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Unnamed occurrence (Inmachuk River)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Pb
Ore minerals galena
Gangue minerals limonite; magnetite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale BN
Quadrangle map, 1:63,360-scale D-3
Latitude 65.9
Longitude -163.3
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is supposed to be on the left limit of the Inmachuk River, on the ridge between Inmachuk River and Collins Creek. The location is very approximate and unconfirmed. It is locality 6 of Cobb (1972; MF 417; 1975; OFR 75-429).

Geologic setting

Geologic description

Mertie (1919) described a sample said to be from this occurrence as containing galena, magnetite, limonite, and pyrite. The galena was supposedly argentiferous. The gossanous character of the occurrence was reported by Anderson (1947), but its location and nature have not been confirmed. Bedrock of the area is a metasedimentary schist and marble sequence of Lower Paleozoic age (Till and others, 1986).
Geologic map unit (-163.302702272489, 65.8993027708669)
Mineral deposit model Galena in metasedimentary rocks; epigenetic?; stratiform?
Age of mineralization Unknown
Alteration of deposit A gossanous, limonitic cap is reportedly developed.

Production and reserves

Workings or exploration Anderson (1947) reports that some development work has taken place; surface prospecting pits are most likely.
Indication of production None

Additional comments

All references to this site are from secondary sources and the site was not visited by USGS personnel during 1982 field work in the area.

References

MRDS Number A012724

References

Anderson, Eskil, 1947, Mineral occurrences other than gold deposits in northwestern Alaska: Alaska Territorial Division of Mines Pamphlet 5-R, 48 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Bendeleben quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-417, 1 sheet, scale 1:250,000.
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bendeleben quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-429, 123 p.
Mertie, J.B., Jr., 1918, Lode mining and prospecting on Seward Peninsula, in Brooks, A.H., and others, Mineral resources of Alaska, report on progress of investigations in 1916: U.S. Geological Survey Bulletin 662, p. 425-449.
Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.
Reporters Travis L. Hudson (Applied Geology)
Last report date 3/15/1999