The Inaccessible Ridge is a copper and barium-barite 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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Inaccessible Ridge MRDS details
Site Name
Primary: Inaccessible Ridge
Commodity
Primary: Copper
Primary: Barium-Barite
Location
State: Alaska
District: Noatak
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
Alteration Type: L
Alteration Text: Iron and copper staining
Rocks
Name: Chert
Role: Host
Age Type: Host Rock
Age Young: Late Triassic
Analytical Data
Not available
Materials
Ore: Barite
Ore: Malachite
Comments
Comment (Reference): Primary Reference = Churkin and others (1978)
Comment (Workings): Workings / Exploration = Contains 700 to more than 5000 ppm Ba (Churkin and others, 1978, p.20, 30-31).
Comment (Geology): Geologic Description = Malachite stains on fractures and marcasite nodules in tightly folded Triassic chert; yellow clay partings in chert near contact between intensely folded and faulted Lisburne Group and Siksikpuk Formation.
Comment (Deposit): Model Name = Lode; stratiform
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Mississippian (barite)
References
Reference (Deposit): Cobb, E.H., Mayfield, C.F., and Brosge, W.P., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in eleven quadrangles in northern Alaska (Arctic, Baird Mountains, Chandler Lake, DeLong Mountains, Demarcation Point, Howard Pass, Misheguk Mountain, Mount Michelson, Noatak, Point Lay, and Table Mountain); Supplement to Open-File Report 75-628; Part A, Summaries of data to January 1, 1981: U.S. Geological Survey Open-File Report 81-767-A, 25 p.
Reference (Deposit): Churkin, M. Jr., Mayfield, C.F., Theobald, P.K., Barton, H., Nodleberg, W.J., Winkler, G.R., and Huie, C., 1978, Geological and geochemical appraisal of metallic mineral resources, southern National Petroleum Reserve in Alaska: U.S. Geological Survey Open-File Report 78-70A, 82 p.
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