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Lower Specimen Creek

Prospect, Active

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Commodities and mineralogy

Main commodities Au
Other commodities Pt
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-5
Latitude 63.2787
Longitude -146.0526
Nearby scientific data Find additional scientific data near this location
Location and accuracy This placer prospect is at an elevation of about 3,350 feet on lower Specimen Creek. The location is for the approximate midpoint of the placer prospect, in the SE1/4SE1/4 section 8, T. 19 S., R. 9 E., Fairbanks Meridian (W.T. Ellis, oral communication, 1998).

Geologic setting

Geologic description

Alluvium in lower Specimen Creek contains 0.02 to 0.04 ounce of gold per cubic yard and traces of platinum. The gold averages about 35 mesh and is finer than 16 mesh (James Adler, written communication, 2001, on the basis of test work by Richard Hughes, P.E.). The source of the gold is unknown, but mineralized rocks (see MH125, MH137-MH139) occur upstream in the Slana Spur Formation of Late Paleozoic age, which is intruded by gabbro and ultramafic rock of Late Triassic age (Nokleberg and others, 1991).
Geologic map unit (-146.05485931282, 63.2782791832608)
Mineral deposit model Placer Au-PGE (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Holocene.

Production and reserves

Workings or exploration
Three test pits were hand-dug in 1986. The results of the tests indicate that alluvium contains 0.02 to 0.04 ounce of gold and a trace of platinum per cubic yard. In 1998, several back-hoe test pits were dug and sampled (W.T. Ellis, oral communication, 1998).
On-Line Exploration staked 15 claims on the placer in 1993.
Indication of production None

References

References

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 6/19/2001