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Unnamed (northeast of Solsmunket Lake)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities W
Other commodities REE; Th; U
Ore minerals thorite; uranothorianite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SH
Quadrangle map, 1:63,360-scale A-1
Latitude 66.11
Longitude -156.02
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 2,000 feet, in the saddle of a ridge 3 miles northeast of Solsmunket Lake. The map site is in section 12, T. 8 N., R. 13E., of the Kateel River Meridian. Cobb (1972, MF-448), location 12.

Geologic setting

Geologic description

This occurrence consists of a tungsten-bearing quartz vein, and of radioactive minerals, in monzonite (Miller and Ferrians, 1968). The quartz vein is 1 to 3 feet wide. It assayed 7,000 ppm W, but no tungsten mineral was noted. Samples of monzonite from the border facies of the Cretaceous Zane Hills pluton, which is mainly granodiorite, contained 14 to 33 ppm U and 75 to 199 ppm Th. The radioactivity apparently is mainly in uranothorianite, thorite, betafite, allanite, zircon and sphene.
Geologic map unit (-156.022646040186, 66.1094343299285)
Mineral deposit model Tungsten-bearing quartz vein and disseminated radioactive minerals in monzonite.
Age of mineralization Cretaceous.

Production and reserves

Workings or exploration Site visited and sampled by U.S. Geological Survey (Miller and Ferrians, 1968).
Indication of production None

References

MRDS Number A015600

References

Cobb, E.H., 1972, Metallic mineral resources map of the Shungnak quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-448, 1 sheet, scale 1:250,000.
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in five quadrangles in west central Alaska (Hughes, Kotzebue, Melozitna, Selawik, Shungnak): U.S. Geological Survey Open-File Report 75-627, 58 p.
Cobb, E.H., and Miller, T.P., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Hughes, Kotzebue, Melozitna, Selawik and Shungnak quadrangles, west-central Alaska; Supplement to Open-File Report 75-627; Part A, Summaries to January 1, 1981: U.S. Geological Survey Open-File Report 81-847-A, 14 p.
Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 sheet, scale 1:1,000,000.
Grybeck, Donald, 1977, Map showing known mineral deposits of the Brooks Range, Alaska: U.S. Geological Survey Open-File Report 77-166-C, 45 p., 1 sheet, scale 1:1,000,000.
Miller, T.P., and Ferrians, O.J., Jr., 1968, Suggested areas for prospecting in the central Koyukuk River region, Alaska: U.S. Geological Survey Circular 570, 12 p.
Reporters Anita Williams (Anchorage, AK)
Last report date 12/16/1999