Unnamed (east shore of Port Moller)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au; Cu; Pb
Ore minerals gold; pyrite

Geographic location

Quadrangle map, 1:250,000-scale PM
Quadrangle map, 1:63,360-scale D-1
Latitude 55.783
Longitude -160.266
Nearby scientific data Find additional scientific data near this location
Location and accuracy The map site of this occurrence is located on the Alaska Peninsula on the east shore of Right Head on Port Moller (Berg and Cobb, 1967, locality 4; Cobb, 1972 [MF 433], locality 1; MacKevett and Holloway, 1977, locality 1; Wilson and others, 1988, locality 1). It is in the NW1/4 of sec. 3, T. 51 S., R. 71 W., of the Seward Meridian. The location is accurate to 1,200 feet.

Geologic setting

Geologic description

Rocks at this site consist of undivided Tertiary volcanic strata (Wilson and others, 1995). Atwood (1911) first described this occurrence as a series of basaltic lava flows that are altered to a brillant yellow color. His samples contained no gold. Trujillo and others (1982) mention intrusive plugs or stocks. They describe the rocks as heavily pyritized and they found gold in pan concentrates in six drainages. The rock samples they collected contained no gold. Mapping in the 1980s by the U.S. Geological Survey indicated a series of andesite flows and lahars whose basal units are hydrothermally altered (Wilson and others, 1988). Their rock geochemical samples locally contained anomalous amounts of lead and copper.
Geologic map unit (-160.268023034132, 55.7821836692912)
Age of mineralization Tertiary.
Alteration of deposit The brillant yellow color described by Atwood (1911) is probably due to the weathering of pyrite, producing iron oxides and clay.

Production and reserves

Workings or exploration Some staking was carried out here in the early 1900s, but no development work was ever reported. Atwood took some samples in 1911. Resource Associates of Alaska sampled here in 1982, and the U.S. Geological Survey mapped and sampled the area in the mid-1980s.
Indication of production None

Additional comments

This site is located near the boundary between land selected by the Aleut Corporation and State-selected wildlife, park, forest, or other multiple-use areas.

References

MRDS Number A013196

References

Trujillo, R.S., Tapper, C.J., Alvarez, T.J., Porterfield, Ben, and Toupe, W.M., 1982, Exploration and evaluation of precious metal potential of portions of Aleut Corporation lands, southwest Alaska 1982: Resource Associates of Alaska unpublished report, 91 p, 33 maps, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reporters S.H. Pilcher
Last report date 12/22/2000