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Unnamed (northwest of Clearwater Creek near peak 6630)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-6
Latitude 63.2242
Longitude -146.9498
Nearby scientific data Find additional scientific data near this location
Location and accuracy This mineral occurrence is at an elevation of about 6,300 feet on a steep northwest-trending ridge about 1.5 miles northwest of Clearwater Creek. It is about a quarter of a mile west of peak 6630 in the NW1/4 section 24, T. 19 S., R. 4 E., Fairbanks Meridian. The location is probably accurate within a quarter of a mile. The occurrence corresponds to locality 9 in table 2 of Nokleberg and others (1991).

Geologic setting

Geologic description

The rock at this occurrence is a biotite-chlorite-garnet schist, possibly a skarn, in a roof pendant in the East Susitna batholith of Cretaceous age (Nokleberg and others, 1982, 1991). The occurrence is near a regional thrust fault.
The garnetiferous schist is pyritic; a grab sample contained almost 0.5 ounce (15 parts per million) of silver per ton (Nokleberg and others, 1991, locality 9, table 2). The silver-bearing mineral is unknown.
Geologic map unit (-146.952065902861, 63.2237573639877)
Mineral deposit model Pyritic garnetiferous skarn?
Age of mineralization Probably Cretaceous, the age of the granitic intrusion near the site.
Alteration of deposit Contact (?) metamorphism; skarn formation.

Production and reserves

Workings or exploration There are no workings at the occurrence.
Indication of production None

References

References

Nokleberg, W.J., Albert, N.R.D., Bond, G.C., Herzon, P.L., Miyaoka, R.T., Nelson, W.H., Richter, D.H., Smith T.E., Stout, J.H., Yeend, Warren, and Zehner, R.E., 1982, Geologic map of the southern Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 82-52, 27 p., 1 sheet,scale 1:250,000.
Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
Reporters W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date 7/31/2001