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  3. Alaska Resource Data File (ARDF)

Unnamed (south of Little Eldorado Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Zn
Other commodities Hg
Gangue minerals quartz; sericite

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale A-4
Latitude 62.17327
Longitude -157.96951
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a low saddle west of the head of Little Eldorado Creek at an elevation of about 1,050 feet. It is about 0.7 mile north-northwest of hill 1533 and about 0.3 mile north-northwest of the center of section 18, T. 24 N., R. 47 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is a zone of sericitized granite porphyry that contains quartz veinlets with envelopes of iron-stained alteration. The small granite porphyry body cuts sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). A grab sample of mineralization contained 240 parts per million (ppm) zinc and 1,800 parts per billion (ppb) mercury (McGimsey and others, 1988).
Geologic map unit (-157.971917354679, 62.172580688139)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit Sericitic alteration of granite porphyry; veinlets have envelopes of iron oxide alteration.

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys 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 5/25/2003