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Unnamed (north of South Fork of Otter Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities As
Other commodities Hg
Gangue minerals carbonate minerals; quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale C-4
Latitude 62.52302
Longitude -157.63125
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 1,500 feet, north of the center of the South Fork of Otter Creek. The occurrence is about 0.3 mile west of hill 2039 in about the center of the north boundary of section 16, T. 28 N., R. 45 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is an altered zone in an intermediate to mafic dike that cuts calcareous sandstone of the Upper Cretaceous Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The dike has been altered to silica-carbonate rock. One grab sample contained 470 parts per million (ppm) arsenic and 820 parts per billion (ppb) mercury (McGimsey and others, 1988).
Geologic map unit (-157.633636864854, 62.5223375445194)
Alteration of deposit Silica-carbonate alteration of mafic dike.

Production and reserves

Workings or exploration Surface samples were collected by the Alaska Division of Geological and Geophysical Surveys and the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Indication of production None

References

References

McGimsey, R.G., Miller, M.L., and Arbogast, B.F., 1988, Paper version of analytical results, and sample locality map for rock samples from the Iditarod quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-421-A, 110 p., 1 sheet, scale 1:250,000.
Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major oxide, trace element, fossil, paleocurrent, and archeological sample localities: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-A, 48 pages; 1 sheet, scale 1:250,000.
Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)
Last report date 5/19/2003