Unnamed (near Post Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SO
Quadrangle map, 1:63,360-scale D-5
Latitude 64.971
Longitude -164.017
Nearby scientific data Find additional scientific data near this location
Location and accuracy Post Creek is a small north tributary to the Niukluk River. The mouth of Post Creek is about 13 miles from Council. This is locality 11 of Cobb (1972, MF 445; 1978, OF 78-181) who shows this prospect to be on the south side of upper Post Creek in the northwest corner of the Solomon D-4 quadrangle. Gamble (1988, locality 89) shows this prospect to be located on the north side of the Niukluk River, 0.5 mile downstream of the mouth of Post Creek in the Solomon D-5 quadrangle. It is the location of Gamble (1988) that is used here.

Geologic setting

Geologic description

There is an early report of a gold-bearing, 8-foot-wide quartz vein localized at a schist/marble contact 0.5 mile southeast of Post Creek (Smith, 1907). Crushing and panning of the quartz indicated that it could contain as much as 1.7 ounces of gold per ton. Bedrock in the Post Creek drainage is mostly a pelitic schist of possible Cambrian or Precambrian age (Till and others, 1986). This quartz vein is probably the same age as some other gold-quartz veins of southern Seward Peninsula. The southern Seward Peninsula lode gold deposits formed as a result of mid-Cretaceous metamorphism (Apodoca, 1994; Ford, 1993, Ford and Snee, 1996; Goldfarb and others, 1997) that accompanied regional extension (Miller and Hudson, 1991) and crustal melting (Hudson, 1994). This higher temperature metamorphism was superimposed on high pressure/low temperature metamorphic rocks of the region.
Geologic map unit (-164.019625503578, 64.9702668989961)
Mineral deposit model Gold-quartz vein in metamorphic rocks?; low sulfide-Au quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a?
Age of mineralization Cretaceous?
Alteration of deposit Silicification.

Production and reserves

Indication of production None

References

MRDS Number A012633

References

Apodoca, L.E., 1994, Genesis of lode gold deposits of the Rock Creek area, Nome mining district, Seward Peninsula, Alaska: Boulder, Colorado, University of Colorado, Ph.D. dissertation, 208 p.
Ford, R.C., 1993, Geology, geochemistry, and age of gold lodes at Bluff and Mt. Distin, Seward Peninsula, Alaska: Golden, Colorado School of Mines, Ph.D. dissertation, 302 p.
Ford, R.C., and Snee, L.W., 1996, 40Ar/39Ar thermochronology of white mica from the Nome district, Alaska--The first ages of lode sources to placer gold deposits in the Seward Peninsula: Economic Geology, v. 91, p. 213-220.
Goldfarb, R.J., Miller, L.D., Leach, D.L., and Snee, L.W, 1997, Gold deposits in metamorphic rocks in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 151-190.
Hudson, T.L., 1994, Crustal melting events in Alaska, in Plafker, G., and Berg, H. C., eds., The Geology of Alaska: Geological Society of America, DNAG, The Geology of North America, Vol. G-1, p. 657-670.
Reporters Travis L. Hudson (Applied Geology)
Last report date 8/19/1999