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Ivotuk Hills

Occurrence, Inactive

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Commodities and mineralogy

Main commodities P; U; V
Ore minerals apatite

Geographic location

Quadrangle map, 1:250,000-scale KL
Latitude 68.48
Longitude -155.71
Nearby scientific data Find additional scientific data near this location
Location and accuracy Location is at west end of Ivotuk Hills, 100 m from Otuk Creek. Known to within one mile.

Geologic setting

Geologic description

A 1.2 m-thick sequence of interbedded phosphatic pelletal limestone and shale of the Otuk Formation is exposed on the north side of the Ivotuk Hills. The limestone beds have lenses that average approximately 78 mm thick and comprise up to 50% of the 1.2 m-thick section. This occurrence is unique because rocks with such high phosphate content are not common in the Otuk Formation. The Lisburne Ridge phosphate occurrence, 47 km to the northwest may be an extension of the Ivotuk phosphorites.
Geologic map unit (-155.712926396679, 68.4795150888507)
Mineral deposit model Bedded phosphorite
Mineral deposit model number 34c

Production and reserves

Workings or exploration Geochemical analysis showed the phosphatic limestone contained 30.7% P2O5, 0.11% V, and 150 ppm U.
Indication of production None

References

MRDS Number A106134

References

Kurtak, J.M., Meyer, M.P., Hicks, R.W., Werdon, M.B., 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., 1 sheet, scale 1:250,000.
Reporters K.D. Kelley
Last report date 2/7/1997