The Cobblestone Creek is a manganese 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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Cobblestone Creek MRDS details
Site Name
Primary: Cobblestone Creek
Commodity
Primary: Manganese
Location
State: Alaska
District: Colville
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
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Not available
Comments
Comment (Reference): Primary Reference = Kurtak and others, 1995, USBM OFR 8-95
Comment (Workings): Workings / Exploration = Samples with iron-manganese staining contain up to 11.7% Mn.
Comment (Geology): Geologic Description = Shale and silty mudstone of the Torok Formation are exposed along Cobblestone Creek; greenish-brown mudstone and shale locally display intense manganese staining. Siderite is abundant, but there were no specific manganese minerals identified.
Comment (Deposit): Model Name = Sedimentary manganese
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Cretaceous
References
Reference (Deposit): Barnwell, C.E., Simpson, S., and Church, S.E., 1989, Analytical results and sample locality maps of stream-sediment and rock samples from the Cobblestone Creek area, southeastern Chandler Lake quadrangle, Alaska: U.S. Geological Survey Open-file Report 89-540, 38 p.
Reference (Deposit): Meyer, M.P., 1994, Analytical results from U.S. Bureau of Mines investigations in the Colville Mining District, Alaska: U.S. Bureau of Mines Open-File Report 34-94, 137 p.
Reference (Deposit): Kurtak, J.M., Hicks, R.W., Werdon, M.B., Meyer, M.P., and Mull, C.G., 1995, Mineral investigations in the Colville mining district and southern National Petroleum Reserve in Alaska: U.S. Bureau of Mines Open-File Report 8-95, 217 p.
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