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Inaccessible Ridge

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ba; Cu
Ore minerals barite; malachite

Geographic location

Quadrangle map, 1:250,000-scale MU
Quadrangle map, 1:63,360-scale B-5
Latitude 68.47
Longitude -161.85
Nearby scientific data Find additional scientific data near this location
Location and accuracy Location plotted is Inaccessible Ridge locality of Churkin and others (1978, fig. 3); on continuation of Inaccessible Ridge on southwest side of westernmost fork at head of Kagvik Creek and about 0.5 mi (0.8 km) northeast of hill 3770; within 2 mi (3.2 km).

Geologic setting

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.
Geologic map unit (-161.853010139928, 68.4693769517089)
Mineral deposit model Lode; stratiform
Age of mineralization Mississippian (barite)
Alteration of deposit Iron and copper staining.

Production and reserves

Workings or exploration Contains 700 to more than 5000 ppm Ba (Churkin and others, 1978, p. 20, 30-31).
Indication of production None

References

MRDS Number A015677

References

Churkin, M., Jr., Mayfield, C.F., Theobald, P.K., Barton, Harlan, Nokleberg, W.J., Winkler, G.R., and Huie, Carl, 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., 6 sheets, scale 1:500,000.
Reporters M.T. Powers; D.F. Huber; J.M. Schmidt
Last report date 10/22/1992