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Montana

Occurrence, Inactive

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Alternative names

Montana Bog Iron

Commodities and mineralogy

Main commodities Fe
Ore minerals limonite; other hydrous iron minerals

Geographic location

Quadrangle map, 1:250,000-scale TL
Quadrangle map, 1:63,360-scale A-1
Latitude 62.07
Longitude -150.04
Nearby scientific data Find additional scientific data near this location
Location and accuracy Reed and others (1978, locality 65) locate this site in the drainage basin of Goose Creek, about 1.3 miles southeast of Montana, Alaska, in Section 20, T. 23 N., R. 4 W., of the Seward Meridian.

Geologic setting

Geologic description

Bog iron is currently forming a deposit about 50 feet in diameter, up to 8 feet thick, composed of limonite and probably other hydrous iron minerals (Berg and Cobb, 1967). The highest tenor reported is 41.2% Fe.
Geologic map unit (-150.04224649566, 62.0694825494815)
Mineral deposit model Cox and Singer (1986) and Bliss (1992) do not include an ore deposit model for this type of occurrence.
Age of mineralization Recent.

Production and reserves

Workings or exploration Surface sampling is all that has been done here (Berg and Cobb, 1967). The highest tenor reported is 41.2% Fe.
Indication of production None

Additional comments

This area is not large enough to be of economic interest; however, the area has not been prospected for similar, perhaps larger, deposits which may be present. This occurrence may be no more significant than the numerous unreported occurrences of this type occur throughout Alaska.

References

MRDS Number A011552

References

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Clark, A.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-369, 1 sheet, scale 1:250,000.
Cobb, E.H., and Reed, B.L., 1980, Summaries of data on and lists of reference to metallic and selected nonmetallic mineral deposits in the Talkeetna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-884, 106 p.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Reed, B.L., Nelson, S.W., Curtin, G.C., and Singer, D.A., 1978, Mineral resources map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-870-D, 1 sheet, scale 1:250,000.
Reporters Madelyn A. Millholland (Millholland & Associates)
Last report date 8/10/1998