Zimmerman (near junction of Twin and Pedro Creeks) is a 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
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Zimmerman (near junction of Twin and Pedro Creeks) MRDS details
Site Name
Primary: Zimmerman (near junction of Twin and Pedro Creeks)
Commodity
Primary: Gold
Location
State: Alaska
District: Fairbanks
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
Not available
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: The schist in the vicinity of the Zimmerman prospect is silicifed, and some schist fragments carry a peculiar greenish-yellow stain (Hill, 1933).
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Arsenopyrite
Ore: Gold
Comments
Comment (Reference): Primary Reference = Hill, 1933
Comment (Workings): Workings / Exploration = Surface samples were taken from a hydraulic cut (Hill, 1933).
Comment (Deposit): Model Name = Auriferous, silicified schist.
Comment (Exploration): Status = Inactive
Comment (Geology): Geologic Description = Hill (1933) visited the site and the following geologic description is a summary of his observations. Extensive exposures of mineralized quartz diorite and schist occur in a hydraulic cut on the Zimmerman property. Near the southwest or lower end of the cut, a fault zone strikes east and dips 85 N. The fault zone consists of 11 feet of blue clay gouge that contains a large amount of fragmental quartz and silicified schist. Some of the fragments contain arsenopyrite and have a peculiar greenish-yellow stain. A few samples from a 3-foot zone of silicified mineralized schist contained as much as 0.08 ounces of gold per ton.? Northeast of the gouge, the rock is quartz diorite. For seven feet above the fault, the diorite is badly crushed, but farther to the northeast, it is less altered, breaks in blocky forms, and is cut by several minor fault fractures that strike from west to N 60 W. Southwest of the main fault, the rock is highly silicified schist with many quartz veinlets and everywhere contains a small amount of finely disseminated arsenopyrite. The rock is bluish gray, hard, and heavier than the nomal quartz-mica schist. For at least 70 feet south of the main fault, this rock is broken and crushed, and there are several well-defined slip planes that vary in strike from N 70 W to west and dip north, all roughly parallel to the main fault.? the samples of the altered quartz diorite north of the fault contained neither gold nor silver. The silicified mineralized schist south of the fault carried only a trace of precious metals except for a few samples from a 3-foot zone that contained as much as 0.08 ounces of gold per ton. The gold-bearing samples contained notable sulfides (Hill, 1933, p. 118-119).
References
Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Livengood quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-413, 2 sheets, scale 1:250,000.
Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-633, 72 p.
Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Livengood quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-819, 241 p.
Reference (Deposit): Chapman, R.M., and Foster, R.L., 1969, Lode mines and prospects in the Fairbanks district, Alaska: U.S. Geological Survey Professional Paper 625-D, 25 p., 1 plate.
Reference (Deposit): Hill, J.M., 1933, Lode deposits of the Fairbanks District, Alaska: U.S. Geological Survey Bulletin 849-B, p. 29-163.
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